Would Like to Take several SVGs and Tile or otherwise Lay them out into a PDF.

[grhowes]

@allen8300 requested in an unrelated issue for the following (as I understand the request)

If you look at the source for the SVGtoPDFConverter you can see it is limited to one svgs and one page.

@implementation SVGtoPDFConverter
+(void) createPDFFromRenderer:(SVGRenderer*)aRenderer intoCallback:(renderPDFCallback_t)callback
{
    [[SVGRenderer rendererQueue] addOperationWithBlock:^{
        CGRect boundingBox = aRenderer.viewRect;
        NSData* theResult = nil;
        CFMutableDataRef pdfData = CFDataCreateMutable(NULL, 0);
        if(pdfData != 0)
        {
            CGContextRef quartzContext = CreatePDFContext(boundingBox, pdfData);
            CGContextBeginPage(quartzContext, &boundingBox);
            CGContextSaveGState(quartzContext);

            CGContextTranslateCTM(quartzContext, 0, boundingBox.size.height);
            CGContextScaleCTM(quartzContext, 1.0, -1.0);
            [aRenderer renderIntoContext:quartzContext];

            CGContextEndPage(quartzContext);
            CGContextRestoreGState(quartzContext);
            CGContextFlush(quartzContext);

            CGContextRelease(quartzContext);
            theResult = [(__bridge NSMutableData*)pdfData copy];
            CFRelease(pdfData);
        }
        callback(theResult);
    }];
}
@end

A user has requested a method to generate a tiling version of a PDF. Demo-2.pdf

[grhowes]

@allen8300 Well, I think what you'll have to do is take the above code as a template, and generate however many SVGRenderers as you have different SVGs, and loop over them inside the calls above to CGContextBeginPage and CGContextEndPage, translating and scaling as appropriate. You should probably also take care to clip to the bounding rectangle for each SVG. This isn't something general purpose I'm inclined to add to this library, but it should be easily doable.

[grhowes]

The following appears to work after I cleaned it up a bit. Some things you weren't taking into account:

• An SVG has a default viewRect which you will have to scale appropriately.
• You weren't using the render you were passing in.
• Locate the artwork using the bundle instead of an object if you don't have an object
• I made use of save restore so as to consistently place the object using translate.
• The graphic context was upside down when it came from CreatePDFContext so I had to use the trick of going to the bottom and flipping the y scale.

+(void) createPDFFromRenderer:(SVGRenderer*)aRenderer intoCallback:(renderPDFCallback_t)callback { [[SVGRenderer rendererQueue] addOperationWithBlock:^{

    const CGFloat   maxDimension = 1000.0;
    const CGFloat cellWidth = 50.0f;
    const CGFloat cellHeight = 50.0f;
    CGRect nativeRect = aRenderer.viewRect;
    CGRect boundingBox =CGRectMake(0, 0, maxDimension, maxDimension);

    NSData* theResult = nil;
    CFMutableDataRef pdfData = CFDataCreateMutable(NULL, 0);
    if(pdfData != 0)
    {
        CGContextRef quartzContext = CreatePDFContext(boundingBox, pdfData);
        CGContextBeginPage(quartzContext, &boundingBox);
        CGContextSaveGState(quartzContext);
        CGContextTranslateCTM(quartzContext, 0, maxDimension);
        CGContextScaleCTM(quartzContext, 1.0, -1.0);
        CGFloat originX = 0.0;
        CGFloat originY = 0.0;
        while(originY < maxDimension)
        {
            while(originX < maxDimension) {
                CGRect newboundingBox = CGRectMake(originX, originY, cellWidth, cellHeight);
                CGContextSaveGState(quartzContext);
                //CGContextClipToRect(quartzContext, newboundingBox);

                CGContextTranslateCTM(quartzContext, newboundingBox.origin.x, originY);

                CGContextScaleCTM(quartzContext, cellWidth/nativeRect.size.width,cellHeight/ nativeRect.size.height);

                [aRenderer renderIntoContext:quartzContext];
                CGContextRestoreGState(quartzContext);
                originX += cellWidth;
            }
            originX = 0.0;
            originY += cellHeight;
        }
        CGContextEndPage(quartzContext);
        CGContextRestoreGState(quartzContext);
        CGContextFlush(quartzContext);
        CGContextRelease(quartzContext);
        theResult = [(__bridge NSMutableData*)pdfData copy];
        CFRelease(pdfData);
    }
    callback(theResult);
}];

}

+(void) drawHeartMatrixIntoCallback:(renderPDFCallback_t)callback { NSURL* myNewArtwork = [GHControlFactory locateArtworkForBundle:nil atSubpath:@"Artwork/heart"]; SVGRenderer* aRenderer = [[SVGRenderer alloc] initWithContentsOfURL:myNewArtwork]; [self createPDFFromRenderer:aRenderer intoCallback:callback]; }