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//
// CALayer+DrawLabel.m
// TikZiT
//
// Created by Aleks Kissinger on 09/05/2011.
// Copyright 2011 Aleks Kissinger. All rights reserved.
//
#import "CALayer+DrawLabel.h"
#import "Transformer.h"
@implementation CALayer(DrawLabel)
- (void)drawLabel:(NSString*)label
atPoint:(NSPoint)pt
inContext:(CGContextRef)context
usingTrans:(Transformer*)t {
CGContextSaveGState(context);
if ([label length] > 15) {
label = [[label substringToIndex:12] stringByAppendingString:@"..."];
}
float fontSize = [t scaleToScreen:0.18f]; // size 9 @ 100%
if (fontSize > 18.0f) fontSize = 18.0f;
// Prepare font
CTFontRef font = CTFontCreateWithName(CFSTR("Monaco"), fontSize, NULL);
// Create an attributed string
CFStringRef keys[] = { kCTFontAttributeName };
CFTypeRef values[] = { font };
CFDictionaryRef attr = CFDictionaryCreate(NULL,
(const void **)&keys,
(const void **)&values,
sizeof(keys) / sizeof(keys[0]),
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
CFAttributedStringRef attrString =
CFAttributedStringCreate(NULL, (CFStringRef)label, attr);
CFRelease(attr);
// Draw the string
CTLineRef line = CTLineCreateWithAttributedString(attrString);
CGContextSetTextMatrix(context, CGAffineTransformIdentity);
CGContextSetTextPosition(context, 0, 0);
CGRect labelBounds = CGRectIntegral(CTLineGetImageBounds(line, context));
//int shiftx = round(labelBounds.size.width / 2);
CGContextSetTextPosition(context,
round(pt.x - (labelBounds.size.width/2)),
round(pt.y - (0.9*labelBounds.size.height/2)));
labelBounds = CGRectIntegral(CTLineGetImageBounds(line, context));
labelBounds.origin.x -= 2;
labelBounds.origin.y -= 2;
labelBounds.size.width += 4;
labelBounds.size.height += 4;
CGContextSetShouldAntialias(context, NO);
CGContextSetRGBFillColor(context, 1.0f, 1.0f, 0.5f, 0.7f);
CGContextSetRGBStrokeColor(context, 0.5f, 0.0f, 0.0f, 0.7f);
CGContextFillRect(context, labelBounds);
CGContextStrokeRect(context, labelBounds);
CGContextSetShouldAntialias(context, YES);
CGContextSetRGBFillColor(context, 0.3f, 0.3f, 0.3f, 0.7f);
CTLineDraw(line, context);
// Clean up
CFRelease(line);
CFRelease(attrString);
CFRelease(font);
CGContextRestoreGState(context);
}
@end
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