Hi,
I'm stuck on a problem on how to print high resolution graphs on Mac OS X, by
using the wonderful CorePlot (1) framework.
I've asked on the Coreplot mailing list but no answer...maybe it's too obvious
that I don't see the tree in the forest:
My method produces a CGContextRef (with CGPDFContextCreate) which then writes
the drawing / plotting as a PDF.
This works great: The written PDF file doesn't have any jaggies since it is
vector based.
However if I want print the graphs via the Printer Panel, I need first to
create a bitmap-based NSImageView as far as I understand,
so the prints never seem to be vector based, there will always be jaggies in
the plots and text.
Resizing-up the whole image could be a solution, but I don't think this is the
best one.
So is it possible to print directly a PDF based CGContextRef ?
Here's my IBAction to create the PDF:
-(IBAction)exportActiveGraphsToPDF:(id)sender
NSSavePanel *pdfSavingDialog = [NSSavePanel savePanel];
[pdfSavingDialog setMessage:@"Export as PDF"];
NSArray *pdfType = [[NSArray alloc] initWithObjects:@"pdf", nil];
[pdfSavingDialog setAllowedFileTypes:pdfType];
[pdfType release];
if ( [pdfSavingDialog runModal] == NSOKButton ) {
NSMutableData *pdfData = [[NSMutableData alloc] init];
CGDataConsumerRef dataConsumer =
CGDataConsumerCreateWithCFData((CFMutableDataRef)pdfData);
CGRect pdfMediaBox = NSRectToCGRect([allGraphsView bounds]);
CGContextRef pdfContext = CGPDFContextCreate(dataConsumer, &pdfMediaBox,
NULL);
CGContextBeginPage(pdfContext, &pdfMediaBox);
// call renderGraphsInContext to draw the coreplot graphs in the given
CGContextRef
[self renderGraphsInContext:pdfContext];
CGContextEndPage(pdfContext);
CGPDFContextClose(pdfContext);
[pdfData writeToURL:[pdfSavingDialog URL] atomically:NO];
CGContextRelease(pdfContext);
CGDataConsumerRelease(dataConsumer);
[pdfData release];
}
}
(1)
http://code.google.com/p/core-plot/
Any help is greatly appreciated.
Cheers,
Gilles
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