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Update rshapes.c

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Added "CheckCollisionRayLine()" function for 2D raycasting.
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lonelyfloat 2021-12-20 19:20:31 -05:00 committed by GitHub
parent dcb0e62095
commit 1e7919c24e
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1 changed files with 19 additions and 0 deletions
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src/rshapes.c
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@ -1714,6 +1714,8 @@ bool CheckCollisionLines(Vector2 startPos1, Vector2 endPos1, Vector2 startPos2,
return collision;
}
// Check if point belongs to line created between two points [p1] and [p2] with defined margin in pixels [threshold]
bool CheckCollisionPointLine(Vector2 point, Vector2 p1, Vector2 p2, int threshold)
{
@ -1734,6 +1736,23 @@ bool CheckCollisionPointLine(Vector2 point, Vector2 p1, Vector2 p2, int threshol
return collision;
}
bool CheckCollisionRayLine(Vector2 rayPosition, Vector2 rayDirection, Vector2 startPos, Vector2 endPos, Vector2 *collisionPoint)
{
bool collision = false;
Vector2 offsetPosition;
offsetPosition.x = rayPosition.x + rayDirection.x;
offsetPosition.y = rayPosition.y + rayDirection.y;
float denom = (startPos.x - endPos.x)*(rayPosition.y-offsetPosition.y) - (startPos.y - endPos.y)*(rayPosition.x-offsetPosition.x);
if (denom == 0) return collision;
float t = ((startPos.x - rayPosition.x)*(rayPosition.y - offsetPosition.y) - (startPos.y-rayPosition.y)*(rayPosition.x-offsetPosition.x)) / denom;
float u = ((startPos.x - rayPosition.x)*(startPos.y - endPos.y) - (startPos.y-rayPosition.y)*(startPos.x - endPos.x)) / denom;
collision = (t >= 0 && t <= 1 && u >= 0);
if (collision)
*collisionPoint = (Vector2){startPos.x + t * (endPos.x-startPos.x),startPos.y + t * (endPos.y-startPos.y)};
return collision;
}
// Get collision rectangle for two rectangles collision
Rectangle GetCollisionRec(Rectangle rec1, Rectangle rec2)
{