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-'\"
-'\" Copyright (c) 1996 Sun Microsystems, Inc.
-'\"
-'\" See the file "license.terms" for information on usage and redistribution
-'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-'\"
-.TH Tk_MeasureChars 3 8.1 Tk "Tk Library Procedures"
-.so man.macros
-.BS
-.SH NAME
-Tk_MeasureChars, Tk_TextWidth, Tk_DrawChars, Tk_UnderlineChars \- routines to measure and display simple single-line strings.
-.SH SYNOPSIS
-.nf
-\fB#include <tk.h>\fR
-.sp
-int
-\fBTk_MeasureChars(\fItkfont, string, numBytes, maxPixels, flags, lengthPtr\fB)\fR
-.sp
-int
-\fBTk_TextWidth(\fItkfont, string, numBytes\fB)\fR
-.sp
-\fBTk_DrawChars(\fIdisplay, drawable, gc, tkfont, string, numBytes, x, y\fB)\fR
-.sp
-\fBTk_UnderlineChars(\fIdisplay, drawable, gc, tkfont, string, x, y, firstByte, lastByte\fB)\fR
-.sp
-.SH ARGUMENTS
-.AS "const char" firstChar
-.AP Tk_Font tkfont in
-Token for font in which text is to be drawn or measured.  Must have been
-returned by a previous call to \fBTk_GetFont\fR.
-.AP "const char" *string in
-Text to be measured or displayed.  Need not be null terminated.  Any
-non-printing meta-characters in the string (such as tabs, newlines, and
-other control characters) will be measured or displayed in a
-platform-dependent manner.
-.AP int numBytes in
-The maximum number of bytes to consider when measuring or drawing
-\fIstring\fR.  Must be greater than or equal to 0.
-.AP int maxPixels in
-If \fImaxPixels\fR is >= 0, it specifies the longest permissible
-line length in pixels.  Characters from \fIstring\fR are processed only
-until this many pixels have been covered.  If \fImaxPixels\fR is < 0, then
-the line length is unbounded and the \fIflags\fR argument is ignored.
-.AP int flags in
-Various flag bits OR-ed together: \fBTK_PARTIAL_OK\fR means include a character
-as long as any part of it fits in the length given by \fImaxPixels\fR;
-otherwise, a character must fit completely to be considered.
-\fBTK_WHOLE_WORDS\fR means stop on a word boundary, if possible.  If
-\fBTK_AT_LEAST_ONE\fR is set, it means return at least one character even if no
-characters could fit in the length given by \fImaxPixels\fR.  If
-\fBTK_AT_LEAST_ONE\fR is set and \fBTK_WHOLE_WORDS\fR is also set, it means that if
-not even one word fits on the line, return the first few letters of the
-word that did fit; if not even one letter of the word fit, then the first
-letter will still be returned.
-.AP int *lengthPtr out
-Filled with the number of pixels occupied by the number of characters
-returned as the result of \fBTk_MeasureChars\fR.
-.AP Display *display in
-Display on which to draw.
-.AP Drawable drawable in
-Window or pixmap in which to draw.
-.AP GC gc in
-Graphics context for drawing characters.  The font selected into this GC
-must be the same as the \fItkfont\fR.
-.AP int "x, y" in
-Coordinates at which to place the left edge of the baseline when displaying
-\fIstring\fR.
-.AP int firstByte in
-The index of the first byte of the first character to underline in the
-\fIstring\fR.  Underlining begins at the left edge of this character.
-.AP int lastByte in
-The index of the first byte of the last character up to which the
-underline will be drawn.  The character specified by \fIlastByte\fR
-will not itself be underlined.
-.BE
-.SH DESCRIPTION
-.PP
-These routines are for measuring and displaying simple single-font,
-single-line strings.  To measure and display single-font, multi-line,
-justified text, refer to the documentation for \fBTk_ComputeTextLayout\fR.
-There is no programming interface in the core of Tk that supports
-multi-font, multi-line text; support for that behavior must be built on
-top of simpler layers.
-Note that the interfaces described here are
-byte-oriented not character-oriented, so index values coming from Tcl
-scripts need to be converted to byte offsets using the
-\fBTcl_UtfAtIndex\fR and related routines.
-.PP
-A glyph is the displayable picture of a letter, number, or some other
-symbol.  Not all character codes in a given font have a glyph.
-Characters such as tabs, newlines/returns, and control characters that
-have no glyph are measured and displayed by these procedures in a
-platform-dependent manner; under X, they are replaced with backslashed
-escape sequences, while under Windows and Macintosh hollow or solid boxes
-may be substituted.  Refer to the documentation for
-\fBTk_ComputeTextLayout\fR for a programming interface that supports the
-platform-independent expansion of tab characters into columns and
-newlines/returns into multi-line text.
-.PP
-\fBTk_MeasureChars\fR is used both to compute the length of a given
-string and to compute how many characters from a string fit in a given
-amount of space.  The return value is the number of bytes from
-\fIstring\fR that fit in the space specified by \fImaxPixels\fR subject to
-the conditions described by \fIflags\fR.  If all characters fit, the return
-value will be \fInumBytes\fR.  \fI*lengthPtr\fR is filled with the computed
-width, in pixels, of the portion of the string that was measured.  For
-example, if the return value is 5, then \fI*lengthPtr\fR is filled with the
-distance between the left edge of \fIstring\fR[0] and the right edge of
-\fIstring\fR[4].
-.PP
-\fBTk_TextWidth\fR is a wrapper function that provides a simpler interface
-to the \fBTk_MeasureChars\fR function.  The return value is how much
-space in pixels the given \fIstring\fR needs.
-.PP
-\fBTk_DrawChars\fR draws the \fIstring\fR at the given location in the
-given \fIdrawable\fR.
-.PP
-\fBTk_UnderlineChars\fR underlines the given range of characters in the
-given \fIstring\fR.  It does not draw the characters (which are assumed to
-have been displayed previously by \fBTk_DrawChars\fR); it just draws the
-underline.  This procedure is used to underline a few characters without
-having to construct an underlined font.  To produce natively underlined
-text, the appropriate underlined font should be constructed and used.
-.SH "SEE ALSO"
-font(n), FontId(3)
-.SH KEYWORDS
-font, measurement