cocos2d for iPhone

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

1. 

   GoldenJoe
   Member

   I did some searching and googling, but couldn't find a solution. Basically, I'm using the drawspace.h/c files to draw the shapes of my Chipmunk objects for debugging purposes. It's fine normally, but if I test with a retina display, it seems to be drawing everything with pixels instead of points. Any fixes out there? Thanks.

   Posted 6 months ago #
2. 

   slembcke
   Administrator

   You need to scale by CC_CONTENT_SCALE_FACTOR(). Something like this:
   

   -(void) draw;
   {
   	glDisableClientState(GL_COLOR_ARRAY);
   	glDisableClientState(GL_TEXTURE_COORD_ARRAY);
   	glDisable(GL_TEXTURE_2D);
   
   	glPushMatrix(); {
   		glScalef(CC_CONTENT_SCALE_FACTOR(), CC_CONTENT_SCALE_FACTOR(), 1.0);
   		glLineWidth(1.0f);
   		cpSpaceEachShape(space.space, drawShape, NULL);
   
   		glColor4f(0.5f, 1.0f, 0.5f, 1.0f);
   		cpSpaceEachConstraint(space.space, drawConstraint, NULL);
   	} glPopMatrix();
   
   	glEnableClientState(GL_COLOR_ARRAY);
   	glEnableClientState(GL_TEXTURE_COORD_ARRAY);
   	glEnable(GL_TEXTURE_2D);
   }

   You might also find this useful, it's written for Objective-Chipmunk, but would be trivial to change to work with vanilla Chipmunk: http://files.slembcke.net/temp/ChipmunkDebugNode.tgz

   Posted 6 months ago #
3. 

   GoldenJoe
   Member

   Cool bro. Thanks very much, I'll try it out as soon as I get back to the physics part of my game.

   Posted 6 months ago #
4. 

   EndreOlah
   Member

   Hi,

   I am using this debugnode file, but I am experiencing the same problem with it. Once I change to retina display, the sprite which is linked to the body is at the right position, but the shape and body is just at the half coordinates.

   How can I fix this? I could be able to size the shape to the right size, by scaling it up at the verts, but in objective chipmunk there is a simple body.syncednodes=sprite thing, which make the job and I cannot figure out how can I get the coordinates synced.

   If I change the body position to double, then it moves the sprite as well by doubling its coordinates.

   Thanks for helping me out.

   Posted 3 months ago #
5. 

   EndreOlah
   Member

   Finally, I had an idea to search for the use of the syncednodes variable and I have found that the ChipmunkCocosBody.m is updated the nodes, but the display scale is not considered at all, so I have changed a line from

   node.position = body->p

   to

   node.position = ccp(body->p.x/CC_CONTENT_SCALE_FACTOR(),body->p.y/CC_CONTENT_SCALE_FACTOR());

   as this line is now changing the sprite position to the body location in points and not in pixels, I have to upscale the body and shape coordinates to the pixel coordinates. But this is quote easy, so my problem is solved. I just can hope that nothing else is effected by this in the physics engine. :)))

   Posted 3 months ago #
6. 

   slembcke
   Administrator

   As answered here the issue isn't the size/position of the sprite, but that the version of ChipmunkDebugNode is old and needed to be updated to support the way Cocos2D handles retina.

   Posted 3 months ago #

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