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-'\"
-'\" Copyright (c) 1992-1994 The Regents of the University of California.
-'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
-'\" Copyright (c) 1997-1999 Scriptics Corporation.
-'\"
-'\" See the file "license.terms" for information on usage and redistribution
-'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-'\"
-.TH canvas n 8.3 Tk "Tk Built-In Commands"
-.so man.macros
-.BS
-'\" Note:  do not modify the .SH NAME line immediately below!
-.SH NAME
-canvas \- Create and manipulate 'canvas' hypergraphics drawing surface widgets
-.SH SYNOPSIS
-\fBcanvas\fR \fIpathName \fR?\fIoptions\fR?
-.SO
-\-background	\-borderwidth	\-cursor
-\-highlightbackground	\-highlightcolor	\-highlightthickness
-\-insertbackground	\-insertborderwidth	\-insertofftime
-\-insertontime	\-insertwidth	\-relief
-\-selectbackground	\-selectborderwidth	\-selectforeground
-\-takefocus	\-xscrollcommand	\-yscrollcommand
-.SE
-.SH "WIDGET-SPECIFIC OPTIONS"
-.OP \-closeenough closeEnough CloseEnough
-Specifies a floating-point value indicating how close the mouse cursor
-must be to an item before it is considered to be
-.QW inside
-the item. Defaults to 1.0.
-.OP \-confine confine Confine
-Specifies a boolean value that indicates whether or not it should be
-allowable to set the canvas's view outside the region defined by the
-\fBscrollRegion\fR argument.
-Defaults to true, which means that the view will
-be constrained within the scroll region.
-.OP \-height height Height
-Specifies a desired window height that the canvas widget should request from
-its geometry manager. The value may be specified in any
-of the forms described in the \fBCOORDINATES\fR section below.
-.OP \-scrollregion scrollRegion ScrollRegion
-Specifies a list with four coordinates describing the left, top, right, and
-bottom coordinates of a rectangular region.
-This region is used for scrolling purposes and is considered to be
-the boundary of the information in the canvas.
-Each of the coordinates may be specified
-in any of the forms given in the \fBCOORDINATES\fR section below.
-.OP \-state state State
-Modifies the default state of the canvas where \fIstate\fR may be set to
-one of: \fBnormal\fR, \fBdisabled\fR, or \fBhidden\fR. Individual canvas
-objects all have their own state option which may override the default
-state. Many options can take separate specifications such that the
-appearance of the item can be different in different situations. The
-options that start with \fBactive\fR control the appearance when the mouse
-pointer is over it, while the option starting with \fBdisabled\fR controls
-the appearance when the state is disabled. Canvas items which are
-\fBdisabled\fR will not react to canvas bindings.
-.OP \-width width width
-Specifies a desired window width that the canvas widget should request from
-its geometry manager. The value may be specified in any
-of the forms described in the \fBCOORDINATES\fR section below.
-.OP \-xscrollincrement xScrollIncrement ScrollIncrement
-Specifies an increment for horizontal scrolling, in any of the usual forms
-permitted for screen distances. If the value of this option is greater
-than zero, the horizontal view in the window will be constrained so that
-the canvas x coordinate at the left edge of the window is always an even
-multiple of \fBxScrollIncrement\fR; furthermore, the units for scrolling
-(e.g., the change in view when the left and right arrows of a scrollbar
-are selected) will also be \fBxScrollIncrement\fR. If the value of
-this option is less than or equal to zero, then horizontal scrolling
-is unconstrained.
-.OP \-yscrollincrement yScrollIncrement ScrollIncrement
-Specifies an increment for vertical scrolling, in any of the usual forms
-permitted for screen distances. If the value of this option is greater
-than zero, the vertical view in the window will be constrained so that
-the canvas y coordinate at the top edge of the window is always an even
-multiple of \fByScrollIncrement\fR; furthermore, the units for scrolling
-(e.g., the change in view when the top and bottom arrows of a scrollbar
-are selected) will also be \fByScrollIncrement\fR. If the value of
-this option is less than or equal to zero, then vertical scrolling
-is unconstrained.
-.BE
-.SH INTRODUCTION
-.PP
-The \fBcanvas\fR command creates a new window (given
-by the \fIpathName\fR argument) and makes it into a canvas widget.
-Additional options, described above, may be specified on the
-command line or in the option database
-to configure aspects of the canvas such as its colors and 3-D relief.
-The \fBcanvas\fR command returns its
-\fIpathName\fR argument. At the time this command is invoked,
-there must not exist a window named \fIpathName\fR, but
-\fIpathName\fR's parent must exist.
-.PP
-Canvas widgets implement structured graphics.
-A canvas displays any number of \fIitems\fR, which may be things like
-rectangles, circles, lines, and text.
-Items may be manipulated (e.g. moved or re-colored) and commands may
-be associated with items in much the same way that the \fBbind\fR
-command allows commands to be bound to widgets. For example,
-a particular command may be associated with the <Button-1> event
-so that the command is invoked whenever button 1 is pressed with
-the mouse cursor over an item.
-This means that items in a canvas can have behaviors defined by
-the Tcl scripts bound to them.
-.SH "DISPLAY LIST"
-.PP
-The items in a canvas are ordered for purposes of display,
-with the first item in the display list being displayed
-first, followed by the next item in the list, and so on.
-Items later in the display list obscure those that are
-earlier in the display list and are sometimes referred to as being
-.QW "on top"
-of earlier items.
-When a new item is created it is placed at the end of the
-display list, on top of everything else.
-Widget commands may be used to re-arrange the order of the
-display list.
-.PP
-Window items are an exception to the above rules. The underlying
-window systems require them always to be drawn on top of other items.
-In addition, the stacking order of window items
-is not affected by any of the canvas widget commands; you must use
-the Tk \fBraise\fR command and \fBlower\fR command instead.
-.SH "ITEM IDS AND TAGS"
-.PP
-Items in a canvas widget may be named in either of two ways:
-by id or by tag.
-Each item has a unique identifying number, which is assigned to
-that item when it is created. The id of an item never changes
-and id numbers are never re-used within the lifetime of a
-canvas widget.
-.PP
-Each item may also have any number of \fItags\fR associated
-with it. A tag is just a string of characters, and it may
-take any form except that of an integer.
-For example,
-.QW x123
-is OK but
-.QW 123
-is not.
-The same tag may be associated with many different items.
-This is commonly done to group items in various interesting
-ways; for example, all selected items might be given the tag
-.QW selected .
-.PP
-The tag \fBall\fR is implicitly associated with every item
-in the canvas; it may be used to invoke operations on
-all the items in the canvas.
-.PP
-The tag \fBcurrent\fR is managed automatically by Tk;
-it applies to the \fIcurrent item\fR, which is the
-topmost item whose drawn area covers the position of
-the mouse cursor (different item types interpret this in varying ways; see the
-individual item type documentation for details).
-If the mouse is not in the canvas widget or is not over
-an item, then no item has the \fBcurrent\fR tag.
-.PP
-When specifying items in canvas widget commands, if the
-specifier is an integer then it is assumed to refer to
-the single item with that id.
-If the specifier is not an integer, then it is assumed to
-refer to all of the items in the canvas that have a tag
-matching the specifier.
-The symbol \fItagOrId\fR is used below to indicate that
-an argument specifies either an id that selects a single
-item or a tag that selects zero or more items.
-.PP
-\fItagOrId\fR may contain a logical expressions of
-tags by using operators:
-.QW \fB&&\fR ,
-.QW \fB||\fR ,
-.QW \fB^\fR ,
-.QW \fB!\fR ,
-and parenthesized subexpressions. For example:
-.CS
-      .c find withtag {(a&&!b)||(!a&&b)}
-.CE
-or equivalently:
-.CS
-      .c find withtag {a^b}
-.CE
-will find only those items with either
-.QW a
-or
-.QW b
-tags, but not both.
-.PP
-Some widget commands only operate on a single item at a
-time; if \fItagOrId\fR is specified in a way that
-names multiple items, then the normal behavior is for
-the command to use the first (lowest) of these items in
-the display list that is suitable for the command.
-Exceptions are noted in the widget command descriptions
-below.
-.SH "COORDINATES"
-.PP
-All coordinates related to canvases are stored as floating-point
-numbers.
-Coordinates and distances are specified in screen units,
-which are floating-point numbers optionally followed
-by one of several letters.
-If no letter is supplied then the distance is in pixels.
-If the letter is \fBm\fR then the distance is in millimeters on
-the screen; if it is \fBc\fR then the distance is in centimeters;
-\fBi\fR means inches, and \fBp\fR means printers points (1/72 inch).
-Larger y-coordinates refer to points lower on the screen; larger
-x-coordinates refer to points farther to the right.
-Coordinates can be specified either as an even number of parameters,
-or as a single list parameter containing an even number of x and y
-coordinate values.
-.SS TRANSFORMATIONS
-.PP
-Normally the origin of the canvas coordinate system is at the
-upper-left corner of the window containing the canvas.
-It is possible to adjust the origin of the canvas
-coordinate system relative to the origin of the window using the
-\fBxview\fR and \fByview\fR widget commands; this is typically used
-for scrolling.
-Canvases do not support scaling or rotation of the canvas coordinate
-system relative to the window coordinate system.
-.PP
-Individual items may be moved or scaled using widget commands
-described below, but they may not be rotated.
-.PP
-Note that the default origin of the canvas's visible area is
-coincident with the origin for the whole window as that makes bindings
-using the mouse position easier to work with; you only need to use the
-\fBcanvasx\fR and \fBcanvasy\fR widget commands if you adjust the
-origin of the visible area. However, this also means that any focus
-ring (as controlled by the \fB\-highlightthickness\fR option) and
-window border (as controlled by the \fB\-borderwidth\fR option) must
-be taken into account before you get to the visible area of the
-canvas.
-.SH "INDICES"
-.PP
-Text items support the notion of an \fIindex\fR for identifying
-particular positions within the item.
-In a similar fashion, line and polygon items support \fIindex\fR for
-identifying, inserting and deleting subsets of their coordinates.
-Indices are used for commands such as inserting or deleting
-a range of characters or coordinates, and setting the insertion
-cursor position. An index may be specified in any of a number
-of ways, and different types of items may support different forms
-for specifying indices.
-Text items support the following forms for an index; if you
-define new types of text-like items, it would be advisable to
-support as many of these forms as practical.
-Note that it is possible to refer to the character just after
-the last one in the text item; this is necessary for such
-tasks as inserting new text at the end of the item.
-Lines and Polygons do not support the insertion cursor
-and the selection. Their indices are supposed to be even
-always, because coordinates always appear in pairs.
-.TP 10
-\fInumber\fR
-.
-A decimal number giving the position of the desired character
-within the text item.
-0 refers to the first character, 1 to the next character, and
-so on. If indexes are odd for lines and polygons, they will be
-automatically decremented by one.
-A number less than 0 is treated as if it were zero, and a
-number greater than the length of the text item is treated
-as if it were equal to the length of the text item. For
-polygons, numbers less than 0 or greater than the length
-of the coordinate list will be adjusted by adding or subtracting
-the length until the result is between zero and the length,
-inclusive.
-.TP 10
-\fBend\fR
-.
-Refers to the character or coordinate just after the last one
-in the item (same as the number of characters or coordinates
-in the item).
-.TP 10
-\fBinsert\fR
-.
-Refers to the character just before which the insertion cursor
-is drawn in this item. Not valid for lines and polygons.
-.TP 10
-\fBsel.first\fR
-.
-Refers to the first selected character in the item.
-If the selection is not in this item then this form is illegal.
-.TP 10
-\fBsel.last\fR
-.
-Refers to the last selected character in the item.
-If the selection is not in this item then this form is illegal.
-.TP 10
-\fB@\fIx,y\fR
-.
-Refers to the character or coordinate at the point given by \fIx\fR and
-\fIy\fR, where \fIx\fR and \fIy\fR are specified in the coordinate
-system of the canvas.
-If \fIx\fR and \fIy\fR lie outside the coordinates covered by the
-text item, then they refer to the first or last character in the
-line that is closest to the given point.
-.SH "DASH PATTERNS"
-.PP
-Many items support the notion of a dash pattern for outlines.
-.PP
-The first possible syntax is a list of integers. Each element
-represents the number of pixels of a line segment. Only the odd
-segments are drawn using the
-.QW outline
-color. The other segments are drawn transparent.
-.PP
-The second possible syntax is a character list containing only
-5 possible characters
-.QW "\fB.,-_ \fR" .
-The space can be used
-to enlarge the space between other line elements, and cannot
-occur as the first position in the string. Some examples:
-.CS
-\-dash .     \(-> \-dash {2 4}
-\-dash -     \(-> \-dash {6 4}
-\-dash -.    \(-> \-dash {6 4 2 4}
-\-dash -..   \(-> \-dash {6 4 2 4 2 4}
-\-dash {. }  \(-> \-dash {2 8}
-\-dash ,     \(-> \-dash {4 4}
-.CE
-.PP
-The main difference of this syntax with the previous is that it
-is shape-conserving. This means that all values in the dash
-list will be multiplied by the line width before display. This
-assures that
-.QW .
-will always be displayed as a dot and
-.QW -
-always as a dash regardless of the line width.
-.PP
-On systems which support only a limited set of dash patterns, the dash
-pattern will be displayed as the closest dash pattern that is available.
-For example, on Windows only the first 4 of the above examples are
-available. The last 2 examples will be displayed identically to the first
-one.
-.SH "WIDGET COMMAND"
-.PP
-The \fBcanvas\fR command creates a new Tcl command whose
-name is \fIpathName\fR. This
-command may be used to invoke various
-operations on the widget. It has the following general form:
-.CS
-\fIpathName option \fR?\fIarg arg ...\fR?
-.CE
-\fIOption\fR and the \fIarg\fRs
-determine the exact behavior of the command.
-The following widget commands are possible for canvas widgets:
-.TP
-\fIpathName \fBaddtag \fItag searchSpec \fR?\fIarg arg ...\fR?
-.
-For each item that meets the constraints specified by
-\fIsearchSpec\fR and the \fIarg\fRs, add
-\fItag\fR to the list of tags associated with the item if it
-is not already present on that list.
-It is possible that no items will satisfy the constraints
-given by \fIsearchSpec\fR and \fIarg\fRs, in which case the
-command has no effect.
-This command returns an empty string as result.
-\fISearchSpec\fR and \fIarg\fR's may take any of the following
-forms:
-.RS
-.TP
-\fBabove \fItagOrId\fR
-.
-Selects the item just after (above) the one given by \fItagOrId\fR
-in the display list.
-If \fItagOrId\fR denotes more than one item, then the last (topmost)
-of these items in the display list is used.
-.TP
-\fBall\fR
-.
-Selects all the items in the canvas.
-.TP
-\fBbelow \fItagOrId\fR
-.
-Selects the item just before (below) the one given by \fItagOrId\fR
-in the display list.
-If \fItagOrId\fR denotes more than one item, then the first (lowest)
-of these items in the display list is used.
-.TP
-\fBclosest \fIx y \fR?\fIhalo\fR? ?\fIstart\fR?
-.
-Selects the item closest to the point given by \fIx\fR and \fIy\fR.
-If more than one item is at the same closest distance (e.g. two
-items overlap the point), then the top-most of these items (the
-last one in the display list) is used.
-If \fIhalo\fR is specified, then it must be a non-negative
-value.
-Any item closer than \fIhalo\fR to the point is considered to
-overlap it.
-The \fIstart\fR argument may be used to step circularly through
-all the closest items.
-If \fIstart\fR is specified, it names an item using a tag or id
-(if by tag, it selects the first item in the display list with
-the given tag).
-Instead of selecting the topmost closest item, this form will
-select the topmost closest item that is below \fIstart\fR in
-the display list; if no such item exists, then the selection
-behaves as if the \fIstart\fR argument had not been specified.
-.TP
-\fBenclosed\fR \fIx1\fR \fIy1\fR \fIx2\fR \fIy2\fR
-.
-Selects all the items completely enclosed within the rectangular
-region given by \fIx1\fR, \fIy1\fR, \fIx2\fR, and \fIy2\fR.
-\fIX1\fR must be no greater than \fIx2\fR and \fIy1\fR must be
-no greater than \fIy2\fR.
-.TP
-\fBoverlapping\fR \fIx1\fR \fIy1\fR \fIx2\fR \fIy2\fR
-.
-Selects all the items that overlap or are enclosed within the
-rectangular region given by \fIx1\fR, \fIy1\fR, \fIx2\fR,
-and \fIy2\fR.
-\fIX1\fR must be no greater than \fIx2\fR and \fIy1\fR must be
-no greater than \fIy2\fR.
-.TP
-\fBwithtag \fItagOrId\fR
-.
-Selects all the items given by \fItagOrId\fR.
-.RE
-.TP
-\fIpathName \fBbbox \fItagOrId\fR ?\fItagOrId tagOrId ...\fR?
-.
-Returns a list with four elements giving an approximate bounding box
-for all the items named by the \fItagOrId\fR arguments.
-The list has the form
-.QW "\fIx1 y1 x2 y2\fR"
-such that the drawn
-areas of all the named elements are within the region bounded by
-\fIx1\fR on the left, \fIx2\fR on the right, \fIy1\fR on the top,
-and \fIy2\fR on the bottom.
-The return value may overestimate the actual bounding box by
-a few pixels.
-If no items match any of the \fItagOrId\fR arguments or if the
-matching items have empty bounding boxes (i.e. they have nothing
-to display)
-then an empty string is returned.
-.TP
-\fIpathName \fBbind \fItagOrId\fR ?\fIsequence\fR? ?\fIcommand\fR?
-.
-This command associates \fIcommand\fR with all the items given by
-\fItagOrId\fR such that whenever the event sequence given by
-\fIsequence\fR occurs for one of the items the command will
-be invoked.
-This widget command is similar to the \fBbind\fR command except that
-it operates on items in a canvas rather than entire widgets.
-See the \fBbind\fR manual entry for complete details
-on the syntax of \fIsequence\fR and the substitutions performed
-on \fIcommand\fR before invoking it.
-If all arguments are specified then a new binding is created, replacing
-any existing binding for the same \fIsequence\fR and \fItagOrId\fR
-(if the first character of \fIcommand\fR is
-.QW +
-then \fIcommand\fR augments an existing binding rather than replacing it).
-In this case the return value is an empty string.
-If \fIcommand\fR is omitted then the command returns the \fIcommand\fR
-associated with \fItagOrId\fR and \fIsequence\fR (an error occurs
-if there is no such binding).
-If both \fIcommand\fR and \fIsequence\fR are omitted then the command
-returns a list of all the sequences for which bindings have been
-defined for \fItagOrId\fR.
-.RS
-.PP
-The only events for which bindings may be specified are those related to
-the mouse and keyboard (such as \fBEnter\fR, \fBLeave\fR,
-\fBButtonPress\fR, \fBMotion\fR, and \fBKeyPress\fR) or virtual events.
-The handling of events in canvases uses the current item defined in
-\fBITEM IDS AND TAGS\fR above. \fBEnter\fR and \fBLeave\fR events
-trigger for an
-item when it becomes the current item or ceases to be the current item;
-note that these events are different than \fBEnter\fR and \fBLeave\fR
-events for windows. Mouse-related events are directed to the current
-item, if any. Keyboard-related events are directed to the focus item, if
-any (see the \fBfocus\fR widget command below for more on this). If a
-virtual event is used in a binding, that binding can trigger only if the
-virtual event is defined by an underlying mouse-related or
-keyboard-related event.
-.PP
-It is possible for multiple bindings to match a particular event.
-This could occur, for example, if one binding is associated with the
-item's id and another is associated with one of the item's tags.
-When this occurs, all of the matching bindings are invoked.
-A binding associated with the \fBall\fR tag is invoked first,
-followed by one binding for each of the item's tags (in order),
-followed by a binding associated with the item's id.
-If there are multiple matching bindings for a single tag,
-then only the most specific binding is invoked.
-A \fBcontinue\fR command in a binding script terminates that
-script, and a \fBbreak\fR command terminates that script
-and skips any remaining scripts for the event, just as for the
-\fBbind\fR command.
-.PP
-If bindings have been created for a canvas window using the \fBbind\fR
-command, then they are invoked in addition to bindings created for
-the canvas's items using the \fBbind\fR widget command.
-The bindings for items will be invoked before any of the bindings
-for the window as a whole.
-.RE
-.TP
-\fIpathName \fBcanvasx \fIscreenx\fR ?\fIgridspacing\fR?
-.
-Given a window x-coordinate in the canvas \fIscreenx\fR, this command returns
-the canvas x-coordinate that is displayed at that location.
-If \fIgridspacing\fR is specified, then the canvas coordinate is
-rounded to the nearest multiple of \fIgridspacing\fR units.
-.TP
-\fIpathName \fBcanvasy \fIscreeny\fR ?\fIgridspacing\fR?
-.
-Given a window y-coordinate in the canvas \fIscreeny\fR this command returns
-the canvas y-coordinate that is displayed at that location.
-If \fIgridspacing\fR is specified, then the canvas coordinate is
-rounded to the nearest multiple of \fIgridspacing\fR units.
-.TP
-\fIpathName \fBcget\fR \fIoption\fR
-.
-Returns the current value of the configuration option given
-by \fIoption\fR.
-\fIOption\fR may have any of the values accepted by the \fBcanvas\fR
-command.
-.TP
-\fIpathName \fBconfigure ?\fIoption\fR? ?\fIvalue\fR? ?\fIoption value ...\fR?
-.
-Query or modify the configuration options of the widget.
-If no \fIoption\fR is specified, returns a list describing all of
-the available options for \fIpathName\fR (see \fBTk_ConfigureInfo\fR for
-information on the format of this list). If \fIoption\fR is specified
-with no \fIvalue\fR, then the command returns a list describing the
-one named option (this list will be identical to the corresponding
-sublist of the value returned if no \fIoption\fR is specified). If
-one or more \fIoption\-value\fR pairs are specified, then the command
-modifies the given widget option(s) to have the given value(s); in
-this case the command returns an empty string.
-\fIOption\fR may have any of the values accepted by the \fBcanvas\fR
-command.
-.TP
-\fIpathName\fR \fBcoords \fItagOrId \fR?\fIx0 y0 ...\fR?
-.TP
-\fIpathName\fR \fBcoords \fItagOrId \fR?\fIcoordList\fR?
-.
-Query or modify the coordinates that define an item.
-If no coordinates are specified, this command returns a list
-whose elements are the coordinates of the item named by
-\fItagOrId\fR.
-If coordinates are specified, then they replace the current
-coordinates for the named item.
-If \fItagOrId\fR refers to multiple items, then
-the first one in the display list is used.
-.RS
-.PP
-Note that for rectangles, ovals and arcs the returned list of coordinates
-has a fixed order, namely the left, top, right and bottom coordinates,
-which may not be the order originally given. Also the coordinates are always
-returned in screen units with no units (that is, in pixels). So if the
-original coordinates were specified for instance in centimeters or inches,
-the returned values will nevertheless be in pixels.
-.RE
-.TP
-\fIpathName \fBcreate \fItype x y \fR?\fIx y ...\fR? ?\fIoption value ...\fR?
-.TP
-\fIpathName \fBcreate \fItype coordList \fR?\fIoption value ...\fR?
-.
-Create a new item in \fIpathName\fR of type \fItype\fR.
-The exact format of the arguments after \fItype\fR depends
-on \fItype\fR, but usually they consist of the coordinates for
-one or more points, followed by specifications for zero or
-more item options.
-See the subsections on individual item types below for more
-on the syntax of this command.
-This command returns the id for the new item.
-.TP
-\fIpathName \fBdchars \fItagOrId first \fR?\fIlast\fR?
-.
-For each item given by \fItagOrId\fR, delete the characters, or coordinates,
-in the range given by \fIfirst\fR and \fIlast\fR, inclusive.
-If some of the items given by \fItagOrId\fR do not support
-indexing operations then they ignore this operation.
-Text items interpret \fIfirst\fR and \fIlast\fR as indices to a character,
-line and polygon items interpret them as indices to a coordinate (an x,y pair).
-Indices are described in \fBINDICES\fR above.
-If \fIlast\fR is omitted, it defaults to \fIfirst\fR.
-This command returns an empty string.
-.TP
-\fIpathName \fBdelete \fR?\fItagOrId tagOrId ...\fR?
-.
-Delete each of the items given by each \fItagOrId\fR, and return
-an empty string.
-.TP
-\fIpathName \fBdtag \fItagOrId \fR?\fItagToDelete\fR?
-.
-For each of the items given by \fItagOrId\fR, delete the
-tag given by \fItagToDelete\fR from the list of those
-associated with the item.
-If an item does not have the tag \fItagToDelete\fR then
-the item is unaffected by the command.
-If \fItagToDelete\fR is omitted then it defaults to \fItagOrId\fR.
-This command returns an empty string.
-.TP
-\fIpathName \fBfind \fIsearchCommand \fR?\fIarg arg ...\fR?
-.
-This command returns a list consisting of all the items that
-meet the constraints specified by \fIsearchCommand\fR and
-\fIarg\fR's.
-\fISearchCommand\fR and \fIargs\fR have any of the forms
-accepted by the \fBaddtag\fR command.
-The items are returned in stacking order, with the lowest item first.
-.TP
-\fIpathName \fBfocus \fR?\fItagOrId\fR?
-.
-Set the keyboard focus for the canvas widget to the item given by
-\fItagOrId\fR.
-If \fItagOrId\fR refers to several items, then the focus is set
-to the first such item in the display list that supports the
-insertion cursor.
-If \fItagOrId\fR does not refer to any items, or if none of them
-support the insertion cursor, then the focus is not changed.
-If \fItagOrId\fR is an empty
-string, then the focus item is reset so that no item has the focus.
-If \fItagOrId\fR is not specified then the command returns the
-id for the item that currently has the focus, or an empty string
-if no item has the focus.
-.RS
-.PP
-Once the focus has been set to an item, the item will display
-the insertion cursor and all keyboard events will be directed
-to that item.
-The focus item within a canvas and the focus window on the
-screen (set with the \fBfocus\fR command) are totally independent:
-a given item does not actually have the input focus unless (a)
-its canvas is the focus window and (b) the item is the focus item
-within the canvas.
-In most cases it is advisable to follow the \fBfocus\fR widget
-command with the \fBfocus\fR command to set the focus window to
-the canvas (if it was not there already).
-.RE
-.TP
-\fIpathName \fBgettags\fR \fItagOrId\fR
-.
-Return a list whose elements are the tags associated with the
-item given by \fItagOrId\fR.
-If \fItagOrId\fR refers to more than one item, then the tags
-are returned from the first such item in the display list.
-If \fItagOrId\fR does not refer to any items, or if the item
-contains no tags, then an empty string is returned.
-.TP
-\fIpathName \fBicursor \fItagOrId index\fR
-.
-Set the position of the insertion cursor for the item(s) given by \fItagOrId\fR
-to just before the character whose position is given by \fIindex\fR.
-If some or all of the items given by \fItagOrId\fR do not support
-an insertion cursor then this command has no effect on them.
-See \fBINDICES\fR above for a description of the
-legal forms for \fIindex\fR.
-Note: the insertion cursor is only displayed in an item if
-that item currently has the keyboard focus (see the \fBfocus\fR widget
-command, above), but the cursor position may
-be set even when the item does not have the focus.
-This command returns an empty string.
-.TP
-\fIpathName \fBimove \fItagOrId index x y\fR
-.VS 8.6
-This command causes the \fIindex\fR'th coordinate of each of the items
-indicated by \fItagOrId\fR to be relocated to the location (\fIx\fR,\fIy\fR).
-Each item interprets \fIindex\fR independently according to the rules
-described in \fBINDICES\fR above. Out of the standard set of items, only line
-and polygon items may have their coordinates relocated this way.
-.VE 8.6
-.TP
-\fIpathName \fBindex \fItagOrId index\fR
-.
-This command returns a decimal string giving the numerical index
-within \fItagOrId\fR corresponding to \fIindex\fR.
-\fIIndex\fR gives a textual description of the desired position
-as described in \fBINDICES\fR above.
-Text items interpret \fIindex\fR as an index to a character,
-line and polygon items interpret it as an index to a coordinate (an x,y pair).
-The return value is guaranteed to lie between 0 and the number
-of characters, or coordinates, within the item, inclusive.
-If \fItagOrId\fR refers to multiple items, then the index
-is processed in the first of these items that supports indexing
-operations (in display list order).
-.TP
-\fIpathName \fBinsert \fItagOrId beforeThis string\fR
-.
-For each of the items given by \fItagOrId\fR, if the item supports
-text or coordinate, insertion then \fIstring\fR is inserted into the item's
-text just before the character, or coordinate, whose index is \fIbeforeThis\fR.
-Text items interpret \fIbeforeThis\fR as an index to a character,
-line and polygon items interpret it as an index to a coordinate (an x,y pair).
-For lines and polygons the \fIstring\fR must be a valid coordinate
-sequence.
-See \fBINDICES\fR above for information about the forms allowed
-for \fIbeforeThis\fR.
-This command returns an empty string.
-.TP
-\fIpathName \fBitemcget\fR \fItagOrId\fR \fIoption\fR
-.
-Returns the current value of the configuration option for the
-item given by \fItagOrId\fR whose name is \fIoption\fR.
-This command is similar to the \fBcget\fR widget command except that
-it applies to a particular item rather than the widget as a whole.
-\fIOption\fR may have any of the values accepted by the \fBcreate\fR
-widget command when the item was created.
-If \fItagOrId\fR is a tag that refers to more than one item,
-the first (lowest) such item is used.
-.TP
-\fIpathName \fBitemconfigure \fItagOrId\fR ?\fIoption\fR? ?\fIvalue\fR? ?\fIoption value ...\fR?
-.
-This command is similar to the \fBconfigure\fR widget command except
-that it modifies item-specific options for the items given by
-\fItagOrId\fR instead of modifying options for the overall
-canvas widget.
-If no \fIoption\fR is specified, returns a list describing all of
-the available options for the first item given by \fItagOrId\fR
-(see \fBTk_ConfigureInfo\fR for
-information on the format of this list). If \fIoption\fR is specified
-with no \fIvalue\fR, then the command returns a list describing the
-one named option (this list will be identical to the corresponding
-sublist of the value returned if no \fIoption\fR is specified). If
-one or more \fIoption\-value\fR pairs are specified, then the command
-modifies the given widget option(s) to have the given value(s) in
-each of the items given by \fItagOrId\fR; in
-this case the command returns an empty string.
-The \fIoption\fRs and \fIvalue\fRs are the same as those permissible
-in the \fBcreate\fR widget command when the item(s) were created;
-see the sections describing individual item types below for details
-on the legal options.
-.TP
-\fIpathName \fBlower \fItagOrId \fR?\fIbelowThis\fR?
-.
-Move all of the items given by \fItagOrId\fR to a new position
-in the display list just before the item given by \fIbelowThis\fR.
-If \fItagOrId\fR refers to more than one item then all are moved
-but the relative order of the moved items will not be changed.
-\fIBelowThis\fR is a tag or id; if it refers to more than one
-item then the first (lowest) of these items in the display list is used
-as the destination location for the moved items.
-Note: this command has no effect on window items. Window items always
-obscure other item types, and the stacking order of window items is
-determined by the \fBraise\fR command and \fBlower\fR command, not the
-\fBraise\fR widget command and \fBlower\fR widget command for canvases.
-This command returns an empty string.
-.TP
-\fIpathName \fBmove \fItagOrId xAmount yAmount\fR
-.
-Move each of the items given by \fItagOrId\fR in the canvas coordinate
-space by adding \fIxAmount\fR to the x-coordinate of each point
-associated with the item and \fIyAmount\fR to the y-coordinate of
-each point associated with the item.
-This command returns an empty string.
-.TP
-\fIpathName \fBmoveto \fItagOrId xPos yPos\fR
-.VS 8.6
-Move the items given by \fItagOrId\fR in the canvas coordinate
-space so that the first coordinate pair of the bottommost item with
-tag \fItagOrId\fR is located at
-position (\fIxPos\fR,\fIyPos\fR). \fIxPos\fR and \fIyPos\fR may be
-the empty string, in which case the corresponding coordinate
-will be unchanged. All items matching
-\fItagOrId\fR remain in the same positions relative to each other.
-This command returns an empty string.
-.VE 8.6
-.TP
-\fIpathName \fBpostscript \fR?\fIoption value option value ...\fR?
-.
-Generate a Postscript representation for part or all of the canvas.
-If the \fB\-file\fR option is specified then the Postscript is written
-to a file and an empty string is returned; otherwise the Postscript
-is returned as the result of the command.
-If the interpreter that owns the canvas is marked as safe, the operation
-will fail because safe interpreters are not allowed to write files.
-If the \fB\-channel\fR option is specified, the argument denotes the name
-of a channel already opened for writing. The Postscript is written to
-that channel, and the channel is left open for further writing at the end
-of the operation.
-The Postscript is created in Encapsulated Postscript form using
-version 3.0 of the Document Structuring Conventions.
-Note: by default Postscript is only generated for information that
-appears in the canvas's window on the screen. If the canvas is
-freshly created it may still have its initial size of 1x1 pixel
-so nothing will appear in the Postscript. To get around this problem
-either invoke the \fBupdate\fR command to wait for the canvas window
-to reach its final size, or else use the \fB\-width\fR and \fB\-height\fR
-options to specify the area of the canvas to print.
-The \fIoption\fR\-\fIvalue\fR argument pairs provide additional
-information to control the generation of Postscript. The following
-options are supported:
-.RS
-.TP
-\fB\-channel \fIchannelName\fR
-.
-Specifies the name of the channel to which to write the Postscript.
-If this option and the \fB\-file\fR option are
-not specified then the Postscript is returned as the
-result of the command.
-.TP
-\fB\-colormap \fIvarName\fR
-.
-\fIVarName\fR must be the name of an array variable
-that specifies a color mapping to use in the Postscript.
-Each element of \fIvarName\fR must consist of Postscript
-code to set a particular color value (e.g.
-.QW "\fB1.0 1.0 0.0 setrgbcolor\fR" ).
-When outputting color information in the Postscript, Tk checks
-to see if there is an element of \fIvarName\fR with the same
-name as the color.
-If so, Tk uses the value of the element as the Postscript command
-to set the color.
-If this option has not been specified, or if there is no entry
-in \fIvarName\fR for a given color, then Tk uses the red, green,
-and blue intensities from the X color.
-.TP
-\fB\-colormode \fImode\fR
-.
-Specifies how to output color information. \fIMode\fR must be either
-\fBcolor\fR (for full color output), \fBgray\fR (convert all colors
-to their gray-scale equivalents) or \fBmono\fR (convert all colors
-to black or white).
-.TP
-\fB\-file \fIfileName\fR
-.
-Specifies the name of the file in which to write the Postscript.
-If this option and the \fB\-channel\fR option are
-not specified then the Postscript is returned as the
-result of the command.
-.TP
-\fB\-fontmap \fIvarName\fR
-.
-\fIVarName\fR must be the name of an array variable
-that specifies a font mapping to use in the Postscript.
-Each element of \fIvarName\fR must consist of a Tcl list with
-two elements, which are the name and point size of a Postscript font.
-When outputting Postscript commands for a particular font, Tk
-checks to see if \fIvarName\fR contains an element with the same
-name as the font.
-If there is such an element, then the font information contained in
-that element is used in the Postscript.
-Otherwise Tk attempts to guess what Postscript font to use.
-Tk's guesses generally only work for well-known fonts such as
-Times and Helvetica and Courier, and only if the X font name does not
-omit any dashes up through the point size.
-For example, \fB\-*\-Courier\-Bold\-R\-Normal\-\-*\-120\-*\fR will work but
-\fB*Courier\-Bold\-R\-Normal*120*\fR will not; Tk needs the dashes to
-parse the font name).
-.TP
-\fB\-height \fIsize\fR
-.
-Specifies the height of the area of the canvas to print.
-Defaults to the height of the canvas window.
-.TP
-\fB\-pageanchor \fIanchor\fR
-.
-Specifies which point of the printed area of the canvas should appear over
-the positioning point on the page (which is given by the \fB\-pagex\fR
-and \fB\-pagey\fR options).
-For example, \fB\-pageanchor n\fR means that the top center of the
-area of the canvas being printed (as it appears in the canvas window)
-should be over the positioning point. Defaults to \fBcenter\fR.
-.TP
-\fB\-pageheight \fIsize\fR
-.
-Specifies that the Postscript should be scaled in both x and y so
-that the printed area is \fIsize\fR high on the Postscript page.
-\fISize\fR consists of a floating-point number followed by
-\fBc\fR for centimeters, \fBi\fR for inches, \fBm\fR for millimeters,
-or \fBp\fR or nothing for printer's points (1/72 inch).
-Defaults to the height of the printed area on the screen.
-If both \fB\-pageheight\fR and \fB\-pagewidth\fR are specified then
-the scale factor from \fB\-pagewidth\fR is used (non-uniform scaling
-is not implemented).
-.TP
-\fB\-pagewidth \fIsize\fR
-.
-Specifies that the Postscript should be scaled in both x and y so
-that the printed area is \fIsize\fR wide on the Postscript page.
-\fISize\fR has the same form as for \fB\-pageheight\fR.
-Defaults to the width of the printed area on the screen.
-If both \fB\-pageheight\fR and \fB\-pagewidth\fR are specified then
-the scale factor from \fB\-pagewidth\fR is used (non-uniform scaling
-is not implemented).
-.TP
-\fB\-pagex \fIposition\fR
-.
-\fIPosition\fR gives the x-coordinate of the positioning point on
-the Postscript page, using any of the forms allowed for \fB\-pageheight\fR.
-Used in conjunction with the \fB\-pagey\fR and \fB\-pageanchor\fR options
-to determine where the printed area appears on the Postscript page.
-Defaults to the center of the page.
-.TP
-\fB\-pagey \fIposition\fR
-.
-\fIPosition\fR gives the y-coordinate of the positioning point on
-the Postscript page, using any of the forms allowed for \fB\-pageheight\fR.
-Used in conjunction with the \fB\-pagex\fR and \fB\-pageanchor\fR options
-to determine where the printed area appears on the Postscript page.
-Defaults to the center of the page.
-.TP
-\fB\-rotate \fIboolean\fR
-.
-\fIBoolean\fR specifies whether the printed area is to be rotated 90
-degrees.
-In non-rotated output the x-axis of the printed area runs along
-the short dimension of the page
-.PQ portrait " orientation" ;
-in rotated output the x-axis runs along the long dimension of the page
-.PQ landscape " orientation" .
-Defaults to non-rotated.
-.TP
-\fB\-width \fIsize\fR
-.
-Specifies the width of the area of the canvas to print.
-Defaults to the width of the canvas window.
-.TP
-\fB\-x \fIposition\fR
-.
-Specifies the x-coordinate of the left edge of the area of the
-canvas that is to be printed, in canvas coordinates, not window
-coordinates.
-Defaults to the coordinate of the left edge of the window.
-.TP
-\fB\-y \fIposition\fR
-.
-Specifies the y-coordinate of the top edge of the area of the
-canvas that is to be printed, in canvas coordinates, not window
-coordinates.
-Defaults to the coordinate of the top edge of the window.
-.RE
-.TP
-\fIpathName \fBraise \fItagOrId \fR?\fIaboveThis\fR?
-.
-Move all of the items given by \fItagOrId\fR to a new position
-in the display list just after the item given by \fIaboveThis\fR.
-If \fItagOrId\fR refers to more than one item then all are moved
-but the relative order of the moved items will not be changed.
-\fIAboveThis\fR is a tag or id; if it refers to more than one
-item then the last (topmost) of these items in the display list is used
-as the destination location for the moved items.
-This command returns an empty string.
-.RS
-.PP
-Note: this command has no effect on window items. Window items always
-obscure other item types, and the stacking order of window items is
-determined by the \fBraise\fR command and \fBlower\fR command, not the
-\fBraise\fR widget command and \fBlower\fR widget command for canvases.
-.RE
-.TP
-\fIpathName \fBrchars \fItagOrId first last string\fR
-.VS 8.6
-This command causes the text or coordinates between \fIfirst\fR and \fIlast\fR
-for each of the items indicated by \fItagOrId\fR to be replaced by
-\fIstring\fR. Each item interprets \fIfirst\fR and \fIlast\fR independently
-according to the rules described in \fBINDICES\fR above. Out of the standard
-set of items, text items support this operation by altering their text as
-directed, and line and polygon items support this operation by altering their
-coordinate list (in which case \fIstring\fR should be a list of coordinates to
-use as a replacement). The other items ignore this operation.
-.VE 8.6
-.TP
-\fIpathName \fBscale \fItagOrId xOrigin yOrigin xScale yScale\fR
-.
-Rescale the coordinates of all of the items given by \fItagOrId\fR in canvas
-coordinate space.
-\fIXOrigin\fR and \fIyOrigin\fR identify the origin for the scaling
-operation and \fIxScale\fR and \fIyScale\fR identify the scale
-factors for x- and y-coordinates, respectively (a scale factor of
-1.0 implies no change to that coordinate).
-For each of the points defining each item, the x-coordinate is
-adjusted to change the distance from \fIxOrigin\fR by a factor
-of \fIxScale\fR.
-Similarly, each y-coordinate is adjusted to change the distance
-from \fIyOrigin\fR by a factor of \fIyScale\fR.
-This command returns an empty string.
-.RS
-.PP
-Note that some items have only a single pair of coordinates (e.g., text,
-images and windows) and so scaling of them by this command can only move them
-around.
-.RE
-.TP
-\fIpathName \fBscan\fR \fIoption args\fR
-.
-This command is used to implement scanning on canvases. It has
-two forms, depending on \fIoption\fR:
-.RS
-.TP
-\fIpathName \fBscan mark \fIx y\fR
-.
-Records \fIx\fR and \fIy\fR and the canvas's current view; used
-in conjunction with later \fBscan dragto\fR commands.
-Typically this command is associated with a mouse button press in
-the widget and \fIx\fR and \fIy\fR are the coordinates of the
-mouse. It returns an empty string.
-.TP
-\fIpathName \fBscan dragto \fIx y ?gain?\fR
-.
-This command computes the difference between its \fIx\fR and \fIy\fR
-arguments (which are typically mouse coordinates) and the \fIx\fR and
-\fIy\fR arguments to the last \fBscan mark\fR command for the widget.
-It then adjusts the view by \fIgain\fR times the
-difference in coordinates, where \fIgain\fR defaults to 10.
-This command is typically associated
-with mouse motion events in the widget, to produce the effect of
-dragging the canvas at high speed through its window. The return
-value is an empty string.
-.RE
-.TP
-\fIpathName \fBselect \fIoption\fR ?\fItagOrId arg\fR?
-.
-Manipulates the selection in one of several ways, depending on
-\fIoption\fR.
-The command may take any of the forms described below.
-In all of the descriptions below, \fItagOrId\fR must refer to
-an item that supports indexing and selection; if it refers to
-multiple items then the first of
-these that supports indexing and the selection is used.
-\fIIndex\fR gives a textual description of a position
-within \fItagOrId\fR, as described in \fBINDICES\fR above.
-.RS
-.TP
-\fIpathName \fBselect adjust \fItagOrId index\fR
-.
-Locate the end of the selection in \fItagOrId\fR nearest
-to the character given by \fIindex\fR, and adjust that
-end of the selection to be at \fIindex\fR (i.e. including
-but not going beyond \fIindex\fR).
-The other end of the selection is made the anchor point
-for future \fBselect to\fR commands.
-If the selection is not currently in \fItagOrId\fR then
-this command behaves the same as the \fBselect to\fR widget
-command.
-Returns an empty string.
-.TP
-\fIpathName \fBselect clear\fR
-.
-Clear the selection if it is in this widget.
-If the selection is not in this widget then the command
-has no effect.
-Returns an empty string.
-.TP
-\fIpathName \fBselect from \fItagOrId index\fR
-.
-Set the selection anchor point for the widget to be just
-before the character
-given by \fIindex\fR in the item given by \fItagOrId\fR.
-This command does not change the selection; it just sets
-the fixed end of the selection for future \fBselect to\fR
-commands.
-Returns an empty string.
-.TP
-\fIpathName \fBselect item\fR
-.
-Returns the id of the selected item, if the selection is in an
-item in this canvas.
-If the selection is not in this canvas then an empty string
-is returned.
-.TP
-\fIpathName \fBselect to \fItagOrId index\fR
-.
-Set the selection to consist of those characters of \fItagOrId\fR
-between the selection anchor point and
-\fIindex\fR.
-The new selection will include the character given by \fIindex\fR;
-it will include the character given by the anchor point only if
-\fIindex\fR is greater than or equal to the anchor point.
-The anchor point is determined by the most recent \fBselect adjust\fR
-or \fBselect from\fR command for this widget.
-If the selection anchor point for the widget is not currently in
-\fItagOrId\fR, then it is set to the same character given
-by \fIindex\fR.
-Returns an empty string.
-.RE
-.TP
-\fIpathName \fBtype\fI tagOrId\fR
-.
-Returns the type of the item given by \fItagOrId\fR, such as
-\fBrectangle\fR or \fBtext\fR.
-If \fItagOrId\fR refers to more than one item, then the type
-of the first item in the display list is returned.
-If \fItagOrId\fR does not refer to any items at all then
-an empty string is returned.
-.TP
-\fIpathName \fBxview \fR?\fIargs\fR?
-.
-This command is used to query and change the horizontal position of the
-information displayed in the canvas's window.
-It can take any of the following forms:
-.RS
-.TP
-\fIpathName \fBxview\fR
-.
-Returns a list containing two elements.
-Each element is a real fraction between 0 and 1; together they describe
-the horizontal span that is visible in the window.
-For example, if the first element is .2 and the second element is .6,
-20% of the canvas's area (as defined by the \fB\-scrollregion\fR option)
-is off-screen to the left, the middle 40% is visible
-in the window, and 40% of the canvas is off-screen to the right.
-These are the same values passed to scrollbars via the \fB\-xscrollcommand\fR
-option.
-.TP
-\fIpathName \fBxview moveto\fI fraction\fR
-.
-Adjusts the view in the window so that \fIfraction\fR of the
-total width of the canvas is off-screen to the left.
-\fIFraction\fR must be a fraction between 0 and 1.
-.TP
-\fIpathName \fBxview scroll \fInumber what\fR
-.
-This command shifts the view in the window left or right according to
-\fInumber\fR and \fIwhat\fR.
-\fINumber\fR must be an integer.
-\fIWhat\fR must be either \fBunits\fR or \fBpages\fR or an abbreviation
-of one of these.
-If \fIwhat\fR is \fBunits\fR, the view adjusts left or right in units
-of the \fBxScrollIncrement\fR option, if it is greater than zero,
-or in units of one-tenth the window's width otherwise.
-If \fIwhat is \fBpages\fR then the view
-adjusts in units of nine-tenths the window's width.
-If \fInumber\fR is negative then information farther to the left
-becomes visible; if it is positive then information farther to the right
-becomes visible.
-.RE
-.TP
-\fIpathName \fByview \fI?args\fR?
-.
-This command is used to query and change the vertical position of the
-information displayed in the canvas's window.
-It can take any of the following forms:
-.RS
-.TP
-\fIpathName \fByview\fR
-.
-Returns a list containing two elements.
-Each element is a real fraction between 0 and 1; together they describe
-the vertical span that is visible in the window.
-For example, if the first element is .6 and the second element is 1.0,
-the lowest 40% of the canvas's area (as defined by the \fB\-scrollregion\fR
-option) is visible in the window.
-These are the same values passed to scrollbars via the \fB\-yscrollcommand\fR
-option.
-.TP
-\fIpathName \fByview moveto\fI fraction\fR
-.
-Adjusts the view in the window so that \fIfraction\fR of the canvas's
-area is off-screen to the top.
-\fIFraction\fR is a fraction between 0 and 1.
-.TP
-\fIpathName \fByview scroll \fInumber what\fR
-.
-This command adjusts the view in the window up or down according to
-\fInumber\fR and \fIwhat\fR.
-\fINumber\fR must be an integer.
-\fIWhat\fR must be either \fBunits\fR or \fBpages\fR.
-If \fIwhat\fR is \fBunits\fR, the view adjusts up or down in units
-of the \fByScrollIncrement\fR option, if it is greater than zero,
-or in units of one-tenth the window's height otherwise.
-If \fIwhat\fR is \fBpages\fR then
-the view adjusts in units of nine-tenths the window's height.
-If \fInumber\fR is negative then higher information becomes
-visible; if it is positive then lower information
-becomes visible.
-.RE
-.SH "OVERVIEW OF ITEM TYPES"
-.PP
-The sections below describe the various types of items supported
-by canvas widgets. Each item type is characterized by two things:
-first, the form of the \fBcreate\fR command used to create
-instances of the type; and second, a set of configuration options
-for items of that type, which may be used in the
-\fBcreate\fR and \fBitemconfigure\fR widget commands.
-Most items do not support indexing or selection or the commands
-related to them, such as \fBindex\fR and \fBinsert\fR.
-Where items do support these facilities, it is noted explicitly
-in the descriptions below.
-At present, text, line and polygon items provide this support.
-For lines and polygons the indexing facility is used to manipulate
-the coordinates of the item.
-.SS "COMMON ITEM OPTIONS"
-.PP
-Many items share a common set of options. These options are
-explained here, and then referred to be each widget type for brevity.
-.TP
-\fB\-anchor \fIanchorPos\fR
-.
-\fIAnchorPos\fR tells how to position the item relative to the
-positioning point for the item; it may have any of the forms
-accepted by \fBTk_GetAnchor\fR. For example, if \fIanchorPos\fR
-is \fBcenter\fR then the item is centered on the point; if
-\fIanchorPos\fR is \fBn\fR then the item will be drawn so that
-its top center point is at the positioning point.
-This option defaults to \fBcenter\fR.
-.TP
-\fB\-dash \fIpattern\fR
-.TP
-\fB\-activedash \fIpattern\fR
-.TP
-\fB\-disableddash \fIpattern\fR
-.
-This option specifies dash patterns for the normal, active
-state, and disabled state of an item.
-\fIpattern\fR may have any of the forms accepted by \fBTk_GetDash\fR.
-If the dash options are omitted then the default is a solid outline.
-See \fBDASH PATTERNS\fR for more information.
-.TP
-\fB\-dashoffset \fIoffset\fR
-.
-The starting \fIoffset\fR in pixels into the pattern provided by the
-\fB\-dash\fR option. \fB\-dashoffset\fR is ignored if there is no
-\fB\-dash\fR pattern. The \fIoffset\fR may have any of the forms described
-in the \fBCOORDINATES\fR section above.
-.TP
-\fB\-fill \fIcolor\fR
-.TP
-\fB\-activefill \fIcolor\fR
-.TP
-\fB\-disabledfill \fIcolor\fR
-.
-Specifies the color to be used to fill item's area.
-in its normal, active, and disabled states,
-\fIColor\fR may have any of the forms accepted by \fBTk_GetColor\fR.
-If \fIcolor\fR is an empty string (the default),
-then the item will not be filled.
-For the line item, it specifies the color of the line drawn.
-For the text item, it specifies the foreground color of the text.
-.TP
-\fB\-outline \fIcolor\fR
-.TP
-\fB\-activeoutline \fIcolor\fR
-.TP
-\fB\-disabledoutline \fIcolor\fR
-.
-This option specifies the color that should be used to draw the
-outline of the item in its normal, active and disabled states.
-\fIColor\fR may have any of the forms accepted by \fBTk_GetColor\fR.
-This option defaults to \fBblack\fR. If \fIcolor\fR is specified
-as an empty string then no outline is drawn for the item.
-.TP
-\fB\-offset \fIoffset\fR
-.
-Specifies the offset of stipples. The offset value can be of the form
-\fBx,y\fR or \fIside\fR, where side can be \fBn\fR, \fBne\fR, \fBe\fR,
-\fBse\fR, \fBs\fR, \fBsw\fR, \fBw\fR, \fBnw\fR, or \fBcenter\fR. In the
-first case the origin is the origin of the toplevel of the current window.
-For the canvas itself and canvas objects the origin is the canvas origin,
-but putting \fB#\fR in front of the coordinate pair indicates using the
-toplevel origin instead. For canvas objects, the \fB\-offset\fR option is
-used for stippling as well. For the line and polygon canvas items you can
-also specify an index as argument, which connects the stipple origin to one
-of the coordinate points of the line/polygon. Note that stipple offsets are
-\fIonly supported on X11\fR; they are silently ignored on other platforms.
-.TP
-\fB\-outlinestipple \fIbitmap\fR
-.TP
-\fB\-activeoutlinestipple \fIbitmap\fR
-.TP
-\fB\-disabledoutlinestipple \fIbitmap\fR
-.
-This option specifies stipple patterns that should be used to draw the
-outline of the item in its normal, active and disabled states.
-Indicates that the outline for the item should be drawn with a stipple pattern;
-\fIbitmap\fR specifies the stipple pattern to use, in any of the
-forms accepted by \fBTk_GetBitmap\fR.
-If the \fB\-outline\fR option has not been specified then this option
-has no effect.
-If \fIbitmap\fR is an empty string (the default), then the outline is drawn
-in a solid fashion.
-\fINote that stipples are not well supported on platforms that do not
-use X11 as their drawing API.\fR
-.TP
-\fB\-outlineoffset \fIoffset\fR
-.
-Specifies the offset of the stipple pattern used for outlines, in the same way
-that the \fB\-outline\fR option controls fill stipples. (See the
-\fB\-outline\fR option for a description of the syntax of \fIoffset\fR.)
-.TP
-\fB\-stipple \fIbitmap\fR
-.TP
-\fB\-activestipple \fIbitmap\fR
-.TP
-\fB\-disabledstipple \fIbitmap\fR
-.
-This option specifies stipple patterns that should be used to fill
-the item in its normal, active and disabled states.
-\fIbitmap\fR specifies the stipple pattern to use, in any of the
-forms accepted by \fBTk_GetBitmap\fR.
-If the \fB\-fill\fR option has not been specified then this option
-has no effect.
-If \fIbitmap\fR is an empty string (the default), then filling is done
-in a solid fashion.
-For the text item, it affects the actual text.
-\fINote that stipples are not well supported on platforms that do not
-use X11 as their drawing API.\fR
-.TP
-\fB\-state \fIstate\fR
-.
-This allows an item to override the canvas widget's global \fIstate\fR
-option. It takes the same values:
-\fInormal\fR, \fIdisabled\fR or \fIhidden\fR.
-.TP
-\fB\-tags \fItagList\fR
-.
-Specifies a set of tags to apply to the item.
-\fITagList\fR consists of a list of tag names, which replace any
-existing tags for the item. \fITagList\fR may be an empty list.
-.TP
-\fB\-width \fIoutlineWidth\fR
-.TP
-\fB\-activewidth \fIoutlineWidth\fR
-.TP
-\fB\-disabledwidth \fIoutlineWidth\fR
-.
-Specifies the width of the outline to be drawn around
-the item's region, in its normal, active and disabled states.
-\fIoutlineWidth\fR may be in any of the forms described in the
-\fBCOORDINATES\fR section above.
-If the \fB\-outline\fR option has been specified as an empty string then
-this option has no effect. This option defaults to 1.0.
-For arcs, wide outlines will be drawn centered on the edges of the
-arc's region.
-.SH "STANDARD ITEM TYPES"
-.SS "ARC ITEMS"
-.PP
-Items of type \fBarc\fR appear on the display as arc-shaped regions.
-An arc is a section of an oval delimited by two angles (specified
-by the \fB\-start\fR and \fB\-extent\fR options) and displayed in
-one of several ways (specified by the \fB\-style\fR option).
-Arcs are created with widget commands of the following form:
-.CS
-\fIpathName \fBcreate arc \fIx1 y1 x2 y2 \fR?\fIoption value ...\fR?
-\fIpathName \fBcreate arc \fIcoordList\fR ?\fIoption value ...\fR?
-.CE
-The arguments \fIx1\fR, \fIy1\fR, \fIx2\fR, and \fIy2\fR or \fIcoordList\fR give
-the coordinates of two diagonally opposite corners of a
-rectangular region enclosing the oval that defines the arc.
-After the coordinates there may be any number of \fIoption\fR\-\fIvalue\fR
-pairs, each of which sets one of the configuration options
-for the item. These same \fIoption\fR\-\fIvalue\fR pairs may be
-used in \fBitemconfigure\fR widget commands to change the item's
-configuration. An arc item becomes the current item when the mouse pointer is
-over any part that is painted or (when fully transparent) that would be
-painted if both the \fB\-fill\fR and \fB\-outline\fR options were non-empty.
-.PP
-The following standard options are supported by arcs:
-.DS
-.ta 3i
-\fB\-dash\fR	\fB\-activedash\fR
-\fB\-disableddash\fR	\fB\-dashoffset\fR
-\fB\-fill\fR	\fB\-activefill\fR
-\fB\-disabledfill\fR	\fB\-offset\fR
-\fB\-outline\fR	\fB\-activeoutline\fR
-\fB\-disabledoutline\fR	\fB\-outlineoffset\fR
-\fB\-outlinestipple\fR	\fB\-activeoutlinestipple\fR
-\fB\-disabledoutlinestipple\fR	\fB\-stipple\fR
-\fB\-activestipple\fR	\fB\-disabledstipple\fR
-\fB\-state\fR	\fB\-tags\fR
-\fB\-width\fR	\fB\-activewidth\fR
-\fB\-disabledwidth\fR
-.DE
-The following extra options are supported for arcs:
-.TP
-\fB\-extent \fIdegrees\fR
-Specifies the size of the angular range occupied by the arc.
-The arc's range extends for \fIdegrees\fR degrees counter-clockwise
-from the starting angle given by the \fB\-start\fR option.
-\fIDegrees\fR may be negative.
-If it is greater than 360 or less than \-360, then \fIdegrees\fR
-modulo 360 is used as the extent.
-.TP
-\fB\-start \fIdegrees\fR
-Specifies the beginning of the angular range occupied by the
-arc.
-\fIDegrees\fR is given in units of degrees measured counter-clockwise
-from the 3-o'clock position; it may be either positive or negative.
-.TP
-\fB\-style \fItype\fR
-Specifies how to draw the arc. If \fItype\fR is \fBpieslice\fR
-(the default) then the arc's region is defined by a section
-of the oval's perimeter plus two line segments, one between the center
-of the oval and each end of the perimeter section.
-If \fItype\fR is \fBchord\fR then the arc's region is defined
-by a section of the oval's perimeter plus a single line segment
-connecting the two end points of the perimeter section.
-If \fItype\fR is \fBarc\fR then the arc's region consists of
-a section of the perimeter alone.
-In this last case the \fB\-fill\fR option is ignored.
-.SS "BITMAP ITEMS"
-.PP
-Items of type \fBbitmap\fR appear on the display as images with
-two colors, foreground and background.
-Bitmaps are created with widget commands of the following form:
-.CS
-\fIpathName \fBcreate bitmap \fIx y \fR?\fIoption value ...\fR?
-\fIpathName \fBcreate bitmap \fIcoordList\fR ?\fIoption value ...\fR?
-.CE
-The arguments \fIx\fR and \fIy\fR or \fIcoordList\fR (which must have two
-elements) specify the coordinates of a
-point used to position the bitmap on the display, as controlled by the
-\fB\-anchor\fR option.
-After the coordinates there may be any number of \fIoption\fR\-\fIvalue\fR
-pairs, each of which sets one of the configuration options
-for the item. These same \fIoption\fR\-\fIvalue\fR pairs may be
-used in \fBitemconfigure\fR widget commands to change the item's
-configuration. A bitmap item becomes the current item when the mouse pointer
-is over any part of its bounding box.
-.PP
-The following standard options are supported by bitmaps:
-.DS
-.ta 3i
-\fB\-anchor\fR	\fB\-state\fR
-\fB\-tags\fR
-.DE
-The following extra options are supported for bitmaps:
-.TP
-\fB\-background \fIcolor\fR
-.TP
-\fB\-activebackground \fIcolor\fR
-.TP
-\fB\-disabledbackground \fIcolor\fR
-Specifies the color to use for each of the bitmap's
-.QW 0
-valued pixels in its normal, active and disabled states.
-\fIColor\fR may have any of the forms accepted by \fBTk_GetColor\fR.
-If this option is not specified, or if it is specified as an empty
-string, then nothing is displayed where the bitmap pixels are 0; this
-produces a transparent effect.
-.TP
-\fB\-bitmap \fIbitmap\fR
-.TP
-\fB\-activebitmap \fIbitmap\fR
-.TP
-\fB\-disabledbitmap \fIbitmap\fR
-Specifies the bitmaps to display in the item in its normal, active and
-disabled states.
-\fIBitmap\fR may have any of the forms accepted by \fBTk_GetBitmap\fR.
-.TP
-\fB\-foreground \fIcolor\fR
-.TP
-\fB\-activeforeground \fIcolor\fR
-.TP
-\fB\-disabledforeground \fIcolor\fR
-Specifies the color to use for each of the bitmap's
-.QW 1
-valued pixels in its normal, active and disabled states.
-\fIColor\fR may have any of the forms accepted by \fBTk_GetColor\fR and
-defaults to \fBblack\fR.
-.SS "IMAGE ITEMS"
-.PP
-Items of type \fBimage\fR are used to display images on a
-canvas.
-Images are created with widget commands of the following form:
-.CS
-\fIpathName \fBcreate image \fIx y \fR?\fIoption value ...\fR?
-\fIpathName \fBcreate image \fIcoordList\fR ?\fIoption value ...\fR?
-.CE
-The arguments \fIx\fR and \fIy\fR or \fIcoordList\fR specify the coordinates of a
-point used to position the image on the display, as controlled by the
-\fB\-anchor\fR option.
-After the coordinates there may be any number of \fIoption\fR\-\fIvalue\fR
-pairs, each of which sets one of the configuration options
-for the item. These same \fIoption\fR\-\fIvalue\fR pairs may be
-used in \fBitemconfigure\fR widget commands to change the item's
-configuration. An image item becomes the current item when the mouse pointer
-is over any part of its bounding box.
-.PP
-The following standard options are supported by images:
-.DS
-.ta 3i
-\fB\-anchor\fR	\fB\-state\fR
-\fB\-tags\fR
-.DE
-The following extra options are supported for images:
-.TP
-\fB\-image \fIname\fR
-.TP
-\fB\-activeimage \fIname\fR
-.TP
-\fB\-disabledimage \fIname\fR
-Specifies the name of the images to display in the item in is normal,
-active and disabled states.
-This image must have been created previously with the
-\fBimage create\fR command.
-.SS "LINE ITEMS"
-.PP
-Items of type \fBline\fR appear on the display as one or more connected
-line segments or curves.
-Line items support coordinate indexing operations using the \fBdchars\fR,
-\fBindex\fR and \fBinsert\fR widget commands.
-Lines are created with widget commands of the following form:
-.CS
-\fIpathName \fBcreate line \fIx1 y1... xn yn \fR?\fIoption value ...\fR?
-\fIpathName \fBcreate line \fIcoordList\fR ?\fIoption value ...\fR?
-.CE
-The arguments \fIx1\fR through \fIyn\fR or \fIcoordList\fR give
-the coordinates for a series of two or more points that describe
-a series of connected line segments.
-After the coordinates there may be any number of \fIoption\fR\-\fIvalue\fR
-pairs, each of which sets one of the configuration options
-for the item. These same \fIoption\fR\-\fIvalue\fR pairs may be
-used in \fBitemconfigure\fR widget commands to change the item's
-configuration. A line item is the current item whenever the mouse pointer is
-over any segment of the line, whether drawn or not and whether or not the line
-is smoothed.
-.PP
-The following standard options are supported by lines:
-.DS
-.ta 3i
-\fB\-dash\fR	\fB\-activedash\fR
-\fB\-disableddash\fR	\fB\-dashoffset\fR
-\fB\-fill\fR	\fB\-activefill\fR
-\fB\-disabledfill\fR	\fB\-stipple\fR
-\fB\-activestipple\fR	\fB\-disabledstipple\fR
-\fB\-state\fR	\fB\-tags\fR
-\fB\-width\fR	\fB\-activewidth\fR
-\fB\-disabledwidth\fR
-.DE
-The following extra options are supported for lines:
-.TP
-\fB\-arrow \fIwhere\fR
-Indicates whether or not arrowheads are to be drawn at one or both
-ends of the line.
-\fIWhere\fR must have one of the values \fBnone\fR (for no arrowheads),
-\fBfirst\fR (for an arrowhead at the first point of the line),
-\fBlast\fR (for an arrowhead at the last point of the line), or
-\fBboth\fR (for arrowheads at both ends).
-This option defaults to \fBnone\fR.
-.TP
-\fB\-arrowshape \fIshape\fR
-This option indicates how to draw arrowheads.
-The \fIshape\fR argument must be a list with three elements, each
-specifying a distance in any of the forms described in
-the \fBCOORDINATES\fR section above.
-The first element of the list gives the distance along the line
-from the neck of the arrowhead to its tip.
-The second element gives the distance along the line from the
-trailing points of the arrowhead to the tip, and the third
-element gives the distance from the outside edge of the line to the
-trailing points.
-If this option is not specified then Tk picks a
-.QW reasonable
-shape.
-.TP
-\fB\-capstyle \fIstyle\fR
-Specifies the ways in which caps are to be drawn at the endpoints
-of the line.
-\fIStyle\fR may have any of the forms accepted by \fBTk_GetCapStyle\fR
-(\fBbutt\fR, \fBprojecting\fR, or \fBround\fR).
-If this option is not specified then it defaults to \fBbutt\fR.
-Where arrowheads are drawn the cap style is ignored.
-.TP
-\fB\-joinstyle \fIstyle\fR
-Specifies the ways in which joints are to be drawn at the vertices
-of the line.
-\fIStyle\fR may have any of the forms accepted by \fBTk_GetJoinStyle\fR
-(\fBbevel\fR, \fBmiter\fR, or \fBround\fR).
-If this option is not specified then it defaults to \fBround\fR.
-If the line only contains two points then this option is
-irrelevant.
-.TP
-\fB\-smooth \fIsmoothMethod\fR
-\fIsmoothMethod\fR must have one of the forms accepted by
-\fBTcl_GetBoolean\fR or a line smoothing method.
-Only \fBtrue\fR and \fBraw\fR are
-supported in the core (with \fBbezier\fR being an alias for \fBtrue\fR), but more can be added at runtime. If a boolean
-false value or empty string is given, no smoothing is applied. A boolean
-truth value assumes \fBtrue\fR smoothing.
-If the smoothing method is \fBtrue\fR, this indicates that the line
-should be drawn as a curve, rendered as a set of quadratic splines: one spline
-is drawn for the first and second line segments, one for the second
-and third, and so on. Straight-line segments can be generated within
-a curve by duplicating the end-points of the desired line segment.
-If the smoothing method is \fBraw\fR, this indicates that the line
-should also be drawn as a curve but where the list of coordinates is
-such that the first coordinate pair (and every third coordinate pair
-thereafter) is a knot point on a cubic Bezier curve, and the other
-coordinates are control points on the cubic Bezier curve. Straight
-line segments can be generated within a curve by making control points
-equal to their neighbouring knot points. If the last point is a
-control point and not a knot point, the point is repeated (one or two
-times) so that it also becomes a knot point.
-.TP
-\fB\-splinesteps \fInumber\fR
-Specifies the degree of smoothness desired for curves: each spline
-will be approximated with \fInumber\fR line segments. This
-option is ignored unless the \fB\-smooth\fR option is true or \fBraw\fR.
-.SS "OVAL ITEMS"
-.PP
-Items of type \fBoval\fR appear as circular or oval regions on
-the display. Each oval may have an outline, a fill, or
-both. Ovals are created with widget commands of the
-following form:
-.CS
-\fIpathName \fBcreate oval \fIx1 y1 x2 y2 \fR?\fIoption value ...\fR?
-\fIpathName \fBcreate oval \fIcoordList\fR ?\fIoption value ...\fR?
-.CE
-The arguments \fIx1\fR, \fIy1\fR, \fIx2\fR, and \fIy2\fR or \fIcoordList\fR give
-the coordinates of two diagonally opposite corners of a
-rectangular region enclosing the oval.
-The oval will include the top and left edges of the rectangle
-not the lower or right edges.
-If the region is square then the resulting oval is circular;
-otherwise it is elongated in shape.
-After the coordinates there may be any number of \fIoption\fR\-\fIvalue\fR
-pairs, each of which sets one of the configuration options
-for the item. These same \fIoption\fR\-\fIvalue\fR pairs may be
-used in \fBitemconfigure\fR widget commands to change the item's
-configuration. An oval item becomes the current item when the mouse pointer is
-over any part that is painted or (when fully transparent) that would be
-painted if both the \fB\-fill\fR and \fB\-outline\fR options were non-empty.
-.PP
-The following standard options are supported by ovals:
-.DS
-.ta 3i
-\fB\-dash\fR	\fB\-activedash\fR
-\fB\-disableddash\fR	\fB\-dashoffset\fR
-\fB\-fill\fR	\fB\-activefill\fR
-\fB\-disabledfill\fR	\fB\-offset\fR
-\fB\-outline\fR	\fB\-activeoutline\fR
-\fB\-disabledoutline\fR	\fB\-outlineoffset\fR
-\fB\-outlinestipple\fR	\fB\-activeoutlinestipple\fR
-\fB\-disabledoutlinestipple\fR	\fB\-stipple\fR
-\fB\-activestipple\fR	\fB\-disabledstipple\fR
-\fB\-state\fR	\fB\-tags\fR
-\fB\-width\fR	\fB\-activewidth\fR
-\fB\-disabledwidth\fR
-.DE
-There are no oval-specific options.
-.SS "POLYGON ITEMS"
-.PP
-Items of type \fBpolygon\fR appear as polygonal or curved filled regions
-on the display.
-Polygon items support coordinate indexing operations using the \fBdchars\fR,
-\fBindex\fR and \fBinsert\fR widget commands.
-Polygons are created with widget commands of the following form:
-.CS
-\fIpathName \fBcreate polygon \fIx1 y1 ... xn yn \fR?\fIoption value ...\fR?
-\fIpathName \fBcreate polygon \fIcoordList\fR ?\fIoption value ...\fR?
-.CE
-The arguments \fIx1\fR through \fIyn\fR or \fIcoordList\fR specify the coordinates for
-three or more points that define a polygon.
-The first point should not be repeated as the last to
-close the shape; Tk will automatically close the periphery between
-the first and last points.
-After the coordinates there may be any number of \fIoption\fR\-\fIvalue\fR
-pairs, each of which sets one of the configuration options
-for the item. These same \fIoption\fR\-\fIvalue\fR pairs may be
-used in \fBitemconfigure\fR widget commands to change the item's
-configuration. A polygon item is the current item whenever the mouse pointer
-is over any part of the polygon, whether drawn or not and whether or not the
-outline is smoothed.
-.PP
-The following standard options are supported by polygons:
-.DS
-.ta 3i
-\fB\-dash\fR	\fB\-activedash\fR
-\fB\-disableddash\fR	\fB\-dashoffset\fR
-\fB\-fill\fR	\fB\-activefill\fR
-\fB\-disabledfill\fR	\fB\-offset\fR
-\fB\-outline\fR	\fB\-activeoutline\fR
-\fB\-disabledoutline\fR	\fB\-outlineoffset\fR
-\fB\-outlinestipple\fR	\fB\-activeoutlinestipple\fR
-\fB\-disabledoutlinestipple\fR	\fB\-stipple\fR
-\fB\-activestipple\fR	\fB\-disabledstipple\fR
-\fB\-state\fR	\fB\-tags\fR
-\fB\-width\fR	\fB\-activewidth\fR
-\fB\-disabledwidth\fR
-.DE
-The following extra options are supported for polygons:
-.TP
-\fB\-joinstyle \fIstyle\fR
-Specifies the ways in which joints are to be drawn at the vertices
-of the outline.
-\fIStyle\fR may have any of the forms accepted by \fBTk_GetJoinStyle\fR
-(\fBbevel\fR, \fBmiter\fR, or \fBround\fR).
-If this option is not specified then it defaults to \fBround\fR.
-.TP
-\fB\-smooth \fIboolean\fR
-\fIBoolean\fR must have one of the forms accepted by \fBTcl_GetBoolean\fR
-or a line smoothing method. Only \fBtrue\fR and \fBraw\fR are
-supported in the core (with \fBbezier\fR being an alias for \fBtrue\fR), but more can be added at runtime. If a boolean
-false value or empty string is given, no smoothing is applied. A boolean
-truth value assumes \fBtrue\fR smoothing.
-If the smoothing method is \fBtrue\fR, this indicates that the polygon
-should be drawn as a curve, rendered as a set of quadratic splines: one spline
-is drawn for the first and second line segments, one for the second
-and third, and so on. Straight-line segments can be generated within
-a curve by duplicating the end-points of the desired line segment.
-If the smoothing method is \fBraw\fR, this indicates that the polygon
-should also be drawn as a curve but where the list of coordinates is
-such that the first coordinate pair (and every third coordinate pair
-thereafter) is a knot point on a cubic Bezier curve, and the other
-coordinates are control points on the cubic Bezier curve. Straight
-line segments can be venerated within a curve by making control points
-equal to their neighbouring knot points. If the last point is not the
-second point of a pair of control points, the point is repeated (one or two
-times) so that it also becomes the second point of a pair of control
-points (the associated knot point will be the first control point).
-.TP
-\fB\-splinesteps \fInumber\fR
-Specifies the degree of smoothness desired for curves: each spline
-will be approximated with \fInumber\fR line segments. This
-option is ignored unless the \fB\-smooth\fR option is true or \fBraw\fR.
-.PP
-Polygon items are different from other items such as rectangles, ovals
-and arcs in that interior points are considered to be
-.QW inside
-a polygon (e.g. for purposes of the \fBfind closest\fR and
-\fBfind overlapping\fR widget commands) even if it is not filled.
-For most other item types, an
-interior point is considered to be inside the item only if the item
-is filled or if it has neither a fill nor an outline. If you would
-like an unfilled polygon whose interior points are not considered
-to be inside the polygon, use a line item instead.
-.SS "RECTANGLE ITEMS"
-.PP
-Items of type \fBrectangle\fR appear as rectangular regions on
-the display. Each rectangle may have an outline, a fill, or
-both. Rectangles are created with widget commands of the
-following form:
-.CS
-\fIpathName \fBcreate rectangle \fIx1 y1 x2 y2 \fR?\fIoption value ...\fR?
-\fIpathName \fBcreate rectangle \fIcoordList\fR ?\fIoption value ...\fR?
-.CE
-The arguments \fIx1\fR, \fIy1\fR, \fIx2\fR, and \fIy2\fR or \fIcoordList\fR
-(which must have four elements) give
-the coordinates of two diagonally opposite corners of the rectangle
-(the rectangle will include its upper and left edges but not
-its lower or right edges).
-After the coordinates there may be any number of \fIoption\fR\-\fIvalue\fR
-pairs, each of which sets one of the configuration options
-for the item. These same \fIoption\fR\-\fIvalue\fR pairs may be
-used in \fBitemconfigure\fR widget commands to change the item's
-configuration. A rectangle item becomes the current item when the mouse
-pointer is over any part that is painted or (when fully transparent) that
-would be painted if both the \fB\-fill\fR and \fB\-outline\fR options were
-non-empty.
-.PP
-The following standard options are supported by rectangles:
-.DS
-.ta 3i
-\fB\-dash\fR	\fB\-activedash\fR
-\fB\-disableddash\fR	\fB\-dashoffset\fR
-\fB\-fill\fR	\fB\-activefill\fR
-\fB\-disabledfill\fR	\fB\-offset\fR
-\fB\-outline\fR	\fB\-activeoutline\fR
-\fB\-disabledoutline\fR	\fB\-outlineoffset\fR
-\fB\-outlinestipple\fR	\fB\-activeoutlinestipple\fR
-\fB\-disabledoutlinestipple\fR	\fB\-stipple\fR
-\fB\-activestipple\fR	\fB\-disabledstipple\fR
-\fB\-state\fR	\fB\-tags\fR
-\fB\-width\fR	\fB\-activewidth\fR
-\fB\-disabledwidth\fR
-.DE
-There are no rectangle-specific options.
-.SS "TEXT ITEMS"
-.PP
-A text item displays a string of characters on the screen in one
-or more lines.
-Text items support indexing, editing and selection through the \fBdchars\fR
-widget command, the \fBfocus\fR widget command, the \fBicursor\fR widget
-command, the \fBindex\fR widget command, the \fBinsert\fR widget command, and
-the \fBselect\fR widget command.
-Text items are created with widget commands of the following
-form:
-.CS
-\fIpathName \fBcreate text \fIx y \fR?\fIoption value ...\fR?
-\fIpathName \fBcreate text \fIcoordList\fR ?\fIoption value ...\fR?
-.CE
-The arguments \fIx\fR and \fIy\fR or \fIcoordList\fR (which must have two
-elements) specify the coordinates of a
-point used to position the text on the display (see the options
-below for more information on how text is displayed).
-After the coordinates there may be any number of \fIoption\fR\-\fIvalue\fR
-pairs, each of which sets one of the configuration options
-for the item. These same \fIoption\fR\-\fIvalue\fR pairs may be
-used in \fBitemconfigure\fR widget commands to change the item's
-configuration. A text item becomes the current item when the mouse pointer
-is over any part of its bounding box.
-.PP
-The following standard options are supported by text items:
-.DS
-.ta 3i
-\fB\-anchor\fR	\fB\-fill\fR
-\fB\-activefill\fR	\fB\-disabledfill\fR
-\fB\-stipple\fR	\fB\-activestipple\fR
-\fB\-disabledstipple\fR	\fB\-state\fR
-\fB\-tags\fR
-.DE
-The following extra options are supported for text items:
-.TP
-\fB\-angle \fIrotationDegrees\fR
-.VS 8.6
-\fIRotationDegrees\fR tells how many degrees to rotate the text anticlockwise
-about the positioning point for the text; it may have any floating-point value
-from 0.0 to 360.0. For example, if \fIrotationDegrees\fR is \fB90\fR, then the
-text will be drawn vertically from bottom to top.
-This option defaults to \fB0.0\fR.
-.VE 8.6
-.TP
-\fB\-font \fIfontName\fR
-Specifies the font to use for the text item.
-\fIFontName\fR may be any string acceptable to \fBTk_GetFont\fR.
-If this option is not specified, it defaults to a system-dependent
-font.
-.TP
-\fB\-justify \fIhow\fR
-Specifies how to justify the text within its bounding region.
-\fIHow\fR must be one of the values \fBleft\fR, \fBright\fR,
-or \fBcenter\fR.
-This option will only matter if the text is displayed as multiple
-lines.
-If the option is omitted, it defaults to \fBleft\fR.
-.TP
-\fB\-text \fIstring\fR
-\fIString\fR specifies the characters to be displayed in the text item.
-Newline characters cause line breaks.
-The characters in the item may also be changed with the
-\fBinsert\fR and \fBdelete\fR widget commands.
-This option defaults to an empty string.
-.TP
-\fB\-underline \fI\fR
-Specifies the integer index of a character within the text to be
-underlined. 0 corresponds to the first character of the text
-displayed, 1 to the next character, and so on. \-1 means that no
-underline should be drawn (if the whole text item is to be underlined,
-the appropriate font should be used instead).
-.TP
-\fB\-width \fIlineLength\fR
-Specifies a maximum line length for the text, in any of the forms
-described in the \fBCOORDINATES\fR section above.
-If this option is zero (the default) the text is broken into
-lines only at newline characters.
-However, if this option is non-zero then any line that would
-be longer than \fIlineLength\fR is broken just before a space
-character to make the line shorter than \fIlineLength\fR; the
-space character is treated as if it were a newline
-character.
-.SS "WINDOW ITEMS"
-.PP
-Items of type \fBwindow\fR cause a particular window to be displayed
-at a given position on the canvas.
-Window items are created with widget commands of the following form:
-.CS
-\fIpathName \fBcreate window \fIx y \fR?\fIoption value ...\fR?
-\fIpathName \fBcreate window \fIcoordList\fR ?\fIoption value ...\fR?
-.CE
-The arguments \fIx\fR and \fIy\fR or \fIcoordList\fR (which must have two
-elements) specify the coordinates of a
-point used to position the window on the display, as controlled by the
-\fB\-anchor\fR option.
-After the coordinates there may be any number of \fIoption\fR\-\fIvalue\fR
-pairs, each of which sets one of the configuration options
-for the item. These same \fIoption\fR\-\fIvalue\fR pairs may be
-used in \fBitemconfigure\fR widget commands to change the item's
-configuration. Theoretically, a window item becomes the current item when the
-mouse pointer is over any part of its bounding box, but in practice this
-typically does not happen because the mouse pointer ceases to be over the
-canvas at that point.
-.PP
-The following standard options are supported by window items:
-.DS
-.ta 3i
-\fB\-anchor\fR	\fB\-state\fR
-\fB\-tags\fR
-.DE
-The following extra options are supported for window items:
-.TP
-\fB\-height \fIpixels\fR
-.
-Specifies the height to assign to the item's window.
-\fIPixels\fR may have any of the
-forms described in the \fBCOORDINATES\fR section above.
-If this option is not specified, or if it is specified as zero,
-then the window is given whatever height it requests internally.
-.TP
-\fB\-width \fIpixels\fR
-.
-Specifies the width to assign to the item's window.
-\fIPixels\fR may have any of the
-forms described in the \fBCOORDINATES\fR section above.
-If this option is not specified, or if it is specified as zero,
-then the window is given whatever width it requests internally.
-.TP
-\fB\-window \fIpathName\fR
-.
-Specifies the window to associate with this item.
-The window specified by \fIpathName\fR must either be a child of
-the canvas widget or a child of some ancestor of the canvas widget.
-\fIPathName\fR may not refer to a top-level window.
-.PP
-Note: due to restrictions in the ways that windows are managed, it is not
-possible to draw other graphical items (such as lines and images) on top
-of window items. A window item always obscures any graphics that
-overlap it, regardless of their order in the display list. Also note that
-window items, unlike other canvas items, are not clipped for display by their
-containing canvas's border, and are instead clipped by the parent widget of
-the window specified by the \fB\-window\fR option; when the parent widget is
-the canvas, this means that the window item can overlap the canvas's border.
-.SH "APPLICATION-DEFINED ITEM TYPES"
-.PP
-It is possible for individual applications to define new item
-types for canvas widgets using C code.
-See the documentation for \fBTk_CreateItemType\fR.
-.SH BINDINGS
-.PP
-In the current implementation, new canvases are not given any
-default behavior: you will have to execute explicit Tcl commands
-to give the canvas its behavior.
-.SH CREDITS
-.PP
-Tk's canvas widget is a blatant ripoff of ideas from Joel Bartlett's
-\fIezd\fR program. \fIEzd\fR provides structured graphics in a Scheme
-environment and preceded canvases by a year or two. Its simple
-mechanisms for placing and animating graphical objects inspired the
-functions of canvases.
-.SH "SEE ALSO"
-bind(n), font(n), image(n), scrollbar(n)
-.SH KEYWORDS
-canvas, widget
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