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POPacman collision detection
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copied!<p>I am trying to create a pacman game to learn XNA, but I am having some problems to get the collision detection working. The game is tile based, where 1 is a wall and 0 is walkable. It then takes the tile you are standing on plus the 4 around it, and if it collides with one of them and the tile value is not 0 will it reset the position to what it was before the move. For some reason however it just doesn't work, it gets randomly stuck and sometimes I can even move though walls. <img src="https://i.stack.imgur.com/Fx20E.png" alt="enter image description here"></p> <p>Here is my collision detection:</p> <pre><code> var oldPos = Position; // Updates the Position base.Update(theGameTime, mSpeed, mDirection); // Test Collidetion Rectangle objRect = new Rectangle((int)Position.X, (int)Position.Y, 32, 32); bool isCollided = false; Vector2 curTitle = GetCurrentTitle(); // Test UP, DOWN, LEFT, RIGHT int tile; Rectangle testRect; if ((int)curTitle.Y < 0 || (int)curTitle.X < 0 || (int)curTitle.Y >= map.MapSizeWidth - 1 || (int)curTitle.X >= map.MapSizeHeight - 1) isCollided = true; if (!isCollided) { tile = map.Tiles[(int)curTitle.Y, (int)curTitle.X]; testRect = new Rectangle(((int)curTitle.X) * map.TileSize, ((int)curTitle.Y) * map.TileSize, map.TileSize, map.TileSize); if (tile != 0 && rectangle_collision(testRect, objRect)) isCollided = true; if (curTitle.Y != 0) { tile = map.Tiles[(int)curTitle.Y - 1, (int)curTitle.X]; testRect = new Rectangle(((int)curTitle.X) * map.TileSize, ((int)curTitle.Y - 1) * map.TileSize, map.TileSize, map.TileSize); if (tile != 0 && rectangle_collision(testRect, objRect)) isCollided = true; } tile = map.Tiles[(int)curTitle.Y + 1, (int)curTitle.X]; testRect = new Rectangle(((int)curTitle.X) * map.TileSize, ((int)curTitle.Y - 1) * map.TileSize, map.TileSize, map.TileSize); if (tile != 0 && rectangle_collision(testRect, objRect)) isCollided = true; if (curTitle.X != 0) { tile = map.Tiles[(int)curTitle.Y, (int)curTitle.X - 1]; testRect = new Rectangle(((int)curTitle.X - 1) * map.TileSize, ((int)curTitle.Y) * map.TileSize, map.TileSize, map.TileSize); if (tile != 0 && rectangle_collision(testRect, objRect)) isCollided = true; } tile = map.Tiles[(int)curTitle.Y, (int)curTitle.X + 1]; testRect = new Rectangle(((int)curTitle.X + 1) * map.TileSize, ((int)curTitle.Y) * map.TileSize, map.TileSize, map.TileSize); if (tile != 0 && rectangle_collision(testRect, objRect)) isCollided = true; } if (isCollided) Position = oldPos; </code></pre> <p>Can any one see why my collision detection is not working?</p> <p><strong>EDIT:</strong> I have uploaded the whole project to <a href="http://sogaard.us/Pacman.zip" rel="nofollow noreferrer">http://sogaard.us/Pacman.zip</a></p>

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