【GameMaker】 Destructible Terrain

Information about object: obj_terrain

Sprite: spr_terrain
Solid: false
Visible: true
Depth: 0
Persistent: false
Parent:
Children:
Mask:

No Physics Object

Create Event:

execute code:

//set up

w = sprite_width;
h = sprite_height;

//create surface and add sprite
surface = surface_create(w,h); 
surface_set_target(surface); 
draw_sprite(spr_terrain,-1,0,0);
surface_reset_target();

//save surface as spr
spr=sprite_create_from_surface(surface,0,0,w,h,true,true,0,0);
sprite_index=spr;

Step Event:

execute code:

//manage suface
if !surface_exists(surface)
    {
    surface = surface_create(w,h);
    surface_set_target(surface);
    draw_sprite(spr,-1,0,0);
    surface_reset_target();
    }

//create a bomb on mouse press
if mouse_check_button_pressed(mb_left) instance_create(mouse_x,mouse_y,obj_bomb);

Collision Event with object obj_bomb:

execute code:

//set surface
surface_set_target(surface);
draw_set_color(c_white);
draw_circle(other.x-x,other.y-y,32,false);
//reset
surface_reset_target();

//delete the sprite
sprite_delete(spr);
spr=sprite_create_from_surface(surface,0,0,w,h,1,1,0,0);
sprite_index=spr;


with other instance_destroy();//destroy bomb

Other Event: Room End:

execute code:

//clear memory
surface_free(surface);

Information about object: obj_bomb

Sprite: spr_bom
Solid: false
Visible: true