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?
_______________________________________________
Cocoa-dev mailing list ([email protected])
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com
This email sent to [email protected]
