1 changed files with 90 additions and 0 deletions
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fn draw-circle screen: (addr screen), cx: int, cy: int, radius: int, color: int { |
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var x: int |
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var y: int |
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var err: int |
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# x = -r |
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var tmp/eax: int <- copy radius |
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tmp <- negate |
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copy-to x, tmp |
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# err = 2 - 2*r |
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tmp <- copy radius |
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tmp <- shift-left 1 |
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tmp <- negate |
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tmp <- add 2 |
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copy-to err, tmp |
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# |
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var tmpx/ecx: int <- copy 0 |
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var tmpy/edx: int <- copy 0 |
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{ |
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# pixel(cx-x, cy+y) |
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tmpx <- copy cx |
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tmpx <- subtract x |
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tmpy <- copy cy |
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tmpy <- add y |
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pixel screen, tmpx, tmpy, color |
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# pixel(cx-y, cy-x) |
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tmpx <- copy cx |
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tmpx <- subtract y |
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tmpy <- copy cy |
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tmpy <- subtract x |
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pixel screen, tmpx, tmpy, color |
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# pixel(cx+x, cy-y) |
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tmpx <- copy cx |
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tmpx <- add x |
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tmpy <- copy cy |
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tmpy <- subtract y |
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pixel screen, tmpx, tmpy, color |
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# pixel(cx+y, cy+x) |
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tmpx <- copy cx |
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tmpx <- add y |
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tmpy <- copy cy |
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tmpy <- add x |
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pixel screen, tmpx, tmpy, color |
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# r = err |
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tmp <- copy err |
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copy-to radius, tmp |
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# if (r <= y) { ++y; err += (y*2 + 1); } |
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{ |
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tmpy <- copy y |
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compare radius, tmpy |
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break-if-> |
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increment y |
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tmpy <- copy y |
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tmpy <- shift-left 1 |
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tmpy <- increment |
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add-to err, tmpy |
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} |
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# if (r > x || err > y) { ++x; err += (x*2 + 1); } |
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$draw-circle:second-check: { |
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{ |
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tmpx <- copy x |
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compare radius, tmpx |
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break-if-> |
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tmpy <- copy y |
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compare err, tmpy |
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break-if-> |
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break $draw-circle:second-check |
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} |
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increment x |
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tmpx <- copy x |
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tmpx <- shift-left 1 |
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tmpx <- increment |
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add-to err, tmpx |
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} |
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# loop termination condition |
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compare x, 0 |
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loop-if-< |
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} |
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} |
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|
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fn draw-disc screen: (addr screen), cx: int, cy: int, radius: int, color: int, border-color: int { |
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var r/eax: int <- copy 0 |
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{ |
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compare r, radius |
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break-if->= |
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draw-circle screen, cx cy, r, color |
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r <- increment |
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loop |
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} |
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draw-circle screen, cx cy, r, border-color |
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} |
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