Use exact kernel curves for PRESSPULL area containment

tests/presspull_curved_boundary.rs

@@ -0,0 +1,43 @@
+use acadrust::{entities::Circle, types::Vector3, EntityType};
+use glam::DVec3;
+use OpenCADStudio::command::WorkingPlane;
+use OpenCADStudio::scene::{model::presspull_model, Scene};
+
+#[test]
+fn area_picks_follow_exact_curves_and_keep_holes() {
+    let mut scene = Scene::new();
+    for radius in [1000.0, 500.0] {
+        scene
+            .document
+            .add_entity(EntityType::Circle(Circle::from_center_radius(
+                Vector3::new(0.0, 0.0, 0.0),
+                radius,
+            )))
+            .unwrap();
+    }
+    // Halfway between display vertices, these points lie beyond the chords.
+    let angle = std::f64::consts::PI / 48.0;
+    for (radius, expected_loops) in [(999.0, 2), (499.0, 1)] {
+        let point = DVec3::new(radius * angle.cos(), radius * angle.sin(), 0.0);
+        let target =
+            presspull_model::resolve_target(&scene, None, point, WorkingPlane::default(), false)
+                .expect("point inside the exact circular boundary");
+        let presspull_model::PresspullTargetKind::Profile { entity, .. } = target.kind else {
+            panic!("expected a bounded profile");
+        };
+        let (_, loops, closed) = presspull_model::profile_geometry(&entity).unwrap();
+        assert!(closed);
+        assert_eq!(loops.len(), expected_loops);
+        assert!(loops
+            .iter()
+            .flatten()
+            .all(|curve| !matches!(curve, cadkernel::geom2d::Curve::Line(_))));
+        let body = presspull_model::extrusion_body(&entity, [0.0, 0.0, 10.0]).unwrap();
+        assert!(body.validate().is_empty());
+    }
+    let outside = DVec3::new(1001.0 * angle.cos(), 1001.0 * angle.sin(), 0.0);
+    assert!(
+        presspull_model::resolve_target(&scene, None, outside, WorkingPlane::default(), false,)
+            .is_err()
+    );
+}