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POCocos2D magnification - making the code dynamic and using an image
 

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  1. POCocos2D magnification - making the code dynamic and using an image
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    <p>I have found the following code and I need help with editing it. I am not really familiar with texture rendering. </p> <p>First of all, init method takes a rect and magnifies only that area? How can I make it more dynamic and magnify only whatever is underneath the magnifying glass?</p> <p>Secondly, Is it possible to change the shape to circle rather than rectangle? Or Can I use an image as the frame of the magnifying glass?</p> <p>Here is the code..</p> <p>Cheers..</p> <p>.h file</p> <pre><code>#import &lt;Foundation/Foundation.h&gt; #import "cocos2d.h" @interface Magnify : CCNode { BOOL active; CGRect rect; CGFloat magnifyScale; CCNode *renderNode; CCRenderTexture *renderTexture; } - (id)initWithNodeToMagnify:(CCNode *)n rect:(CGRect)rectToMagnify scale:(CGFloat)scale; - (void)enable; - (void)disable; </code></pre> <p>.m file</p> <pre><code>#import "Magnify.h" @implementation Magnify - (id)initWithNodeToMagnify:(CCNode *)n rect:(CGRect)rectToMagnify scale:(CGFloat)scale { if (self = [super init]) { self.visible = active = NO; renderNode = n; rect = rectToMagnify; magnifyScale = scale; renderTexture = [[CCRenderTexture renderTextureWithWidth:rect.size.width height:rect.size.height] retain]; [self addChild:renderTexture]; } return self; } - (void)enable { self.visible = active = YES; [self scheduleUpdate]; } - (void)disable { self.visible = active = NO; [self unscheduleUpdate]; } - (void)drawAreaToTexture { [renderTexture beginWithClear:0.0 g:0.0 b:0.0 a:1.0]; // shift the renderNode's position to capture exactly the rect we need CGPoint originalPosition = renderNode.position; renderNode.position = ccpSub(originalPosition, rect.origin); // scale the node as we want CGFloat originalScale = renderNode.scale; renderNode.scale = magnifyScale; [renderNode visit]; // shift renderNode's position back renderNode.position = originalPosition; // scale back renderNode.scale = originalScale; [renderTexture end]; } - (void)update:(ccTime)dt { [self drawAreaToTexture]; } - (void)dealloc { [renderTexture release]; [super dealloc]; } @end </code></pre>
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    1. COYou can't use a circle shape. You may be able to achieve the effect by writing a custom fragment shader if you're using cocos2d 2.0. But if you're not familiar with texture rendering, I believe this is way outside your range of expertise. Me neither, I couldn't write a magnifying effect without spending weeks researching and experimenting.
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      1. USLearnCocos2D
    2. COlike LearnCocos2D said, you cannot use a circle shape, but you can use a circle image instead, and do things with it. I wrote some code a while back (not for magnifying but for a "scratch" effect) and I am looking for it but can't find it. ill post it once i find it.
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      1. UShjm
    3. COCould you use CCLens3D to get the 'effect' of magnification in a circular manner? I've done this in a game. It's not true magnification, butit may provide the visual effect you're after.
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      1. USPKCLsoft
 

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