combine method
Combines another aabb with this one
Implementation
void combine(AABB aabb) {
lowerBound.x =
lowerBound.x < aabb.lowerBound.x ? lowerBound.x : aabb.lowerBound.x;
lowerBound.y =
lowerBound.y < aabb.lowerBound.y ? lowerBound.y : aabb.lowerBound.y;
upperBound.x =
upperBound.x > aabb.upperBound.x ? upperBound.x : aabb.upperBound.x;
upperBound.y =
upperBound.y > aabb.upperBound.y ? upperBound.y : aabb.upperBound.y;
}