29 lines
777 B
Factor
29 lines
777 B
Factor
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! Copyright (C) 2006 Slava Pestov.
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! See http://factorcode.org/license.txt for BSD license.
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IN: gadgets
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USING: kernel math namespaces opengl sequences ;
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TUPLE: grid-lines color ;
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SYMBOL: grid-dim
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: half-gap gap 2 v/n ; inline
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: grid-line-from/to ( orientation point -- from to )
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half-gap v-
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[ half-gap swap rot set-axis ] 2keep
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grid-dim get swap rot set-axis ;
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: draw-grid-lines ( gaps orientation -- )
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swap grid-positions grid get rect-dim { 1 0 } v- add
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[ grid-line-from/to gl-line ] each-with ;
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M: grid-lines draw-boundary
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origin get [
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grid-lines-color gl-color [
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grid get rect-dim half-gap v- grid-dim set
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{ 0 1 } draw-grid-lines
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{ 1 0 } draw-grid-lines
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] with-grid
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] with-translation ;
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