Some ramblings and cut-outs from wwdc presentation on CoreText

core-text-snippet1.m

#import <Foundation/Foundation.h>
#import <ApplicationServices/ApplicationServices.h>

CTFontRef font = CTFontCreateWithName(CFSTR("LucidaGrande"), 11.0, NULL);

CFTypeRef keys[] = { kCTFontAttributeName };
CFTypeRef values[] = { font };
CFDictionaryRef attributes =
    CFDictionaryCreate(kCFAllocatorDefault,
                       (const void**)keys,
                       (const void**)values,
                       sizeof(keys) / sizeof(keys[0]), // CFIndex numValues 
                       &kCFTypeDictionaryKeyCallBacks, 
                       &kCFTypeDictionaryValueCallBacks);

CFAttributedStringRef attributedString =
    CFAttributedStringCreate(kCFAllocatorDefault,
                             CFSTR("Hello internet"),
                             attributes);

// ---------
// Drawing a simple line

CTLineRef line = CTLineCreateWithAttributedString(attributedString);
CGContextRef g = NULL; // TODO
CGContextSetTextMatrix(g, CGAffineTransformIdentity);
// todo: determine text position, perhaps by measuring line
CGContextSetTextPosition(g, 123.0, 456.0);
CTLineDraw(line, g);

// --------
// Drawing a frame (simple paragraph)

CGMutablePathRef path = CGPathCreateMutable();
CGPathAddRect(path, CGAffineTransformIdentity,
              CGRectMake(0.0, 0.0, 100.0, 100.0));

CTFramesetterRef framesetter =
    CTFramesetterCreateWithAttributedString(attributedString);
CTFrameRef frame = CTFramesetterCreateFrame(framesetter, CFRangeMake(0,0),
                                            path, NULL);                                            
CTFrameDraw(frame, g);