How do you position a larger NSImage inside of a smaller NSImageView programmatically?

Question

Let's say I have an NSImage that's 100x100. I also have an NSImageView that's 50x50. Is there a way I can place the NSImage at coordinates inside the NSImageView, so I can control which part of it shows? It didn't seem like NSImage had an initWithFrame method...

Answer 1

I don't believe so, but it's trivial to roll your own NSImageView equivalent that supports center/stretch options by drawing the image yourself.

Answer 2

I did this in my NSImageView subclass, as Andrew suggested.

- (void)drawRect:(NSRect)rect
{
    [super drawRect:rect];
    NSRect cropRect = NSMakeRect(x, y, w, h);
    [image drawAtPoint:NSZeroPoint
              fromRect:cropRect
             operation:NSCompositeCopy
              fraction:1];
}

Answer 3

Make your imageview as big as the image, and put it inside a scrollview. Hide the scrollers if you want. No need for subclassing in this case.

Answer 4

NSImageView has a method -setImageAlignment: which lets you control how the image is aligned within the image view. Unfortunately, if you want to display part of the image that doesn't correspond to any of the NSImageAlignment values, you're going to have to draw the image programmatically.