29 lines
710 B
Forth
29 lines
710 B
Forth
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fn draw-box screen: (addr screen), x1: int, y1: int, x2: int, y2: int, color: int {
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draw-horizontal-line screen, x1, x2, y1, color
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draw-vertical-line screen, x1, y1, y2, color
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draw-horizontal-line screen, x1, x2, y2, color
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draw-vertical-line screen, x2, y1, y2, color
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}
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fn draw-horizontal-line screen: (addr screen), x1: int, x2: int, y: int, color: int {
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var x/eax: int <- copy x1
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{
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compare x, x2
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break-if->=
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pixel screen, x, y, color
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x <- increment
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loop
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}
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}
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fn draw-vertical-line screen: (addr screen), x: int, y1: int, y2: int, color: int {
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var y/eax: int <- copy y1
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{
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compare y, y2
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break-if->=
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pixel screen, x, y, color
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y <- increment
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loop
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}
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}
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