BoundingBox.lua

This script is used for Bounding Box Collision Detection. It will see if two rectangular objects over-lap. It returns true if there is a collision, and false otherwise.

This form of collision detection is not suited for games that have lots of circles and non-rectangular shapes, since the invisible space will be considered part of the collision rectangle. However, this should not be a problem for games such as Space Invaders clones.

-- Collision detection function.
-- Checks if a and b overlap.
-- w and h mean width and height.
function CheckCollision(ax1,ay1,aw,ah, bx1,by1,bw,bh)

  local ax2,ay2,bx2,by2 = ax1 + aw, ay1 + ah, bx1 + bw, by1 + bh
  return ax1 < bx2 and ax2 > bx1 and ay1 < by2 and ay2 > by1
end