1# puzzle.tcl --
2#
3# This demonstration script creates a 15-puzzle game using a collection
4# of buttons.
5#
6# RCS: @(#) $Id$
7
8if {![info exists widgetDemo]} {
9    error "This script should be run from the \"widget\" demo."
10}
11
12package require Tk
13
14# puzzleSwitch --
15# This procedure is invoked when the user clicks on a particular button;
16# if the button is next to the empty space, it moves the button into th
17# empty space.
18
19proc puzzleSwitch {w num} {
20    global xpos ypos
21    if {(($ypos($num) >= ($ypos(space) - .01))
22	    && ($ypos($num) <= ($ypos(space) + .01))
23	    && ($xpos($num) >= ($xpos(space) - .26))
24	    && ($xpos($num) <= ($xpos(space) + .26)))
25	    || (($xpos($num) >= ($xpos(space) - .01))
26	    && ($xpos($num) <= ($xpos(space) + .01))
27	    && ($ypos($num) >= ($ypos(space) - .26))
28	    && ($ypos($num) <= ($ypos(space) + .26)))} {
29	set tmp $xpos(space)
30	set xpos(space) $xpos($num)
31	set xpos($num) $tmp
32	set tmp $ypos(space)
33	set ypos(space) $ypos($num)
34	set ypos($num) $tmp
35	place $w.frame.$num -relx $xpos($num) -rely $ypos($num)
36    }
37}
38
39set w .puzzle
40catch {destroy $w}
41toplevel $w
42wm title $w "15-Puzzle Demonstration"
43wm iconname $w "15-Puzzle"
44positionWindow $w
45
46label $w.msg -font $font -wraplength 4i -justify left -text "A 15-puzzle appears below as a collection of buttons.  Click on any of the pieces next to the space, and that piece will slide over the space.  Continue this until the pieces are arranged in numerical order from upper-left to lower-right."
47pack $w.msg -side top
48
49## See Code / Dismiss buttons
50set btns [addSeeDismiss $w.buttons $w]
51pack $btns -side bottom -fill x
52
53# Special trick: select a darker color for the space by creating a
54# scrollbar widget and using its trough color.
55
56scrollbar $w.s
57
58# The button metrics are a bit bigger in Aqua, and since we are
59# using place which doesn't autosize, then we need to have a
60# slightly larger frame here...
61
62if {[tk windowingsystem] eq "aqua"} {
63    set frameSize 168
64} else {
65    set frameSize 120
66}
67
68frame $w.frame -width $frameSize -height $frameSize -borderwidth 2\
69	-relief sunken -bg [$w.s cget -troughcolor]
70pack $w.frame -side top -pady 1c -padx 1c
71destroy $w.s
72
73set order {3 1 6 2 5 7 15 13 4 11 8 9 14 10 12}
74for {set i 0} {$i < 15} {set i [expr {$i+1}]} {
75    set num [lindex $order $i]
76    set xpos($num) [expr {($i%4)*.25}]
77    set ypos($num) [expr {($i/4)*.25}]
78    button $w.frame.$num -relief raised -text $num -highlightthickness 0 \
79	    -command "puzzleSwitch $w $num"
80    place $w.frame.$num -relx $xpos($num) -rely $ypos($num) \
81	-relwidth .25 -relheight .25
82}
83set xpos(space) .75
84set ypos(space) .75
85