Flow Colors

Intro

Keith Vetter 2014-04-23 : I recently came across the simple yet addictive puzzle game Flow Colors , and I decided it would be fun to write my own version of the game.

The object of Flow Colors is lay pipes to connect all pairs of colors. A level is solved when all the colors are paired and the entire board is filled.
Flow Colors is based on a game by Mohammed el-Madhoun, see [1 ].

HJG 2015-06-18: That link expired, last archived version: [2 ]

Also: http://www.senscritique.com/jeuvideo/Flow_Colors/10749199/actualites

https://wiki.tcl-lang.org/_repo/wiki_images/flowColors_screenshot.png

Program

##+##########################################################################
#
# flowColors.tcl -- plays game Flow Colors
# http://moh97.us/flow/
# by Keith Vetter April 2014
#

package require Tk
package require Img
package require tooltip

set S(state) play
set S(stage) 1
set S(level) 1
set S(solved) {}
set S(margin) 75
set S(sz) 90
set S(radius,factor) .35
set S(lwidth,factor) .30
set S(stageButton,size) 4
set S(fade,params) {20 20}
set S(hints,canDo) 0
set S(hints,used) 0
set S(shiftStage,params) {100 10}
set S(darken,0) 30
set S(darken,1) 70
if {$tcl_platform(os) eq "Darwin"} {
    set S(rcFile) [file join $::env(HOME) Library Preference flowColors.rc]
} elseif {$tcl_platform(platform) eq "windows"} {
    set S(rcFile) [file join $::env(HOME) flowColors.rc]
} else {
    set S(rcFile) [file join $::env(HOME) .flowColorsrc]
}
array set SOLUTIONS {}

set CLR(bg) black
set CLR(fg) white
set CLR(txt) red
set CLR(dialog,bg) bisque
set CLR(dialog,fg) black
set CLR(dialog,txt) gray20
set CLR(dialog,button)  [::tk::Darken $CLR(dialog,bg) 50]
set CLR(dialog,button) bisque4
set CLR(dialog,highlight) pink
set CLR(star) darkgoldenrod
set CLR(stageButton,off) white
set CLR(stageButton,on) red

catch {font delete myDialogFont}
catch {font delete myDisplayFont}
font create myDialogFont       {*}[font actual {Helvetica 14 bold}]
font create myDisplayFont      {*}[font actual {Helvetica 18 bold}]
font create myDisplayFontBig   {*}[font actual {Helvetica 32 bold}]
font create myDisplayFontTitle {*}[font actual {Helvetica 56 bold}]

array set BOARDS {
    1,1 {6 blue 0 1 5 0 cyan 4 2 1 4 darkorange 0 0 4 0 green 0 2 2 2 red 5 2 0 5 yellow 3 2 0 4}
    1,2 {6 blue 0 2 3 5 cyan 3 3 4 4 darkorange 0 1 4 5 green 0 5 2 5 red 2 3 4 1 yellow 2 2 4 2}
    1,3 {6 blue 1 4 4 4 darkorange 1 3 4 2 green 2 5 3 2 red 0 0 1 5 yellow 2 3 4 1}
    1,4 {6 blue 1 4 4 4 darkorange 4 3 5 2 green 1 1 4 2 yellow 2 3 5 3}
    1,5 {6 blue 0 1 3 2 darkorange 1 1 4 3 green 1 3 5 5 yellow 0 2 1 4}
    1,6 {6 blue 0 0 5 4 darkorange 3 4 4 1 green 2 0 2 4 yellow 2 3 4 4}
    1,7 {6 blue 3 2 5 0 cyan 3 4 4 2 darkorange 1 1 3 5 green 0 5 2 5 red 0 3 2 4 yellow 1 3 3 3}
    1,8 {6 blue 0 2 2 3 darkorange 1 1 3 2 green 1 2 4 4 red 2 5 4 0 yellow 0 3 1 5}
    1,9 {6 blue 0 4 4 4 darkorange 2 2 5 1 green 0 5 3 3 red 1 2 4 1 yellow 3 2 5 2}
    1,10 {6 blue 4 1 4 5 cyan 1 2 1 5 darkorange 2 0 5 5 green 0 1 0 5 red 0 0 2 5 yellow 3 1 3 5}
    1,11 {6 blue 1 1 2 5 darkorange 1 2 1 4 green 3 5 4 0 red 1 5 3 4 yellow 4 1 4 4}
    1,12 {6 blue 0 1 3 3 darkorange 1 1 2 3 green 0 2 5 1 yellow 1 2 5 0}
    1,13 {6 blue 0 2 2 0 darkorange 4 1 5 0 green 1 1 4 4 red 1 2 2 5 yellow 1 4 4 0}
    1,14 {6 blue 1 4 5 5 darkorange 0 4 4 5 green 1 2 5 1 red 3 3 5 3 yellow 5 0 5 2}
    1,15 {6 blue 1 0 2 1 cyan 2 4 5 1 darkorange 4 3 5 2 green 2 3 4 4 red 2 0 5 0 yellow 0 0 5 3}
    1,16 {6 blue 0 3 5 0 cyan 0 2 1 0 darkorange 2 4 4 4 green 2 3 3 1 red 3 3 4 1 yellow 1 4 4 0}
    1,17 {6 blue 1 3 5 4 cyan 2 1 3 2 darkorange 2 4 4 4 green 2 3 4 0 red 0 5 1 1 yellow 0 1 4 2}
    1,18 {6 blue 4 2 4 4 darkorange 0 5 5 0 green 1 1 5 2 red 2 1 2 3 yellow 1 5 5 3}
    1,19 {6 blue 0 5 2 2 darkorange 0 1 3 4 green 0 0 2 4 red 1 5 2 3 yellow 4 1 4 4}
    1,20 {6 blue 3 3 4 1 darkorange 0 0 5 3 green 2 4 3 2 yellow 3 4 4 3}
    1,21 {6 blue 0 0 1 1 cyan 0 4 5 0 darkorange 0 3 2 3 green 0 5 5 1 red 0 1 2 1 yellow 2 0 3 3}
    1,22 {6 blue 0 0 4 3 darkorange 2 0 4 2 green 2 1 3 2 red 0 5 4 0 yellow 1 0 3 3}
    1,23 {6 blue 0 5 5 5 darkorange 1 5 4 5 green 2 2 2 4 yellow 2 5 3 2}
    1,24 {6 blue 3 2 4 1 cyan 0 5 5 5 darkorange 1 0 1 3 green 0 0 1 2 red 0 2 4 3 yellow 3 1 4 4}
    1,25 {6 blue 2 3 2 5 cyan 2 2 3 4 darkorange 0 2 0 5 green 0 1 5 0 red 1 5 5 1 yellow 3 3 4 4}
    1,26 {6 blue 3 3 5 0 darkorange 2 3 3 0 green 1 0 4 3 red 0 0 5 3 yellow 4 2 5 1}
    1,27 {6 blue 2 4 5 4 darkorange 0 0 4 1 green 1 5 5 3 red 1 4 4 4 yellow 1 0 5 2}
    1,28 {6 blue 4 1 4 4 darkorange 1 1 5 0 green 0 0 2 3 yellow 0 1 5 1}
    1,29 {6 blue 1 0 3 5 cyan 4 5 5 3 darkorange 1 3 4 4 green 2 3 3 0 red 1 1 2 0 yellow 1 2 4 1}
    1,30 {6 blue 1 1 4 5 darkorange 3 1 5 0 green 1 3 4 4 red 1 0 3 5 yellow 2 1 4 1}
    2,1 {7 blue 0 6 6 5 cyan 3 4 6 6 darkorange 1 5 2 1 green 3 3 4 2 red 1 6 5 4 yellow 4 4 5 5}
    2,2 {7 blue 1 3 1 5 cyan 3 2 4 5 darkorange 1 2 5 2 green 2 2 3 5 magenta 0 1 6 2 red 0 2 6 3 yellow 3 3 4 4}
    2,3 {7 blue 4 0 6 6 brown 3 0 5 1 cyan 0 0 1 6 darkorange 2 3 4 5 green 2 4 3 6 magenta 2 0 2 2 red 3 2 4 6 yellow 1 0 2 6}
    2,4 {7 blue 4 4 5 1 darkorange 4 2 5 4 green 1 0 6 0 red 5 0 5 5 yellow 2 2 3 4}
    2,5 {7 blue 0 1 3 4 cyan 0 0 6 1 darkorange 3 1 6 6 green 1 5 4 4 red 2 1 4 2 yellow 0 2 2 3}
    2,6 {7 blue 1 1 3 0 cyan 2 5 4 6 darkorange 0 5 2 2 green 0 6 1 5 magenta 3 5 4 1 red 4 0 5 6 yellow 1 4 4 2}
    2,7 {7 blue 3 1 3 3 darkorange 2 0 4 2 green 1 0 2 1 red 1 1 1 5 yellow 4 1 4 5}
    2,8 {7 blue 4 3 4 6 cyan 0 6 1 1 darkorange 1 6 5 1 green 0 4 6 5 magenta 5 3 6 6 red 3 3 3 6 yellow 3 2 5 2}
    2,9 {7 blue 2 4 2 6 cyan 1 1 4 6 darkorange 0 5 1 0 green 1 2 4 5 red 0 6 3 6 yellow 3 1 5 5}
    2,10 {7 blue 2 4 6 4 cyan 0 1 6 0 darkorange 1 1 6 2 green 5 2 6 5 red 3 3 5 5 yellow 4 3 6 3}
    2,11 {7 blue 1 0 2 3 cyan 1 2 3 3 darkorange 3 1 5 4 green 5 1 5 3 magenta 1 1 4 0 red 1 5 5 5 yellow 3 4 5 0}
    2,12 {7 blue 5 5 6 2 cyan 3 0 6 0 darkorange 2 2 6 6 green 2 0 2 3 magenta 3 1 6 1 red 1 5 2 1 yellow 3 6 4 3}
    2,13 {7 blue 1 2 1 4 cyan 2 4 3 3 darkorange 0 6 3 6 green 4 0 5 6 red 1 1 1 5 yellow 0 5 4 6}
    2,14 {7 blue 3 2 4 1 brown 1 2 5 1 cyan 1 4 6 0 darkorange 1 1 3 1 green 2 2 4 3 magenta 1 5 6 6 red 1 3 2 6 yellow 4 5 6 3}
    2,15 {7 blue 0 2 3 1 darkorange 0 1 1 0 green 1 2 3 3 red 1 1 1 4 yellow 1 5 5 1}
    2,16 {7 blue 3 3 4 5 darkorange 3 2 5 5 green 4 6 5 1 red 5 2 5 6 yellow 6 0 6 2}
    2,17 {7 blue 2 1 3 4 cyan 4 1 6 2 darkorange 3 1 3 5 green 5 1 5 6 magenta 1 1 2 4 red 0 6 4 5 yellow 3 2 5 5}
    2,18 {7 blue 2 5 5 3 cyan 4 6 6 6 darkorange 4 5 6 5 green 1 1 5 2 magenta 3 6 5 0 red 2 6 5 1 yellow 1 5 2 2}
    2,19 {7 blue 4 6 6 6 cyan 1 5 4 5 darkorange 5 5 6 2 green 3 5 4 3 red 3 6 6 1 yellow 0 3 6 0}
    2,20 {7 blue 2 1 3 3 darkorange 1 3 4 1 green 0 0 0 2 red 0 3 1 2 yellow 2 4 3 1}
    2,21 {7 blue 0 0 1 4 cyan 3 0 6 0 darkorange 0 4 2 3 green 1 0 3 3 red 1 5 5 2 yellow 2 0 3 1}
    2,22 {7 blue 1 4 3 2 cyan 4 5 5 1 darkorange 4 6 6 0 green 1 2 2 0 magenta 1 5 5 0 red 0 0 1 3 yellow 5 2 5 5}
    2,23 {7 blue 4 5 6 5 cyan 0 6 4 3 darkorange 1 6 3 3 green 0 0 4 4 red 0 4 5 3 yellow 3 4 6 6}
    2,24 {7 blue 5 4 6 6 cyan 1 5 5 6 darkorange 0 6 2 0 green 1 6 4 1 red 6 0 6 3 yellow 3 3 4 6}
    2,25 {7 blue 2 1 6 5 cyan 4 1 6 4 darkorange 3 1 5 5 green 0 0 6 3 red 0 1 1 5 yellow 0 6 1 1}
    2,26 {7 blue 0 2 6 0 darkorange 1 5 4 5 green 0 1 4 1 red 2 2 5 3 yellow 5 0 5 5}
    2,27 {7 blue 0 3 6 6 darkorange 2 1 3 3 green 1 5 4 5 red 0 4 3 1 yellow 1 4 2 2}
    2,28 {7 blue 0 5 6 1 cyan 4 0 5 5 darkorange 4 1 6 0 green 0 2 3 4 magenta 0 0 1 3 red 1 5 3 3 yellow 1 0 2 3}
    2,29 {7 blue 2 2 2 4 cyan 3 1 4 4 darkorange 5 3 6 6 green 4 3 5 0 red 2 1 4 5 yellow 5 1 5 4}
    2,30 {7 blue 0 5 3 6 cyan 1 5 3 4 darkorange 0 0 4 0 green 0 2 0 4 magenta 1 2 2 4 red 4 1 5 5 yellow 1 0 4 2}
    3,1 {8 blue 3 4 5 4 cyan 1 4 2 7 darkorange 3 3 4 4 green 1 6 2 4 red 0 4 7 1 yellow 1 7 2 5}
    3,2 {8 blue 0 1 5 5 cyan 0 2 7 3 darkorange 1 6 7 1 green 3 3 5 0 red 0 0 7 0 yellow 3 0 3 2}
    3,3 {8 blue 2 2 5 7 cyan 4 4 6 1 darkorange 5 3 7 6 green 4 7 7 7 red 0 1 4 3 yellow 1 3 1 6}
    3,4 {8 blue 5 7 6 3 cyan 1 6 3 6 darkorange 4 7 5 2 green 1 7 3 1 magenta 2 3 3 7 red 4 4 6 2 yellow 0 0 6 7}
    3,5 {8 blue 0 7 4 5 cyan 3 3 6 1 darkorange 7 2 7 7 green 0 6 4 1 red 1 3 3 1 yellow 3 6 7 1}
    3,6 {8 blue 0 7 4 6 cyan 6 2 7 6 darkorange 1 4 4 7 green 6 1 7 7 magenta 1 0 5 4 red 0 0 5 7 yellow 2 0 7 1}
    3,7 {8 blue 3 1 4 4 darkorange 1 0 2 4 green 2 2 4 1 red 3 6 6 1 yellow 0 7 1 5}
    3,8 {8 blue 5 2 5 7 cyan 0 5 6 4 darkorange 0 6 2 1 green 0 7 5 1 magenta 5 3 6 1 red 5 4 7 7 yellow 4 4 6 7}
    3,9 {8 blue 1 1 4 0 cyan 4 5 5 1 darkorange 2 2 3 0 green 1 2 4 3 red 3 5 5 0 yellow 1 6 6 6}
    3,10 {8 blue 0 7 4 6 cyan 0 3 0 5 darkorange 1 7 4 2 green 1 1 1 4 red 4 4 7 0 yellow 3 1 6 7}
    3,11 {8 blue 7 1 7 3 cyan 1 6 3 6 darkorange 4 3 5 6 green 0 5 2 4 magenta 0 6 7 0 red 5 3 6 6 yellow 3 3 4 1}
    3,12 {8 blue 2 4 2 6 cyan 1 4 6 6 darkorange 4 7 5 5 green 1 6 3 1 red 0 1 7 4 yellow 0 6 5 2}
    3,13 {8 blue 6 4 6 6 cyan 3 6 5 2 darkorange 0 0 5 6 green 2 5 4 4 red 0 7 3 7 yellow 2 3 6 0}
    3,14 {8 blue 1 4 3 3 cyan 4 7 5 2 darkorange 7 0 7 5 green 5 3 7 7 red 2 5 4 6 yellow 0 2 7 6}
    3,15 {8 blue 2 5 6 2 cyan 6 5 6 7 darkorange 4 4 5 7 green 0 1 7 3 red 3 6 7 7 yellow 2 4 4 3}
    3,16 {8 blue 3 4 6 3 cyan 2 4 6 2 darkorange 1 4 4 0 green 0 0 0 7 magenta 0 6 6 6 red 3 2 5 2 yellow 4 4 5 0}
    3,17 {8 blue 0 0 7 6 brown 3 1 3 4 cyan 4 0 5 4 darkorange 3 0 4 6 green 5 6 7 4 magenta 2 1 5 5 red 4 4 6 1 yellow 5 3 6 2}
    3,18 {8 blue 1 0 2 2 brown 3 5 4 2 cyan 0 0 2 0 darkorange 0 4 5 4 green 2 7 7 7 magenta 4 3 5 2 purple 3 0 3 6 red 1 5 1 7 yellow 1 6 2 5}
    3,19 {8 blue 3 4 4 6 brown 1 1 2 6 cyan 0 1 3 2 darkorange 0 6 2 4 green 6 1 6 6 magenta 3 3 4 0 red 1 4 2 1 yellow 4 5 5 6}
    3,20 {8 blue 5 5 6 3 brown 6 2 7 4 cyan 4 7 7 5 darkorange 0 2 6 1 green 3 0 7 3 magenta 1 4 1 6 purple 0 5 2 7 red 0 4 3 7 yellow 1 1 3 5}
    3,21 {8 blue 0 7 4 7 brown 0 5 7 1 cyan 4 5 6 6 darkorange 0 6 2 6 green 2 1 7 5 magenta 5 3 7 2 red 3 3 6 1 yellow 4 1 7 3}
    3,22 {8 blue 0 6 2 2 cyan 1 2 6 1 darkorange 0 4 1 5 green 2 3 6 6 red 1 6 3 4 yellow 4 5 7 1}
    3,23 {8 blue 1 2 2 6 cyan 0 7 1 4 darkorange 1 3 6 6 green 0 0 6 4 magenta 1 5 7 3 red 5 4 6 1 yellow 4 1 6 5}
    3,24 {8 blue 4 6 5 5 cyan 1 2 2 3 darkorange 0 2 1 1 green 0 1 7 0 magenta 3 3 5 6 red 2 5 4 5 yellow 3 1 7 1}
    3,25 {8 blue 1 4 6 6 cyan 0 3 7 6 darkorange 3 1 7 0 green 5 3 6 0 magenta 0 0 2 1 red 1 3 7 2 yellow 1 1 4 3}
    3,26 {8 blue 0 0 2 2 brown 2 5 4 4 cyan 1 1 3 1 darkorange 1 3 7 0 green 3 2 5 5 magenta 4 2 5 4 red 5 0 5 6 yellow 1 0 5 2}
    3,27 {8 blue 3 5 6 2 cyan 2 7 6 5 darkorange 1 7 7 3 green 3 4 5 2 magenta 1 1 6 3 red 6 7 7 4 yellow 5 5 6 4}
    3,28 {8 blue 1 7 7 3 cyan 3 6 7 4 darkorange 1 3 7 7 green 3 3 5 1 magenta 1 2 3 1 red 4 1 5 4 yellow 2 5 6 1}
    3,29 {8 blue 0 3 3 7 cyan 1 6 6 6 darkorange 2 3 6 5 green 1 1 3 5 red 2 1 5 2 yellow 3 1 6 4}
    3,30 {8 blue 4 3 6 1 cyan 1 6 3 6 darkorange 0 4 0 6 green 2 2 4 2 magenta 0 5 3 5 red 1 4 6 3 yellow 5 5 6 2}
    4,1 {9 blue 1 3 2 7 brown 5 7 7 1 cyan 1 2 2 3 darkorange 2 4 2 6 green 4 1 4 3 magenta 3 7 5 1 purple 5 8 6 1 red 1 1 4 4 yellow 5 0 6 2}
    4,2 {9 blue 0 0 3 7 brown 0 7 3 0 cyan 4 7 7 5 darkorange 5 1 7 1 green 4 3 8 3 magenta 3 5 5 5 red 3 3 7 2 yellow 5 4 8 2}
    4,3 {9 blue 0 2 1 0 cyan 3 1 7 1 darkorange 4 4 6 4 green 6 3 7 6 magenta 2 5 4 0 red 7 5 8 8 yellow 3 0 3 8}
    4,4 {9 blue 4 8 8 8 cyan 0 8 6 4 darkorange 0 1 1 3 green 1 8 3 4 magenta 5 8 7 8 red 3 8 4 4 yellow 0 0 3 7}
    4,5 {9 blue 1 7 6 5 brown 2 5 6 4 cyan 6 7 7 2 darkorange 1 0 7 1 green 0 0 3 3 magenta 2 0 6 8 red 5 3 7 7 yellow 1 4 3 6}
    4,6 {9 blue 3 5 6 4 brown 6 5 8 6 cyan 4 4 7 4 darkorange 3 4 7 0 green 8 0 8 4 magenta 3 6 6 0 purple 1 5 6 7 red 4 6 7 7 white 5 0 8 7 yellow 1 1 1 4}
    4,7 {9 blue 2 7 5 7 brown 6 7 8 8 cyan 2 3 6 3 darkorange 4 2 6 6 green 2 1 6 4 magenta 0 6 7 8 purple 1 7 5 6 red 1 2 3 1 white 0 4 5 2 yellow 0 0 8 0}
    4,8 {9 blue 0 0 1 8 brown 5 2 6 4 cyan 2 3 8 8 darkorange 2 8 3 5 green 1 0 7 4 magenta 1 5 1 7 red 4 7 6 7 yellow 6 2 6 6}
    4,9 {9 blue 0 0 3 8 brown 0 1 2 8 cyan 2 7 6 2 darkorange 0 3 3 3 green 1 7 4 5 magenta 2 6 4 6 red 6 7 7 4 yellow 1 1 6 6}
    4,10 {9 blue 7 6 8 8 cyan 5 1 8 5 darkorange 7 5 7 8 green 6 1 6 8 magenta 2 6 5 6 red 2 2 6 6 yellow 4 3 7 1}
    4,11 {9 blue 4 2 5 3 brown 4 0 8 0 cyan 1 1 2 5 darkorange 1 4 7 7 green 7 2 8 5 magenta 4 4 8 4 purple 3 0 5 1 red 1 2 6 5 yellow 0 0 4 3}
    4,12 {9 blue 4 8 5 6 brown 2 0 7 7 cyan 1 1 1 4 darkorange 1 6 2 1 green 5 2 5 5 magenta 3 2 8 4 red 1 7 3 3 yellow 6 2 7 6}
    4,13 {9 blue 3 4 5 7 brown 3 2 4 4 cyan 5 5 7 6 darkorange 4 5 7 7 green 1 7 7 1 magenta 4 2 6 4 red 5 4 8 3 yellow 2 2 2 7}
    4,14 {9 blue 6 4 6 6 brown 1 1 2 7 cyan 6 1 8 0 darkorange 1 4 7 0 green 5 7 6 3 magenta 2 6 3 4 purple 2 1 3 3 red 1 3 4 5 yellow 4 8 6 2}
    4,15 {9 blue 2 7 4 2 cyan 0 0 4 3 darkorange 1 0 1 7 green 5 3 6 1 magenta 4 6 6 6 red 3 2 3 4 yellow 2 0 4 0}
    4,16 {9 blue 2 2 2 5 brown 0 7 6 7 cyan 7 1 8 8 darkorange 0 6 3 1 green 0 8 5 6 magenta 6 3 7 2 purple 4 6 5 1 red 0 4 6 4 yellow 1 6 3 2}
    4,17 {9 blue 1 3 4 6 cyan 4 7 7 0 darkorange 3 3 6 6 green 4 8 8 0 red 1 4 1 6 yellow 1 7 4 5}
    4,18 {9 blue 1 4 7 1 brown 4 3 7 3 cyan 0 8 8 8 darkorange 6 5 8 7 green 4 4 7 6 magenta 5 5 5 7 purple 2 6 3 3 red 1 6 7 2 yellow 4 5 8 6}
    4,19 {9 blue 1 6 5 7 brown 1 4 1 7 cyan 4 7 8 8 darkorange 5 1 7 5 green 0 7 4 5 magenta 1 3 4 1 purple 2 4 6 2 red 3 3 7 6 yellow 3 4 4 6}
    4,20 {9 blue 1 1 6 3 brown 3 8 4 4 cyan 1 7 6 8 darkorange 3 0 6 5 green 3 1 3 6 magenta 5 6 8 8 purple 5 7 7 8 red 0 5 2 4 yellow 0 4 6 2}
    4,21 {9 blue 3 6 5 3 cyan 4 2 7 2 darkorange 1 1 6 5 green 3 2 7 8 magenta 2 6 6 8 red 5 2 6 6 yellow 5 5 7 7}
    4,22 {9 blue 5 1 7 2 brown 0 5 0 8 cyan 3 6 7 7 darkorange 0 4 6 4 green 4 7 5 2 magenta 1 4 2 1 purple 2 2 4 4 red 2 6 5 8 yellow 2 8 6 2}
    4,23 {9 blue 4 0 8 0 brown 1 5 4 6 cyan 1 8 7 7 darkorange 1 4 2 1 green 2 6 8 7 magenta 1 6 3 8 purple 5 2 6 6 red 3 3 6 7 yellow 2 4 6 4}
    4,24 {9 blue 1 1 4 3 brown 1 4 4 7 cyan 4 4 7 6 darkorange 0 2 6 8 green 1 3 5 8 magenta 1 2 6 2 red 2 3 7 7 yellow 2 4 5 7}
    4,25 {9 blue 2 7 6 3 brown 1 4 2 6 cyan 0 0 8 0 darkorange 4 7 6 4 green 0 1 6 8 magenta 0 8 4 3 red 1 5 6 6 yellow 0 2 6 7}
    4,26 {9 blue 7 4 8 0 brown 1 7 5 2 cyan 2 7 5 6 darkorange 7 6 7 8 green 0 4 3 5 magenta 4 0 7 3 purple 4 4 8 8 red 1 4 2 1 yellow 2 2 6 6}
    4,27 {9 blue 3 5 4 3 brown 0 2 8 1 cyan 0 3 6 4 darkorange 1 5 7 6 green 3 3 6 6 magenta 5 1 7 1 red 1 4 7 3 yellow 0 1 3 0}
    4,28 {9 blue 2 6 8 4 cyan 3 6 7 4 darkorange 2 4 7 6 green 1 1 7 3 magenta 6 6 7 5 red 5 0 7 1 yellow 1 4 2 7}
    4,29 {9 blue 4 1 4 5 brown 4 2 4 4 cyan 0 0 3 7 darkorange 1 0 1 4 green 5 7 7 3 magenta 1 7 8 1 red 4 7 5 5 yellow 2 7 6 2}
    4,30 {9 blue 1 1 8 0 brown 2 0 7 3 cyan 0 7 3 3 darkorange 4 7 7 7 green 0 8 4 1 magenta 5 4 7 6 purple 7 8 8 5 red 0 6 2 3 yellow 6 6 6 8}
    5,1 {9 blue 0 6 3 6 cyan 4 6 6 7 darkorange 0 0 3 5 green 0 7 5 3 magenta 7 7 8 6 red 2 1 2 3 yellow 0 8 8 7}
    5,2 {9 blue 0 0 0 8 brown 7 6 7 8 cyan 2 5 5 3 darkorange 2 0 4 0 green 5 0 8 8 magenta 4 4 5 2 red 1 0 4 5 yellow 5 1 6 6}
    5,3 {9 blue 0 5 4 5 brown 3 2 7 2 cyan 7 8 8 0 darkorange 0 0 0 4 green 0 6 6 8 magenta 2 3 8 8 purple 3 3 6 4 red 0 8 5 8 yellow 0 7 5 7}
    5,4 {9 blue 0 8 8 1 cyan 8 2 8 8 darkorange 0 5 8 0 green 2 3 5 3 red 5 4 6 3 yellow 2 2 2 4}
    5,5 {9 blue 0 0 0 6 cyan 5 6 8 8 darkorange 0 8 6 6 green 0 5 6 1 red 7 3 7 6 yellow 4 5 8 0}
    5,6 {9 blue 0 0 4 0 brown 6 2 7 6 cyan 4 2 5 6 darkorange 0 2 0 7 green 0 1 3 6 magenta 5 2 5 5 purple 4 1 7 5 red 2 3 7 7 white 0 8 5 0 yellow 1 7 2 2}
    5,7 {9 blue 0 7 3 7 brown 5 2 5 7 cyan 1 5 4 5 darkorange 0 6 4 7 green 0 8 1 4 magenta 7 1 7 5 purple 0 0 0 5 red 4 0 7 8 yellow 1 0 2 0}
    5,8 {9 blue 0 0 0 7 brown 7 4 7 8 cyan 3 2 4 8 darkorange 0 8 3 8 green 1 7 8 0 magenta 5 3 7 3 purple 7 2 8 8 red 3 1 5 2 yellow 2 1 3 3}
    5,9 {9 blue 0 1 0 8 brown 8 0 8 8 cyan 6 1 6 6 darkorange 0 0 1 7 green 3 7 4 1 magenta 7 1 7 6 purple 1 8 7 8 red 5 1 7 7 yellow 2 7 7 0}
    5,10 {9 blue 0 7 3 3 cyan 3 7 7 1 darkorange 0 8 8 8 green 1 7 3 4 red 2 7 8 7 yellow 0 0 5 0}
    5,11 {9 blue 7 8 8 0 brown 5 4 5 7 cyan 0 3 5 8 darkorange 8 1 8 8 green 3 2 6 8 magenta 1 3 1 7 purple 2 3 5 3 red 2 2 6 0 white 2 4 2 7 yellow 1 1 6 1}
    5,12 {9 blue 0 7 8 0 brown 7 2 7 4 cyan 3 2 3 8 darkorange 0 8 2 8 green 1 7 5 7 magenta 4 2 7 5 red 2 2 2 7 yellow 6 7 8 4}
    5,13 {9 blue 1 2 1 8 brown 6 4 7 4 cyan 4 4 8 8 darkorange 0 8 8 7 green 0 0 8 0 magenta 5 4 5 7 purple 3 3 3 8 red 4 3 7 3 yellow 2 8 7 2}
    5,14 {9 blue 0 1 6 2 brown 3 6 6 4 cyan 2 7 4 6 darkorange 0 0 7 2 green 0 3 0 8 magenta 4 5 6 5 purple 3 7 8 7 red 0 2 5 2 white 8 2 8 6 yellow 1 3 8 8}
    5,15 {9 blue 0 8 5 8 cyan 5 7 7 8 darkorange 2 0 2 7 green 3 0 8 8 magenta 6 3 6 8 red 4 4 4 7 yellow 3 7 7 1}
    5,16 {9 blue 0 2 0 5 brown 5 1 6 6 cyan 3 2 3 5 darkorange 1 0 4 1 green 0 6 5 6 magenta 2 0 7 6 purple 5 2 5 5 red 2 2 2 5 white 8 2 8 5 yellow 0 8 8 6}
    5,17 {9 blue 0 0 7 8 brown 8 0 8 8 cyan 2 2 5 2 darkorange 5 7 6 1 green 0 8 6 8 magenta 6 2 6 7 red 2 5 5 5 yellow 1 2 5 6}
    5,18 {9 blue 0 1 5 1 brown 6 1 6 8 cyan 1 7 2 4 darkorange 0 2 5 8 green 0 0 8 8 magenta 3 4 3 6 purple 7 1 7 8 red 0 8 4 8 yellow 0 3 0 7}
    5,19 {9 blue 0 7 4 1 brown 4 6 4 8 cyan 2 7 3 4 darkorange 0 1 8 0 green 0 8 4 4 magenta 4 3 8 3 purple 6 2 8 2 red 2 2 8 1 yellow 1 7 3 3}
    5,20 {9 blue 0 1 2 1 brown 3 2 4 5 cyan 1 8 2 8 darkorange 0 0 8 8 green 0 2 2 2 magenta 3 5 3 8 purple 5 2 5 7 red 1 4 4 2 white 7 3 7 8 yellow 0 8 3 3}
    5,21 {9 blue 0 4 3 4 darkorange 0 1 0 2 green 1 2 4 2 red 7 7 8 2 yellow 0 0 8 3}
    5,22 {9 blue 0 1 7 1 brown 6 3 6 5 cyan 4 2 5 2 darkorange 0 0 3 3 green 0 8 3 2 magenta 5 3 5 5 red 2 3 2 7 yellow 1 3 8 8}
    5,23 {9 blue 0 0 2 8 brown 7 1 7 5 cyan 6 1 8 7 darkorange 0 8 2 7 green 1 2 1 8 magenta 5 8 8 8 red 4 8 5 1 yellow 4 6 7 6}
    5,24 {9 blue 4 3 6 3 brown 3 8 8 0 cyan 2 1 2 8 darkorange 4 2 6 2 green 5 1 5 5 magenta 3 7 7 0 red 1 6 3 6 yellow 0 0 0 8}
    5,25 {9 blue 1 1 5 0 brown 3 3 5 2 cyan 1 3 7 7 darkorange 0 0 4 4 green 2 1 5 1 magenta 2 3 7 0 red 7 1 7 6 yellow 0 3 8 0}
    5,26 {9 blue 0 0 7 1 cyan 2 5 2 6 darkorange 0 1 6 1 green 0 2 1 4 magenta 0 4 8 0 red 2 4 6 4 yellow 0 3 6 3}
    5,27 {9 blue 1 1 5 1 cyan 2 5 7 5 darkorange 0 1 8 5 green 2 2 2 4 magenta 1 5 7 7 red 1 2 2 6 yellow 1 4 4 3}
    5,28 {9 blue 1 0 7 0 brown 5 8 8 8 cyan 0 7 3 4 darkorange 0 0 0 6 green 1 6 8 0 magenta 0 8 4 4 red 2 6 5 3 yellow 2 2 6 3}
    5,29 {9 blue 0 1 8 2 brown 1 7 8 3 cyan 5 5 7 5 darkorange 0 0 7 0 green 4 2 4 4 magenta 5 6 7 6 red 4 5 5 4 yellow 3 5 8 8}
    5,30 {9 blue 1 1 1 3 brown 6 2 8 2 cyan 3 0 3 5 darkorange 2 2 8 8 green 1 4 6 3 magenta 4 0 5 3 red 2 3 4 3 yellow 5 4 5 6}
}
################################################################
proc DoDisplay {} {
    wm title . "Flow Colors"
    set sz [expr {2*$::S(margin) + $::S(sz) * 6}]
    set ::S(X0) [expr {$sz/2}]
    canvas .c -width $sz -height $sz -bd 0 -highlightthickness 0 -bg $::CLR(bg)
    pack .c -side top -fill both -expand 1

    bind .c <Configure> {Recenter %W %h %w}
    bind .c <1> {DoButton down %x %y}
    bind .c <B1-Motion> {DoButton move %x %y}
    bind .c <ButtonRelease-1> {DoButton up %x %y}
    if {[file exists ~/misc/tcl/console.tcl]} {
        uplevel #0 source ~/misc/tcl/console.tcl
        bind all <F12> {console show}
    }
}
proc DrawConstants {} {
    global S CLR B
    .c create rect -$::S(X0) -$::S(X0) $::S(X0) $::S(X0) -tag border -fill {} \
        -outline white -width 5
    set top [lindex [Cell2XY 0 0] 0 1]
    set y [expr {(-$::S(X0) + $top) / 2}]
    set x [expr {abs($y)}]
    .c create text 0 $y -text "Flow Colors" -font myDisplayFontTitle \
        -anchor c -fill red
    set star [MakeStar $x $y [expr {$top - $y - 5}]]
    .c create poly $star -fill $CLR(star) -outline $CLR(star) -tag solvedStar

    lassign [lindex [Cell2XY $::B(N) 0] 0] xLeft y
    lassign [lindex [Cell2XY $::B(N) $::B(N)] 0] xRight
    incr y 5
    .c create text $xLeft $y -font myDisplayFont -fill $::CLR(txt) \
        -anchor nw -tag level,txt

    # Navigation buttons
    .c create image -60 $y -image ::img::left  -anchor n -tag prev
    .c create image   0 $y -image ::img::undo  -anchor n -tag undo
    .c create image  60 $y -image ::img::right -anchor n -tag next

    # Help
    .c create image $xRight $y -image ::img::help -anchor ne -tag help
    CanvasButtonBinding .c help "" "" Help
    ::tooltip::tooltip .c -items help "Help"
    .c create image [expr {$xRight-48-5}] $y -image ::img::up -anchor ne -tag up
}    
proc DrawBoard {stage level} {
    global B S L BOARDS

    set S(stage) $stage
    set S(level) $level
    set S(level,txt) "Stage $stage\nLevel $level"
    set S(stages) [llength [array names BOARDS *,30]]

    unset -nocomplain B
    set boardSpec [lassign $BOARDS($stage,$level) N]
    ComputeSizes $N
    set B(N) $N
    set B(xy0) [expr {round(-$N/2. * $S(sz))}]
    set B(almost) 0

    .c delete all
    DrawConstants
    
    for {set row 0} {$row < $N} {incr row} {
        for {set col 0} {$col < $N} {incr col} {
            lassign [Cell2XY $row $col] xy
            .c create rect $xy -tag cell_${row},$col -fill $::CLR(bg) \
                -outline $::CLR(fg)
            set B($row,$col) {}
        }
    }

    # Draw all the nodes
    unset -nocomplain L
    foreach {clr row1 col1 row2 col2} $boardSpec {
        lassign [Cell2XY $row1 $col1] . xy1
        lassign [Cell2XY $row2 $col2] . xy2
        set id1 [.c create oval $xy1 -fill $clr -outline $clr -tag node]
        set id2 [.c create oval $xy2 -fill $clr -outline $clr -tag node]
        set B($row1,$col1) [list node $clr]
        set B($row2,$col2) [list node $clr]
        set L(path,$clr) {}
        set L(delete,$clr) {}
        set L(done,$clr) 0
        .c bind $id1 <Shift-Double-Button-3> [list DoHint $clr]
        .c bind $id2 <Shift-Double-Button-3> [list DoHint $clr]
    }

    # Level indicator
    .c itemconfig level,txt -text $S(level,txt) -anchor nw
    # Button bindings and tooltips
    CanvasButtonBinding .c prev "" "" {PlayAgain -1}
    CanvasButtonBinding .c undo "" "" {PlayAgain 0}
    CanvasButtonBinding .c next "" "" {PlayAgain 1}
    ::tooltip::tooltip .c -items prev "Previous puzzle"
    ::tooltip::tooltip .c -items undo "Restart puzzle"
    ::tooltip::tooltip .c -items next "Next puzzle"

    # Choose level button
    CanvasButtonBinding .c up "" "" ShowPickPuzzlePage
    ::tooltip::tooltip .c -items up "Choose level"

    .c itemconfig solvedStar \
        -state [expr {[HasBeenSolved $S(stage) $S(level)] ? "" : "hidden"}]
}
proc DrawPickPuzzlePage {} {
    global S B CLR
    set N 6
    ComputeSizes $N
    set B(N) $N
    set B(xy0) [expr {round(-$N/2. * $S(sz))}]

    .c delete all
    DrawConstants
    .c itemconfig solvedStar -state hidden
    for {set row 0} {$row < 5} {incr row} {
        for {set col 0} {$col < $N} {incr col} {
            for {set stage 1} {$stage <= $S(stages)} {incr stage} {
                set num [expr {1 + $row*$N + $col}]
                set fauxCol [expr {$col + ($stage - $S(stage))*$N}]
                set txt_tag "pick$stage,$num"
                lassign [Cell2XY [expr {$row+0}] $fauxCol] . xy x y
                set box_tag [.c create oval $xy -fill black -outline white \
                                 -width 2 -tag [list oval stage stage,$stage]]
                if {[HasBeenSolved $stage $num]} {
                    set star [MakeStar $x $y [expr {$S(radius) - 1}]]
                    .c create poly $star -fill $CLR(star) -outline $CLR(star) \
                        -tag [list star stage stage,$stage $txt_tag]
                }
                incr x 1 ; incr y 2
                .c create text $x $y -text $num -fill white \
                    -font "Helvetica 32 bold" \
                    -tag [list txt stage stage,$stage $txt_tag]
                CanvasButtonBinding .c $txt_tag $box_tag \
                    $::CLR(dialog,highlight) [list PlayChosenPuzzle $num]
            }
        }
    }
    .c itemconfig stage -state hidden
    .c itemconfig stage,$S(stage) -state {}
    
    # Stage and Help
    set N [lindex $::BOARDS($S(stage),1) 0]
    set range "\n([expr {$S(stage)*30-29}]-[expr {$S(stage)*30}])"
    .c itemconfig level,txt -text "$N x $N$range" -anchor w

    # Navigation buttons
    .c delete undo
    CanvasButtonBinding .c prev "" "" {ShiftStage -1}
    CanvasButtonBinding .c next "" "" {ShiftStage 1}
    ::tooltip::tooltip .c -items prev "Previous stage"
    ::tooltip::tooltip .c -items next "Next stage"
    StageButtons $S(stage)

    .c delete up
}
proc HasBeenSolved {stage level} {
    return [expr {[lsearch $::S(solved) $stage,$level] > -1}]
}
proc StageButtons {which} {
    if {[.c find withtag stageButton] eq ""} {
        lassign [.c bbox prev] . . x0 .
        lassign [.c bbox next] x1 y0 . y1
        set gap [expr {($x1 - $x0)/double($::S(stages))}]
        set y [expr {($y0 + $y1) / 2}]
        for {set stage 1} {$stage <= $::S(stages)} {incr stage} {
            set x [expr {$x0 - $gap/2 + $stage * $gap}]
            set xy [Box $x $y $::S(stageButton,size)]
            .c create oval $xy -tag [list stageButton stageButton,$stage] \
                -width 1
        }
    }
    .c itemconfig stageButton -fill $::CLR(stageButton,off) \
        -outline $::CLR(stageButton,off)
    .c itemconfig stageButton,$which -fill $::CLR(stageButton,on) \
        -outline $::CLR(stageButton,on)
}
proc ShiftStage {dir} {
    global S

    if {$dir < 0 && $S(stage) == 1} return
    if {$dir > 0 && $S(stage) == $S(stages)} return
    set nextStage [expr {$S(stage) + $dir}]
    set N [lindex $::BOARDS($nextStage,1) 0]
    set range "\n([expr {$nextStage*30-29}]-[expr {$nextStage*30}])"
    .c itemconfig level,txt -text "$N x $N$range"
    .c itemconfig stage,$nextStage -state {}
    StageButtons $nextStage

    lassign [.c bbox stage,$S(stage)] x0
    lassign [.c bbox stage,$nextStage] x1
    lassign $S(shiftStage,params) steps delay
    set delta [expr {($x0 - $x1) / double($steps)}]
    AnimateMove stage $delta 0 0
    MyWait
    
    .c itemconfig stage,$S(stage) -state hidden
    set S(stage) $nextStage
}
proc AnimateMove {tag xDelta yDelta step} {
    lassign $::S(shiftStage,params) steps delay
    .c move $tag $xDelta $yDelta
    
    incr step
    if {$step < $steps} {
        after $delay [list AnimateMove $tag $xDelta $yDelta $step]
    } else {
        set ::S(wait) 1
    }
}


proc DoButton {action x y} {
    global L B
    if {$::S(state) ne "play"} return
    lassign [XY2Cell [.c canvasy $y] [.c canvasx $x]] row col
    if {$row < 0 || $row >= $B(N) || $col < 0 || $col >= $B(N)} return
    lassign $B($row,$col) what clr
    
    if {$action eq "down"} {
        if {$what eq ""} return

        if {$what eq "node"} {
            # Starting from a node
            set L(delete,$clr) $L(path,$clr)
            set L(path,$clr) [list [list $row $col]]
            set L(done,$clr) 0
            set L(clr) $clr
            array unset L stolen,*
            ShowPath $L(clr)
        } else {
            # Starting from the middle of a path
            set L(clr) $clr
            array unset L stolen,*
            AdjustPath $row $col $L(clr)
            ShowPath $L(clr)
        }
        return
    }
    if {! [info exists L(clr)]} return
    
    if {$action eq "move" && $L(clr) ne ""} {
        lassign [lindex $L(path,$L(clr)) end] lastRow lastCol
        set drow [expr {abs($row - $lastRow)}]
        set dcol [expr {abs($col - $lastCol)}]
        if {! (($drow == 1 && $dcol == 0) || ($drow == 0 && $dcol == 1))} return
        
        set stolen [StealCell $row $col $L(clr)]
        if {$stolen eq "node"} return
        AdjustPath $row $col $L(clr)
        if {$stolen eq "endNode"} {
            set L(done,$clr) 1
        }
        ShowPath $L(clr)
        if {$stolen eq "endNode"} {             ;# Is path complete?
            set L(clr) ""
        }
        CheckUnsteal
        return
    }

    if {$action eq "up"} {
        unset L(clr)

        if {$what ne "node"} return
        CheckVictory
    }
}
# Handles toClr's pipe wanting to move to row,col
# which may cause another pipe to be truncated
proc StealCell {row col toClr} {
    global L B

    lassign $B($row,$col) who oldClr
    if {$who eq ""} {return empty}
    set n [lsearch -exact $L(path,$oldClr) [list $row $col]]
    if {$oldClr eq $toClr} {
        if {$who ne "node"} { return self }
        if {$n == -1} { return endNode }
        return startNode
    }
    if {$who eq "node"} {return node}

    # Here when truncating oldClr's path
    set n [lsearch -exact $L(path,$oldClr) [list $row $col]]
    if {$n == -1} {
        tk_messageBox -icon error \
            -message "B and L messed up for $row $col $toClr"
        return
    }
    # Remember then truncate clr's pipe
    #set L(stolen,$row,$col) [list $oldClr $L(path,$oldClr)]
    lappend L(stolen,$oldClr) [list $row $col $L(done,$oldClr) $L(path,$oldClr)]
    set L(delete,$oldClr) [lrange $L(path,$oldClr) $n end]
    set L(path,$oldClr) [lrange $L(path,$oldClr) 0 $n-1]
    set L(done,$oldClr) 0
    ShowPath $oldClr
    return steal
}
proc CheckUnsteal {} {
    global L B
    foreach arr [array names L stolen,*] {
        set clr [lindex [split $arr ","] 1]
        # NB. ordering is very important: search from end of old path
        # backwards, then if found we can ignore everything closer to beginning
        for {set idx 0} {$idx < [llength $L($arr)]} {incr idx} {
            set steal [lindex $L($arr) $idx]
            lassign $steal row col done oldPath
            if {$B($row,$col) ne ""} continue
            set L(path,$clr) $oldPath
            set L(delete,$clr) ""
            set L(done,$clr) $done
            set L($arr) [lrange $L($arr) 0 $idx-1]
            ShowPath $clr
            break
        }
    }
}
# Adds row, col to clr's path, truncating path if it intersects itself
proc AdjustPath {row col clr} {
    global L

    set L(delete,$clr) {}
    set n [lsearch -exact $L(path,$clr) [list $row $col]]
    if {$n + 1 == [llength $L(path,$clr)]} return
    if {$n > -1} {
        set L(delete,$clr) [lrange $L(path,$clr) $n+1 end]
        set L(path,$clr) [lrange $L(path,$clr) 0 $n]
    } else {
        lappend L(path,$clr) [list $row $col]
    }
}

# draws path for clr, deleting everything in L(delete,...) and
# drawing L(path,...)
proc ShowPath {clr} {
    global L S B

    # Stuff to be deleted
    foreach cell $L(delete,$clr) {
        lassign $cell row col
        if {[lindex $B($row,$col) 0] ne "node"} {
            set B($row,$col) ""
        }
        .c itemconfig cell_${row},$col -fill $::CLR(bg)
    }
    set L(delete,$clr) {}
    
    set xy {}
    foreach cell $L(path,$clr) {
        lassign $cell row col
        if {[lindex $B($row,$col) 0] ne "node"} {
            set B($row,$col) [list path $clr]
        }
        lassign [Cell2XY $row $col] . . x y
        lappend xy $x $y

        set bgClr [::tk::Darken $clr $S(darken,$L(done,$clr))]
        .c itemconfig cell_${row},$col -fill $bgClr
    }
    if {[llength $L(path,$clr)] < 2} {
        .c delete path,$clr
        return
    }
    if {[.c find withtag path,$clr] eq ""} {
        .c create line $xy -tag path,$clr -fill $clr \
            -width $S(lwidth) -capstyle round
        .c raise node
    } else {
        .c coords path,$clr $xy
    }
}
proc DoHint {clr} {
    global L S SOLUTIONS

    if {! $S(hints,canDo)} {
        MyDialog "Turn on hints on\nthe help dialog" ok {destroy .dialog}
        return
    }
        
    if {![info exists SOLUTIONS($S(stage),$S(level))]} {
        MyDialog "No hints available\nfor this level" ok {destroy .dialog}
        return
    }
    incr S(hints,used)
    set hintPath [GetHintPath $clr]
    set L(delete,$clr) $L(path,$clr)
    set L(path,$clr) {}
    ShowPath $clr
    set L(path,$clr) $hintPath
    set L(done,$clr) 1
    foreach cell $hintPath {
        lassign $cell row col
        StealCell $row $col $clr
    }
    ShowPath $clr
    CheckVictory
}
proc GetHintPath {clr} {
    global S BOARDS SOLUTIONS
    array set DIRS {w {0 -1} e {0 1} n {-1 0} s {1 0}}

    set me "$S(stage),$S(level)"
    set idx [lsearch $BOARDS($me) $clr]
    lassign [lrange $BOARDS($me) $idx+1 $idx+4] row0 col0 row1 col1
    set steps [dict get $SOLUTIONS($me) $clr]

    # The saved path may be from either end, build up both
    set path0 [list [list $row0 $col0]]
    set path1 [list [list $row1 $col1]]
    set lastStep ""

    # steps is: e3nws5  and count could be 2 digits, hence regsub
    foreach step [regsub -all {[nsew]} $steps " \& "] {
        set cnt 1
        if {[string is integer $step]} {
            set cnt [expr {$step - 1}]
            set step $lastStep
        }
        while {[incr cnt -1] >= 0} {
            lassign $DIRS($step) drow dcol
            set row [expr {[lindex $path0 end 0] + $drow}]
            set col [expr {[lindex $path0 end 1] + $dcol}]
            lappend path0 [list $row $col]
            set row [expr {[lindex $path1 end 0] + $drow}]
            set col [expr {[lindex $path1 end 1] + $dcol}]
            lappend path1 [list $row $col]
        }
        set lastStep $step
    }
    # Determine which path is correct
    if {[lindex $path0 end] eq [list $row1 $col1]} {
        return $path0
    }
    return $path1
}
# Determine size of a cell which determines the size of everything else
proc ComputeSizes {N} {
    global S

    set w [expr {max([winfo width .c], [winfo reqwidth .c])}]
    set w [expr {$w - 2*$S(margin)}]
    set S(sz) [expr {$w/$N}]
    set S(sz2) [expr {$S(sz)/2}]
    set S(radius) [expr {$S(sz) * $S(radius,factor)}]
    set S(lwidth) [expr {$S(sz) * $S(lwidth,factor)}]
}
proc CheckVictory {} {
    global L B

    foreach arr [array names L path,*] {
        if {[llength $L($arr)] < 2} return
        lassign $arr . clr
        lassign [lindex $L($arr) 0] row col
        if {[lindex $B($row,$col) 0] ne "node"} return
        lassign [lindex $L($arr) end] row col
        if {[lindex $B($row,$col) 0] ne "node"} return
    }

    # Every cell must be used
    for {set row 0} {$row < $B(N)} {incr row} {
        for {set col 0} {$col < $B(N)} {incr col} {
            if {$B($row,$col) eq ""} {
                AlmostVictory
                return
            }
        }
    }
    Victory
    return 1
}
proc AlmostVictory {} {
    if {$::B(almost)} return
    set ::B(almost) 1
    MyDialog "Almost done!\nNow fill all the cells" "skip ahead" {PlayAgain 1} \
        "keep playing" {destroy .dialog}
}
proc Victory {} {
    global S SOLUTIONS
    
    .c itemconfig solvedStar -state ""
    set me "$S(stage),$S(level)"
    if {$S(hints,used) > 0} {
        set hintText "\nwith a hint"
    } else {
        set hintText ""
        if {! [HasBeenSolved $S(stage) $S(level)]} {
            #set SOLUTIONS($me) [CompactPaths]
            set S(solved) [lsort -dictionary -unique [concat $me $S(solved)]]
            WriteRC
        }
    }
    if {$me eq [lindex [lsort -dictionary [array names ::BOARDS]] end]} {
        MyDialog "You finished the\nlast level!$hintText" \
            "restart" {PlayAgain 1} "play again" {PlayAgain 0}
    } else {
        MyDialog "Finished!$hintText" "next level" {PlayAgain 1} \
            "play again" {PlayAgain 0}
    }
}
proc CompactPaths {} {
    array set DIRS {1,0 s -1,0 n 0,1 e 0,-1 w}
    set allPaths {}
    foreach arr [array names ::L path,*] {
        set thisPath [lindex [split $arr ","] 1]
        append thisPath " "
        set row0 -1
        foreach cell $::L($arr) {
            lassign $cell row1 col1
            if {$row0 > -1} {
                set drow [expr {$row1 - $row0}]
                set dcol [expr {$col1 - $col0}]
                append thisPath $DIRS($drow,$dcol)
            }
            lassign [list $row1 $col1] row0 col0
        }
        lappend allPaths $thisPath
    }
    return [join $allPaths " "]
}
proc MakeStar {x y delta} {
    set pi [expr {acos(-1)}]

    # Compute distance to inner corner
    #set x1 [expr {$delta * cos(54 * $pi/180)}]  ;# Unit vector to inner point
    set y1 [expr {sin(54 * $pi/180)}]
    set y2 [expr {$delta * sin(18 * $pi/180)}]  ;# Y value to match
    set delta2 [expr {$y2 / $y1}]

    # Now get all coordinates of the 5 outer and 5 inner points
    for {set i 0} {$i < 10} {incr i} {
        set d [expr {($i % 2) == 0 ? $delta : $delta2}]
        set theta [expr {(90 + 36 * $i) * $pi / 180}]
        set x1 [expr {$x + $d * cos($theta)}]
        set y1 [expr {$y - $d * sin($theta)}]

        lappend coords $x1 $y1
    }
    return $coords
 }

proc ShowPickPuzzlePage {} {
    set ::S(state) pick
    FadeOut all
    DrawPickPuzzlePage
    FadeIn all
}
proc PlayChosenPuzzle {level} {
    set ::S(level) $level
    PlayAgain 0
}
proc PlayAgain {delta} {
    global S BOARDS
    destroy .dialog
    FadeOut all
    set S(state) play
    set S(hints,used) 0

    set S(level) [expr {$S(level)+$delta}]
    if {! [info exists BOARDS($S(stage),$S(level))]} {
        incr S(stage) $delta
        set S(level) [expr {$delta > 0 ? 1 : 30}]
    }
    if {! [info exists BOARDS($S(stage),$S(level))]} {
        set S(stage) 1
        set S(level) 1
    }
    WriteRC
    DrawBoard $S(stage) $S(level)
    FadeIn all
}
proc MyDialog {txt args} {
    set C .dialog
    destroy $C
    
    set w [expr {50 + max(150,[MeasureText $txt])}]
    set x [expr {$w/2}]
    set bg purple4
    canvas $C -width $w -height 170 -bd 0 -highlightthickness 0 \
        -bg $::CLR(dialog,bg)
    place $C -anchor c -relx .5 -rely .5

    $C delete all
    $C create text $x 20 -text $txt -fill $::CLR(dialog,txt) \
        -font myDialogFont -anchor n

    foreach {txt command} $args {
        set y [expr {[lindex [$C bbox all] 3] + 15}]
        set id [$C create text $x $y -text $txt -fill $::CLR(dialog,txt) \
                    -font myDialogFont -anchor n]
        lassign [$C bbox $id] . y0 . y1
        set id1 [$C create rect \
                     25 [expr {$y0-5}] [expr {$w-25}] [expr {$y1+5}] \
                     -fill $::CLR(dialog,button) -outline $::CLR(dialog,fg) \
                     -width 2]
        $C raise $id
        CanvasButtonBinding $C $id $id1 $::CLR(dialog,highlight) $command
    }
    lassign [$C bbox all] . . x1 y1
    incr y1 20
    $C config -height $y1

    set id [$C create rect 0 0 $w $y1 -fill $::CLR(dialog,bg) \
                -outline $::CLR(dialog,fg) -width 5]
    $C lower $id
    update idletasks
    grab $C
}
proc MeasureText {txt} {
    set longest 0
    foreach line [split $txt \n] {
        set longest [expr {max($longest,[font measure myDialogFont $line])}]
    }
    return $longest
}


proc Box {x y r} {
    return [list [expr {$x-$r}] [expr {$y-$r}] [expr {$x+$r}] [expr {$y+$r}]]
}
proc Cell2XY {row col} {
    global B S

    set x [expr {$B(xy0) + $col * $S(sz) + $S(sz2)}]
    set y [expr {$B(xy0) + $row * $S(sz) + $S(sz2)}]
    set box [Box $x $y $S(sz2)]
    set oval [Box $x $y $S(radius)]
    return [list $box $oval $x $y]
}
proc Test_Cell2XY {} {
    set x0 0
    for {set i 0} {$i < 7} {incr i} {
        lassign [Cell2XY $i $i] box oval x y
        set delta [expr {$x - $x0}]
        puts "$i : $x   $delta"
        set x0 $x
    }
}
proc XY2Cell {cx cy} {
    global B S
    set row [expr {int(($cx - $B(xy0)) / $S(sz))}]
    set col [expr {int(($cy - $B(xy0)) / $S(sz))}]
    return [list $row $col]
}
proc Recenter {W h w} {
    set h [expr {$h/2}]
    set w [expr {$w/2}]
    $W config -scrollregion [list -$w -$h $w $h]
}
proc FadeIn {tag} {
    FadeOut $tag fadein
}
proc FadeOut {tag {fadein fadeout}} {
    set ids [expr {$tag eq "all" ? [.c find all] : [.c find withtag $tag]}]
    set FADING [dict create]
    foreach id $ids {
        if {[.c itemcget $id -tag] eq "border"} continue
        set type [.c type $id]
        if {$type eq "image"} continue
        set gradient [Gradient [.c itemcget $id -fill] black]
        if {$fadein eq "fadein"} { set gradient [lreverse $gradient] }
        set fading [list fill $gradient]
        if {$type in {"oval" "rectangle" "polygon"}} {
            set gradient [Gradient [.c itemcget $id -outline] black]
            if {$fadein eq "fadein"} { set gradient [lreverse $gradient] }
            lappend fading outline $gradient
        }
        dict set FADING $id $fading
    }
    DoFade $FADING 0
    MyWait
}
proc DoFade {FADING step} {
    lassign $::S(fade,params) steps delay
    
    foreach id [dict keys $FADING] {
        foreach {what gradient} [dict get $FADING $id] {
            set clr [lindex $gradient $step]
            .c itemconfig $id -$what $clr
        }
    }
    incr step
    if {$step < $steps} {
        after $delay [list DoFade $FADING $step]
    } else {
        set ::S(wait) 1
    }
}
proc MyWait {} {
    destroy .grab
    label .grab ; place .grab -x -100 -y -100 ; grab .grab
    tkwait variable ::S(wait)
    destroy .grab
}
proc Gradient {fromColor toColor} {
    if {[info exists ::MEM($fromColor,$toColor)]} {
        return $::MEM($fromColor,$toColor)
    }
    set steps [lindex $::S(fade,params) 0]
    lassign [winfo rgb . $fromColor] r1 g1 b1
    lassign [winfo rgb . $toColor] r2 g2 b2
    
    set steps [expr {$steps <= 1 ? 1 : double($steps - 1)}]
    set gradient {}
    for {set step 0} {$step <= $steps} {incr step} {
        set r [expr {int(($r2 - $r1) * $step / $steps + $r1) * 255 / 65535}]
        set g [expr {int(($g2 - $g1) * $step / $steps + $g1) * 255 / 65535}]
        set b [expr {int(($b2 - $b1) * $step / $steps + $b1) * 255 / 65535}]
        lappend gradient [format "#%.2x%.2x%.2x" $r $g $b]
    }

    set ::MEM($fromColor,$toColor) $gradient
    return $gradient
}
proc CanvasButtonBinding {C text_tag box_tag highlight cmd} {
    global _CB
    set who "$C,$text_tag"
    set oldFill [expr {$box_tag ne "" ? [$C itemcget $box_tag -fill] : ""}]
    set oldOutline [expr {$box_tag ne "" ? [$C itemcget $box_tag -outline] : ""}]
    set _CB($who,data) [list "" $C $box_tag $highlight $oldOutline $oldFill $cmd]
    foreach tag [list $text_tag $box_tag] {
        if {$tag eq ""} continue
        foreach action {Button-1 ButtonRelease-1 Leave Enter} {
            $C bind $tag <$action> [list _CanvasButtonBinding $who $action]
        }
    }
}
proc _CanvasButtonBinding {who what} {
    global _CB

    lassign $_CB($who,data) state C box_tag highlight oldOutline oldFill cmd
    if {$what eq "Button-1"} {
        lset _CB($who,data) 0 "in"
        if {$box_tag ne ""} {$C itemconfig $box_tag -fill $highlight -outline $highlight}
    } elseif {$what eq "ButtonRelease-1"} {
        lset _CB($who,data) 0 ""
        if {$box_tag ne ""} {$C itemconfig $box_tag -fill $oldFill -outline $highlight}
        if {$state eq "in"} {uplevel #0 $cmd}
    } elseif {$what eq "Leave"} {
        if {$state ne ""} { lset _CB($who,data) 0 "out" }
        if {$box_tag ne ""} {$C itemconfig $box_tag -fill $oldFill -outline $oldOutline}
    } elseif {$what eq "Enter"} {
        if {$state ne ""} { lset _CB($who,data) 0 "in" }
        if {$box_tag ne ""} {
            if {$state eq ""} {
                $C itemconfig $box_tag -outline $highlight
            } else {
                $C itemconfig $box_tag -fill $highlight -outline $highlight
            }
        }
    }
}
proc Help {} {
    set msg "Flow Colors\nby Keith Vetter\n\n"
    append msg "The object of Flow Colors is\n"
    append msg "lay pipes to connect all pairs\n"
    append msg "of colors. A level is solved\n"
    append msg "when all the colors are paired\n"
    append msg "and the entire board is filled.\n\n"
    append msg "Flow Colors is based on a game\n"
    append msg "by Mohammed el-Madhoun\n"
    append msg "http://moh97.us/flow\n"
    if {[llength [array names ::SOLUTIONS]] > 0} {
        MyDialog  $msg "ok" {destroy .dialog} "hints" {HelpHint}
    } else {
        MyDialog  $msg "ok" {destroy .dialog}
    }
}
proc HelpHint {} {
    set ::S(hints,canDo) 1
    set msg "Flow Colors Hints\n\n"
    append msg "You can now get a hint by\n"
    append msg "holding down the shift key\n"
    append msg "and double right click on\n"
    append msg "any node.\n"
    MyDialog  $msg "ok" {destroy .dialog}
}
proc ReadRC {} {
    if {[file exists $::S(rcFile)]} {
        uplevel #0 source [list $::S(rcFile)]
    }
    if {[info exists ::S(lastPuzzle)] && [llength $::S(lastPuzzle)] == 2} {
        lassign $::S(lastPuzzle) ::S(stage) ::S(level)
    }
}
proc WriteRC {} {
    global S SOLUTIONS
    catch { 
        set fout [open $S(rcFile) w]
        puts $fout "set ::S(lastPuzzle) {$S(stage) $S(level)}"
        puts $fout "set ::S(solved) {$S(solved)}"
        if {0} {
            puts $fout "array set SOLUTIONS {"
            foreach arr [lsort -dictionary [array names SOLUTIONS]] {
                puts $fout "   $arr {$SOLUTIONS($arr)}"
            }
            puts $fout "}"
        }
        close $fout
    }
}
################################################################
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array set SOLUTIONS {
   1,1 {blue s5w green s2 darkorange n4 cyan s3w2 red e3n5 yellow en3e}
   1,2 {blue wn3w2 green s2 darkorange ws5e5n cyan se red n3e2s yellow n2}
   1,3 {red e5s yellow w2s2 blue s3 green s3w2n2w darkorange sw2n4e3}
   1,4 {yellow e2n5w2s2 blue n3 green wn3 darkorange nwn3w2s5e2}
   1,5 {yellow s2e2n blue e2s2w4n5e green ne2s5 darkorange s3e2}
   1,6 {yellow wsw3n2ene2 blue e5s5w green nw4s darkorange ene2}
   1,7 {blue n5e2s3 green s2 darkorange s2w4n4 cyan e2n red n2w yellow s2}
   1,8 {red s3w5n yellow e2s blue s2w2nwn3e2 green e2s3 darkorange ses}
   1,9 {red n3e yellow n2 blue s4 green s2e2n5 darkorange en2w3s5e}
   1,10 {blue w4 green e4 darkorange s3e5 cyan w3 red w4nwn yellow e4}
   1,11 {red w4n3e5s yellow e3 blue se4 green se5n2 darkorange e2}
   1,12 {yellow ne4n3w2 blue ws3e3 green e3s5w4 darkorange w2n}
   1,13 {red ene2s2 yellow ne2s2e3n2wn2 blue n2e2 green wn2w2n darkorange en}
   1,14 {red n2 yellow n5e3s2ws3 blue s4e green n4e darkorange n4w}
   1,15 {blue es green ses darkorange ne cyan n2en2e2s red s3 yellow e2n5w5}
   1,16 {blue e2s5w5 green wsw darkorange s2 cyan ne2 red e2n yellow n2ene3}
   1,17 {blue e2s4w green se3n3 darkorange s2 cyan nw red w3sw yellow ws3ese}
   1,18 {red e2 yellow e2n4 blue e2 green e3s2w3s2e darkorange w5s5}
   1,19 {red w2s yellow e3 blue w3s2 green s5e5n3w darkorange s3e3}
   1,20 {yellow en blue n2e2s green s2w2n4e4s darkorange e2n5w5}
   1,21 {blue se green e4n5 darkorange s2 cyan s4w4s red en2w yellow se3}
   1,22 {red s5w5n yellow e3s2 blue en4w4 green nw darkorange sese}
   1,23 {yellow e3n blue w5s5e5 green w2 darkorange w4n3e4}
   1,24 {blue en green ese darkorange sw3n cyan s5 red e2s3ws yellow sw4n2e}
   1,25 {blue w2 green ws5 darkorange w3 cyan s3e3n2w red n4e4 yellow se}
   1,26 {red e5s5w2 yellow en blue w2sws green en3w4 darkorange ne3}
   1,27 {red ws2es yellow s4e2 blue en3w green nwn4e3s darkorange n4w}
   1,28 {yellow e4n5w4 blue e3 green s2e3 darkorange e3s2w4s2}
   1,29 {blue ne5s3 green s2wsw2n2 darkorange es3 cyan sw2 red en yellow nen2}
   1,30 {red ne5s3 yellow ws2e blue sw2n3wnw green es3 darkorange e2n2w}
   2,1 {blue w6s6e5 green sw darkorange w4s cyan e2s3 red w3n2ene4n yellow nw}
   2,2 {blue e2 green nw3 magenta w2n6e darkorange ws4e cyan sw2nwn red e3n6w4 yellow es}
   2,3 {blue w6n2 green se2 magenta e2 darkorange w2n2 brown es2 red s2e4n cyan e6s yellow wnw5}
   2,4 {red n3ene4s4 yellow nw2 blue n2e2se green e6n6w6s darkorange w2n}
   2,5 {blue se3s2 green en3 darkorange s2ese4 cyan s6e red es2 yellow e4s5w3n3}
   2,6 {blue enwn2e2sw green sw magenta se4n2 darkorange sen3e2 cyan es2 red sw6n2 yellow e2n3}
   2,7 {red e4 yellow se4n blue e2 green ne6s2w5 darkorange s4e6n3w2sw2}
   2,8 {blue w3 green w5n6e4 magenta nw3 darkorange n3e5n cyan wsw4 red e3 yellow s2}
   2,9 {blue w2 green w3n3 darkorange ne5 cyan sws4e6n2 red sw3s2e3 yellow w4n2}
   2,10 {blue n4 green en6w4s5 darkorange s5e cyan ws6 red n2e2s4 yellow n2}
   2,11 {blue ne3s2 green w2 magenta sws2 darkorange se3s cyan s2e red n4 yellow se6n6w2s3}
   2,12 {blue sw3 green n2e6s2w3 magenta n3 darkorange s3e2ne2s2 cyan s3 red ne4 yellow ne3}
   2,13 {blue e2 green sw6n2 darkorange s3 cyan ws red ses2e2nen2 yellow wsw4n2wn3e5}
   2,14 {blue en green n2w magenta n3wn2 darkorange s2 brown nw2s5e red n2w3s cyan s4w2sw2 yellow e2n2}
   2,15 {red sws4e6n6w2s yellow s4w4 blue es2es2w3n green wn2 darkorange ws}
   2,16 {red ese3n yellow e2 blue e2s green n4w6s5e darkorange wnw3n3e4sw3s}
   2,17 {blue e2se green e2se3n magenta nw3 darkorange n3w5s3e cyan w2n2e red en4 yellow wnw2n}
   2,18 {blue w2s3 green n2wn2 magenta se4n3e2 darkorange s2 cyan s2 red n2w6s4es yellow ne3}
   2,19 {blue n2 green ne2 darkorange sw3 cyan sw3s3e2ne red n5e3ne2s3 yellow n6e3}
   2,20 {red w2s5e6n6w3 yellow ese2n2 blue nw2 green w2 darkorange e2s4w4n}
   2,21 {blue wnw3 green e2s2e darkorange es2w3s2e5n6w2 cyan s3 red s4w3 yellow es}
   2,22 {blue e4n3w2s green w2s magenta n2ene4n darkorange s2w6 cyan w4s red nw3 yellow e3}
   2,23 {blue n2 green s6e4n2 darkorange ne3n cyan wsw3s3e red w2n5e3 yellow n3w2}
   2,24 {blue se2 green sw4s2w darkorange n2e6 cyan wnw2sw3n2en2e4 red w3 yellow e3s}
   2,25 {blue en3w3nw2 green s6e3 darkorange ese3s cyan se3s red nw4 yellow e3se2n2}
   2,26 {red n3w yellow e2n2wn2e3s4e blue e6n6w4 green ws4e darkorange n3}
   2,27 {red e2s5w5n2 yellow s2e2n3 blue w6n6e3 green s3 darkorange n2w2s}
   2,28 {blue e5n6w green e2s3 magenta ese2 darkorange nen cyan w3n2w2s red se2n3 yellow se3}
   2,29 {blue e2 green se2n2e darkorange w3n cyan nw3 red ne4s3 yellow nwn4e6s5w2}
   2,30 {blue es3 green e2 magenta e2s darkorange es2e2s2e3s2w6n2 cyan s2w red se4 yellow s2e2s}
   3,1 {blue es2w green s5w3nwn3e2 darkorange se cyan w3s5ese5n5 red w4s7e yellow n2e2s}
   3,2 {blue n4w4n green sw3s darkorange ene4n5 cyan e5s7w4 red s2e4s3w3sws yellow e2}
   3,3 {blue e4s3e green n4w5sws2e4s3e2s darkorange w3s2e6 cyan s2w3 red ws4e3 yellow e3}
   3,4 {blue wsw3 green n3e6s magenta nw4 darkorange e3ne2 cyan w4s2e4 red wn2e3 yellow sw7n7}
   3,5 {blue s4w2 green w6s4e darkorange e5 cyan e6nw4nenw red n2e2 yellow wn2e2n3e2ne2swse}
   3,6 {blue n2w3n2e4 green nw4nw2s magenta es3e3s darkorange n3w3 cyan w4n red e2s3e3s2e2 yellow wn5}
   3,7 {red wnenes6wn3ws3wn2wnws2esw3n2es yellow w2s blue e3s green wn2ene2sw darkorange ne4s2}
   3,8 {blue n2w4sws green n2ene5n2 magenta sw2 darkorange sw5s cyan w5s7e4n red w2n2w yellow wn2w2}
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}
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}
################################################################

ReadRC
DoDisplay
DrawBoard $S(stage) $S(level)
return

Comments


ak - 2014-04-24 19:09:21

Oh yes on the addictive. Have this on my pad. Running the pipes with the fingers is very natural. Lost quite some time on it. Having it for Tcl is really nice. Thanks, Keith.

HJG 2014-04-24 - Nice program, but I encountered some problems:

  • Tcl 8.5 complains about the image-format kpv added 'package require Img
  • when running the program the second time, it fails to load/source the savefile .flowColorsrc from a directory with spaces (as in 'C:/Dokumente und Einstellungen/...') MG added list around the dir to hopefully fix this
  • $tcl_platform(os) returns on WinXP with "Windows NT", so the default filename for linux is used MG Changed to tcl_platform(platform)
  • also: sometimes, when connecting the last pipe from A->B the level does not end. But it works when doing it B->A. I haven't found a clear testcase for this yet...

AMG: The title reminds me of this 800 State classic: [3 ]. Listen as you play.

AMG: I can use the Next Puzzle button to go from Level 3 to Level 1 of the next stage, but I can't use Previous Puzzle to go back to Level 30. Also I find it odd that the button is labeled Next/Previous Puzzle even though it advances through what are called Levels. kpv bug, now fixed