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# Create a top-level window containing a canvas that displays the
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# various item types and allows them to be selected and moved. This
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# demo can be used to test out the point-hit and rectangle-hit code
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# w - Name to use for new top-level window.
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proc mkItems {{w .citems}} {
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wm title $w "Canvas Item Demonstration"
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wm iconname $w "Items"
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message $w.msg -font -Adobe-Times-Medium-R-Normal--*-180-* -width 13c \
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-bd 2 -relief raised -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."
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frame $w.frame2 -relief raised -bd 2
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button $w.ok -text "OK" -command "destroy $w"
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pack $w.msg -side top -fill x
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pack $w.frame2 -side top -fill both -expand yes
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pack $w.ok -side bottom -pady 5 -anchor center
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canvas $c -scrollregion {0c 0c 30c 24c} -width 15c -height 10c \
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-xscroll "$w.frame2.hscroll set" -yscroll "$w.frame2.vscroll set"
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scrollbar $w.frame2.vscroll -relief sunken -command "$c yview"
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scrollbar $w.frame2.hscroll -orient horiz -relief sunken -command "$c xview"
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pack $w.frame2.hscroll -side bottom -fill x
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pack $w.frame2.vscroll -side right -fill y
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pack $c -in $w.frame2 -expand yes -fill both
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# Display a 3x3 rectangular grid.
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$c create rect 0c 0c 30c 24c -width 2
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$c create line 0c 8c 30c 8c -width 2
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$c create line 0c 16c 30c 16c -width 2
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$c create line 10c 0c 10c 24c -width 2
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$c create line 20c 0c 20c 24c -width 2
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set font1 -Adobe-Helvetica-Medium-R-Normal--*-120-*
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set font2 -Adobe-Helvetica-Bold-R-Normal--*-240-*
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if {[tk colormodel $c] == "color"} {
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# Set up demos within each of the areas of the grid.
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$c create text 5c .2c -text Lines -anchor n
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$c create line 1c 1c 3c 1c 1c 4c 3c 4c -width 2m -fill $blue \
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-cap butt -join miter -tags item
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$c create line 4.67c 1c 4.67c 4c -arrow last -tags item
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$c create line 6.33c 1c 6.33c 4c -arrow both -tags item
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$c create line 5c 6c 9c 6c 9c 1c 8c 1c 8c 4.8c 8.8c 4.8c 8.8c 1.2c \
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8.2c 1.2c 8.2c 4.6c 8.6c 4.6c 8.6c 1.4c 8.4c 1.4c 8.4c 4.4c \
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-width 3 -fill $red -tags item
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$c create line 1c 5c 7c 5c 7c 7c 9c 7c -width .5c \
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-stipple @$tk_library/demos/bitmaps/grey.25 \
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-arrow both -arrowshape {15 15 7} -tags item
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$c create line 1c 7c 1.75c 5.8c 2.5c 7c 3.25c 5.8c 4c 7c -width .5c \
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-cap round -join round -tags item
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$c create text 15c .2c -text "Curves (smoothed lines)" -anchor n
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$c create line 11c 4c 11.5c 1c 13.5c 1c 14c 4c -smooth on \
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-fill $blue -tags item
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$c create line 15.5c 1c 19.5c 1.5c 15.5c 4.5c 19.5c 4c -smooth on \
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-arrow both -width 3 -tags item
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$c create line 12c 6c 13.5c 4.5c 16.5c 7.5c 18c 6c \
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16.5c 4.5c 13.5c 7.5c 12c 6c -smooth on -width 3m -cap round \
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-stipple @$tk_library/demos/bitmaps/grey.25 -fill $red -tags item
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$c create text 25c .2c -text Polygons -anchor n
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$c create polygon 21c 1.0c 22.5c 1.75c 24c 1.0c 23.25c 2.5c \
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24c 4.0c 22.5c 3.25c 21c 4.0c 21.75c 2.5c -fill $green -tags item
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$c create polygon 25c 4c 25c 4c 25c 1c 26c 1c 27c 4c 28c 1c \
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29c 1c 29c 4c 29c 4c -fill $red -smooth on -tags item
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$c create polygon 22c 4.5c 25c 4.5c 25c 6.75c 28c 6.75c \
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28c 5.25c 24c 5.25c 24c 6.0c 26c 6c 26c 7.5c 22c 7.5c \
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-stipple @$tk_library/demos/bitmaps/grey.25 -tags item
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$c create text 5c 8.2c -text Rectangles -anchor n
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$c create rectangle 1c 9.5c 4c 12.5c -outline $red -width 3m -tags item
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$c create rectangle 0.5c 13.5c 4.5c 15.5c -fill $green -tags item
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$c create rectangle 6c 10c 9c 15c -outline {} \
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-stipple @$tk_library/demos/bitmaps/grey.25 -fill $blue -tags item
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$c create text 15c 8.2c -text Ovals -anchor n
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$c create oval 11c 9.5c 14c 12.5c -outline $red -width 3m -tags item
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$c create oval 10.5c 13.5c 14.5c 15.5c -fill $green -tags item
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$c create oval 16c 10c 19c 15c -outline {} \
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-stipple @$tk_library/demos/bitmaps/grey.25 -fill $blue -tags item
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$c create text 25c 8.2c -text Text -anchor n
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$c create rectangle 22.4c 8.9c 22.6c 9.1c
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$c create text 22.5c 9c -anchor n -font $font1 -width 4c \
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-text "A short string of text, word-wrapped, justified left, and anchored north (at the top). The rectangles show the anchor points for each piece of text." -tags item
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$c create rectangle 25.4c 10.9c 25.6c 11.1c
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$c create text 25.5c 11c -anchor w -font $font1 -fill $blue \
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-text "Several lines,\n each centered\nindividually,\nand all anchored\nat the left edge." \
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-justify center -tags item
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$c create rectangle 24.9c 13.9c 25.1c 14.1c
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$c create text 25c 14c -font $font2 -anchor c -fill $red \
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-stipple @$tk_library/demos/bitmaps/grey.5 \
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-text "Stippled characters" -tags item
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$c create text 5c 16.2c -text Arcs -anchor n
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$c create arc 0.5c 17c 7c 20c -fill $green -outline black \
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-start 45 -extent 270 -style pieslice -tags item
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$c create arc 6.5c 17c 9.5c 20c -width 4m -style arc \
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-fill $blue -start -135 -extent 270 \
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-stipple @$tk_library/demos/bitmaps/grey.25 -tags item
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$c create arc 0.5c 20c 9.5c 24c -width 4m -style pieslice \
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-fill {} -outline $red -start 225 -extent -90 -tags item
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$c create arc 5.5c 20.5c 9.5c 23.5c -width 4m -style chord \
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-fill $blue -outline {} -start 45 -extent 270 -tags item
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$c create text 15c 16.2c -text Bitmaps -anchor n
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$c create bitmap 13c 20c -bitmap @$tk_library/demos/bitmaps/face -tags item
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$c create bitmap 17c 18.5c \
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-bitmap @$tk_library/demos/bitmaps/noletters -tags item
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$c create bitmap 17c 21.5c \
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-bitmap @$tk_library/demos/bitmaps/letters -tags item
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$c create text 25c 16.2c -text Windows -anchor n
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button $c.button -text "Press Me" -command "butPress $c $red"
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$c create window 21c 18c -window $c.button -anchor nw -tags item
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entry $c.entry -width 20 -relief sunken
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$c.entry insert end "Edit this text"
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$c create window 21c 21c -window $c.entry -anchor nw -tags item
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scale $c.scale -from 0 -to 100 -length 6c -sliderlength .4c \
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-width .5c -tickinterval 0
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$c create window 28.5c 17.5c -window $c.scale -anchor n -tags item
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$c create text 21c 17.9c -text Button: -anchor sw
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$c create text 21c 20.9c -text Entry: -anchor sw
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$c create text 28.5c 17.4c -text Scale: -anchor s
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# Set up event bindings for canvas:
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$c bind item <Any-Enter> "itemEnter $c"
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$c bind item <Any-Leave> "itemLeave $c"
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bind $c <2> "$c scan mark %x %y"
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bind $c <B2-Motion> "$c scan dragto %x %y"
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bind $c <3> "itemMark $c %x %y"
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bind $c <B3-Motion> "itemStroke $c %x %y"
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bind $c <Control-f> "itemsUnderArea $c"
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bind $c <1> "itemStartDrag $c %x %y"
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bind $c <B1-Motion> "itemDrag $c %x %y"
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bind $w <Any-Enter> "focus $c"
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# Utility procedures for highlighting the item under the pointer:
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if {[tk colormodel $c] != "color"} {
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set type [$c type current]
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if {$type == "window"} {
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if {$type == "bitmap"} {
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set bg [lindex [$c itemconf current -background] 4]
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set restoreCmd [list $c itemconfig current -background $bg]
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$c itemconfig current -background SteelBlue2
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set fill [lindex [$c itemconfig current -fill] 4]
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if {(($type == "rectangle") || ($type == "oval") || ($type == "arc"))
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set outline [lindex [$c itemconfig current -outline] 4]
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set restoreCmd "$c itemconfig current -outline $outline"
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$c itemconfig current -outline SteelBlue2
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set restoreCmd "$c itemconfig current -fill $fill"
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$c itemconfig current -fill SteelBlue2
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# Utility procedures for stroking out a rectangle and printing what's
202
# underneath the rectangle's area.
204
proc itemMark {c x y} {
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set areaX1 [$c canvasx $x]
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set areaY1 [$c canvasy $y]
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proc itemStroke {c x y} {
212
global areaX1 areaY1 areaX2 areaY2
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set x [$c canvasx $x]
214
set y [$c canvasy $y]
215
if {($areaX1 != $x) && ($areaY1 != $y)} {
217
$c addtag area withtag [$c create rect $areaX1 $areaY1 $x $y \
224
proc itemsUnderArea {c} {
225
global areaX1 areaY1 areaX2 areaY2
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set area [$c find withtag area]
228
foreach i [$c find enclosed $areaX1 $areaY1 $areaX2 $areaY2] {
229
if {[lsearch [$c gettags $i] item] != -1} {
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puts stdout "Items enclosed by area: $items"
235
foreach i [$c find overlapping $areaX1 $areaY1 $areaX2 $areaY2] {
236
if {[lsearch [$c gettags $i] item] != -1} {
240
puts stdout "Items overlapping area: $items"
248
# Utility procedures to support dragging of items.
250
proc itemStartDrag {c x y} {
252
set lastX [$c canvasx $x]
253
set lastY [$c canvasy $y]
256
proc itemDrag {c x y} {
258
set x [$c canvasx $x]
259
set y [$c canvasy $y]
260
$c move current [expr $x-$lastX] [expr $y-$lastY]
265
# Procedure that's invoked when the button embedded in the canvas
268
proc butPress {w color} {
269
set i [$w create text 25c 18.1c -text "Ouch!!" -fill $color -anchor n]
270
after 500 "$w delete $i"
added
removed
gcl-tk/demos/mkItems.tcl
