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Brandon ThomasandClaude Opus 5.5
bfee80a22c
Engine-first Cargo workspace for DrawCraft (clean-room Illustrator): - geom: anchor-based path model, shapes, hit testing, snapping - color: colours, paints, gradients, swatches, blend modes, harmonies - doc: persistent Arc document tree, appearance stacks, text model, selection - render: vello_cpu renderer (appearance, gradients, clip groups, blend modes) - text: font DB, harfrust shaping, point/area/path layout - pathops: curve booleans (linesweeper), Pathfinder, offset, simplify - svg: import (usvg) and export - tools: selection/direct/pen/shape tools emitting commands - engine: Session, history with interactions, ~110 commands Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
47 lines
1.3 KiB
Rust
47 lines
1.3 KiB
Rust
//! Snapping math shared by tools and smart guides.
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use kurbo::Point;
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/// Snap a value to a grid with the given spacing and origin.
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pub fn snap_to_grid(v: f64, spacing: f64, origin: f64) -> f64 {
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if spacing <= 0.0 {
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return v;
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}
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((v - origin) / spacing).round() * spacing + origin
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}
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pub fn snap_point_to_grid(p: Point, spacing: f64) -> Point {
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Point::new(snap_to_grid(p.x, spacing, 0.0), snap_to_grid(p.y, spacing, 0.0))
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}
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/// A candidate alignment line for smart guides.
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#[derive(Clone, Copy, Debug, PartialEq)]
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pub enum Axis {
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X,
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Y,
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}
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/// Find the closest target within `tol` to `v`. Returns (target, delta).
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pub fn closest(v: f64, targets: impl IntoIterator<Item = f64>, tol: f64) -> Option<(f64, f64)> {
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targets.into_iter().map(|t| (t, t - v)).filter(|(_, d)| d.abs() <= tol).min_by(|a, b| a.1.abs().total_cmp(&b.1.abs()))
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn grid() {
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assert_eq!(snap_to_grid(13.0, 10.0, 0.0), 10.0);
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assert_eq!(snap_to_grid(16.0, 10.0, 0.0), 20.0);
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assert_eq!(snap_to_grid(16.0, 10.0, 3.0), 13.0);
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assert_eq!(snap_to_grid(16.0, 0.0, 0.0), 16.0);
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}
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#[test]
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fn closest_target() {
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assert_eq!(closest(10.0, [0.0, 11.0, 9.5], 2.0), Some((9.5, -0.5)));
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assert_eq!(closest(10.0, [0.0, 20.0], 2.0), None);
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}
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}
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