【GAMEMAKER】one way to do a fog of war

 Information about object: objPlayer

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

No Physics Object

Create Event:

execute code:

///set up
enum player_state {
idle,
up,
down,
left,
right
}

dir=player_state.down;
is_moving=false;
image_speed=0.5;

Step Event:

execute code:

///keypress code
if (keyboard_check(vk_left))
{
dir=player_state.left;
is_moving=true;
}
else
if (keyboard_check(vk_right))
{
dir=player_state.right;
is_moving=true;
}
else
if (keyboard_check(vk_up))
{
dir=player_state.up;
is_moving=true;
}
else
if (keyboard_check(vk_down))
{
dir=player_state.down;
is_moving=true;
}
else
{
is_moving=false;
}




///movement
if is_moving
{
switch (dir)
{
case player_state.up:
y -= 4;
break;

case player_state.down:
y += 4;
break;

case player_state.left:
x -= 4;
break;

case player_state.right:
x += 4;
break;
}
}




///animation
if is_moving
{
switch (dir)
{
case player_state.up:
sprite_index=spr_walk_up;
break;

case player_state.down:
sprite_index=spr_walk_down;
break;

case player_state.left:
sprite_index=spr_walk_left;
break;

case player_state.right:
sprite_index=spr_walk_right;
break;
}
}
else
{
switch (dir)
{
case player_state.up:
sprite_index=spr_idle_up;
break;

case player_state.down:
sprite_index=spr_idle_down;
break;

case player_state.left:
sprite_index=spr_idle_left;
break;

case player_state.right:
sprite_index=spr_idle_right;
break;
}
}

//fog


for (i1=objPlayer.x-32; i1<objPlayer.x+128; i1+=32) {
for (i2=objPlayer.y-32; i2<objPlayer.y+128; i2+=32) {
with instance_position(i1,i2,objFog) instance_destroy();
}
}

Information about object: objFog
Sprite: sprFog
Solid: false
Visible: true
Depth: 0
Persistent: 
false
Parent: 
Children: 
Mask: 

No Physics Object