bherbruckandClaude Opus 5.5
b9bc75670c
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01AS5Tn3xieewUSg3uxrMVdL
30 lines
1.4 KiB
Rust
30 lines
1.4 KiB
Rust
//! Free-form profile edges: Béziers (cubic and higher) as B-spline curves and conics as rational quadratic
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//! NURBS curves (exact ellipses, parabolas and hyperbolas from sketches).
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use solvecraft_geom::{Plane, Seg2};
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use truck_modeling as mt;
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use crate::body::p3;
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/// The edge for a free-form segment between two existing vertices (None for lines and arcs).
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pub(crate) fn edge(plane: &Plane, s: &Seg2, a: &mt::Vertex, b: &mt::Vertex) -> Option<mt::Edge> {
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match *s {
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Seg2::Cubic { p1, p2, .. } => Some(mt::builder::bezier(a, b, vec![p3(plane.to_world(p1)), p3(plane.to_world(p2))])),
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Seg2::Conic { apex, w, .. } => {
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let (pa, pb, px) = (a.point(), b.point(), p3(plane.to_world(apex)));
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let ctrl = vec![
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mt::Vector4::new(pa.x, pa.y, pa.z, 1.0),
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mt::Vector4::new(px.x * w, px.y * w, px.z * w, w),
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mt::Vector4::new(pb.x, pb.y, pb.z, 1.0),
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];
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let curve = mt::NurbsCurve::new(mt::BSplineCurve::new(mt::KnotVec::bezier_knot(2), ctrl));
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Some(mt::Edge::new(a, b, mt::Curve::NurbsCurve(curve)))
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}
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Seg2::Bezier { n, ref p } => {
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let inner = p.get(1..(n as usize).clamp(1, solvecraft_geom::MAX_BEZIER_DEGREE))?;
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Some(mt::builder::bezier(a, b, inner.iter().map(|q| p3(plane.to_world(*q))).collect()))
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}
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Seg2::Line { .. } | Seg2::Arc { .. } => None,
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}
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}
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