cocos2d for iPhone

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

1. 

   petem
   Member

   Suppose I have grossini animated using a spriteSheet, and I also have him moving about the screen via an action CCSequence. My user is supposed to touch him, and I expect to use CGRectContainsPoint to see if the touch point is in the grossini frame at the time. But how does one select the correct frame? See some attempts below, but the tRect I think is wrong in both cases. How to find suitable rectangle?

   - (BOOL)containsTouchLocation:(UITouch *)touch
   {
   #if	1
   	CGPoint location = [touch locationInView:[touch view]];
   	CGPoint convertedLocation = [[CCDirector sharedDirector] convertToGL:location];
   	CGRect tRect= grossini.textureRect;
   	CGPoint tapPosition = [self convertToNodeSpace:convertedLocation];
   
   	NSLog(@"tRect(%f %f) tapPos(%f %f)", tRect.size.width, tRect.size.height, tapPosition.x, tapPosition.y);
   	return CGRectContainsPoint(tRect, tapPosition);
   #else
   	CGRect tRect = [[grossini displayedFrame] rectInPixels];
   	CGPoint tapPosition = [self convertTouchToNodeSpaceAR:touch];
   
   	NSLog(@"tRect(%f %f) tapPos(%f %f)", tRect.size.width, tRect.size.height, tapPosition.x, tapPosition.y);
   	return CGRectContainsPoint(tRect, tapPosition);
   #endif
   }

   Posted 1 year ago #
2. 

   Eko Mirhard
   Member

   Rect of a SpriteFrame doesn't reflect the actual position of the sprite relative to the layer, hence the incorrect rect value. You need to consider the actual position of the sprite as well

   Posted 1 year ago #
3. 

   petem
   Member

   Yes, so how to retrieve/calculate the actual rect to apply? Or do I calculate based on touch point and grossini position with hardcoded knowledge of a suitable frame?

   Posted 1 year ago #
4. 

   petem
   Member

   Based on http://www.cocos2d-iphone.org/forum/topic/3328 for help, I now have
   but the rect area is not as tight as I expected. Anyway, this seems like the right track.
   Thanks.

   - (BOOL)containsTouchLocation:(UITouch *)touch
   {
   	float x = [grossini position].x - ([grossini contentSize].width)/2;
   	float y = [grossini position].y - ([grossini contentSize].height)/2;
   	float w = [grossini contentSize].width;
   	float h = [grossini contentSize].height;
   	CGRect tRect = CGRectMake(x, y, w, h);
   	CGPoint tapPosition = [touch locationInView: [touch view]];
   	tapPosition = [[CCDirector sharedDirector] convertToGL: tapPosition];
   
   	//NSLog(@"tRect(%f %f) tapPos(%f %f)", tRect.size.width, tRect.size.height, tapPosition.x, tapPosition.y);
   	return CGRectContainsPoint(tRect, tapPosition);
   }

   Posted 1 year ago #

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