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# Thread: Help figuring out pacman barrier collision detect

1. Registered User
Join Date
Sep 2006
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3

## Help figuring out pacman barrier collision detect

Im making a pacman game, and im trying to figure out how to draw the barriers and make sure pacman cant cross the walls. How do i approach this? Thank you muchly.

im obviously no pro, so go easy on me :P

2. Registered User
Join Date
Sep 2006
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3

3. Senior Member
Join Date
Mar 2004
Posts
635
Store your map as a 2D grid.

0 = clear
1 = dot
2 = wall

Decide the size of each wall segment, say 10x10. So every 10 units you'd have a new wall segment or square from the grid.

- player_controls
- store old pacman position
- update new pacman position variables
- check where in grid new pacman position is. If its a wall, change position variables to old pacman position.
- draw pacman

So if pacman is at 152,36 in world coordinates, to find that in grid coordinates, divide by the dimensions of a grid square (10x10).

Code:
```int gx = 152/10  //15
int gy = 36/10    //3

if (map[gx][gy] == 2) //pacman hit a wall
{
pacX = oldX
pacY = oldY
}
else if ( == 1) //pacman ate a dot
{
map[][] = 0
score++;
}```

4. Registered User
Join Date
Sep 2006
Posts
3
wow thank you so much, i would never have thought of that!

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