rectangle_in_circle


Description

This function will check a rectangular area that you define to see if it is either not in collision, completely within the destination bounds, or if it is simply touching, a defined circular area. If they are not touching at all the function will return 0, if the source is completely within the destination it will return 1, and if they are simply overlapping then it will return 2. The image below illustrates this:


Syntax:

rectangle_in_circle(sx1, sy1, sx2, sy2, x, y, rad);

Argument Description
sx1 The x coordinate of the left side of the source rectangle.
sy1 The y coordinate of the top side of the source rectangle.
sx2 The x coordinate of the right side of the source rectangle.
sy2 The y coordinate of the bottom side of the source rectangle.
x The x coordinate of the centre of the circle
y The y coordinate of the centre of the circle.
rad The x coordinate of the second side of the triangle to check.


Returns:

Real


Example:

inst = instance_nearest(x, y, obj_Bullet);
if instance_exists(inst)
   {
   if rectangle_in_circle(inst.x - 5, inst.y - 5, inst.x + 5, inst.y + 5, x, y - 25, 20) > 0
      {
      hit = true;
      }
   }

The above code uses the rectangle_in_circle function to check for a collision within a circular area and the rectangle around a found instance. If there is a collision (either an edge overlap or encompassed) then a variable will be set to true.