/*

     File: QuartzImages.m

 Abstract: Demonstrates using Quartz for drawing images (QuartzImageView), PDF files (QuartzPDFView), and text (QuartzTextView).

  Version: 3.0

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*/

#import "QuartzImages.h"

@implementation QuartzImageView

{

    CGImageRef _image;

}

-(void)drawInContext:(CGContextRef)context

{

    CGRect imageRect;

    imageRect.origin = CGPointMake(8.0, 8.0);

    imageRect.size = CGSizeMake(64.0, 64.0);

    // Note: The images are actually drawn upside down because Quartz image drawing expects

    // the coordinate system to have the origin in the lower-left corner, but a UIView

    // puts the origin in the upper-left corner. For the sake of brevity (and because

    // it likely would go unnoticed for the image used) this is not addressed here.

    // For the demonstration of PDF drawing however, it is addressed, as it would definately

    // be noticed, and one method of addressing it is shown there.

    // Draw the image in the upper left corner (0,0) with size 64x64

    CGContextDrawImage(context, imageRect, self.image);

    // Tile the same image across the bottom of the view

    // CGContextDrawTiledImage() will fill the entire clipping area with the image, so to avoid

    // filling the entire view, we'll clip the view to the rect below. This rect extends

    // past the region of the view, but since the view's rectangle has already been applied as a clip

    // to our drawing area, it will be intersected with this rect to form the final clipping area

    CGContextClipToRect(context, CGRectMake(0.0, 80.0, self.bounds.size.width, self.bounds.size.height));

    // The origin of the image rect works similarly to the phase parameter for SetLineDash and

    // SetPatternPhase and specifies where in the coordinate system the "first" image is drawn.

    // The size (previously set to 64x64) specifies the size the image is scaled to before being tiled.

    imageRect.origin = CGPointMake(32.0, 112.0);

    CGContextDrawTiledImage(context, imageRect, self.image);

    // Highlight the "first" image from the DrawTiledImage call.

    CGContextSetRGBFillColor(context, 1.0, 0.0, 0.0, 0.5);

    CGContextFillRect(context, imageRect);

    // And stroke the clipped area

    CGContextSetLineWidth(context, 3.0);

    CGContextSetRGBStrokeColor(context, 1.0, 0.0, 0.0, 1.0);

    CGContextStrokeRect(context, CGContextGetClipBoundingBox(context));

}

- (CGImageRef)image

{

    if (_image == NULL)

    {

        NSString *imagePath = [[NSBundle mainBundle] pathForResource:@"Demo" ofType:@"png"];

        UIImage *img = [UIImage imageWithContentsOfFile:imagePath];

        _image = CGImageRetain(img.CGImage);

    }

    return _image;

}

-(void)dealloc

{

    CGImageRelease(_image);

}

@end

#pragma mark -

@implementation QuartzPDFView

{

    CGPDFDocumentRef _pdfDocument;

}

-(void)drawInContext:(CGContextRef)context

{

    // PDF page drawing expects a Lower-Left coordinate system, so we flip the coordinate system

    // before we start drawing.

    CGContextTranslateCTM(context, 0.0, self.bounds.size.height);

    CGContextScaleCTM(context, 1.0, -1.0);

    // Grab the first PDF page

    CGPDFPageRef page = CGPDFDocumentGetPage(self.pdfDocument, 1);

    // We're about to modify the context CTM to draw the PDF page where we want it, so save the graphics state in case we want to do more drawing

    CGContextSaveGState(context);

    // CGPDFPageGetDrawingTransform provides an easy way to get the transform for a PDF page. It will scale down to fit, including any

    // base rotations necessary to display the PDF page correctly. 

    CGAffineTransform pdfTransform = CGPDFPageGetDrawingTransform(page, kCGPDFCropBox, self.bounds, 0, true);

    // And apply the transform.

    CGContextConcatCTM(context, pdfTransform);

    // Finally, we draw the page and restore the graphics state for further manipulations!

    CGContextDrawPDFPage(context, page);

    CGContextRestoreGState(context);

}

-(CGPDFDocumentRef)pdfDocument

{

    if (_pdfDocument == NULL)

    {

        CFURLRef pdfURL = CFBundleCopyResourceURL(CFBundleGetMainBundle(), CFSTR("Quartz.pdf"), NULL, NULL);

        _pdfDocument = CGPDFDocumentCreateWithURL((CFURLRef)pdfURL);

        CFRelease(pdfURL);

    }

    return _pdfDocument;

}

-(void)dealloc

{

    CGPDFDocumentRelease(_pdfDocument);

}

@end

#pragma mark -

@implementation QuartzTextView

#define kTextString "Hello From Quartz"

#define kTextStringLength strlen(kTextString)

-(void)drawInContext:(CGContextRef)context

{

    CGContextSetRGBFillColor(context, 1.0, 1.0, 1.0, 1.0);

    CGContextSetRGBStrokeColor(context, 1.0, 0.0, 0.0, 1.0);

    // Some initial setup for our text drawing needs.

    // First, we will be doing our drawing in Helvetica-36pt with the MacRoman encoding.

    // This is an 8-bit encoding that can reference standard ASCII characters

    // and many common characters used in the Americas and Western Europe.

    CGContextSelectFont(context, "Helvetica", 36.0, kCGEncodingMacRoman);

    // Next we set the text matrix to flip our text upside down. We do this because the context itself

    // is flipped upside down relative to the expected orientation for drawing text (much like the case for drawing Images & PDF).

    CGContextSetTextMatrix(context, CGAffineTransformMakeScale(1.0, -1.0));

    // And now we actually draw some text. This screen will demonstrate the typical drawing modes used.

    CGContextSetTextDrawingMode(context, kCGTextFill);

    CGContextShowTextAtPoint(context, 10.0, 30.0, kTextString, kTextStringLength);

    CGContextSetTextDrawingMode(context, kCGTextStroke);

    CGContextShowTextAtPoint(context, 10.0, 70.0, kTextString, kTextStringLength);

    CGContextSetTextDrawingMode(context, kCGTextFillStroke);

    CGContextShowTextAtPoint(context, 10.0, 110.0, kTextString, kTextStringLength);

    // Now lets try the more complex Glyph functions. These functions allow you to draw any glyph available in a font,

    // but provide no assistance with converting characters to glyphs or layout, and as such require considerably more knowledge

    // of text to use correctly. Specifically, you need to understand Unicode encoding and how to interpret the information

    // present in the font itself, such as the cmap table.

    // To get you started, we are going to do the minimum necessary to draw a glyphs into the current context.

    CGFontRef helvetica = CGFontCreateWithFontName((CFStringRef)@"Helvetica");

    CGContextSetFont(context, helvetica);

    CGContextSetFontSize(context, 12.0);

    CGContextSetTextDrawingMode(context, kCGTextFill);

    // Next we'll display lots of glyphs from the font. 

    CGGlyph start = 0;

    for(int y = 0; y < 20; ++y)

    {

        CGGlyph glyphs[32];

        for(int i = 0; i < 32; ++i)

        {

            glyphs[i] = start + i;

        }

        start += 32;

        CGContextShowGlyphsAtPoint(context, 10.0, 150.0 + 12 * y, glyphs, 32);

    }

    CGFontRelease(helvetica);

}

@end