cocos2d for iPhone

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

1. 

   tiggybouncer
   Member

   Hello all,

   I'm trying to drag a sprite (that's the child of a 'canvas' sprite) around, however it won't move :(

   I have the following code:
   

   -(void)ccTouchMoved:(UITouch *)touch withEvent:(UIEvent *)event
   {
       CGPoint touchLocation = [self convertTouchToNodeSpace:touch];
   
       if(CGRectContainsPoint ([activePart boundingBox], touchLocation))
       {
           CGPoint oldTouchLocation = [touch previousLocationInView:touch.view];
           oldTouchLocation = [[CCDirector sharedDirector] convertToGL:oldTouchLocation];
           oldTouchLocation = [self convertToNodeSpace:oldTouchLocation];
   
           CGPoint translation = ccpSub(touchLocation, oldTouchLocation);
           CGPoint newPos = ccpAdd(activePart.position, translation);
           activePart.position = newPos;
   
           NSLog(@"Reached function");
       }
   }

   ... but I haven't added the code to stop it from leaving the boundingBox of the canvas, because I don't know how to do that :( Can I have some help please?? :)

   Thanks :)

   Posted 6 months ago #
2. 

   tiggybouncer
   Member

   But hey, I don't mind if I don't have the sprite selection bit yet... I'll add that once I've got the other part working ;)

   Posted 6 months ago #
3. 

   michaelm
   Member

   I was just about to start working on this, possibly for the same reason a crop tool?
   Thinking about it limiting to a bounding box the code would be something like this pseudocode
   assuming anchorPoint (.5, .5)

   int leftEdge = position.x - (width * .5)
   rightEdge = position.x + (width * .5)
   topEdge = position.y - (height * .5)
   bottomEdge = position.y + (height * .5)
   then just check bounds and reset
   if (leftEdge < 0) position.x = width * .5;
   if (rightEdge > boundaryRight) position.x = boundaryRight - width * .5;
   if (topEdge < 0) position.y = height * .5;
   if (bottomEdge > boundaryBottom) position.y = boundaryBottom - height * .5;

   Something like that anyway, I'll probably start writing it tonight so if I run across anything wrong with the idea I'll repost.

   Posted 6 months ago #

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