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| # 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 Left-Button drag:\tmoves item under pointer.\n Middle-Button drag:\trepositions view.\n Right-Button 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 {} -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 -outline {} -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] \ | |
| -fill $blue -outline {} -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 | |
| catch { | |
| $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 | |
| $c create text 15c 16.2c -text "Bitmaps and Images" -anchor n | |
| catch { | |
| 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 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 <Enter> "itemEnter $c" | |
| $c bind item <Leave> "itemLeave $c" | |
| if {[tk windowingsystem] eq "aqua" && ![package vsatisfies [package provide Tk] 8.7-]} { | |
| bind $c <Button-2> "itemMark $c %x %y" | |
| bind $c <B2-Motion> "itemStroke $c %x %y" | |
| bind $c <Button-3> "$c scan mark %x %y" | |
| bind $c <B3-Motion> "$c scan dragto %x %y" | |
| } else { | |
| bind $c <Button-2> "$c scan mark %x %y" | |
| bind $c <B2-Motion> "$c scan dragto %x %y" | |
| bind $c <Button-3> "itemMark $c %x %y" | |
| bind $c <B3-Motion> "itemStroke $c %x %y" | |
| } | |
| bind $c <<NextChar>> "itemsUnderArea $c" | |
| bind $c <Button-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] >= 0} { | |
| 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] >= 0} { | |
| 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" | |
| } | |