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Support arcs in sketches

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This commit is contained in:
Hanno Braun 2025-04-17 14:49:25 +02:00
parent bcc95c411d
commit 5c50d9636e
1 changed files with 35 additions and 9 deletions
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44
experiments/2025-03-18/src/geometry/sketch.rs
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@ -1,6 +1,6 @@
use std::collections::{BTreeMap, BTreeSet};
use fj_math::{Point, Scalar};
use fj_math::{Circle, Point, Scalar};
use itertools::Itertools;
use crate::{
@ -48,15 +48,41 @@ impl Sketch {
.iter()
.map(|([segment, next_segment], is_internal)| {
let curve = match segment.segment {
SketchSegment::Arc { radius, .. } => {
let _ = radius;
SketchSegment::Arc { start, radius } => {
let end = next_segment.segment.start();
// We are creating a line here, temporarily, while
// support for arcs is being implemented.
Handle::new(Curve::line_from_vertices([
&segment.start,
&next_segment.start,
]))
let start_to_end = end - start;
let midpoint = start + start_to_end * 0.5;
let midpoint_towards_center =
start_to_end.to_perpendicular().normalize()
* radius.sign().to_scalar();
let distance_from_midpoint_to_center = {
let d = start_to_end.magnitude() / 2.;
(radius * radius - d * d).sqrt()
};
let center = midpoint
+ midpoint_towards_center
* distance_from_midpoint_to_center;
// This only works if `surface` is a plane, which
// checks out for now.
let circle = {
let a = start;
let b = center + (a - center).to_perpendicular();
let [center, a, b] = [center, a, b].map(|point| {
surface.geometry.point_from_local(point)
});
Circle::new(center, a - center, b - center)
};
Handle::new(Curve {
geometry: Box::new(circle),
})
}
SketchSegment::Line { .. } => {
Handle::new(Curve::line_from_vertices([