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Re: Affine Transform
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Re: Affine Transform


  • Subject: Re: Affine Transform
  • From: Ian was here <email@hidden>
  • Date: Sat, 11 Feb 2006 18:41:44 -0800 (PST)

Here is some sample code that demonstrates image
rotation, amongst other things...


http://www.howleware.com/apps/simple_sprite_engine.hqx




--- Terry Heaford <email@hidden>
wrote:

> A newbie question:
>
> I am really struggling with affine transforms to
> rotate an image
> contained in an NSView which is a subview of a
> scrollview.
>
> The image is larger than than the visible size of
> the scrollview.
>
> The code I have from drawRect is below:
>
> 	if (image)
> 	{
> 		deg = 45;
>
> 		NSRect imageRect = NSMakeRect(0,0,[image
> size].width,[image
> size].height);
>
> 		NSPoint imageDrawPoint = NSMakePoint([self
> visibleRect].size.width/
> 2, [self visibleRect].size.height/2);
>
> 		NSAffineTransform *trans = [NSAffineTransform
> transform];
> 		[trans translateXBy:imageDrawPoint.x
> yBy:imageDrawPoint.y];
> 		[trans rotateByDegrees:deg];
> 		[trans translateXBy:-imageDrawPoint.x
> yBy:-imageDrawPoint.y];
> 		[trans concat];
>
> 		[image drawAtPoint:NSZeroPoint fromRect:imageRect
>
> operation:NSCompositeCopy fraction:opacity];
>
> 	}
>
> This seems to rotate the image correctly but how do
> I size the frame
> or the bounds (not sure which or both) to the
> correct size for the
> rotated image allowing it to be scrolled within the
> scrollview and
> how do I locate the image within the frame
> correctly.
>
> Thanks in advance
>
> Terry
>
>
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