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//
// GTMLinearRGBShading.h
//
// Copyright 2006-2008 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy
// of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
//
#import <Cocoa/Cocoa.h>
#import "GTMShading.h"
#import "GTMCalculatedRange.h"
/// A shading that does returns smooth linear values for RGB.
//
/// Thus if you create a shading from 0.0->red to 1.0->blue you will get
/// \verbatim
/// - 0.5->purple
/// - 0.75->eggplant
/// - 0.25->magenta
/// \endverbatim
@interface GTMLinearRGBShading : GTMCalculatedRange <GTMShading> {
@private
CGFunctionRef function_; // function used to calculated shading (STRONG)
CGColorSpaceRef colorSpace_; // colorspace used for shading (STRONG)
BOOL isCalibrated_; // are we using calibrated or device RGB.
CGFloat colorValue_[4]; // the RGBA color values
}
/// Generate a shading with color |begin| at position 0.0 and color |end| at 1.0.
//
// Args:
// begin: color at beginning of range
// end: color at end of range
// colorSpaceName: name of colorspace to draw into must be either
// NSCalibratedRGBColorSpace or NSDeviceRGBColorSpace
//
// Returns:
// a GTMLinearRGBShading
+ (id)shadingFromColor:(NSColor *)begin toColor:(NSColor *)end
fromSpaceNamed:(NSString*)colorSpaceName;
/// Generate a shading with a collection of colors at various positions.
//
// Args:
// colors: a C style array containg the colors we are adding
// colorSpaceName: name of colorspace to draw into must be either
// NSCalibratedRGBColorSpace or NSDeviceRGBColorSpace
// positions: a C style array containg the positions we want to
// add the colors at
// numberOfColors: how many colors/positions we are adding
//
// Returns:
// a GTMLinearRGBShading
+ (id)shadingWithColors:(NSColor **)colors
fromSpaceNamed:(NSString*)colorSpaceName
atPositions:(CGFloat *)positions
count:(NSUInteger)numberOfColors;
/// Designated initializer
// Args:
// colorSpaceName - name of the colorspace to use must be either
// NSCalibratedRGBColorSpace or NSDeviceRGBColorSpace
- (id)initWithColorSpaceName:(NSString*)colorSpaceName;
@end
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