3 # This demonstration script creates a canvas widget that displays a
4 # large line with an arrowhead whose shape can be edited interactively.
6 if {![info exists widgetDemo]} {
7 error "This script should be run from the \"widget\" demo."
13 # This procedure regenerates all the text and graphics in the canvas
14 # window. It's called when the canvas is initially created, and also
15 # whenever any of the parameters of the arrow head are changed
19 # c - Name of the canvas widget.
22 upvar #0 demo_arrowInfo v
24 # Remember the current box, if there is one.
26 set tags [$c gettags current]
28 set cur [lindex $tags [lsearch -glob $tags box?]]
33 # Create the arrow and outline.
36 eval {$c create line $v(x1) $v(y) $v(x2) $v(y) -arrow last \
37 -width [expr {10*$v(width)}] -arrowshape [list \
38 [expr {10*$v(a)}] [expr {10*$v(b)}] [expr {10*$v(c)}]]} \
40 set xtip [expr {$v(x2)-10*$v(b)}]
41 set deltaY [expr {10*$v(c)+5*$v(width)}]
42 $c create line $v(x2) $v(y) $xtip [expr {$v(y)+$deltaY}] \
43 [expr {$v(x2)-10*$v(a)}] $v(y) $xtip [expr {$v(y)-$deltaY}] \
44 $v(x2) $v(y) -width 2 -capstyle round -joinstyle round
46 # Create the boxes for reshaping the line and arrowhead.
48 eval {$c create rect [expr {$v(x2)-10*$v(a)-5}] [expr {$v(y)-5}] \
49 [expr {$v(x2)-10*$v(a)+5}] [expr {$v(y)+5}] \
50 -tags {box1 box}} $v(boxStyle)
51 eval {$c create rect [expr {$xtip-5}] [expr {$v(y)-$deltaY-5}] \
52 [expr {$xtip+5}] [expr {$v(y)-$deltaY+5}] \
53 -tags {box2 box}} $v(boxStyle)
54 eval {$c create rect [expr {$v(x1)-5}] [expr {$v(y)-5*$v(width)-5}] \
55 [expr {$v(x1)+5}] [expr {$v(y)-5*$v(width)+5}] \
56 -tags {box3 box}} $v(boxStyle)
58 eval $c itemconfigure $cur $v(activeStyle)
61 # Create three arrows in actual size with the same parameters
63 $c create line [expr {$v(x2)+50}] 0 [expr {$v(x2)+50}] 1000 \
65 set tmp [expr {$v(x2)+100}]
66 $c create line $tmp [expr {$v(y)-125}] $tmp [expr {$v(y)-75}] \
68 -arrow both -arrowshape "$v(a) $v(b) $v(c)"
69 $c create line [expr {$tmp-25}] $v(y) [expr {$tmp+25}] $v(y) \
71 -arrow both -arrowshape "$v(a) $v(b) $v(c)"
72 $c create line [expr {$tmp-25}] [expr {$v(y)+75}] [expr {$tmp+25}] \
73 [expr {$v(y)+125}] -width $v(width) \
74 -arrow both -arrowshape "$v(a) $v(b) $v(c)"
76 # Create a bunch of other arrows and text items showing the
79 set tmp [expr {$v(x2)+10}]
80 $c create line $tmp [expr {$v(y)-5*$v(width)}] \
81 $tmp [expr {$v(y)-$deltaY}] \
82 -arrow both -arrowshape $v(smallTips)
83 $c create text [expr {$v(x2)+15}] [expr {$v(y)-$deltaY+5*$v(c)}] \
85 set tmp [expr {$v(x1)-10}]
86 $c create line $tmp [expr {$v(y)-5*$v(width)}] \
87 $tmp [expr {$v(y)+5*$v(width)}] \
88 -arrow both -arrowshape $v(smallTips)
89 $c create text [expr {$v(x1)-15}] $v(y) -text $v(width) -anchor e
90 set tmp [expr {$v(y)+5*$v(width)+10*$v(c)+10}]
91 $c create line [expr {$v(x2)-10*$v(a)}] $tmp $v(x2) $tmp \
92 -arrow both -arrowshape $v(smallTips)
93 $c create text [expr {$v(x2)-5*$v(a)}] [expr {$tmp+5}] \
95 set tmp [expr {$tmp+25}]
96 $c create line [expr {$v(x2)-10*$v(b)}] $tmp $v(x2) $tmp \
97 -arrow both -arrowshape $v(smallTips)
98 $c create text [expr {$v(x2)-5*$v(b)}] [expr {$tmp+5}] \
101 $c create text $v(x1) 310 -text "-width $v(width)" \
102 -anchor w -font {Helvetica 18}
103 $c create text $v(x1) 330 -text "-arrowshape {$v(a) $v(b) $v(c)}" \
104 -anchor w -font {Helvetica 18}
112 wm title $w "Arrowhead Editor Demonstration"
113 wm iconname $w "arrow"
117 label $w.msg -font $font -wraplength 5i -justify left -text "This widget allows you to experiment with different widths and arrowhead shapes for lines in canvases. To change the line width or the shape of the arrowhead, drag any of the three boxes attached to the oversized arrow. The arrows on the right give examples at normal scale. The text at the bottom shows the configuration options as you'd enter them for a canvas line item."
118 pack $w.msg -side top
120 ## See Code / Dismiss buttons
121 set btns [addSeeDismiss $w.buttons $w]
122 pack $btns -side bottom -fill x
124 canvas $c -width 500 -height 350 -relief sunken -borderwidth 2
125 pack $c -expand yes -fill both
127 set demo_arrowInfo(a) 8
128 set demo_arrowInfo(b) 10
129 set demo_arrowInfo(c) 3
130 set demo_arrowInfo(width) 2
131 set demo_arrowInfo(motionProc) arrowMoveNull
132 set demo_arrowInfo(x1) 40
133 set demo_arrowInfo(x2) 350
134 set demo_arrowInfo(y) 150
135 set demo_arrowInfo(smallTips) {5 5 2}
136 set demo_arrowInfo(count) 0
137 if {[winfo depth $c] > 1} {
138 if {[tk windowingsystem] eq "aqua"} {
139 set demo_arrowInfo(bigLineStyle) "-fill systemSelectedTextBackgroundColor"
141 set demo_arrowInfo(bigLineStyle) "-fill LightSeaGreen"
143 set demo_arrowInfo(boxStyle) "-fill {} -width 1"
144 set demo_arrowInfo(activeStyle) "-fill red -width 1"
146 # Main widget program sets variable tk_demoDirectory
147 set demo_arrowInfo(bigLineStyle) "-fill black \
148 -stipple @[file join $tk_demoDirectory images grey.25]"
149 set demo_arrowInfo(boxStyle) "-fill {} -outline black -width 1"
150 set demo_arrowInfo(activeStyle) "-fill black -outline black -width 1"
153 $c bind box <Enter> "$c itemconfigure current $demo_arrowInfo(activeStyle)"
154 $c bind box <Leave> "$c itemconfigure current $demo_arrowInfo(boxStyle)"
155 $c bind box <B1-Enter> " "
156 $c bind box <B1-Leave> " "
157 $c bind box1 <Button-1> {set demo_arrowInfo(motionProc) arrowMove1}
158 $c bind box2 <Button-1> {set demo_arrowInfo(motionProc) arrowMove2}
159 $c bind box3 <Button-1> {set demo_arrowInfo(motionProc) arrowMove3}
160 $c bind box <B1-Motion> "\$demo_arrowInfo(motionProc) $c %x %y"
161 bind $c <ButtonRelease-1> "arrowSetup $c"
164 # This procedure is called for each mouse motion event on box1 (the
165 # one at the vertex of the arrow). It updates the controlling parameters
166 # for the line and arrowhead.
169 # c - The name of the canvas window.
170 # x, y - The coordinates of the mouse.
172 proc arrowMove1 {c x y} {
173 upvar #0 demo_arrowInfo v
174 set newA [expr {($v(x2)+5-round([$c canvasx $x]))/10}]
181 if {$newA != $v(a)} {
182 $c move box1 [expr {10*($v(a)-$newA)}] 0
188 # This procedure is called for each mouse motion event on box2 (the
189 # one at the trailing tip of the arrowhead). It updates the controlling
190 # parameters for the line and arrowhead.
193 # c - The name of the canvas window.
194 # x, y - The coordinates of the mouse.
196 proc arrowMove2 {c x y} {
197 upvar #0 demo_arrowInfo v
198 set newB [expr {($v(x2)+5-round([$c canvasx $x]))/10}]
205 set newC [expr {($v(y)+5-round([$c canvasy $y])-5*$v(width))/10}]
212 if {($newB != $v(b)) || ($newC != $v(c))} {
213 $c move box2 [expr {10*($v(b)-$newB)}] [expr {10*($v(c)-$newC)}]
220 # This procedure is called for each mouse motion event on box3 (the
221 # one that controls the thickness of the line). It updates the
222 # controlling parameters for the line and arrowhead.
225 # c - The name of the canvas window.
226 # x, y - The coordinates of the mouse.
228 proc arrowMove3 {c x y} {
229 upvar #0 demo_arrowInfo v
230 set newWidth [expr {($v(y)+2-round([$c canvasy $y]))/5}]
234 if {$newWidth > 20} {
237 if {$newWidth != $v(width)} {
238 $c move box3 0 [expr {5*($v(width)-$newWidth)}]
239 set v(width) $newWidth