1 files changed, 84 insertions, 0 deletions
diff --git a/src/osx/CALayer+DrawLabel.m b/src/osx/CALayer+DrawLabel.m
new file mode 100644
index 0000000..4860a3c
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+++ b/src/osx/CALayer+DrawLabel.m
@@ -0,0 +1,84 @@
+//
+//  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