Extracting a (smooth) rect from an NSImageView displaying PDF?
Extracting a (smooth) rect from an NSImageView displaying PDF?
- Subject: Extracting a (smooth) rect from an NSImageView displaying PDF?
- From: "J. Mckenzie Alexander" <email@hidden>
- Date: Tue, 13 May 2003 16:07:09 +0100
Hello,
In my app I have an NSImageView displaying a PDF file. I'd like the user to
be able to extract a rectangular region from the displayed PDF and view it
at 10x normal size.
MyImageView is a subclass of NSImageView, defined below (zoomImageView is an
outlet to an NSImageView contained in a panel.)
The problem is that, although this *does* extract the rectangular region
between mouseDown (the upper-left corner) and mouseUp (the lower-right
corner) and displays it in the zoomImageView, it's extremely jagged...
Almost as if the PDF data is merely a PDF wrapper containing the screen
bitmap. What do I need to do in order to get the "real" PDF data so that I
can scale the region smoothly?
Thanks,
Jason
@implementation MyImageView
-(void)mouseDown:(NSEvent *)theEvent
{
downPoint = [self convertPoint: [theEvent locationInWindow] fromView:
nil];
}
-(void) mouseUp: (NSEvent *)theEvent
{
upPoint = [self convertPoint: [theEvent locationInWindow] fromView:
nil];
NSImage *img =
[[NSImage alloc] initWithData:
[self dataWithPDFInsideRect: NSMakeRect( downPoint.x, upPoint.y,
upPoint.x -
downPoint.x,
downPoint.y -
upPoint.y)]];
[zoomImageView setImage: img];
[img release];
[zoomPanel makeKeyAndOrderFront: self];
[zoomImageView setNeedsDisplay: YES];
}
@end
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