Problems stopping my sprite at map wall!

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Problems stopping my sprite at map wall!

(6 posts) (2 voices)

Started 1 year ago by Abrown
Latest reply from Abrown

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Abrown
Member
Hey guys, I have a tmx tilemap loaded into my project with a layer specifically for collisions that detects collisions fine!

My problem is a simple one (in theory), so forgive me if im missing an obvious solution. I cant figure out how to get my sprite to stop moving when it detects one of these tiles! My code is as follows
```
-(void) update:(ccTime)delta
{
	int pos1X = floor(tank.position.x / tileMap.tileSize.width);
	int pos1Y = floor(tileMap.mapSize.height - (tank.position.y / tileMap.tileSize.height));

	collisionLayer = [tileMap layerNamed:@"Collision"];
	unsigned int gid1 = [collisionLayer tileGIDAt:ccp(pos1X, pos1Y)];

	if (gid1 ==11) {
	 	[self stopAllActions];
		NSLog(@"COLLISION!");
	}
}
```
as you can see i added an NSLog statement to tell me when my player is on a tile, the map follows the sprite using CCFollow, so the sprite stays in the moddle and it is controlled using a joystick.

PLEASE HELP.

thanks in advance
Posted 1 year ago #
Abrown
Member

anyone around to help?

Posted 1 year ago #

Shogan
Member

This tutorial explains a method of how you would do this:

http://www.raywenderlich.com/1186/collisions-and-collectables-how-to-make-a-tile-based-game-with-cocos2d-part-2

What I am doing in my tilemap test project, is in the update method, to move my player, by calling the following method.

[self setPlayerPosition:ccpAdd(_player.position,ccp(-4,0))];

The above would move my player to the left on the X axis (by 4 pixels).

That calls the following bit of code:

-(void)setPlayerPosition:(CGPoint)position {

	CGPoint tileCoord = [self tileCoordForPosition:position];
	int tileGid = [_meta tileGIDAt:tileCoord];
	if (tileGid) {
		NSDictionary *properties = [_tileMap propertiesForGID:tileGid];
		if (properties) {

			//COLLISIONS
			NSString *collision = [properties valueForKey:@"Collidable"];
			if (collision && [collision compare:@"True"] == NSOrderedSame) {
				CCLOG(@"Collided!");
				return;
			}

			//COLLECTABLES
			NSString *collectable = [properties valueForKey:@"Collectable"];
			if (collectable && [collectable compare:@"True"] == NSOrderedSame) {
				[_meta removeTileAt:tileCoord];
				[_foreground removeTileAt:tileCoord];
				[[SimpleAudioEngine sharedEngine] playEffect:@"pickup.caf"];
			}
		}
	}

	//if the above return was hit (the condition was true) then this function does not get this far, and
	//therefore does not set the player's position below (_player.position = position;)

	_player.position = position;

}

So it runs through the above bit of code, and if it gets to a collision, a "return;" is called, and the bit of code right at the end, setting the player's position is not called. Therefore the player does not move.

If you go through the complete tutorial I linked above you'll see exactly how it works. Hope that helps :)

Posted 1 year ago #

Abrown
Member

Ah finally :) thank you so much! big help

Posted 1 year ago #
Abrown
Member

@Shogan Great start but i seem to have a problem. When i use the above code, and use the

- (CGPoint)tileCoordForPosition:(CGPoint)position

mentioned in the tutorial, my player just moves to the position (-4,0) and i can move behind this location but not move ahead of it? Why do you think this is?

What i am trying to achieve is, my tank (CCSprite) which is moved via a joystick is created on the main GameScene. There is a level class (CCLayer) which declares and creates a tilemap, and i want to make this class control the borders of the level. The level layer is then added to the GameScene (CCScene) class etc...I wonder if this is the correct way to structure a game? this is the first game i coded so I may have gone the wrong way in terms of architecture so any information on better/different ways to structure games would be much appreciated too :)

Sorry if im asking too much in 1 thread! im just keen to learn, thanks

Posted 1 year ago #
Abrown
Member

@Shogan, so i got the map to scroll with the player, and stop at the wall using your tutorial (awesome btw). My (hopefully final) problem with the map is that it now scrolls much slower than the player moves! i was thinking maybe this is because they are on different layers?

Posted 1 year ago #

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