[iPhone] UIImage drawInRect not scaling image
[iPhone] UIImage drawInRect not scaling image
- Subject: [iPhone] UIImage drawInRect not scaling image
- From: "Stuart A. Malone" <email@hidden>
- Date: Mon, 10 Mar 2008 08:23:21 -0400
(Please correct me if I'm on the wrong list. Cocoa-dev seems to be
the list suggested at the end of the iPhone developer videos, and I
can't find any other.)
I've begun working with the iPhone SDK, and quickly ran into what
looks like a bug in UIImage drawInRect: and
drawInRect:blendMode:alpha: in the iPhone simulator. But before
filing a bug report, I wanted to check with others to make sure that
I'm not suffering from some misunderstanding of what these functions
are supposed to do.
I'm trying to draw an image obtained from the UIPickerImageController
so that it fits within a particular portion of my custom UIView. I
find that using either of the drawInRect: routines, the image is drawn
with the correct bottom-left corner, but the image is not scaled to
fit the height and width of the rectangle. I've worked around the
problem using the lower-level CGContext routines as follows:
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSaveGState(context);
CGContextTranslate(context, 0, rect.origin.y + rect.origin.y +
rect.size.height);
CGContextScale(context, 1, -1);
CGContextSetBlendMode(context, blendMode);
CGContextDrawImage(context, rect, image.CGImage);
CGContextRestoreGState(context);
This results in the image being scaled to fit exactly in the rectangle
I specified. Am I correct that this is also how the UIImage
drawInRect: routines are supposed to work?
Best wishes,
--Stuart A. Malone
Llamagraphics, Inc.
Makers of Life Balance personal coaching software
http://www.llamagraphics.com/
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