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292 lines
9.9 KiB
292 lines
9.9 KiB
6 years ago
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# items.tcl --
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#
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# This demonstration script creates a canvas that displays the
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# canvas item types.
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if {![info exists widgetDemo]} {
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error "This script should be run from the \"widget\" demo."
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}
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package require Tk
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set w .items
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catch {destroy $w}
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toplevel $w
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wm title $w "Canvas Item Demonstration"
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wm iconname $w "Items"
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positionWindow $w
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set c $w.frame.c
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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."
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pack $w.msg -side top
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## See Code / Dismiss buttons
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set btns [addSeeDismiss $w.buttons $w]
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pack $btns -side bottom -fill x
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frame $w.frame
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pack $w.frame -side top -fill both -expand yes
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canvas $c -scrollregion {0c 0c 30c 24c} -width 15c -height 10c \
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-relief sunken -borderwidth 2 \
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-xscrollcommand "$w.frame.hscroll set" \
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-yscrollcommand "$w.frame.vscroll set"
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ttk::scrollbar $w.frame.vscroll -command "$c yview"
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ttk::scrollbar $w.frame.hscroll -orient horiz -command "$c xview"
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grid $c -in $w.frame \
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-row 0 -column 0 -rowspan 1 -columnspan 1 -sticky news
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grid $w.frame.vscroll \
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-row 0 -column 1 -rowspan 1 -columnspan 1 -sticky news
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grid $w.frame.hscroll \
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-row 1 -column 0 -rowspan 1 -columnspan 1 -sticky news
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grid rowconfig $w.frame 0 -weight 1 -minsize 0
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grid columnconfig $w.frame 0 -weight 1 -minsize 0
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# Display a 3x3 rectangular grid.
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$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 {Helvetica 12}
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set font2 {Helvetica 24 bold}
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if {[winfo depth $c] > 1} {
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set blue DeepSkyBlue3
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set red red
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set bisque bisque3
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set green SeaGreen3
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} else {
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set blue black
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set red black
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set bisque black
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set green black
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}
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# Set up demos within each of the areas of the grid.
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$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 $red -tags item
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# Main widget program sets variable tk_demoDirectory
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$c create line 1c 5c 7c 5c 7c 7c 9c 7c -width .5c \
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-stipple @[file join $tk_demoDirectory images gray25.xbm] \
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-arrow both -arrowshape {15 15 7} -tags item
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$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 @[file join $tk_demoDirectory images gray25.xbm] \
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-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 $green \
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-outline black -width 4 -tags item
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$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 @[file join $tk_demoDirectory images gray25.xbm] \
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-outline black -tags item
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$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 @[file join $tk_demoDirectory images gray25.xbm] \
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-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 @[file join $tk_demoDirectory images gray25.xbm] \
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-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 $red -angle 15 \
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-text "Angled characters" -tags item
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$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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-outline $blue -start -135 -extent 270 -tags item \
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-outlinestipple @[file join $tk_demoDirectory images gray25.xbm]
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$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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image create photo items.ousterhout \
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-file [file join $tk_demoDirectory images ouster.png]
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image create photo items.ousterhout.active -format "png -alpha 0.5" \
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-file [file join $tk_demoDirectory images ouster.png]
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$c create text 15c 16.2c -text "Bitmaps and Images" -anchor n
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$c create image 13c 20c -tags item -image items.ousterhout \
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-activeimage items.ousterhout.active
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$c create bitmap 17c 18.5c -tags item \
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-bitmap @[file join $tk_demoDirectory images noletter.xbm]
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$c create bitmap 17c 21.5c -tags item \
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-bitmap @[file join $tk_demoDirectory images letters.xbm]
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$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 <<NextChar>> "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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# Utility procedures for highlighting the item under the pointer:
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proc itemEnter {c} {
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global restoreCmd
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if {[winfo depth $c] == 1} {
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set restoreCmd {}
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return
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}
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set type [$c type current]
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if {$type == "window" || $type == "image"} {
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set restoreCmd {}
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return
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} elseif {$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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return
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} elseif {$type == "image"} {
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set restoreCmd [list $c itemconfig current -state normal]
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$c itemconfig current -state active
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return
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}
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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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&& ($fill == "")} {
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set outline [lindex [$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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} else {
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set restoreCmd "$c itemconfig current -fill $fill"
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$c itemconfig current -fill SteelBlue2
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}
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}
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proc itemLeave {c} {
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global restoreCmd
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eval $restoreCmd
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}
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# Utility procedures for stroking out a rectangle and printing what's
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# underneath the rectangle's area.
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proc itemMark {c x y} {
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global areaX1 areaY1
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set areaX1 [$c canvasx $x]
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set areaY1 [$c canvasy $y]
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$c delete area
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}
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proc itemStroke {c x y} {
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global areaX1 areaY1 areaX2 areaY2
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set x [$c canvasx $x]
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set y [$c canvasy $y]
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if {($areaX1 != $x) && ($areaY1 != $y)} {
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$c delete area
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$c addtag area withtag [$c create rect $areaX1 $areaY1 $x $y \
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-outline black]
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set areaX2 $x
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set areaY2 $y
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}
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}
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proc itemsUnderArea {c} {
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global areaX1 areaY1 areaX2 areaY2
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set area [$c find withtag area]
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set items ""
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foreach i [$c find enclosed $areaX1 $areaY1 $areaX2 $areaY2] {
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if {[lsearch [$c gettags $i] item] != -1} {
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lappend items $i
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}
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}
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puts stdout "Items enclosed by area: $items"
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set items ""
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foreach i [$c find overlapping $areaX1 $areaY1 $areaX2 $areaY2] {
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if {[lsearch [$c gettags $i] item] != -1} {
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lappend items $i
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}
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}
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puts stdout "Items overlapping area: $items"
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}
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set areaX1 0
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set areaY1 0
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set areaX2 0
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set areaY2 0
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# Utility procedures to support dragging of items.
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proc itemStartDrag {c x y} {
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global lastX lastY
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set lastX [$c canvasx $x]
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set lastY [$c canvasy $y]
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}
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proc itemDrag {c x y} {
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global lastX lastY
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set x [$c canvasx $x]
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set y [$c canvasy $y]
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$c move current [expr {$x-$lastX}] [expr {$y-$lastY}]
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set lastX $x
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set lastY $y
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}
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# Procedure that's invoked when the button embedded in the canvas
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# is invoked.
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proc butPress {w color} {
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set i [$w create text 25c 18.1c -text "Oooohhh!!" -fill $color -anchor n]
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after 500 "$w delete $i"
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}
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