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