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fix: Misalignment of the hittest area of PolygonHitbox #2930

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merged 6 commits into from
Dec 17, 2023
Merged

fix: Misalignment of the hittest area of PolygonHitbox #2930

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f7a8145
fix calculation for point hittest of PolygonComponent
organic-nailer Dec 17, 2023
5171749
Merge branch 'main' of https://github.com/flame-engine/flame
organic-nailer Dec 17, 2023
f662016
add test
organic-nailer Dec 17, 2023
c2388dd
fix word
organic-nailer Dec 17, 2023
257dc38
fix test and format
organic-nailer Dec 17, 2023
da02f2b
Merge branch 'main' into main
spydon Dec 17, 2023
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5 changes: 2 additions & 3 deletions packages/flame/lib/src/geometry/polygon_component.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -231,9 +231,8 @@ class PolygonComponent extends ShapeComponent {
}
for (var i = 0; i < _vertices.length; i++) {
final edge = getEdge(i, vertices: vertices);
final isOutside = (edge.to.x - edge.from.x) *
(point.y - edge.from.y + _topLeft.y) -
(point.x - edge.from.x + _topLeft.x) * (edge.to.y - edge.from.y) >
final isOutside = (edge.to.x - edge.from.x) * (point.y - edge.from.y) -
(point.x - edge.from.x) * (edge.to.y - edge.from.y) >
0;
if (isOutside) {
return false;
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13 changes: 13 additions & 0 deletions packages/flame/test/components/shape_component_test.dart
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Expand Up @@ -43,6 +43,19 @@ void main() {
);
});

test('polygon contains point in local', () {
final polygon = PolygonComponent(
[
Vector2(0.5, 0.5),
Vector2(0.5, 1.5),
Vector2(1.5, 1.5),
Vector2(1.5, 0.5),
],
);
expect(polygon.containsLocalPoint(Vector2(0.25, 0.25)), isFalse);
expect(polygon.containsLocalPoint(Vector2(0.75, 0.75)), isTrue);
});

test('rotated circle does not contain point', () {
final component = CircleComponent(
radius: 1.0,
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