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Derivation comment for calculation in repeat (#5575)

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Andrew Voynov 2024-12-16 15:18:34 +03:00 committed by GitHub
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commit 7f139517b9
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1 changed files with 12 additions and 3 deletions
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15
crates/typst-layout/src/repeat.rs
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@ -33,8 +33,17 @@ pub fn layout_repeat(
let fill = region.size.x;
let width = piece.width();
// count * width + (count - 1) * gap = fill, but count is an integer so
// we need to round down and get the remainder.
// We need to fit the body N times, but the number of gaps is (N - 1):
// N * w + (N - 1) * g ≤ F
// where N - body count (count)
// w - body width (width)
// g - gap width (gap)
// F - available space to fill (fill)
//
// N * w + N * g - g ≤ F
// N * (w + g) ≤ F + g
// N ≤ (F + g) / (w + g)
// N = ⌊(F + g) / (w + g)⌋
let count = ((fill + gap) / (width + gap)).floor();
let remaining = (fill + gap) % (width + gap);
@ -52,7 +61,7 @@ pub fn layout_repeat(
if width > Abs::zero() {
for _ in 0..(count as usize).min(1000) {
frame.push_frame(Point::with_x(offset), piece.clone());
offset += piece.width() + gap;
offset += width + gap;
}
}