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fix CheckCollisionPointPoly (#3750)

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Antonio Raúl 2024-01-22 10:35:55 +00:00 • committed by GitHub
parent 68c32a4184
commit ef92ced370
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1 changed files with 8 additions and 8 deletions
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16
src/rshapes.c
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@ -2196,21 +2196,21 @@ bool CheckCollisionPointTriangle(Vector2 point, Vector2 p1, Vector2 p2, Vector2
// NOTE: Based on http://jeffreythompson.org/collision-detection/poly-point.php // NOTE: Based on http://jeffreythompson.org/collision-detection/poly-point.php
bool CheckCollisionPointPoly(Vector2 point, Vector2 *points, int pointCount) bool CheckCollisionPointPoly(Vector2 point, Vector2 *points, int pointCount)
{ {
bool collision = false; bool inside = false;
if (pointCount > 2) if (pointCount > 2)
{ {
for (int i = 0; i < pointCount - 1; i++) for (int i = 0, j = pointCount - 1; i < pointCount; j = i++)
{ {
Vector2 vc = points[i]; if ((points[i].y > point.y) != (points[j].y > point.y) &&
Vector2 vn = points[i + 1]; (point.x < (points[j].x - points[i].x) * (point.y - points[i].y) / (points[j].y - points[i].y) + points[i].x))
{
if ((((vc.y >= point.y) && (vn.y < point.y)) || ((vc.y < point.y) && (vn.y >= point.y))) && inside = !inside;
(point.x < ((vn.x - vc.x)*(point.y - vc.y)/(vn.y - vc.y) + vc.x))) collision = !collision; }
} }
} }
return collision; return inside;
} }
// Check collision between two rectangles // Check collision between two rectangles