Hi,
I'm trying to print a really large image into 'N' pages. So I over-rode
'knowsPageRange' and 'rectForPage'. Since I was able to successfully draw on
a single page, my rectForPage function returns the entire 'print view frame'
itself, and I draw a sub-image in this frame. My understanding is that
rectForPage simply returns an NSRect in the print view to which all drawing
operations are clipped. So I don't want to clip anything, but I do it myself
by creating a sub-image (using CGImageCreateWithImageInRect) and drawing it
like any other image on the entire view. But this doesn't seem to work, I'm
getting just a single line on my 2nd page, and from my 3rd page onwards I
don't get any output. My first page appears fine. What could be wrong? Here
is the basic skeleton of the code I'm using:
// BEGIN CODE
void OnPrint()
{
PrintView *printView = [[PrintView alloc] initWithFrame:printViewFrame];
NSPrintOperation *printOp = [NSPrintOperation
printOperationWithView:printView];
[printOp runOperation];
}
Class print view functions over-ridden:
- (BOOL) knowsPageRange: (NSRangePointer) aRange
{
aRange->location = 1;
aRange->length = totalPages;
return YES;
}
- (NSRect) rectForPage: (int) page
{
mCurrentPage = page;
return [self frame];
}
- (void) drawRect: (NSRect) rect
{
// assume a CGImageRef 'sourceImage', its width and height as
'imageWidth' and 'imageHeight'
CGRect imageRect = {{0, imageHeight*((float)(numPages-1)/totalPages)},
{imageWidth, imageHeight / totalPages} };
CGImageRef subImage = CGImageCreateWithImageInRect(sourceImage,
imageRect);
NSGraphicsContext *currentContext = [NSGraphicsContext currentContext];
CGContextRef context = (CGContext*)[currentContext graphicsPort];
CGContextDrawImage(context, imageRect, subImage);
}
// END CODE
Thanks,
Renzil
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