mp_grid_clear_cell(id, h, v);
| 参数 | 描述 |
|---|---|
| id | Index of the mp_grid that is to be used |
| h | Horizontal position of the cell to clear |
| v | vertical position of the cell to clear |
返回: Boolean（布尔值）
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.
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);