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8711578
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2012-01-03T11:27:51.310
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2012-01-03T11:27:51.310
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2012-04-05T23:36:39.323
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2012-04-05T23:36:39.323
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 I have tried a different approach to implement my functionality of scribbling over a glSurfaceView and simultaneously be able to zoom in and zoom out. I have done all the scribbling over normal android provided canvas. In the background I have a GLSurfaceView. On top of it i have a scribbble view (http://www.java2s.com/Code/Android/2D-Graphics/Classforthescribblememopad.htm). I have set the background of ScribbleView as TRANSPARENT. When I am done Scribbling I put scribbling off using onClickListener of a Button (when scribbling is off user can zoom in and zoom out). I can zoom in or out using ScaleGestureDetector.SimpleOnScaleGestureListener. In its <code>onScale()</code> I am using <code>mScaleFactor=(mScaleFactor * detector.getScaleFactor());</code> Where mScaleFactor is initlised to 1f and mScaleFactor is used to track the current ScalingFactor. For scaling of glSurface I use <code>glScalef(mScaleFactor,mScaleFactor)</code> and for canvas scaling I use <code>canvas.scale(mScaleFactor,mScaleFactor,getWidth()/2,getHeight()/2)</code>. I have set the pivot point to middle of the view as the coordinates of the canvas is such that its origin is at top left. After I scale up or scale down the canvas Then for correct scribbling I have in onTouchEvent(Event event) of Scribble view I have done the below mapping for the <pre><code>event.getX() and event.getY(). x=(event.getX()- getWidth() / 2) / getmScaleFactor() + getWidth() / 2; y=(event.getX()- getWidth() / 2) / getmScaleFactor() + getWidth() / 2; </code></pre> Now when I do scribbling on the zoomed in or out canvas I can scribble at the point where I touch the screen correctly. I hope I have been able to give you all some insight of my approach. Thanks Krishna. 
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1. POHow do I implement scribble view in OpenGL in android?
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1. USTarunG
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1. USnits.kk
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