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PORotated Clipping Node in Cocos2d
 

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  1. PORotated Clipping Node in Cocos2d
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    <p>I'm using the clipping node here: <a href="http://www.learn-cocos2d.com/2011/01/cocos2d-gem-clippingnode" rel="nofollow">http://www.learn-cocos2d.com/2011/01/cocos2d-gem-clippingnode</a></p> <p>ClippingNode.h</p> <pre><code>#import "cocos2d.h" @interface ClippingNode : CCNode { CGRect clippingRegionInNodeCoordinates; CGRect clippingRegion; } @property (nonatomic) CGRect clippingRegion; @end </code></pre> <p>ClippingNode.m</p> <pre><code>#import "ClippingNode.h" @interface ClippingNode (PrivateMethods) -(void) deviceOrientationChanged:(NSNotification*)notification; @end @implementation ClippingNode -(CGRect) clippingRegion { return clippingRegionInNodeCoordinates; } -(void) setClippingRegion:(CGRect)region { // keep the original region coordinates in case the user wants them back unchanged clippingRegionInNodeCoordinates = region; self.position = clippingRegionInNodeCoordinates.origin; self.contentSize = clippingRegionInNodeCoordinates.size; // convert to retina coordinates if needed region = CC_RECT_POINTS_TO_PIXELS(region); // respect scaling clippingRegion = CGRectMake(region.origin.x * scaleX_, region.origin.y * scaleY_, region.size.width * scaleX_, region.size.height * scaleY_); } -(void) setScale:(float)newScale { [super setScale:newScale]; // re-adjust the clipping region according to the current scale factor [self setClippingRegion:clippingRegionInNodeCoordinates]; } -(void) deviceOrientationChanged:(NSNotification*)notification { // re-adjust the clipping region according to the current orientation [self setClippingRegion:clippingRegionInNodeCoordinates]; } -(void) visit { glEnable(GL_SCISSOR_TEST); CGPoint worldPosition = [self convertToWorldSpace:CGPointZero]; const CGFloat s = [[CCDirector sharedDirector] contentScaleFactor]; glScissor((clippingRegion.origin.x) + (worldPosition.x*s), (clippingRegion.origin.y) + (worldPosition.y*s), (clippingRegion.size.width), (clippingRegion.size.height)); [super visit]; glDisable(GL_SCISSOR_TEST); } @end </code></pre> <p>However, I need to clip a rotated CCNode. Any idea on how I could accomplish such a task?</p>
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    1. COBy rendering the node to a texture then using the texture in a sprite that can be rotated independently. Does it require the user to interact with the node? If so you would need to do some coordinate convertions between both.
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    2. COYes, the user is scaling, panning, rotating a picture in a rotated frame. Not sure where should I create the CCRenderTexture? at the ClippingNode the parent of ClippingNode?
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