- # items.tcl --
- #
- # This demonstration script creates a canvas that displays the
- # canvas item types.
- #
- # RCS: @(#) $Id: items.tcl,v 1.3 2001/06/14 10:56:58 dkf Exp $
- if {![info exists widgetDemo]} {
- error "This script should be run from the "widget" demo."
- }
- 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:ttprints items under area."
- pack $w.msg -side top
- frame $w.buttons
- pack $w.buttons -side bottom -fill x -pady 2m
- button $w.buttons.dismiss -text Dismiss -command "destroy $w"
- button $w.buttons.code -text "See Code" -command "showCode $w"
- pack $w.buttons.dismiss $w.buttons.code -side left -expand 1
- 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"
- scrollbar $w.frame.vscroll -command "$c yview"
- 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
- $c create line 1c 5c 7c 5c 7c 7c 9c 7c -width .5c
- -stipple @[file join $tk_library demos images gray25.bmp]
- -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_library demos images gray25.bmp]
- -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_library demos images gray25.bmp]
- -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_library demos images gray25.bmp]
- -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_library demos images gray25.bmp]
- -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 centerednindividually,nand all anchorednat 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 -stipple gray50
- -text "Stippled 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_library demos images gray25.bmp]
- $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
- $c create text 15c 16.2c -text Bitmaps -anchor n
- $c create bitmap 13c 20c -tags item
- -bitmap @[file join $tk_library demos images face.bmp]
- $c create bitmap 17c 18.5c -tags item
- -bitmap @[file join $tk_library demos images noletter.bmp]
- $c create bitmap 17c 21.5c -tags item
- -bitmap @[file join $tk_library demos images letters.bmp]
- $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 <Control-f> "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 {$type == "window"} {
- set restoreCmd {}
- return
- }
- if {$type == "bitmap"} {
- set bg [lindex [$c itemconf current -background] 4]
- set restoreCmd [list $c itemconfig current -background $bg]
- $c itemconfig current -background SteelBlue2
- return
- }
- set fill [lindex [$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 "Ouch!!" -fill $color -anchor n]
- after 500 "$w delete $i"
- }