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fix(properties): measure bulged polylines

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Merge PR #808 and use kernel area, length, and centroid measurements.
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Hakan Seven committed 2026-08-18 19:50:08 +03:00
2 parents 3a53a110cc c17c25fef1
commit afd4c96a78
3 files changed
+16 -28
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src/entities/lwpolyline.rs
+14 -26
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@@ -1053,32 +1053,20 @@ impl crate::entities::traits::MassPropsCalc for acadrust::entities::LwPolyline {
cy: 0.0,
};
}
// Shoelace area + perimeter
let mut area_sum = 0.0f64;
let mut perimeter = 0.0f64;
let mut cx_sum = 0.0f64;
let mut cy_sum = 0.0f64;
let n_segs = if p.is_closed { n } else { n - 1 };
for idx in 0..n_segs {
let v0 = &p.vertices[idx];
let v1 = &p.vertices[(idx + 1) % n];
let x0 = v0.location.x;
let y0 = v0.location.y;
let x1 = v1.location.x;
let y1 = v1.location.y;
area_sum += x0 * y1 - x1 * y0;
perimeter += ((x1 - x0).powi(2) + (y1 - y0).powi(2)).sqrt();
cx_sum += (x0 + x1) * (x0 * y1 - x1 * y0);
cy_sum += (y0 + y1) * (x0 * y1 - x1 * y0);
}
let area = (area_sum / 2.0).abs();
let (cx, cy) = if area > 1e-12 {
(cx_sum / (6.0 * area), cy_sum / (6.0 * area))
} else {
let sx: f64 = p.vertices.iter().map(|v| v.location.x).sum::<f64>() / n as f64;
let sy: f64 = p.vertices.iter().map(|v| v.location.y).sum::<f64>() / n as f64;
(sx, sy)
};
// Kernel measurement includes bulges and closes open curves only for area.
let curve = crate::entities::curve::lwpolyline_curve(p)
.expect("an LwPolyline with at least two vertices has a planar curve");
let area = curve.curve.enclosed_area().abs();
let perimeter = curve.length();
let (cx, cy) = curve
.curve
.enclosed_centroid()
.map(|point| (point[0], point[1]))
.unwrap_or_else(|| {
let x = p.vertices.iter().map(|v| v.location.x).sum::<f64>() / n as f64;
let y = p.vertices.iter().map(|v| v.location.y).sum::<f64>() / n as f64;
(x, y)
});
crate::entities::traits::MassProps {
area,
perimeter,