Cocos2d-iPhone Function to Check if the Touch Input Was Zoom out

leothenerd 5:54 pm on January 3, 2010 | Answers: 1    
Tags: function (49), input (23), phone (25), touch (33)

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• leothenerd 5:54 pm on January 3, 2010
  

  
  -(BOOL)wasZoomOut:(NSSet *)touches :(UIEvent *)event
  {
    NSSet *allTouches = [event allTouches];
    
    if(2 != [allTouches count])
      return FALSE;
    
    UITouch *touch = [[allTouches allObjects] objectAtIndex:0];
    
    CGPoint start1 = [touch previousLocationInView:[touch view]];
    CGPoint end1 = [touch locationInView:[touch view]];
    start1 = _icRotateRealWorld(start1);
    end1 = _icRotateRealWorld(end1);
    
    touch = [[allTouches allObjects] objectAtIndex:1];
    
    CGPoint start2 = [touch previousLocationInView:[touch view]];
    CGPoint end2 = [touch locationInView:[touch view]];
    start2 = _icRotateRealWorld(start2);
    end2 = _icRotateRealWorld(end2);
    
    float initialDistance = icDistanceBetweenTwoPoints(start1, start2);
    float endDistance = icDistanceBetweenTwoPoints(end1, end2);
    
    if(endDistance < initialDistance)
    {
      return TRUE;
    }
    
    return FALSE;
  }