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feat(polyline): apply the full width to each side of the centreline

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Draw the polyline width bands with the stored width offset to each side
of the centreline rather than half of it.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Hakan Seven 2026-07-08 15:56:56 +03:00
commit 9b45f0588d
2 changed files with 9 additions and 6 deletions
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8
src/entities/lwpolyline.rs
View file

@ -635,7 +635,9 @@ impl crate::entities::traits::Transformable for LwPolyline {
/// UTM-scale coordinates — building them in absolute f32 collapsed the band into
/// a string of squares far from the origin.
pub(crate) fn wide_fills(pl: &acadrust::entities::LwPolyline) -> ([f64; 2], Vec<Vec<[f32; 2]>>) {
let hw_const = (pl.constant_width / 2.0) as f32;
// The stored width is applied to EACH side of the centreline (not halved),
// so `polyline_segment_fill`'s ±offset spans the full width on either side.
let hw_const = pl.constant_width as f32;
let verts = &pl.vertices;
let n = verts.len();
if n < 2 {
@ -648,12 +650,12 @@ pub(crate) fn wide_fills(pl: &acadrust::entities::LwPolyline) -> ([f64; 2], Vec<
let v0 = &verts[i];
let v1 = &verts[(i + 1) % n];
let hw0 = if v0.start_width > 1e-9 {
v0.start_width as f32 / 2.0
v0.start_width as f32
} else {
hw_const
};
let hw1 = if v0.end_width > 1e-9 {
v0.end_width as f32 / 2.0
v0.end_width as f32
} else {
hw_const
};

7
src/entities/polyline.rs
View file

@ -746,7 +746,8 @@ impl Transformable for Polyline3D {
/// relative to (the first vertex). See `lwpolyline::wide_fills` — offsets are
/// f32 from `origin` so the band stays precise at UTM-scale coordinates.
pub(crate) fn wide_fills(pl: &acadrust::entities::Polyline2D) -> ([f64; 2], Vec<Vec<[f32; 2]>>) {
let hw_default = (pl.start_width.max(pl.end_width) / 2.0) as f32;
// Width is applied full to each side of the centreline (not halved).
let hw_default = pl.start_width.max(pl.end_width) as f32;
let verts = &pl.vertices;
let n = verts.len();
if n < 2 {
@ -759,12 +760,12 @@ pub(crate) fn wide_fills(pl: &acadrust::entities::Polyline2D) -> ([f64; 2], Vec<
let v0 = &verts[i];
let v1 = &verts[(i + 1) % n];
let hw0 = if v0.start_width > 1e-9 {
v0.start_width as f32 / 2.0
v0.start_width as f32
} else {
hw_default
};
let hw1 = if v0.end_width > 1e-9 {
v0.end_width as f32 / 2.0
v0.end_width as f32
} else {
hw_default
};