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REVIEWED: CheckCollisionLines(), formating and follow raylib conventions

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Ray
2026-02-06 10:55:42 +01:00
parent 3881d2aac2
commit 4f76b896d5
1 changed files with 21 additions and 17 deletions
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20
src/rshapes.c
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@ -2363,9 +2363,11 @@ bool CheckCollisionCircleRec(Vector2 center, float radius, Rectangle rec)
} }
// Check the collision between two lines defined by two points each, returns collision point by reference // Check the collision between two lines defined by two points each, returns collision point by reference
// REF: https://en.wikipedia.org/wiki/Line–line_intersection#Given_two_points_on_each_line_segment
bool CheckCollisionLines(Vector2 startPos1, Vector2 endPos1, Vector2 startPos2, Vector2 endPos2, Vector2 *collisionPoint) bool CheckCollisionLines(Vector2 startPos1, Vector2 endPos1, Vector2 startPos2, Vector2 endPos2, Vector2 *collisionPoint)
{ {
// According to https://en.wikipedia.org/wiki/Line–line_intersection#Given_two_points_on_each_line_segment bool collision = false;
float rx = endPos1.x - startPos1.x; float rx = endPos1.x - startPos1.x;
float ry = endPos1.y - startPos1.y; float ry = endPos1.y - startPos1.y;
float sx = endPos2.x - startPos2.x; float sx = endPos2.x - startPos2.x;
@ -2373,22 +2375,24 @@ bool CheckCollisionLines(Vector2 startPos1, Vector2 endPos1, Vector2 startPos2,
float div = rx*sy - ry*sx; float div = rx*sy - ry*sx;
if (fabsf(div) < FLT_EPSILON) { if (fabsf(div) >= FLT_EPSILON)
return false; {
}
float s12x = startPos2.x - startPos1.x; float s12x = startPos2.x - startPos1.x;
float s12y = startPos2.y - startPos1.y; float s12y = startPos2.y - startPos1.y;
float t = (s12x*sy - s12y*sx)/div; float t = (s12x*sy - s12y*sx)/div;
float u = (s12x*ry - s12y*rx)/div; float u = (s12x*ry - s12y*rx)/div;
if (0.0f <= t && t <= 1.0f && 0.0f <= u && u <= 1.0f) { if ((0.0f <= t) && (t <= 1.0f) && (0.0f <= u) && (u <= 1.0f))
{
collisionPoint->x = startPos1.x + t*rx; collisionPoint->x = startPos1.x + t*rx;
collisionPoint->y = startPos1.y + t*ry; collisionPoint->y = startPos1.y + t*ry;
return true;
collision = true;
} }
return false; }
return collision;
} }
// Check if point belongs to line created between two points [p1] and [p2] with defined margin in pixels [threshold] // Check if point belongs to line created between two points [p1] and [p2] with defined margin in pixels [threshold]