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Diffstat (limited to 'tk8.6/library/demos/items.tcl')
| -rw-r--r-- | tk8.6/library/demos/items.tcl | 291 |
1 files changed, 291 insertions, 0 deletions
diff --git a/tk8.6/library/demos/items.tcl b/tk8.6/library/demos/items.tcl new file mode 100644 index 0000000..000e4cb --- /dev/null +++ b/tk8.6/library/demos/items.tcl @@ -0,0 +1,291 @@ +# items.tcl -- +# +# This demonstration script creates a canvas that displays the +# canvas item types. + +if {![info exists widgetDemo]} { + error "This script should be run from the \"widget\" demo." +} + +package require Tk + +set w .items +catch {destroy $w} +toplevel $w +wm title $w "Canvas Item Demonstration" +wm iconname $w "Items" +positionWindow $w +set c $w.frame.c + +label $w.msg -font $font -wraplength 5i -justify left -text "This window contains a canvas widget with examples of the various kinds of items supported by canvases. The following operations are supported:\n Button-1 drag:\tmoves item under pointer.\n Button-2 drag:\trepositions view.\n Button-3 drag:\tstrokes out area.\n Ctrl+f:\t\tprints items under area." +pack $w.msg -side top + +## See Code / Dismiss buttons +set btns [addSeeDismiss $w.buttons $w] +pack $btns -side bottom -fill x + +frame $w.frame +pack $w.frame -side top -fill both -expand yes + +canvas $c -scrollregion {0c 0c 30c 24c} -width 15c -height 10c \ + -relief sunken -borderwidth 2 \ + -xscrollcommand "$w.frame.hscroll set" \ + -yscrollcommand "$w.frame.vscroll set" +ttk::scrollbar $w.frame.vscroll -command "$c yview" +ttk::scrollbar $w.frame.hscroll -orient horiz -command "$c xview" + +grid $c -in $w.frame \ + -row 0 -column 0 -rowspan 1 -columnspan 1 -sticky news +grid $w.frame.vscroll \ + -row 0 -column 1 -rowspan 1 -columnspan 1 -sticky news +grid $w.frame.hscroll \ + -row 1 -column 0 -rowspan 1 -columnspan 1 -sticky news +grid rowconfig $w.frame 0 -weight 1 -minsize 0 +grid columnconfig $w.frame 0 -weight 1 -minsize 0 + +# Display a 3x3 rectangular grid. + +$c create rect 0c 0c 30c 24c -width 2 +$c create line 0c 8c 30c 8c -width 2 +$c create line 0c 16c 30c 16c -width 2 +$c create line 10c 0c 10c 24c -width 2 +$c create line 20c 0c 20c 24c -width 2 + +set font1 {Helvetica 12} +set font2 {Helvetica 24 bold} +if {[winfo depth $c] > 1} { + set blue DeepSkyBlue3 + set red red + set bisque bisque3 + set green SeaGreen3 +} else { + set blue black + set red black + set bisque black + set green black +} + +# Set up demos within each of the areas of the grid. + +$c create text 5c .2c -text Lines -anchor n +$c create line 1c 1c 3c 1c 1c 4c 3c 4c -width 2m -fill $blue \ + -cap butt -join miter -tags item +$c create line 4.67c 1c 4.67c 4c -arrow last -tags item +$c create line 6.33c 1c 6.33c 4c -arrow both -tags item +$c create line 5c 6c 9c 6c 9c 1c 8c 1c 8c 4.8c 8.8c 4.8c 8.8c 1.2c \ + 8.2c 1.2c 8.2c 4.6c 8.6c 4.6c 8.6c 1.4c 8.4c 1.4c 8.4c 4.4c \ + -width 3 -fill $red -tags item +# Main widget program sets variable tk_demoDirectory +$c create line 1c 5c 7c 5c 7c 7c 9c 7c -width .5c \ + -stipple @[file join $tk_demoDirectory images gray25.xbm] \ + -arrow both -arrowshape {15 15 7} -tags item +$c create line 1c 7c 1.75c 5.8c 2.5c 7c 3.25c 5.8c 4c 7c -width .5c \ + -cap round -join round -tags item + +$c create text 15c .2c -text "Curves (smoothed lines)" -anchor n +$c create line 11c 4c 11.5c 1c 13.5c 1c 14c 4c -smooth on \ + -fill $blue -tags item +$c create line 15.5c 1c 19.5c 1.5c 15.5c 4.5c 19.5c 4c -smooth on \ + -arrow both -width 3 -tags item +$c create line 12c 6c 13.5c 4.5c 16.5c 7.5c 18c 6c \ + 16.5c 4.5c 13.5c 7.5c 12c 6c -smooth on -width 3m -cap round \ + -stipple @[file join $tk_demoDirectory images gray25.xbm] \ + -fill $red -tags item + +$c create text 25c .2c -text Polygons -anchor n +$c create polygon 21c 1.0c 22.5c 1.75c 24c 1.0c 23.25c 2.5c \ + 24c 4.0c 22.5c 3.25c 21c 4.0c 21.75c 2.5c -fill $green \ + -outline black -width 4 -tags item +$c create polygon 25c 4c 25c 4c 25c 1c 26c 1c 27c 4c 28c 1c \ + 29c 1c 29c 4c 29c 4c -fill $red -smooth on -tags item +$c create polygon 22c 4.5c 25c 4.5c 25c 6.75c 28c 6.75c \ + 28c 5.25c 24c 5.25c 24c 6.0c 26c 6c 26c 7.5c 22c 7.5c \ + -stipple @[file join $tk_demoDirectory images gray25.xbm] \ + -outline black -tags item + +$c create text 5c 8.2c -text Rectangles -anchor n +$c create rectangle 1c 9.5c 4c 12.5c -outline $red -width 3m -tags item +$c create rectangle 0.5c 13.5c 4.5c 15.5c -fill $green -tags item +$c create rectangle 6c 10c 9c 15c -outline {} \ + -stipple @[file join $tk_demoDirectory images gray25.xbm] \ + -fill $blue -tags item + +$c create text 15c 8.2c -text Ovals -anchor n +$c create oval 11c 9.5c 14c 12.5c -outline $red -width 3m -tags item +$c create oval 10.5c 13.5c 14.5c 15.5c -fill $green -tags item +$c create oval 16c 10c 19c 15c -outline {} \ + -stipple @[file join $tk_demoDirectory images gray25.xbm] \ + -fill $blue -tags item + +$c create text 25c 8.2c -text Text -anchor n +$c create rectangle 22.4c 8.9c 22.6c 9.1c +$c create text 22.5c 9c -anchor n -font $font1 -width 4c \ + -text "A short string of text, word-wrapped, justified left, and anchored north (at the top). The rectangles show the anchor points for each piece of text." -tags item +$c create rectangle 25.4c 10.9c 25.6c 11.1c +$c create text 25.5c 11c -anchor w -font $font1 -fill $blue \ + -text "Several lines,\n each centered\nindividually,\nand all anchored\nat the left edge." \ + -justify center -tags item +$c create rectangle 24.9c 13.9c 25.1c 14.1c +$c create text 25c 14c -font $font2 -anchor c -fill $red -angle 15 \ + -text "Angled characters" -tags item + +$c create text 5c 16.2c -text Arcs -anchor n +$c create arc 0.5c 17c 7c 20c -fill $green -outline black \ + -start 45 -extent 270 -style pieslice -tags item +$c create arc 6.5c 17c 9.5c 20c -width 4m -style arc \ + -outline $blue -start -135 -extent 270 -tags item \ + -outlinestipple @[file join $tk_demoDirectory images gray25.xbm] +$c create arc 0.5c 20c 9.5c 24c -width 4m -style pieslice \ + -fill {} -outline $red -start 225 -extent -90 -tags item +$c create arc 5.5c 20.5c 9.5c 23.5c -width 4m -style chord \ + -fill $blue -outline {} -start 45 -extent 270 -tags item + +image create photo items.ousterhout \ + -file [file join $tk_demoDirectory images ouster.png] +image create photo items.ousterhout.active -format "png -alpha 0.5" \ + -file [file join $tk_demoDirectory images ouster.png] +$c create text 15c 16.2c -text "Bitmaps and Images" -anchor n +$c create image 13c 20c -tags item -image items.ousterhout \ + -activeimage items.ousterhout.active +$c create bitmap 17c 18.5c -tags item \ + -bitmap @[file join $tk_demoDirectory images noletter.xbm] +$c create bitmap 17c 21.5c -tags item \ + -bitmap @[file join $tk_demoDirectory images letters.xbm] + +$c create text 25c 16.2c -text Windows -anchor n +button $c.button -text "Press Me" -command "butPress $c $red" +$c create window 21c 18c -window $c.button -anchor nw -tags item +entry $c.entry -width 20 -relief sunken +$c.entry insert end "Edit this text" +$c create window 21c 21c -window $c.entry -anchor nw -tags item +scale $c.scale -from 0 -to 100 -length 6c -sliderlength .4c \ + -width .5c -tickinterval 0 +$c create window 28.5c 17.5c -window $c.scale -anchor n -tags item +$c create text 21c 17.9c -text Button: -anchor sw +$c create text 21c 20.9c -text Entry: -anchor sw +$c create text 28.5c 17.4c -text Scale: -anchor s + +# Set up event bindings for canvas: + +$c bind item <Any-Enter> "itemEnter $c" +$c bind item <Any-Leave> "itemLeave $c" +bind $c <2> "$c scan mark %x %y" +bind $c <B2-Motion> "$c scan dragto %x %y" +bind $c <3> "itemMark $c %x %y" +bind $c <B3-Motion> "itemStroke $c %x %y" +bind $c <<NextChar>> "itemsUnderArea $c" +bind $c <1> "itemStartDrag $c %x %y" +bind $c <B1-Motion> "itemDrag $c %x %y" + +# Utility procedures for highlighting the item under the pointer: + +proc itemEnter {c} { + global restoreCmd + + if {[winfo depth $c] == 1} { + set restoreCmd {} + return + } + set type [$c type current] + if {$type == "window" || $type == "image"} { + set restoreCmd {} + return + } elseif {$type == "bitmap"} { + set bg [lindex [$c itemconf current -background] 4] + set restoreCmd [list $c itemconfig current -background $bg] + $c itemconfig current -background SteelBlue2 + return + } elseif {$type == "image"} { + set restoreCmd [list $c itemconfig current -state normal] + $c itemconfig current -state active + return + } + set fill [lindex [$c itemconfig current -fill] 4] + if {(($type == "rectangle") || ($type == "oval") || ($type == "arc")) + && ($fill == "")} { + set outline [lindex [$c itemconfig current -outline] 4] + set restoreCmd "$c itemconfig current -outline $outline" + $c itemconfig current -outline SteelBlue2 + } else { + set restoreCmd "$c itemconfig current -fill $fill" + $c itemconfig current -fill SteelBlue2 + } +} + +proc itemLeave {c} { + global restoreCmd + + eval $restoreCmd +} + +# Utility procedures for stroking out a rectangle and printing what's +# underneath the rectangle's area. + +proc itemMark {c x y} { + global areaX1 areaY1 + set areaX1 [$c canvasx $x] + set areaY1 [$c canvasy $y] + $c delete area +} + +proc itemStroke {c x y} { + global areaX1 areaY1 areaX2 areaY2 + set x [$c canvasx $x] + set y [$c canvasy $y] + if {($areaX1 != $x) && ($areaY1 != $y)} { + $c delete area + $c addtag area withtag [$c create rect $areaX1 $areaY1 $x $y \ + -outline black] + set areaX2 $x + set areaY2 $y + } +} + +proc itemsUnderArea {c} { + global areaX1 areaY1 areaX2 areaY2 + set area [$c find withtag area] + set items "" + foreach i [$c find enclosed $areaX1 $areaY1 $areaX2 $areaY2] { + if {[lsearch [$c gettags $i] item] != -1} { + lappend items $i + } + } + puts stdout "Items enclosed by area: $items" + set items "" + foreach i [$c find overlapping $areaX1 $areaY1 $areaX2 $areaY2] { + if {[lsearch [$c gettags $i] item] != -1} { + lappend items $i + } + } + puts stdout "Items overlapping area: $items" +} + +set areaX1 0 +set areaY1 0 +set areaX2 0 +set areaY2 0 + +# Utility procedures to support dragging of items. + +proc itemStartDrag {c x y} { + global lastX lastY + set lastX [$c canvasx $x] + set lastY [$c canvasy $y] +} + +proc itemDrag {c x y} { + global lastX lastY + set x [$c canvasx $x] + set y [$c canvasy $y] + $c move current [expr {$x-$lastX}] [expr {$y-$lastY}] + set lastX $x + set lastY $y +} + +# Procedure that's invoked when the button embedded in the canvas +# is invoked. + +proc butPress {w color} { + set i [$w create text 25c 18.1c -text "Oooohhh!!" -fill $color -anchor n] + after 500 "$w delete $i" +} |