This function can be used to clear a specific "cell" of an MP grid. Cells are not calculated as room coordinates, but rather as grid coordinates, where (0,0) is the top let corner of the grid. this means that to clear a cell at a specific position in the room, we must change the x and y coordinates into cell coordinate dividing them by the resolution of the MP grid. The code example below shows how this works.
mp_grid_clear_cell(id, h, v);
| Argument | Type | Description |
|---|---|---|
| id | MP Grid ID | Index of the mp_grid that is to be used |
| h | Real | Horizontal position of the cell to clear |
| v | Real | vertical position of the cell to clear |
with (obj_Box)
{
mp_grid_clear_cell(grid, floor(x / 32), floor(y /32));
instance_destroy();
}
The above code will make all "obj_Box" destroy themselves and have them mark the cells they occupied in the mp_grid indexed in the variable "grid" as free. In this example, we find the appropriate cell by taking the x/y coordinate of the object and dividing them by the resolution of the grid (using floor to keep the values as integers).