/* Cache the bounding-box of the grid, so the drawing-code can quickly
* figure out the proper scaling to draw onto a given area. */
int lowest_x, lowest_y, highest_x, highest_y;
/* Cache the bounding-box of the grid, so the drawing-code can quickly
* figure out the proper scaling to draw onto a given area. */
int lowest_x, lowest_y, highest_x, highest_y;