NSAffineTransform on iOS
NSAffineTransform on iOS
- Subject: NSAffineTransform on iOS
- From: Pascal Harris <email@hidden>
- Date: Mon, 09 Apr 2012 15:55:45 +0100
I'm trying to write some code for iOS and Wow! I didn't expect it to be so unfamiliar. Kind of like walking into a familiar city, like London, and discovering that everyone is speaking Dutch and no one speaks English. Weird. I'm slowly getting to grips with the differences and similarities - but I'm a bit perplexed by transforms. As I say, I'm writing a tile based game and the following code works very nicely in Mac OS X:
NSGraphicsContext *context = [NSGraphicsContext currentContext];
[context saveGraphicsState];
id transform = [NSAffineTransform transform];
[transform translateXBy:NSMidX(tileFrame) yBy:NSMidY(tileFrame)];
[transform concat];
[self drawTile:tileFrame];
[context restoreGraphicsState];
Unfortunately, my iOS version doesn't work. That isn't to say that it crashes - it just doesn't produce the expected output.
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSaveGState(context);
CGAffineTransform transform;
CGAffineTransformTranslate(transform, CGRectGetMidX(tileFrame), CGRectGetMidY(tileFrame));
CGContextConcatCTM(context, transform);
[self drawTile:tileFrame];
CGContextRestoreGState(context);
I'm sure that my error will be obvious to anyone who isn't a complete newb, but I am - so it isn't obvious to me!
And are there any books that you'd recommend that cover these kind of issues, books to assist a Mac OS X developer write for iOS?
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