1# items.tcl -- 2# 3# This demonstration script creates a canvas that displays the 4# canvas item types. 5# 6# RCS: @(#) $Id: items.tcl,v 1.3 2001/06/14 10:56:58 dkf Exp $ 7 8if {![info exists widgetDemo]} { 9 error "This script should be run from the \"widget\" demo." 10} 11 12set w .items 13catch {destroy $w} 14toplevel $w 15wm title $w "Canvas Item Demonstration" 16wm iconname $w "Items" 17positionWindow $w 18set c $w.frame.c 19 20label $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." 21pack $w.msg -side top 22 23frame $w.buttons 24pack $w.buttons -side bottom -fill x -pady 2m 25button $w.buttons.dismiss -text Dismiss -command "destroy $w" 26button $w.buttons.code -text "See Code" -command "showCode $w" 27pack $w.buttons.dismiss $w.buttons.code -side left -expand 1 28 29frame $w.frame 30pack $w.frame -side top -fill both -expand yes 31 32canvas $c -scrollregion {0c 0c 30c 24c} -width 15c -height 10c \ 33 -relief sunken -borderwidth 2 \ 34 -xscrollcommand "$w.frame.hscroll set" \ 35 -yscrollcommand "$w.frame.vscroll set" 36scrollbar $w.frame.vscroll -command "$c yview" 37scrollbar $w.frame.hscroll -orient horiz -command "$c xview" 38 39grid $c -in $w.frame \ 40 -row 0 -column 0 -rowspan 1 -columnspan 1 -sticky news 41grid $w.frame.vscroll \ 42 -row 0 -column 1 -rowspan 1 -columnspan 1 -sticky news 43grid $w.frame.hscroll \ 44 -row 1 -column 0 -rowspan 1 -columnspan 1 -sticky news 45grid rowconfig $w.frame 0 -weight 1 -minsize 0 46grid columnconfig $w.frame 0 -weight 1 -minsize 0 47 48# Display a 3x3 rectangular grid. 49 50$c create rect 0c 0c 30c 24c -width 2 51$c create line 0c 8c 30c 8c -width 2 52$c create line 0c 16c 30c 16c -width 2 53$c create line 10c 0c 10c 24c -width 2 54$c create line 20c 0c 20c 24c -width 2 55 56set font1 {Helvetica 12} 57set font2 {Helvetica 24 bold} 58if {[winfo depth $c] > 1} { 59 set blue DeepSkyBlue3 60 set red red 61 set bisque bisque3 62 set green SeaGreen3 63} else { 64 set blue black 65 set red black 66 set bisque black 67 set green black 68} 69 70# Set up demos within each of the areas of the grid. 71 72$c create text 5c .2c -text Lines -anchor n 73$c create line 1c 1c 3c 1c 1c 4c 3c 4c -width 2m -fill $blue \ 74 -cap butt -join miter -tags item 75$c create line 4.67c 1c 4.67c 4c -arrow last -tags item 76$c create line 6.33c 1c 6.33c 4c -arrow both -tags item 77$c create line 5c 6c 9c 6c 9c 1c 8c 1c 8c 4.8c 8.8c 4.8c 8.8c 1.2c \ 78 8.2c 1.2c 8.2c 4.6c 8.6c 4.6c 8.6c 1.4c 8.4c 1.4c 8.4c 4.4c \ 79 -width 3 -fill $red -tags item 80$c create line 1c 5c 7c 5c 7c 7c 9c 7c -width .5c \ 81 -stipple @[file join $tk_library demos images gray25.bmp] \ 82 -arrow both -arrowshape {15 15 7} -tags item 83$c create line 1c 7c 1.75c 5.8c 2.5c 7c 3.25c 5.8c 4c 7c -width .5c \ 84 -cap round -join round -tags item 85 86$c create text 15c .2c -text "Curves (smoothed lines)" -anchor n 87$c create line 11c 4c 11.5c 1c 13.5c 1c 14c 4c -smooth on \ 88 -fill $blue -tags item 89$c create line 15.5c 1c 19.5c 1.5c 15.5c 4.5c 19.5c 4c -smooth on \ 90 -arrow both -width 3 -tags item 91$c create line 12c 6c 13.5c 4.5c 16.5c 7.5c 18c 6c \ 92 16.5c 4.5c 13.5c 7.5c 12c 6c -smooth on -width 3m -cap round \ 93 -stipple @[file join $tk_library demos images gray25.bmp] \ 94 -fill $red -tags item 95 96$c create text 25c .2c -text Polygons -anchor n 97$c create polygon 21c 1.0c 22.5c 1.75c 24c 1.0c 23.25c 2.5c \ 98 24c 4.0c 22.5c 3.25c 21c 4.0c 21.75c 2.5c -fill $green \ 99 -outline black -width 4 -tags item 100$c create polygon 25c 4c 25c 4c 25c 1c 26c 1c 27c 4c 28c 1c \ 101 29c 1c 29c 4c 29c 4c -fill $red -smooth on -tags item 102$c create polygon 22c 4.5c 25c 4.5c 25c 6.75c 28c 6.75c \ 103 28c 5.25c 24c 5.25c 24c 6.0c 26c 6c 26c 7.5c 22c 7.5c \ 104 -stipple @[file join $tk_library demos images gray25.bmp] \ 105 -outline black -tags item 106 107$c create text 5c 8.2c -text Rectangles -anchor n 108$c create rectangle 1c 9.5c 4c 12.5c -outline $red -width 3m -tags item 109$c create rectangle 0.5c 13.5c 4.5c 15.5c -fill $green -tags item 110$c create rectangle 6c 10c 9c 15c -outline {} \ 111 -stipple @[file join $tk_library demos images gray25.bmp] \ 112 -fill $blue -tags item 113 114$c create text 15c 8.2c -text Ovals -anchor n 115$c create oval 11c 9.5c 14c 12.5c -outline $red -width 3m -tags item 116$c create oval 10.5c 13.5c 14.5c 15.5c -fill $green -tags item 117$c create oval 16c 10c 19c 15c -outline {} \ 118 -stipple @[file join $tk_library demos images gray25.bmp] \ 119 -fill $blue -tags item 120 121$c create text 25c 8.2c -text Text -anchor n 122$c create rectangle 22.4c 8.9c 22.6c 9.1c 123$c create text 22.5c 9c -anchor n -font $font1 -width 4c \ 124 -text "A short string of text, word-wrapped, justified left, and anchored north (at the top). The rectangles show the anchor points for each piece of text." -tags item 125$c create rectangle 25.4c 10.9c 25.6c 11.1c 126$c create text 25.5c 11c -anchor w -font $font1 -fill $blue \ 127 -text "Several lines,\n each centered\nindividually,\nand all anchored\nat the left edge." \ 128 -justify center -tags item 129$c create rectangle 24.9c 13.9c 25.1c 14.1c 130$c create text 25c 14c -font $font2 -anchor c -fill $red -stipple gray50 \ 131 -text "Stippled characters" -tags item 132 133$c create text 5c 16.2c -text Arcs -anchor n 134$c create arc 0.5c 17c 7c 20c -fill $green -outline black \ 135 -start 45 -extent 270 -style pieslice -tags item 136$c create arc 6.5c 17c 9.5c 20c -width 4m -style arc \ 137 -outline $blue -start -135 -extent 270 -tags item \ 138 -outlinestipple @[file join $tk_library demos images gray25.bmp] 139$c create arc 0.5c 20c 9.5c 24c -width 4m -style pieslice \ 140 -fill {} -outline $red -start 225 -extent -90 -tags item 141$c create arc 5.5c 20.5c 9.5c 23.5c -width 4m -style chord \ 142 -fill $blue -outline {} -start 45 -extent 270 -tags item 143 144$c create text 15c 16.2c -text Bitmaps -anchor n 145$c create bitmap 13c 20c -tags item \ 146 -bitmap @[file join $tk_library demos images face.bmp] 147$c create bitmap 17c 18.5c -tags item \ 148 -bitmap @[file join $tk_library demos images noletter.bmp] 149$c create bitmap 17c 21.5c -tags item \ 150 -bitmap @[file join $tk_library demos images letters.bmp] 151 152$c create text 25c 16.2c -text Windows -anchor n 153button $c.button -text "Press Me" -command "butPress $c $red" 154$c create window 21c 18c -window $c.button -anchor nw -tags item 155entry $c.entry -width 20 -relief sunken 156$c.entry insert end "Edit this text" 157$c create window 21c 21c -window $c.entry -anchor nw -tags item 158scale $c.scale -from 0 -to 100 -length 6c -sliderlength .4c \ 159 -width .5c -tickinterval 0 160$c create window 28.5c 17.5c -window $c.scale -anchor n -tags item 161$c create text 21c 17.9c -text Button: -anchor sw 162$c create text 21c 20.9c -text Entry: -anchor sw 163$c create text 28.5c 17.4c -text Scale: -anchor s 164 165# Set up event bindings for canvas: 166 167$c bind item <Any-Enter> "itemEnter $c" 168$c bind item <Any-Leave> "itemLeave $c" 169bind $c <2> "$c scan mark %x %y" 170bind $c <B2-Motion> "$c scan dragto %x %y" 171bind $c <3> "itemMark $c %x %y" 172bind $c <B3-Motion> "itemStroke $c %x %y" 173bind $c <Control-f> "itemsUnderArea $c" 174bind $c <1> "itemStartDrag $c %x %y" 175bind $c <B1-Motion> "itemDrag $c %x %y" 176 177# Utility procedures for highlighting the item under the pointer: 178 179proc itemEnter {c} { 180 global restoreCmd 181 182 if {[winfo depth $c] == 1} { 183 set restoreCmd {} 184 return 185 } 186 set type [$c type current] 187 if {$type == "window"} { 188 set restoreCmd {} 189 return 190 } 191 if {$type == "bitmap"} { 192 set bg [lindex [$c itemconf current -background] 4] 193 set restoreCmd [list $c itemconfig current -background $bg] 194 $c itemconfig current -background SteelBlue2 195 return 196 } 197 set fill [lindex [$c itemconfig current -fill] 4] 198 if {(($type == "rectangle") || ($type == "oval") || ($type == "arc")) 199 && ($fill == "")} { 200 set outline [lindex [$c itemconfig current -outline] 4] 201 set restoreCmd "$c itemconfig current -outline $outline" 202 $c itemconfig current -outline SteelBlue2 203 } else { 204 set restoreCmd "$c itemconfig current -fill $fill" 205 $c itemconfig current -fill SteelBlue2 206 } 207} 208 209proc itemLeave {c} { 210 global restoreCmd 211 212 eval $restoreCmd 213} 214 215# Utility procedures for stroking out a rectangle and printing what's 216# underneath the rectangle's area. 217 218proc itemMark {c x y} { 219 global areaX1 areaY1 220 set areaX1 [$c canvasx $x] 221 set areaY1 [$c canvasy $y] 222 $c delete area 223} 224 225proc itemStroke {c x y} { 226 global areaX1 areaY1 areaX2 areaY2 227 set x [$c canvasx $x] 228 set y [$c canvasy $y] 229 if {($areaX1 != $x) && ($areaY1 != $y)} { 230 $c delete area 231 $c addtag area withtag [$c create rect $areaX1 $areaY1 $x $y \ 232 -outline black] 233 set areaX2 $x 234 set areaY2 $y 235 } 236} 237 238proc itemsUnderArea {c} { 239 global areaX1 areaY1 areaX2 areaY2 240 set area [$c find withtag area] 241 set items "" 242 foreach i [$c find enclosed $areaX1 $areaY1 $areaX2 $areaY2] { 243 if {[lsearch [$c gettags $i] item] != -1} { 244 lappend items $i 245 } 246 } 247 puts stdout "Items enclosed by area: $items" 248 set items "" 249 foreach i [$c find overlapping $areaX1 $areaY1 $areaX2 $areaY2] { 250 if {[lsearch [$c gettags $i] item] != -1} { 251 lappend items $i 252 } 253 } 254 puts stdout "Items overlapping area: $items" 255} 256 257set areaX1 0 258set areaY1 0 259set areaX2 0 260set areaY2 0 261 262# Utility procedures to support dragging of items. 263 264proc itemStartDrag {c x y} { 265 global lastX lastY 266 set lastX [$c canvasx $x] 267 set lastY [$c canvasy $y] 268} 269 270proc itemDrag {c x y} { 271 global lastX lastY 272 set x [$c canvasx $x] 273 set y [$c canvasy $y] 274 $c move current [expr {$x-$lastX}] [expr {$y-$lastY}] 275 set lastX $x 276 set lastY $y 277} 278 279# Procedure that's invoked when the button embedded in the canvas 280# is invoked. 281 282proc butPress {w color} { 283 set i [$w create text 25c 18.1c -text "Ouch!!" -fill $color -anchor n] 284 after 500 "$w delete $i" 285} 286