Several years ago, I wrote this sample code project:
http://developer.apple.com/samplecode/Transformed_Image/index.html
It demonstrates the use of NSAffineTransform to rotate, scale, and shear images.
-jcr
On Apr 29, 2011, at 7:48 AM, Amy Heavey wrote:
> Hi,
>
> I'm trying to generate a new image that is made up of a combination of other
> images.
>
> As I iterate over the array holding the images I want to do is...
> - place the componant image in the new canvas at a certain point (150,187)
> - rotate the componant image by a certain value (calculated previously)
>
> I don't mind how the image fits in the new canvas, it doesn't have to be
> completely within it.
>
> I think I need to use NSAffineTransform?
>
> I was using drawinrect previously for non-rotated movement.
>
> Do I need to draw the componant image to the canvas first then rotate it?
>
> The code I have at the moment is
>
> [code]
> //calc rotation
> double rotation = 360 / ki;
> double rotateby = rotation;
>
> //set coordinates to x,y -> 150,187 to start
> float x = 150;
> float y = 187;
>
> //for each image
> NSEnumerator *imageLoop = [kitImages objectEnumerator];
> NSString *imgPath;
>
> while ((imgPath = [imageLoop nextObject])) {
> NSImage *img = [[NSImage
> alloc]initWithContentsOfFile:imgPath];
>
> //rotate image
>
>
> //apply image to view
> [targetImage lockFocus];
>
>
> //[img drawInRect:NSMakeRect(x,y,xb,yb)
> fromRect:NSMakeRect(150,150,0,0) operation:NSCompositeCopy fraction:1];
>
> //set new rotation
> rotation = rotation+rotateby;
> [/code]
>
> I've tried looking at some of the samples, but they seem to be cover rotating
> in place and resizing which is more complicated than I'm looking for. I'm
> expecting to effectively have the componant images fan out on the canvas.
>
> If anyone could help me with the process I'd be grateful, do I have to create
> a intermediary image to make the rotated image square?
>
> Thanks,
>
> Amy
>
>
>
> Many Thanks
>
> Amy Heavey
> Willow Tree Crafts
> www.willowtreecrafts.co.uk
>
>
>
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