mp_draw not drawing marked cells as red; what am I doing wrong?

[whale_cancer]

I am debugging and noticed marked solid tiles were not being displayed as solid when drawing the mp_grid (i.e. all cells are green). I am quite certain global.tile_collision is working as my debugging message indicate the tile_collision coordinates are indeed being marked as either 0 or 1 depending on what mode my brush is in.

Thus, I think it is something here, in my draw code. I know this is inefficient, but this is just for debugging and my actual mp_grids when in-game will be handled elsewhere.

Anybody know why this is happening?

///Draw Collision
if (global.brush_mode == 'Mark Solid') || (global.brush_mode == 'Mark Free')
{
    t_mpG = mp_grid_create(0, 0, global.mapWidth * 16, global.mapHeight * 15, 16, 16);
   
    for (h = 0; h < global.mapHeight * 15; h += 1)
    {
        for (w = 0; w < global.mapWidth * 16; w += 1)
        {
            if ds_grid_get(global.tile_collision, w, h)
            {
                mp_grid_add_cell(t_mpG, global.mapWidth * 16, global.mapHeight * 15);
            }
        }
    }
    draw_set_alpha(0.25)
    mp_grid_draw(t_mpG);
    draw_set_alpha(1);
    mp_grid_destroy(t_mpG);
}

 

[SyntaxError]

Should those multiplies be divides?

 

[whale_cancer]

Should those multiplies be divides?

No. Map size represents chunks of cells. The multiplication is to turn those chunks into an appropriate number of individual cells. This works everywhere else I use it.

 

[SyntaxError]

Ahh, I think
mp_grid_add_cell(t_mpG, global.mapWidth * 16, global.mapHeight * 15);
should be..
mp_grid_add_cell(t_mpG, w * 16, h * 15);
You're adding the same cell with each iteration of the for loops.

 

[whale_cancer]

Ahh, I think
mp_grid_add_cell(t_mpG, global.mapWidth * 16, global.mapHeight * 15);
should be..
mp_grid_add_cell(t_mpG, w * 16, h * 15);
You're adding the same cell with each iteration of the for loops.

Brilliant! Thank you! I guess I was just not in the right mental state at the time.