43 lines
979 B
Factor
43 lines
979 B
Factor
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USING: kernel arrays math.vectors ;
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IN: math.geometry.rect
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TUPLE: rect { loc initial: { 0 0 } } { dim initial: { 0 0 } } ;
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: <zero-rect> ( -- rect ) rect new ;
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C: <rect> rect
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M: array rect-loc ;
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M: array rect-dim drop { 0 0 } ;
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: rect-bounds ( rect -- loc dim ) dup rect-loc swap rect-dim ;
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: rect-extent ( rect -- loc ext ) rect-bounds over v+ ;
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: 2rect-extent ( rect rect -- loc1 loc2 ext1 ext2 )
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[ rect-extent ] bi@ swapd ;
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: <extent-rect> ( loc ext -- rect ) over [v-] <rect> ;
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: offset-rect ( rect loc -- newrect )
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over rect-loc v+ swap rect-dim <rect> ;
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: (rect-intersect) ( rect rect -- array array )
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2rect-extent vmin >r vmax r> ;
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: rect-intersect ( rect1 rect2 -- newrect )
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(rect-intersect) <extent-rect> ;
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: intersects? ( rect/point rect -- ? )
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(rect-intersect) [v-] { 0 0 } = ;
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: (rect-union) ( rect rect -- array array )
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2rect-extent vmax >r vmin r> ;
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: rect-union ( rect1 rect2 -- newrect )
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(rect-union) <extent-rect> ;
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