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[epaint] Tessellator: handle sharp path corners better

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Switch to bevel joints instead of miter joints for > 90° corners
This commit is contained in:
Emil Ernerfeldt 2021-02-04 18:46:36 +01:00
parent 0f37b009d6
commit 0942a2aa3b
2 changed files with 31 additions and 9 deletions
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1
CHANGELOG.md
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@ -35,6 +35,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
### Fixed 🐛 ### Fixed 🐛
* It is now possible to click widgets even when FPS is very low. * It is now possible to click widgets even when FPS is very low.
* Tessellator: handle sharp path corners better (switch to bevel instead of miter joints for > 90°).
## 0.8.0 - 2021-01-17 - Grid layout & new visual style ## 0.8.0 - 2021-01-17 - Grid layout & new visual style

39
epaint/src/tessellator.rs
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@ -87,9 +87,21 @@ impl Path {
n1 = n0; n1 = n0;
} }
let v = (n0 + n1) / 2.0; let normal = (n0 + n1) / 2.0;
let normal = v / v.length_sq(); // TODO: handle VERY sharp turns better let length_sq = normal.length_sq();
self.add_point(points[i], normal); let right_angle_length_sq = 0.5;
let sharper_than_a_right_angle = length_sq < right_angle_length_sq;
if sharper_than_a_right_angle {
// cut off the sharp corner
let center_normal = normal.normalized();
let n0c = (n0 + center_normal) / 2.0;
let n1c = (n1 + center_normal) / 2.0;
self.add_point(points[i], n0c / n0c.length_sq());
self.add_point(points[i], n1c / n1c.length_sq());
} else {
// miter join
self.add_point(points[i], normal / length_sq);
}
} }
self.add_point( self.add_point(
points[n - 1], points[n - 1],
@ -115,12 +127,21 @@ impl Path {
n1 = n0; n1 = n0;
} }
// if n1 == Vec2::zero() { let normal = (n0 + n1) / 2.0;
// continue let length_sq = normal.length_sq();
// } let right_angle_length_sq = 0.5;
let v = (n0 + n1) / 2.0; let sharper_than_a_right_angle = length_sq < right_angle_length_sq;
let normal = v / v.length_sq(); // TODO: handle VERY sharp turns better if sharper_than_a_right_angle {
self.add_point(points[i], normal); // cut off the sharp corner
let center_normal = normal.normalized();
let n0c = (n0 + center_normal) / 2.0;
let n1c = (n1 + center_normal) / 2.0;
self.add_point(points[i], n0c / n0c.length_sq());
self.add_point(points[i], n1c / n1c.length_sq());
} else {
// miter join
self.add_point(points[i], normal / length_sq);
}
} }
} }
} }