| 1 | #!/bin/sh |
| 2 | # the next line restarts using wish \ |
| 3 | exec wish8.4 "$0" "$@" |
| 4 | |
| 5 | # square -- |
| 6 | # This script generates a demo application containing only a "square" |
| 7 | # widget. It's only usable in the "tktest" application or if Tk has |
| 8 | # been compiled with tkSquare.c. This demo arranges the following |
| 9 | # bindings for the widget: |
| 10 | # |
| 11 | # Button-1 press/drag: moves square to mouse |
| 12 | # "a": toggle size animation on/off |
| 13 | # |
| 14 | # RCS: @(#) $Id: square,v 1.2 1998/09/14 18:23:30 stanton Exp $ |
| 15 | |
| 16 | square .s |
| 17 | pack .s -expand yes -fill both |
| 18 | wm minsize . 1 1 |
| 19 | |
| 20 | bind .s <1> {center %x %y} |
| 21 | bind .s <B1-Motion> {center %x %y} |
| 22 | bind .s a animate |
| 23 | focus .s |
| 24 | |
| 25 | # The procedure below centers the square on a given position. |
| 26 | |
| 27 | proc center {x y} { |
| 28 | set a [.s size] |
| 29 | .s position [expr $x-($a/2)] [expr $y-($a/2)] |
| 30 | } |
| 31 | |
| 32 | # The procedures below provide a simple form of animation where |
| 33 | # the box changes size in a pulsing pattern: larger, smaller, larger, |
| 34 | # and so on. |
| 35 | |
| 36 | set inc 0 |
| 37 | proc animate {} { |
| 38 | global inc |
| 39 | if {$inc == 0} { |
| 40 | set inc 3 |
| 41 | timer |
| 42 | } else { |
| 43 | set inc 0 |
| 44 | } |
| 45 | } |
| 46 | |
| 47 | proc timer {} { |
| 48 | global inc |
| 49 | set s [.s size] |
| 50 | if {$inc == 0} return |
| 51 | if {$s >= 40} {set inc -3} |
| 52 | if {$s <= 10} {set inc 3} |
| 53 | .s size [expr {$s+$inc}] |
| 54 | after 30 timer |
| 55 | } |