55 lines
1.2 KiB
Tcl
55 lines
1.2 KiB
Tcl
#!/bin/sh
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# the next line restarts using wish \
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exec wish "$0" "$@"
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# square --
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# This script generates a demo application containing only a "square"
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# widget. It's only usable in the "tktest" application or if Tk has
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# been compiled with tkSquare.c. This demo arranges the following
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# bindings for the widget:
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#
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# Button-1 press/drag: moves square to mouse
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# "a": toggle size animation on/off
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#
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# RCS: @(#) $Id: square,v 1.2 1998/09/14 18:23:30 stanton Exp $
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square .s
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pack .s -expand yes -fill both
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wm minsize . 1 1
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bind .s <1> {center %x %y}
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bind .s <B1-Motion> {center %x %y}
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bind .s a animate
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focus .s
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# The procedure below centers the square on a given position.
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proc center {x y} {
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set a [.s size]
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.s position [expr $x-($a/2)] [expr $y-($a/2)]
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}
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# The procedures below provide a simple form of animation where
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# the box changes size in a pulsing pattern: larger, smaller, larger,
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# and so on.
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set inc 0
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proc animate {} {
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global inc
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if {$inc == 0} {
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set inc 3
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timer
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} else {
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set inc 0
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}
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}
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proc timer {} {
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global inc
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set s [.s size]
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if {$inc == 0} return
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if {$s >= 40} {set inc -3}
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if {$s <= 10} {set inc 3}
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.s size [expr {$s+$inc}]
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after 30 timer
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}
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