cocos2d for iPhone

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

1. 

   jp16
   Member

   I am looking to draw a transparent rectangle in a class called HitBox using a CGRect object. Is there something aside from "drawPoly" that I could use to draw the rectangle?

   Posted 2 years ago #
2. 

   jp16
   Member

   I created a function to draw a rectangle but it doesn't appear to be working with my collision detection. What is happening is that I see the the rectangles overlapping but no collision is taking place unless there is an excessive amount of overlap. I don't know if it's the collision code that is incorrect or the way I'm drawing the hit boxes.

   // these 2 methods belong to my HitBox class and are used to to draw the hit box

   -(void) update: (CGRect) r;
   {
   x = r.origin.x;
   y = r.origin.y;

   width = r.size.width;
   height = r.size.height;
   }

   -(void) draw
   {
   CGPoint vertices2[] = {
   ccp(x-width/2,y+height/2),
   ccp(x+width/2,y+height/2),
   ccp(x+width/2, y-height/2),
   ccp(x-width/2, y-height/2)
   };
   drawPoly(vertices2, 4, YES);
   }

   // this is my code in my main game loop for detecting collision

   if (!CGRectIsNull(CGRectIntersection(rect1, rect2)))
   {
   NSLog(@"collision!");
   }

   Posted 2 years ago #
3. 

   simo
   Member

   Hmm, try a different collision detection method?
   

   if (CGRectIntersectsRect(rect1, rect2))
   {
   NSLog(@"collision!");
   }

   How often is your main game loop executed? I've read that draw is called as often as possible.
   Are you checking for collisions frequently enough? (this might be a silly idea tbh)

   Posted 2 years ago #
4. 

   Wiko
   Member

   Hi,
   I think you are getting the vertices wrong
   It should be like this:

   `CGPoint vertices2[] = {
   ccp(x,y),
   ccp(x+width,y),
   ccp(x+width, y+height),
   ccp(x, y+height)
   };`

   Posted 1 year ago #
5. 

   abitofcode
   Moderator

   lol, I hope he wasn't waiting on that one ;)

   Posted 1 year ago #

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