UIColor-RGBA.mm

/* $NoKeywords: $ */
/*
 //
 // Copyright (c) 1993-2011 Robert McNeel & Associates. All rights reserved.
 // Portions Copyright (C) 2009 Apple Inc. All Rights Reserved.
 // Rhinoceros is a registered trademark of Robert McNeel & Assoicates.
 //
 // THIS SOFTWARE IS PROVIDED "AS IS" WITHOUT EXPRESS OR IMPLIED WARRANTY.
 // ALL IMPLIED WARRANTIES OF FITNESS FOR ANY PARTICULAR PURPOSE AND OF
 // MERCHANTABILITY ARE HEREBY DISCLAIMED.
 //				
 // For complete openNURBS copyright information see <http://www.opennurbs.org>.
 //
 ////////////////////////////////////////////////////////////////
 */

#import "UIColor-RGBA.h"


@implementation UIColor (RGBA)


- (CGColorSpaceModel) colorSpaceModel
{
	return CGColorSpaceGetModel(CGColorGetColorSpace(self.CGColor));
}

- (NSString *) colorSpaceString
{
	switch ([self colorSpaceModel])
	{
		case kCGColorSpaceModelUnknown:
			return @"kCGColorSpaceModelUnknown";
		case kCGColorSpaceModelMonochrome:
			return @"kCGColorSpaceModelMonochrome";
		case kCGColorSpaceModelRGB:
			return @"kCGColorSpaceModelRGB";
		case kCGColorSpaceModelCMYK:
			return @"kCGColorSpaceModelCMYK";
		case kCGColorSpaceModelLab:
			return @"kCGColorSpaceModelLab";
		case kCGColorSpaceModelDeviceN:
			return @"kCGColorSpaceModelDeviceN";
		case kCGColorSpaceModelIndexed:
			return @"kCGColorSpaceModelIndexed";
		case kCGColorSpaceModelPattern:
			return @"kCGColorSpaceModelPattern";
		default:
			return @"Not a valid color space";
	}
}

- (BOOL) canProvideRGBComponents
{
	return (([self colorSpaceModel] == kCGColorSpaceModelRGB) || 
          ([self colorSpaceModel] == kCGColorSpaceModelMonochrome));
}

- (CGFloat) red
{
	NSAssert (self.canProvideRGBComponents, @"Must be a RGB color to use -red, -green, -blue");
	const CGFloat *c = CGColorGetComponents(self.CGColor);
	return c[0];
}

- (CGFloat) green
{
	NSAssert (self.canProvideRGBComponents, @"Must be a RGB color to use -red, -green, -blue");
	const CGFloat *c = CGColorGetComponents(self.CGColor);
	if ([self colorSpaceModel] == kCGColorSpaceModelMonochrome) return c[0];
	return c[1];
}

- (CGFloat) blue
{
	NSAssert (self.canProvideRGBComponents, @"Must be a RGB color to use -red, -green, -blue");
	const CGFloat *c = CGColorGetComponents(self.CGColor);
	if ([self colorSpaceModel] == kCGColorSpaceModelMonochrome) return c[0];
	return c[2];
}

- (CGFloat) alpha
{
	const CGFloat *c = CGColorGetComponents(self.CGColor);
	return c[CGColorGetNumberOfComponents(self.CGColor)-1];
}

@end