21 lines
1 KiB
Text
21 lines
1 KiB
Text
# draw_nine.ludic - where a nine-slice is cut: its corners as wide as border-image says, but never
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# more than half the box across or half of it down (each direction on its own, so a small key cap
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# keeps its round ends and has no seam), on whole pixels so the nine pieces meet exactly
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# x0 x1 x2 x3 then y0 y1 y2 y3: the columns' and the rows' edges
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export function ui_nine_cuts(x: float, y: float, w: float, h: float, dst: float) -> []float { return ui_nine_cuts_into(new []float, x, y, w, h, dst) }
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# the same into a list the caller keeps, emptied first
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function ui_nine_cuts_into(out: []float, x: float, y: float, w: float, h: float, dst: float) -> []float {
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let dx = Math.max(Math.min(dst, w / 2.0), 0.0)
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let dy = Math.max(Math.min(dst, h / 2.0), 0.0)
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List.clear(out)
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push(out, nn_px(x))
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push(out, nn_px(x + dx))
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push(out, nn_px(x + w - dx))
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push(out, nn_px(x + w))
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push(out, nn_px(y))
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push(out, nn_px(y + dy))
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push(out, nn_px(y + h - dy))
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push(out, nn_px(y + h))
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return out
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}
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function nn_px(v: float) -> float { return Math.floor(v + 0.5) }
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