The last portion of chapter the Basic Scrolling Using the Pinch Gestures in
ScrollView Programming Guide for iPhone is called
Ensuring that Zoomed Content is Sharp when Zoomed
It has an example (engineering approved) way of handling this. It isn’t the
greatest solution available, but it is the currently recommended method.
On Jun 1, 2010, at 11:03 PM, Development wrote:
> Ok, well I've worked out most of the other issues I've run in to. However the
> one I am now unable to really figure out has to do with zooming scroll view
> contents and winding up with a clear image. The problem is that I'm not
> getting a clear image.
> Is it possible to use the built in zooming methods to zoom an image and keep
> it clear or do I have to basically implement my own zooming methods. I read
> the zooming docs and unfortunately they did not help me to understand what to
> do.
>
> This is the drawing code from the view that is being zoomed.
>
> -(void)drawLayer:(CALayer*)layer inContext:(CGContextRef)context
> {
>
> CGRect newRect = self.bounds;
> float scle =CGContextGetCTM(context).a;
>
> CGRect rect =CGContextGetClipBoundingBox(context);
>
> CGContextSaveGState(context);
> CGContextSetRGBFillColor(context, 1.0,1.0,1.0,1.0);
> CGContextFillRect(context,self.bounds);
> CGContextTranslateCTM(context, 0.0, newRect.size.height);
> CGContextScaleCTM(context, 1.0, -1.0);
> CGContextScaleCTM(context, scle,scle);
>
> CGAffineTransform pdfTransform = CGPDFPageGetDrawingTransform(myPage,
> kCGPDFCropBox, newRect, 0, true);
> CGContextConcatCTM(context, pdfTransform);
> CGContextDrawPDFPage(context, myPage);
>
> CGContextRestoreGState(context);
> }
>
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