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fix(ellipse): #1532 follow-up — one transform, in the codec

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The PR's principal-axis math now lives in the codec's transform_ellipse
(8464e0a), which explode, INSERT and every other codec path share.
transform_ellipse_geometry delegates to it for the block-cache tangent,
and the entity goes back through apply_standard_entity_transform, with
MIRROR delegated to the codec's apply_mirror: the old closure reflected
only the centre and major axis, leaving mirrored arcs on the wrong side,
and the PR's version turned the normal to -Z. The mirror test now checks
the kept +Z normal and the negated parameters.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
This commit is contained in:
Hakan SevenandClaude Opus 5.5 committed 2026-09-29 23:04:23 +03:00
1 parent df8ea089d7
commit 69a2e7c73a
2 files changed
+43 -127
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src/entities/ellipse.rs
+14 -55
View File
@@ -354,58 +354,14 @@ fn apply_grip(ell: &mut Ellipse, grip_id: usize, apply: GripApply) {
}
fn apply_transform(ell: &mut Ellipse, t: &EntityTransform) {
use codec::types::{Transform, Vector3};
let transform = match t {
EntityTransform::Translate(d) => {
ell.center = ell.center + Vector3::new(d.x, d.y, d.z);
return;
}
EntityTransform::Rotate { center, axis, angle_rad } => {
let axis_norm = Vector3::new(axis.x, axis.y, axis.z);
let axis_len = axis_norm.length();
let axis_v = if axis_len > 1e-12 { axis_norm / axis_len } else { Vector3::UNIT_Z };
Transform::from_translation(Vector3::new(-center.x, -center.y, -center.z))
.then(&Transform::from_rotation(axis_v, *angle_rad))
.then(&Transform::from_translation(Vector3::new(center.x, center.y, center.z)))
}
EntityTransform::Scale { center, factor } => {
let s = *factor;
Transform::from_scaling_with_origin(
Vector3::new(s, s, s),
Vector3::new(center.x, center.y, center.z),
)
}
EntityTransform::Mirror { p1, p2, working_normal } => {
crate::scene::view::transform::reflection_about_working_line(
*p1,
*p2,
*working_normal,
)
}
EntityTransform::Affine(tr) => tr.clone(),
};
if let Some((c, m, n, ratio, s, e)) = crate::scene::view::transform::transform_ellipse_geometry(
ell.center,
ell.major_axis,
ell.normal,
ell.minor_axis_ratio,
ell.start_parameter,
ell.end_parameter,
&transform,
) {
ell.center = c;
ell.major_axis = m;
ell.normal = n;
ell.minor_axis_ratio = ratio;
ell.start_parameter = s;
let is_full = (e - s - std::f64::consts::TAU).abs() < 1e-9;
ell.end_parameter = if is_full {
std::f64::consts::TAU
} else {
e.rem_euclid(std::f64::consts::TAU)
};
}
// The codec maps the whole ellipse — ratio, principal axes and arc
// parameters — under rotate, scale, affine and mirror alike.
crate::scene::view::transform::apply_standard_entity_transform(ell, t, |entity, p1, p2| {
codec::Entity::apply_mirror(
entity,
&crate::scene::view::transform::reflection_about_xy_line(p1, p2),
);
});
}
impl RenderConvertible for Ellipse {
@@ -581,9 +537,12 @@ mod grip_tests {
};
apply_transform(&mut e, &mirror);
// Major axis should be reflected to (-10, 0, 0)
// Major axis reflected to (-10, 0, 0); MIRROR keeps the normal facing
// the mirrored plane and negates the parameters instead.
assert!((e.major_axis.x - (-10.0)).abs() < 1e-9);
// Normal should flip to -Z to preserve counter-clockwise traversal
assert!(e.normal.z < 0.0);
assert!((e.normal.z - 1.0).abs() < 1e-9);
let (s, end) = (e.start_parameter, e.end_parameter);
assert!((s - (std::f64::consts::TAU - 1.5)).abs() < 1e-9, "{s}");
assert!((end - s - 1.4).abs() < 1e-9, "{end}");
}
}
src/scene/view/transform.rs
+29 -72
View File
@@ -120,12 +120,13 @@ pub fn reflect_xy_point(x: &mut f64, y: &mut f64, p1: DVec3, p2: DVec3) {
*y = p1.y as f64 + my;
}
/// Fully transforms ellipse / elliptical arc geometry under any 3D affine transform
/// (including negative scales, reflections, negative rotations, non-uniform scales, and translation).
/// An ellipse / elliptical arc's image under any affine transform, through the
/// codec's `transform_ellipse` so the block-cache fast path and the entity
/// agree with every other path (explode, insert) by construction.
///
/// Returns `(new_center, new_major_axis, new_normal, new_minor_axis_ratio, new_start_param, new_end_param)`
/// where `new_major_axis` is guaranteed to be orthogonal to `new_normal`, its length is >= semi-minor axis length,
/// and `new_minor_axis_ratio <= 1.0`.
/// Returns `(center, major_axis, normal, minor_axis_ratio, start_param,
/// end_param)`; the major axis is the longer one and a reflection flips the
/// normal.
pub fn transform_ellipse_geometry(
center: Vector3,
major_axis: Vector3,
@@ -135,76 +136,32 @@ pub fn transform_ellipse_geometry(
end_param: f64,
transform: &Transform,
) -> Option<(Vector3, Vector3, Vector3, f64, f64, f64)> {
let norm_len = normal.length();
if norm_len <= 1e-12 || !norm_len.is_finite() {
use codec::Entity;
if normal.length() <= 1e-12 || major_axis.length() <= 1e-12 {
return None;
}
let norm = normal / norm_len;
let m = major_axis;
let m_len = m.length();
if m_len <= 1e-12 || !m_len.is_finite() {
return None;
}
let ratio = minor_axis_ratio.clamp(1e-12, 1.0);
// V = (N x M) * ratio
let v = norm.cross(&m) * ratio;
let c_prime = transform.apply(center);
let m0 = transform.apply_rotation(m);
let v0 = transform.apply_rotation(v);
let m0_len_sq = m0.length_squared();
let v0_len_sq = v0.length_squared();
if m0_len_sq <= 1e-24 || v0_len_sq <= 1e-24 || !m0_len_sq.is_finite() || !v0_len_sq.is_finite() {
return None;
}
// Extremum angle theta to find the principal axes of the transformed ellipse
let dot = m0.dot(&v0);
let diff = m0_len_sq - v0_len_sq;
let theta = 0.5 * (2.0 * dot).atan2(diff);
let (sin_t, cos_t) = theta.sin_cos();
let m_new = m0 * cos_t + v0 * sin_t;
let v_new = m0 * (-sin_t) + v0 * cos_t;
let a = m_new.length();
let b = v_new.length();
if a <= 1e-12 || !a.is_finite() {
return None;
}
let cross = m_new.cross(&v_new);
let cross_len = cross.length();
if cross_len <= 1e-12 || !cross_len.is_finite() {
return None;
}
let n_new = cross / cross_len;
let new_ratio = (b / a).clamp(1e-12, 1.0);
// Sweep and parameters
use std::f64::consts::TAU;
let raw = end_param - start_param;
let is_full = (raw - TAU).abs() < 1e-9
|| (raw.abs() >= TAU - 1e-9)
|| (raw.rem_euclid(TAU).abs() < 1e-9 && raw.abs() > 1e-9);
let (new_start, new_end) = if is_full {
(0.0, TAU)
} else {
let sweep = if raw <= 0.0 {
let s = raw.rem_euclid(TAU);
if s <= 1e-9 { TAU } else { s }
} else if raw > TAU {
TAU
} else {
raw
};
let s = (start_param - theta).rem_euclid(TAU);
(s, s + sweep)
let mut ellipse = codec::entities::Ellipse {
center,
major_axis,
normal,
minor_axis_ratio,
start_parameter: start_param,
end_parameter: end_param,
..Default::default()
};
Some((c_prime, m_new, n_new, new_ratio, new_start, new_end))
ellipse.apply_transform(transform);
let values = [ellipse.center, ellipse.major_axis, ellipse.normal];
if values.iter().any(|v| !(v.x.is_finite() && v.y.is_finite() && v.z.is_finite())) {
return None;
}
Some((
ellipse.center,
ellipse.major_axis,
ellipse.normal,
ellipse.minor_axis_ratio,
ellipse.start_parameter,
ellipse.end_parameter,
))
}
/// DXF arbitrary-axis algorithm — returns the OCS X and Y basis vectors in WCS