Example #1
0
  bool PixelMap::isCollision(const RectMap &rectmap, const IntPoint &pos1, const IntPoint &pos2, const IntRect &rect1, const IntRect &rect2, const Alignment &alignment1, const Alignment &alignment2) const
  {
    IntPoint corner1(pos1), corner2(pos2);
    IntRect framerect1, framerect2;
    IntRect mrect1, mrect2;
    IntRect *cutrect;


    /* Break */
      if(map == NULL)
        return false;


    /* Translate negative axises */
      mrect1 = rect_translate_negative_axises(rect1, size);
      mrect2 = rect_translate_negative_axises(rect2, rectmap.getSize());


    /* Align */
      if(alignment1.getX() != 0) corner1.decX((int)(mrect1.getWidth() * alignment1.getX()));
      if(alignment1.getY() != 0) corner1.decY((int)(mrect1.getHeight() * alignment1.getY()));
      if(alignment2.getX() != 0) corner2.decX((int)(mrect2.getWidth() * alignment2.getX()));
      if(alignment2.getY() != 0) corner2.decY((int)(mrect2.getHeight() * alignment2.getY()));


    /* Framerects */
      framerect1.load(corner1.getX(), corner1.getY(), mrect1.getWidth(), mrect1.getHeight());
      framerect2.load(corner2.getX(), corner2.getY(), mrect2.getWidth(), mrect2.getHeight());


    /* Break */
      if(!size_to_rect(size).isCovering(mrect1))
        throw Exception() << "pixelmap1 doesn't fully cover rect";


    /* Cutrect */
      if((cutrect = framerect1.getCutrect(framerect2)) == NULL)
        return false;


    /* Iterate rects, check pixels */
      for(int r = 0; r < rectmap.getRectCount(); r++)
      {
        int fpx, fpy; /* First pixel to check */
        int lpx, lpy; /* Last pixel to check */

        IntRect srect = rectmap.getRect(r) + point_to_vector(corner2) - IntVector(mrect2.getX(), mrect2.getY());
        IntRect *scutrect;


        /* Clip with cutrect*/
          if((scutrect = srect.getCutrect(*cutrect)) == NULL)
            continue;


        /* Pixels to check */
          fpx = scutrect->getX() - (corner1.getX() - mrect1.getX());
          fpy = scutrect->getY() - (corner1.getY() - mrect1.getY());
          lpx = fpx + scutrect->getWidth() - 1;
          lpy = fpy + scutrect->getHeight() - 1;


        /* Check pixels */
          for(int py = fpy; py <= lpy; py++)
          {
            for(int px = fpx; px <= lpx; px++)
            {
              if(is_pixel(px, py))
              {
                /* Free mem */
                  delete cutrect;
                  delete scutrect;

                /* Collision detected */
                  return true;
              }
            }
          }

        delete scutrect;
      }

    delete cutrect;


    return false;

  }