code from nickshanks to generate the progress bars without images, also makes the bars resolution independent

macosx/CTGradient/CTGradient.h

@@ -0,0 +1,74 @@
+//
+//  CTGradient.h
+//
+//  Created by Chad Weider on 2/14/07.
+//  Copyright (c) 2007 Chad Weider.
+//  Some rights reserved: <http://creativecommons.org/licenses/by/2.5/>
+//
+//  Version: 1.6
+
+#import <Cocoa/Cocoa.h>
+
+typedef struct _CTGradientElement 
+	{
+	float red, green, blue, alpha;
+	float position;
+	
+	struct _CTGradientElement *nextElement;
+	} CTGradientElement;
+
+typedef enum  _CTBlendingMode
+	{
+	CTLinearBlendingMode,
+	CTChromaticBlendingMode,
+	CTInverseChromaticBlendingMode
+	} CTGradientBlendingMode;
+
+
+@interface CTGradient : NSObject <NSCopying, NSCoding>
+	{
+	CTGradientElement* elementList;
+	CTGradientBlendingMode blendingMode;
+	
+	CGFunctionRef gradientFunction;
+	}
+
++ (id)gradientWithBeginningColor:(NSColor *)begin endingColor:(NSColor *)end;
+
++ (id)aquaSelectedGradient;
++ (id)aquaNormalGradient;
++ (id)aquaPressedGradient;
+
++ (id)unifiedSelectedGradient;
++ (id)unifiedNormalGradient;
++ (id)unifiedPressedGradient;
++ (id)unifiedDarkGradient;
+
++ (id)sourceListSelectedGradient;
++ (id)sourceListUnselectedGradient;
+
++ (id)rainbowGradient;
++ (id)hydrogenSpectrumGradient;
+
+- (CTGradient *)gradientWithAlphaComponent:(float)alpha;
+
+- (void)addElement:(CTGradientElement*)newElement;
+
+- (CTGradient *)addColorStop:(NSColor *)color atPosition:(float)position;	//positions given relative to [0,1]
+- (CTGradient *)removeColorStopAtIndex:(unsigned)index;
+- (CTGradient *)removeColorStopAtPosition:(float)position;
+
+- (CTGradientBlendingMode)blendingMode;
+- (NSColor *)colorStopAtIndex:(unsigned)index;
+- (NSColor *)colorAtPosition:(float)position;
+
+
+- (void)drawSwatchInRect:(NSRect)rect;
+- (void)fillRect:(NSRect)rect angle:(float)angle;					//fills rect with axial gradient
+																	//	angle in degrees
+- (void)radialFillRect:(NSRect)rect;								//fills rect with radial gradient
+																	//  gradient from center outwards
+- (void)fillBezierPath:(NSBezierPath *)path angle:(float)angle;
+- (void)radialFillBezierPath:(NSBezierPath *)path;
+
+@end