cocos2d for iPhone

A fast, easy to use, free, and community supported 2D game engine

1. 

   Abrown
   Member

   Hey guys, no one seems to be able to help me on this problem for some reason, im just stumped. Basically i have a tilemap that scrolls and keeps the player in the center and the player can move to the edge of the map. I use a joystick to move the player, all the tutorials i have found move the player with touch so its safe to say i know how to do that almost fluently.

   The problem im having is getting the player to recognise the boundary of the level (edge of the map). At the moment i have a method that returns true if the tile is blocked, and a movement method in the player class that uses the isTileBlocked method as a parameter; so if the tile is blocked the move is void. This works, but when the player hits a blocked tile, it just stops and wont move as there is a constant collision and therefore the move method is overridden. I tried adding a statement similar to if tileIsBlocked self.position = self.position +1, and this works but only for half of the map, as the other half would need a -1 in place of the +1.

   I know this is a lot to take in but this problem is driving me mental and its one ive sort of put to the bottom of the pile but now i need to fix it.

   Any help/solutions would be amazing, i can post code if anyone requires it.
   Thanks in advance

   Posted 1 year ago #
2. 

   Dragyn
   Member

   I'm assuming you might hit a blocked tile in any direction, right? I'd suggest instead of automatically adding 1 to the player's position, compare the position of the player and the blocking tile. If the player's x is greater than the tile, then +1 to the player's x. If the player's x is less than the tile, then -1 to the player's x. You can do the same type of comparison on the y values, if you are going in both directions.

   Posted 1 year ago #
3. 

   Abrown
   Member

   Tanks for your reply! Yes that definitely sounds like the solution Im looking for, thank you very much. Would it be possible to post an example? thanks

   Posted 1 year ago #
4. 

   Abrown
   Member

   anyone? xD

   Posted 1 year ago #
5. 

   Tiron
   Member

   i did it like this:
   oldPos is the players old position
   checkpoint is a CGPoint with the target position
   objectWidthHalf is the players half width, because x0,y0 is the centerpoint of the player sprite.
   lastCollisionPoint is a tilecoordinate where the collision took part, which is set in method checkcollisionmap

   //check position to the right
   		if(checkpoint.x > oldPos.x){
   
   			if([self checkcollisionmap: ccp(checkpoint.x+objectWidthHalf,oldPos.y-objectHeightHalf+1)] == NO &&
   			   [self checkcollisionmap: ccp(checkpoint.x+objectWidthHalf,oldPos.y+objectHeightHalf)] == NO)
   				newxpos = checkpoint.x;
   			else {
   				newxpos = (lastCollisionPoint.x*theMap.tileSize.width)-objectWidthHalf;
   			}
   		}

   Posted 1 year ago #
6. 

   Abrown
   Member

   @Tiron thanks for your help. can i just ask, how would u store the players old position? thanks

   Posted 1 year ago #
7. 

   Tiron
   Member

   @Abrown its stored in a CGPoint:

   its the playersprites current position.

   Posted 1 year ago #

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