68 lines
1.5 KiB
Factor
68 lines
1.5 KiB
Factor
! From http://www.ffconsultancy.com/ocaml/maze/index.html
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USING: sequences namespaces math math.vectors opengl opengl.gl
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arrays kernel random ui ui.gadgets ui.gadgets.canvas ui.render
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math.order math.rectangles accessors ;
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IN: maze
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CONSTANT: line-width 8
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SYMBOL: visited
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: unvisited? ( cell -- ? ) first2 visited get ?nth ?nth ;
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: ?set-nth ( elt i seq -- )
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2dup bounds-check? [ set-nth ] [ 3drop ] if ;
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: visit ( cell -- ) f swap first2 visited get ?nth ?set-nth ;
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: choices ( cell -- seq )
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{ { -1 0 } { 1 0 } { 0 -1 } { 0 1 } }
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[ v+ ] with map
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[ unvisited? ] filter ;
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: random-neighbour ( cell -- newcell ) choices random ;
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: vertex ( pair -- )
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first2 [ 0.5 + line-width * ] bi@ glVertex2d ;
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: (draw-maze) ( cell -- )
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dup vertex
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glEnd
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GL_POINTS glBegin dup vertex glEnd
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GL_LINE_STRIP glBegin
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dup vertex
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dup visit
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dup random-neighbour dup [
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(draw-maze) (draw-maze)
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] [
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2drop
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glEnd
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GL_LINE_STRIP glBegin
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] if ;
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: draw-maze ( n -- )
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line-width 2 - glLineWidth
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line-width 2 - glPointSize
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1.0 1.0 1.0 1.0 glColor4d
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dup [ drop t <array> ] with map visited set
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GL_LINE_STRIP glBegin
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{ 0 0 } dup vertex (draw-maze)
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glEnd ;
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TUPLE: maze < canvas ;
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: <maze> ( -- gadget ) maze new-canvas ;
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: n ( gadget -- n ) dim>> first2 min line-width /i ;
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M: maze layout* delete-canvas-dlist ;
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M: maze draw-gadget* [ n draw-maze ] draw-canvas ;
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M: maze pref-dim* drop { 400 400 } ;
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: maze-window ( -- )
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[ <maze> "Maze" open-window ] with-ui ;
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MAIN: maze-window
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