Commit | Line | Data |
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920dae64 AT |
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 | ||
8 | if {![info exists widgetDemo]} { | |
9 | error "This script should be run from the \"widget\" demo." | |
10 | } | |
11 | ||
12 | set w .items | |
13 | catch {destroy $w} | |
14 | toplevel $w | |
15 | wm title $w "Canvas Item Demonstration" | |
16 | wm iconname $w "Items" | |
17 | positionWindow $w | |
18 | set c $w.frame.c | |
19 | ||
20 | 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." | |
21 | pack $w.msg -side top | |
22 | ||
23 | frame $w.buttons | |
24 | pack $w.buttons -side bottom -fill x -pady 2m | |
25 | button $w.buttons.dismiss -text Dismiss -command "destroy $w" | |
26 | button $w.buttons.code -text "See Code" -command "showCode $w" | |
27 | pack $w.buttons.dismiss $w.buttons.code -side left -expand 1 | |
28 | ||
29 | frame $w.frame | |
30 | pack $w.frame -side top -fill both -expand yes | |
31 | ||
32 | canvas $c -scrollregion {0c 0c 30c 24c} -width 15c -height 10c \ | |
33 | -relief sunken -borderwidth 2 \ | |
34 | -xscrollcommand "$w.frame.hscroll set" \ | |
35 | -yscrollcommand "$w.frame.vscroll set" | |
36 | scrollbar $w.frame.vscroll -command "$c yview" | |
37 | scrollbar $w.frame.hscroll -orient horiz -command "$c xview" | |
38 | ||
39 | grid $c -in $w.frame \ | |
40 | -row 0 -column 0 -rowspan 1 -columnspan 1 -sticky news | |
41 | grid $w.frame.vscroll \ | |
42 | -row 0 -column 1 -rowspan 1 -columnspan 1 -sticky news | |
43 | grid $w.frame.hscroll \ | |
44 | -row 1 -column 0 -rowspan 1 -columnspan 1 -sticky news | |
45 | grid rowconfig $w.frame 0 -weight 1 -minsize 0 | |
46 | grid 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 | ||
56 | set font1 {Helvetica 12} | |
57 | set font2 {Helvetica 24 bold} | |
58 | if {[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 | |
153 | button $c.button -text "Press Me" -command "butPress $c $red" | |
154 | $c create window 21c 18c -window $c.button -anchor nw -tags item | |
155 | entry $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 | |
158 | scale $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" | |
169 | bind $c <2> "$c scan mark %x %y" | |
170 | bind $c <B2-Motion> "$c scan dragto %x %y" | |
171 | bind $c <3> "itemMark $c %x %y" | |
172 | bind $c <B3-Motion> "itemStroke $c %x %y" | |
173 | bind $c <Control-f> "itemsUnderArea $c" | |
174 | bind $c <1> "itemStartDrag $c %x %y" | |
175 | bind $c <B1-Motion> "itemDrag $c %x %y" | |
176 | ||
177 | # Utility procedures for highlighting the item under the pointer: | |
178 | ||
179 | proc 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 | ||
209 | proc itemLeave {c} { | |
210 | global restoreCmd | |
211 | ||
212 | eval $restoreCmd | |
213 | } | |
214 | ||
215 | # Utility procedures for stroking out a rectangle and printing what's | |
216 | # underneath the rectangle's area. | |
217 | ||
218 | proc itemMark {c x y} { | |
219 | global areaX1 areaY1 | |
220 | set areaX1 [$c canvasx $x] | |
221 | set areaY1 [$c canvasy $y] | |
222 | $c delete area | |
223 | } | |
224 | ||
225 | proc itemStroke {c x y} { | |
226 | global areaX1 areaY1 areaX2 areaY2 | |
227 | set x [$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 $y | |
235 | } | |
236 | } | |
237 | ||
238 | proc itemsUnderArea {c} { | |
239 | global areaX1 areaY1 areaX2 areaY2 | |
240 | set area [$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: $items" | |
255 | } | |
256 | ||
257 | set areaX1 0 | |
258 | set areaY1 0 | |
259 | set areaX2 0 | |
260 | set areaY2 0 | |
261 | ||
262 | # Utility procedures to support dragging of items. | |
263 | ||
264 | proc itemStartDrag {c x y} { | |
265 | global lastX lastY | |
266 | set lastX [$c canvasx $x] | |
267 | set lastY [$c canvasy $y] | |
268 | } | |
269 | ||
270 | proc itemDrag {c x y} { | |
271 | global lastX lastY | |
272 | set x [$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 $y | |
277 | } | |
278 | ||
279 | # Procedure that's invoked when the button embedded in the canvas | |
280 | # is invoked. | |
281 | ||
282 | proc butPress {w color} { | |
283 | set i [$w create text 25c 18.1c -text "Ouch!!" -fill $color -anchor n] | |
284 | after 500 "$w delete $i" | |
285 | } |