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[shapes] CheckCollisionPointTriangle (fix), CheckCollisionPointLine (new routine) (#1695)

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* CheckCollisionPointTriangle

* New feature proposal to existing collision detection routines.
It checks if point [point] belongs to line created between two points [p1] and [p2] with defined margin in pixels[threshold].
1693
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mkupiec1 2021-03-31 16:50:05 +02:00 • committed by GitHub
parent 98a2e16d4d
commit 3d1a05d588
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1 changed files with 21 additions and 1 deletions
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src/shapes.c
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@ -1468,7 +1468,7 @@ bool CheckCollisionPointTriangle(Vector2 point, Vector2 p1, Vector2 p2, Vector2
float gamma = 1.0f - alpha - beta; float gamma = 1.0f - alpha - beta;
if ((alpha > 0) && (beta > 0) & (gamma > 0)) collision = true; if ((alpha > 0) && (beta > 0) && (gamma > 0)) collision = true;
return collision; return collision;
} }
@ -1545,6 +1545,26 @@ bool CheckCollisionLines(Vector2 startPos1, Vector2 endPos1, Vector2 startPos2,
return true; return true;
} }
// 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)
{
bool collision = false;
float dxc = point.x - p1.x;
float dyc = point.y - p1.y;
float dxl = p2.x - p1.x;
float dyl = p2.y - p1.y;
float cross = dxc*dyl - dyc*dxl;
if (abs(cross) < threshold*fmaxf(fabsf(dxl), fabsf(dyl)))
{
if (fabsf(dxl) >= fabsf(dyl)) collision = (dxl > 0)? ((p1.x <= point.x) && (point.x <= p2.x)) : ((p2.x <= point.x) && (point.x <= p1.x));
else
collision = (dyl > 0)? ((p1.y <= point.y) && (point.y <= p2.y)) : ((p2.y <= point.y) && (point.y <= p1.y));
}
return collision;
}
// Get collision rectangle for two rectangles collision // Get collision rectangle for two rectangles collision
Rectangle GetCollisionRec(Rectangle rec1, Rectangle rec2) Rectangle GetCollisionRec(Rectangle rec1, Rectangle rec2)
{ {