Answers for "Box and Boc collision C++"

Box and Boc collision C++

bool AABBvsAABB( Manifold *m )
{
  // Setup a couple pointers to each object
  Object *A = m->A
  Object *B = m->B
  
  // Vector from A to B
  Vec2 n = B->pos - A->pos
  
  AABB abox = A->aabb
  AABB bbox = B->aabb
  
  // Calculate half extents along x axis for each object
  float a_extent = (abox.max.x - abox.min.x) / 2
  float b_extent = (bbox.max.x - bbox.min.x) / 2
  
  // Calculate overlap on x axis
  float x_overlap = a_extent + b_extent - abs( n.x )
  
  // SAT test on x axis
  if(x_overlap > 0)
  {
    // Calculate half extents along x axis for each object
    float a_extent = (abox.max.y - abox.min.y) / 2
    float b_extent = (bbox.max.y - bbox.min.y) / 2
  
    // Calculate overlap on y axis
    float y_overlap = a_extent + b_extent - abs( n.y )
  
    // SAT test on y axis
    if(y_overlap > 0)
    {
      // Find out which axis is axis of least penetration
      if(x_overlap > y_overlap)
      {
        // Point towards B knowing that n points from A to B
        if(n.x < 0)
          m->normal = Vec2( -1, 0 )
        else
          m->normal = Vec2( 0, 0 )
        m->penetration = x_overlap
        return true
      }
      else
      {
        // Point toward B knowing that n points from A to B
        if(n.y < 0)
          m->normal = Vec2( 0, -1 )
        else
          m->normal = Vec2( 0, 1 )
        m->penetration = y_overlap
        return true
      }
    }
  }
}