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Re: Printing with CGContexts

Subject: Re: Printing with CGContexts
From: Scott Thompson <email@hidden>
Date: Mon, 30 Jan 2006 08:40:23 -0600
Delivered-to: email@hidden
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On Jan 27, 2006, at 1:12 PM, Eric Gorr wrote:

I've including my printing code at the end of this message. The end result is a blank page.
page&paper bounds looks fine as does destinationRect.
Any idea what might be going on?

CGContextBeginPage and CGContextEndPage are for generating PDFs. I might even argue that they should not be in the abstract CGContextAPI. However they shouldn't affect your drawing.

CGContextSetAntialias is likely to be a no-op for a printer context. Antialiasing only makes sense for bitmap contexts but most printers go through a high-resolution PDF rasterization path where antialiasing doesn't apply.

You never set a stroke color or line width... you might try setting those things explicitly.

It's been a while since I worked with Carbon printing. I have this tickle at the back of my brain which says you don't want to be working with the adjusted page rects. I believe the "adjustment" is already incorporated into the CGContext's transform as is the paper to page transformation. A lot of your code appears to be directed toward adding this transformation.

I would try removing the CTM transform and see if you get a mark on the page.

graphicsContexts = CFArrayCreate( NULL, (const void **) &contextType, 1, &kCFTypeArrayCallBacks );

stErr = PMSessionSetDocumentFormatGeneration( printSession, kPMDocumentFormatDefault, graphicsContexts, NULL ); stErr = PMSessionBeginDocument( printSession, printSettings, pageFormat ); stErr = PMSessionBeginPage( printSession, pageFormat, NULL ); stErr = PMSessionGetGraphicsContext( printSession, kPMGraphicsContextCoreGraphics, (void**)&printingContext );
    PMRect  pageBounds, paperBounds;
    PMGetAdjustedPageRect( pageFormat, &pageBounds );
    float carbonPageWidth   = pageBounds.right - pageBounds.left;
    float carbonPageHeight  = pageBounds.bottom - pageBounds.top;
    PMGetAdjustedPaperRect( pageFormat, &paperBounds );
    float carbonPaperWidth  = paperBounds.right - paperBounds.left;
    float carbonPaperHeight = paperBounds.bottom - paperBounds.top;
    CGRect destinationRect;
    destinationRect.size.height = carbonPageHeight;
    destinationRect.size.width  = carbonPageWidth;
    destinationRect.origin.x    = pageBounds.left;
    destinationRect.origin.y    = pageBounds.top;
double paperToPageYOffset = carbonPaperHeight + paperBounds.top - carbonPageHeight; double xOffset = -paperBounds.left;
    CGContextBeginPage( printingContext, &destinationRect );
CGContextTranslateCTM( printingContext, xOffset, paperToPageYOffset ); CGContextSetShouldAntialias( printingContext, false );
      CGContextBeginPath( printingContext );
      CGContextMoveToPoint( printingContext, 10, 10 );
      CGContextAddLineToPoint( printingContext, 20, 20 );
      CGContextStrokePath( printingContext );
    CGContextEndPage( printingContext );
stErr = PMSessionEndPage( printSession );
stErr = PMSessionEndDocument( printSession );
stErr = PMSessionError( printSession );
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References:
	>Printing with CGContexts (From: Eric Gorr <email@hidden>)

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