That's pretty much where I started with this code. However it's still fuzzy.
I can scale the view itself and it's perfectly clear but the origin is all
messed up and it's offset halfway out of it's parent view. thats what I tried
here:CGContextScaleCTM(context, scle,scle);
I've attempted to scale the bounds of the view itself, redraw the content and
then adjust the size of the scrollview's content but that ends up being the
same mess as before. I was hoping I could get a little more information on
rendering an image.
On Jun 1, 2010, at 8:38 PM, Scott Anguish wrote:
> 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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