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Re: Text drawing using Quartz in an PowerPlant LPane - how to invert y axis?

Subject: Re: Text drawing using Quartz in an PowerPlant LPane - how to invert y axis?
From: "Steve Mills" <email@hidden>
Date: Fri, 13 May 2005 16:59:44 -0500
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On May 13, 2005, at 16:46, William Hollingworth wrote:

Code that transforms the Quartz origin to be at the upper-left
 CGContextSaveGState (myContext);
CGContextTranslateCTM (myContext, 0, myOrigin.y + myPortHeight);
CGContextScaleCTM (myContext, 1.0f, -1.0f);
// Your drawing code here.
CGContextRestoreGState (myContext);

Here's my routine for vertically flipping the context for a given rect. Note that it also corrects and returns the rect.

CGRect TransformContextToFlipRect(CGContextRef c, CGRect destBox)
{
    CGContextTranslateCTM(c, 0, CGRectGetMaxY(destBox));
    CGContextScaleCTM(c, 1.0, -1.0);
    destBox = CGRectOffset(destBox, 0, -destBox.origin.y);

    return destBox;
}


_________________________________________________________
Steve Mills                              Me: 952-401-6255
Senior Software Architect                         MultiAd
email@hidden                       www.multi-ad.com


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	>Text drawing using Quartz in an PowerPlant LPane - how to invert y axis? (From: William Hollingworth <email@hidden>)

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