Question

I am creating a game where where you complete shapes and the area gets filled in. However, if there is an enemy bird within your shape, it will not fill in. I want to make it so that if you do trap a bird within your shape, you will lose a life. How can I write an if statement that pretty much says if the below code doesn’t take place, then you lose a life. If it helps losing a life is called doDie in my code.

-(void)fillMutablePath{



 CGPoint movePoint = CGPointFromString([pointsToFillArray objectAtIndex:0]);

 CGPathMoveToPoint(fillPath, NULL, movePoint.x, movePoint.y);

 for (int i=0; i<[pointsToFillArray count]; i++) {
  CGPoint tempPoint = CGPointFromString([pointsToFillArray objectAtIndex:i]);
  CGPathAddLineToPoint(fillPath, NULL, tempPoint.x, tempPoint.y);

 }


 CGContextAddPath(gameViewObj._myContext, fillPath);
 CGContextFillPath(gameViewObj._myContext);
 CGPathRelease(fillPath);

 [pointsToFillArray removeAllObjects];

}

if(fillMutablePath doesn't take place when making a shape){
[self doDie];
}

Like i said above, the reason fillMutablePath wouldn’t take place is because a bird would be trapped within the shape. Any help would be much appreciated!!

Answer 1

I’m not entirely sure how and where you check if the bird is in the path. I think that right before filling you path you should do (see that if-else):

-(void)fillMutablePath{

    CGPoint movePoint = CGPointFromString([pointsToFillArray objectAtIndex:0]);
    CGPathMoveToPoint(fillPath, NULL, movePoint.x, movePoint.y);
    for (int i=0; i<[pointsToFillArray count]; i++) {
       //...
    }
    CGContextAddPath(gameViewObj._myContext, fillPath);

   if(CGPathContainsPoint(fillPath, nil, bird.center, false)){
      [self doDie];
    }
   else {
      CGContextFillPath(gameViewObj._myContext);
    }
   CGPathRelease(fillPath);

   [pointsToFillArray removeAllObjects];
}

If the bird is in the path die. Else, draw.

Edit after the clarification:

   //...

   CGContextAddPath(gameViewObj._myContext, fillPath);
   CGContextFillPath(gameViewObj._myContext);

   if(CGPathContainsPoint(fillPath, nil, bird.center, false)){
      [self doDie];
   }
   CGPathRelease(fillPath);
   [pointsToFillArray removeAllObjects];
}