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6a5fa4e0 MG |
1 | # mkItems w |
2 | # | |
3 | # Create a top-level window containing a canvas that displays the | |
4 | # various item types and allows them to be selected and moved. This | |
5 | # demo can be used to test out the point-hit and rectangle-hit code | |
6 | # for items. | |
7 | # | |
8 | # Arguments: | |
9 | # w - Name to use for new top-level window. | |
10 | ||
11 | proc mkItems {{w .citems}} { | |
12 | global c tk_library | |
13 | catch {destroy $w} | |
14 | toplevel $w | |
15 | dpos $w | |
16 | wm title $w "Canvas Item Demonstration" | |
17 | wm iconname $w "Items" | |
18 | wm minsize $w 100 100 | |
19 | set c $w.frame2.c | |
20 | ||
21 | frame $w.frame1 -relief raised -bd 2 | |
22 | frame $w.frame2 -relief raised -bd 2 | |
23 | button $w.ok -text "OK" -command "destroy $w" | |
24 | pack append $w $w.frame1 {top fill} $w.frame2 {top fill expand} \ | |
25 | $w.ok {bottom pady 10 frame center} | |
26 | message $w.frame1.m -font -Adobe-Times-Medium-R-Normal-*-180-* -aspect 300 \ | |
27 | -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." | |
28 | pack append $w.frame1 $w.frame1.m {frame center} | |
29 | ||
30 | canvas $c -scrollregion {0c 0c 30c 24c} -width 15c -height 10c | |
31 | scrollbar $w.frame2.vscroll -relief sunken -command "$c yview" | |
32 | scrollbar $w.frame2.hscroll -orient horiz -relief sunken -command "$c xview" | |
33 | pack append $w.frame2 $w.frame2.hscroll {bottom fillx} \ | |
34 | $w.frame2.vscroll {right filly} $c {expand fill} | |
35 | $c config -xscroll "$w.frame2.hscroll set" -yscroll "$w.frame2.vscroll set" | |
36 | ||
37 | # Display a 3x3 rectangular grid. | |
38 | ||
39 | $c create rect 0c 0c 30c 24c -width 2 | |
40 | $c create line 0c 8c 30c 8c -width 2 | |
41 | $c create line 0c 16c 30c 16c -width 2 | |
42 | $c create line 10c 0c 10c 24c -width 2 | |
43 | $c create line 20c 0c 20c 24c -width 2 | |
44 | ||
45 | set font1 -Adobe-Helvetica-Medium-R-Normal-*-120-* | |
46 | set font2 -Adobe-Helvetica-Bold-R-Normal-*-240-* | |
47 | if {[winfo screendepth $c] > 4} { | |
48 | set blue DeepSkyBlue3 | |
49 | set red red | |
50 | set bisque bisque3 | |
51 | set green SeaGreen3 | |
52 | } else { | |
53 | set blue black | |
54 | set red black | |
55 | set bisque black | |
56 | set green black | |
57 | } | |
58 | ||
59 | # Set up demos within each of the areas of the grid. | |
60 | ||
61 | $c create text 5c .2c -text Lines -anchor n | |
62 | $c create line 1c 1c 3c 1c 1c 4c 3c 4c -width 2m -fill $blue \ | |
63 | -cap butt -join miter -tags item | |
64 | $c create line 4.67c 1c 4.67c 4c -arrow last -tags item | |
65 | $c create line 6.33c 1c 6.33c 4c -arrow both -tags item | |
66 | $c create line 5c 6c 9c 6c 9c 1c 8c 1c 8c 4.8c 8.8c 4.8c 8.8c 1.2c \ | |
67 | 8.2c 1.2c 8.2c 4.6c 8.6c 4.6c 8.6c 1.4c 8.4c 1.4c 8.4c 4.4c \ | |
68 | -width 3 -fill $red -tags item | |
69 | $c create line 1c 5c 7c 5c 7c 7c 9c 7c -width .5c \ | |
70 | -stipple @$tk_library/demos/bitmaps/grey.25 \ | |
71 | -arrow both -arrowshape {15 15 7} -tags item | |
72 | $c create line 1c 7c 1.75c 5.8c 2.5c 7c 3.25c 5.8c 4c 7c -width .5c \ | |
73 | -cap round -join round -tags item | |
74 | ||
75 | $c create text 15c .2c -text "Curves (smoothed lines)" -anchor n | |
76 | $c create line 11c 4c 11.5c 1c 13.5c 1c 14c 4c -smooth on \ | |
77 | -fill $blue -tags item | |
78 | $c create line 15.5c 1c 19.5c 1.5c 15.5c 4.5c 19.5c 4c -smooth on \ | |
79 | -arrow both -width 3 -tags item | |
80 | $c create line 12c 6c 13.5c 4.5c 16.5c 7.5c 18c 6c \ | |
81 | 16.5c 4.5c 13.5c 7.5c 12c 6c -smooth on -width 3m -cap round \ | |
82 | -stipple @$tk_library/demos/bitmaps/grey.25 -fill $red -tags item | |
83 | ||
84 | $c create text 25c .2c -text Polygons -anchor n | |
85 | $c create polygon 21c 1.0c 22.5c 1.75c 24c 1.0c 23.25c 2.5c \ | |
86 | 24c 4.0c 22.5c 3.25c 21c 4.0c 21.75c 2.5c -fill $green -tags item | |
87 | $c create polygon 25c 4c 25c 4c 25c 1c 26c 1c 27c 4c 28c 1c \ | |
88 | 29c 1c 29c 4c 29c 4c -fill $red -smooth on -tags item | |
89 | $c create polygon 22c 4.5c 25c 4.5c 25c 6.75c 28c 6.75c \ | |
90 | 28c 5.25c 24c 5.25c 24c 6.0c 26c 6c 26c 7.5c 22c 7.5c \ | |
91 | -stipple @$tk_library/demos/bitmaps/grey.25 -tags item | |
92 | ||
93 | $c create text 5c 8.2c -text Rectangles -anchor n | |
94 | $c create rectangle 1c 9.5c 4c 12.5c -outline $red -width 3m -tags item | |
95 | $c create rectangle 0.5c 13.5c 4.5c 15.5c -fill $green -tags item | |
96 | $c create rectangle 6c 10c 9c 15c -outline {} \ | |
97 | -stipple @$tk_library/demos/bitmaps/grey.25 -fill $blue -tags item | |
98 | ||
99 | $c create text 15c 8.2c -text Ovals -anchor n | |
100 | $c create oval 11c 9.5c 14c 12.5c -outline $red -width 3m -tags item | |
101 | $c create oval 10.5c 13.5c 14.5c 15.5c -fill $green -tags item | |
102 | $c create oval 16c 10c 19c 15c -outline {} \ | |
103 | -stipple @$tk_library/demos/bitmaps/grey.25 -fill $blue -tags item | |
104 | ||
105 | $c create text 25c 8.2c -text Text -anchor n | |
106 | $c create rectangle 22.4c 8.9c 22.6c 9.1c | |
107 | $c create text 22.5c 9c -anchor n -font $font1 -width 4c \ | |
108 | -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 | |
109 | $c create rectangle 25.4c 10.9c 25.6c 11.1c | |
110 | $c create text 25.5c 11c -anchor w -font $font1 -fill $blue \ | |
111 | -text "Several lines,\n each centered\nindividually,\nand all anchored\nat the left edge." \ | |
112 | -justify center -tags item | |
113 | $c create rectangle 24.9c 13.9c 25.1c 14.1c | |
114 | $c create text 25c 14c -font $font2 -anchor c -fill $red \ | |
115 | -stipple @$tk_library/demos/bitmaps/grey.5 \ | |
116 | -text "Stippled characters" -tags item | |
117 | ||
118 | $c create text 5c 16.2c -text Arcs -anchor n | |
119 | $c create arc 0.5c 17c 7c 20c -fill $green -outline black \ | |
120 | -start 45 -extent 270 -style pieslice -tags item | |
121 | $c create arc 6.5c 17c 9.5c 20c -width 4m -style arc \ | |
122 | -fill $blue -start -135 -extent 270 \ | |
123 | -stipple @$tk_library/demos/bitmaps/grey.25 -tags item | |
124 | $c create arc 0.5c 20c 9.5c 24c -width 4m -style pieslice \ | |
125 | -fill {} -outline $red -start 225 -extent -90 -tags item | |
126 | $c create arc 5.5c 20.5c 9.5c 23.5c -width 4m -style chord \ | |
127 | -fill $blue -outline {} -start 45 -extent 270 -tags item | |
128 | ||
129 | $c create text 15c 16.2c -text Bitmaps -anchor n | |
130 | $c create bitmap 13c 20c -bitmap @$tk_library/demos/bitmaps/face -tags item | |
131 | $c create bitmap 17c 18.5c \ | |
132 | -bitmap @$tk_library/demos/bitmaps/noletters -tags item | |
133 | $c create bitmap 17c 21.5c \ | |
134 | -bitmap @$tk_library/demos/bitmaps/letters -tags item | |
135 | ||
136 | $c create text 25c 16.2c -text Windows -anchor n | |
137 | button $c.button -text "Press Me" -command "butPress $c $red" | |
138 | $c create window 21c 18c -window $c.button -anchor nw -tags item | |
139 | entry $c.entry -width 20 -relief sunken | |
140 | $c.entry insert end "Edit this text" | |
141 | $c create window 21c 21c -window $c.entry -anchor nw -tags item | |
142 | scale $c.scale -from 0 -to 100 -length 6c -sliderlength .4c \ | |
143 | -width .5c -tickinterval 0 | |
144 | $c create window 28.5c 17.5c -window $c.scale -anchor n -tags item | |
145 | $c create text 21c 17.9c -text Button: -anchor sw | |
146 | $c create text 21c 20.9c -text Entry: -anchor sw | |
147 | $c create text 28.5c 17.4c -text Scale: -anchor s | |
148 | ||
149 | # Set up event bindings for canvas: | |
150 | ||
151 | $c bind item <Any-Enter> "itemEnter $c" | |
152 | $c bind item <Any-Leave> "itemLeave $c" | |
153 | bind $c <2> "$c scan mark %x %y" | |
154 | bind $c <B2-Motion> "$c scan dragto %x %y" | |
155 | bind $c <3> "itemMark $c %x %y" | |
156 | bind $c <B3-Motion> "itemStroke $c %x %y" | |
157 | bind $c <Control-f> "itemsUnderArea $c" | |
158 | bind $c <1> "itemStartDrag $c %x %y" | |
159 | bind $c <B1-Motion> "itemDrag $c %x %y" | |
160 | bind $w <Any-Enter> "focus $c" | |
161 | } | |
162 | ||
163 | # Utility procedures for highlighting the item under the pointer: | |
164 | ||
165 | proc itemEnter {c} { | |
166 | global restoreCmd | |
167 | ||
168 | if {[winfo screendepth $c] <= 4} { | |
169 | set restoreCmd {} | |
170 | return | |
171 | } | |
172 | set type [$c type current] | |
173 | if {$type == "window"} { | |
174 | set restoreCmd {} | |
175 | return | |
176 | } | |
177 | if {$type == "bitmap"} { | |
178 | set bg [lindex [$c itemconf current -background] 4] | |
179 | set restoreCmd [list $c itemconfig current -background $bg] | |
180 | $c itemconfig current -background SteelBlue2 | |
181 | return | |
182 | } | |
183 | set fill [lindex [$c itemconfig current -fill] 4] | |
184 | if {(($type == "rectangle") || ($type == "oval") || ($type == "arc")) | |
185 | && ($fill == "")} { | |
186 | set outline [lindex [$c itemconfig current -outline] 4] | |
187 | set restoreCmd "$c itemconfig current -outline $outline" | |
188 | $c itemconfig current -outline SteelBlue2 | |
189 | } else { | |
190 | set restoreCmd "$c itemconfig current -fill $fill" | |
191 | $c itemconfig current -fill SteelBlue2 | |
192 | } | |
193 | } | |
194 | ||
195 | proc itemLeave {c} { | |
196 | global restoreCmd | |
197 | ||
198 | eval $restoreCmd | |
199 | } | |
200 | ||
201 | # Utility procedures for stroking out a rectangle and printing what's | |
202 | # underneath the rectangle's area. | |
203 | ||
204 | proc itemMark {c x y} { | |
205 | global areaX1 areaY1 | |
206 | set areaX1 [$c canvasx $x] | |
207 | set areaY1 [$c canvasy $y] | |
208 | $c delete area | |
209 | } | |
210 | ||
211 | proc itemStroke {c x y} { | |
212 | global areaX1 areaY1 areaX2 areaY2 | |
213 | set x [$c canvasx $x] | |
214 | set y [$c canvasy $y] | |
215 | if {($areaX1 != $x) && ($areaY1 != $y)} { | |
216 | $c delete area | |
217 | $c addtag area withtag [$c create rect $areaX1 $areaY1 $x $y \ | |
218 | -outline black] | |
219 | set areaX2 $x | |
220 | set areaY2 $y | |
221 | } | |
222 | } | |
223 | ||
224 | proc itemsUnderArea {c} { | |
225 | global areaX1 areaY1 areaX2 areaY2 | |
226 | set area [$c find withtag area] | |
227 | set items "" | |
228 | foreach i [$c find enclosed $areaX1 $areaY1 $areaX2 $areaY2] { | |
229 | if {[lsearch [$c gettags $i] item] != -1} { | |
230 | lappend items $i | |
231 | } | |
232 | } | |
233 | puts stdout "Items enclosed by area: $items" | |
234 | set items "" | |
235 | foreach i [$c find overlapping $areaX1 $areaY1 $areaX2 $areaY2] { | |
236 | if {[lsearch [$c gettags $i] item] != -1} { | |
237 | lappend items $i | |
238 | } | |
239 | } | |
240 | puts stdout "Items overlapping area: $items" | |
241 | } | |
242 | ||
243 | set areaX1 0 | |
244 | set areaY1 0 | |
245 | set areaX2 0 | |
246 | set areaY2 0 | |
247 | ||
248 | # Utility procedures to support dragging of items. | |
249 | ||
250 | proc itemStartDrag {c x y} { | |
251 | global lastX lastY | |
252 | set lastX [$c canvasx $x] | |
253 | set lastY [$c canvasy $y] | |
254 | } | |
255 | ||
256 | proc itemDrag {c x y} { | |
257 | global lastX lastY | |
258 | set x [$c canvasx $x] | |
259 | set y [$c canvasy $y] | |
260 | $c move current [expr $x-$lastX] [expr $y-$lastY] | |
261 | set lastX $x | |
262 | set lastY $y | |
263 | } | |
264 | ||
265 | # Procedure that's invoked when the button embedded in the canvas | |
266 | # is invoked. | |
267 | ||
268 | proc butPress {w color} { | |
269 | set i [$w create text 25c 18.1c -text "Ouch!!" -fill $color -anchor n] | |
270 | after 500 "$w delete $i" | |
271 | } |