ds_grid_shuffle

/*
**  Usage:
**      ds_grid_shuffle(grid)
**
**  Arguments:
**      grid    ds_grid to shuffle
**
**  Returns:
**      nothing
**
**  GMLscripts.com
*/
{
    var grid,w,h,xx,yy,temp,tx,ty;
    grid = argument0;
    w = ds_grid_width(grid);
    h = ds_grid_height(grid);
    for (xx=0; xx<w; xx+=1) {
        for (yy=0; yy<h; yy+=1) {
            tx = floor(random(w));
            ty = floor(random(h));
            temp = ds_grid_get(grid,xx,yy);
            ds_grid_set(grid,xx,yy,ds_grid_get(grid,tx,ty));
            ds_grid_set(grid,tx,ty,temp);
        }
    }
}