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CPTGradient.m
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1672 lines (1324 loc) · 53.3 KB
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#import "CPTGradient.h"
#import "CPTColor.h"
#import "CPTColorSpace.h"
#import "CPTPlatformSpecificFunctions.h"
#import "CPTUtilities.h"
#import "NSCoderExtensions.h"
#import <tgmath.h>
/// @cond
@interface CPTGradient()
@property (nonatomic, readwrite, strong, nonnull) CPTColorSpace *colorspace;
@property (nonatomic, readwrite, assign) CPTGradientBlendingMode blendingMode;
@property (nonatomic, readwrite, assign) CPTGradientElement *elementList;
@property (nonatomic, readwrite, assign, nonnull) CGFunctionRef gradientFunction;
-(void)commonInit;
-(void)addElement:(nonnull CPTGradientElement *)newElement;
-(nonnull CGShadingRef)newAxialGradientInRect:(CGRect)rect;
-(nonnull CGShadingRef)newRadialGradientInRect:(CGRect)rect context:(nonnull CGContextRef)context;
-(nullable CPTGradientElement *)elementAtIndex:(NSUInteger)idx NS_RETURNS_INNER_POINTER;
-(NSUInteger)elementCount;
-(CPTGradientElement)removeElementAtIndex:(NSUInteger)idx;
-(CPTGradientElement)removeElementAtPosition:(CGFloat)position;
-(void)removeAllElements;
@end
// C Functions for color blending
static void CPTLinearEvaluation(void *__nullable info, const CGFloat *__nonnull in, CGFloat *__nonnull out);
static void CPTChromaticEvaluation(void *__nullable info, const CGFloat *__nonnull in, CGFloat *__nonnull out);
static void CPTInverseChromaticEvaluation(void *__nullable info, const CGFloat *__nonnull in, CGFloat *__nonnull out);
static void CPTTransformRGB_HSV(CGFloat *__nonnull components);
static void CPTTransformHSV_RGB(CGFloat *__nonnull components);
static void CPTResolveHSV(CGFloat *__nonnull color1, CGFloat *__nonnull color2);
/// @endcond
#pragma mark -
/** @brief Draws color gradient fills.
*
* Gradients consist of multiple colors blended smoothly from one to the next at
* specified positions using one of three blending modes. The color positions are
* defined in a range between zero (@num{0}) and one (@num{1}). Axial gradients are drawn with
* color positions increasing from left to right when the angle property is zero (@num{0}).
* Radial gradients are drawn centered in the provided drawing region with position zero (@num{0})
* in the center and one (@num{1}) at the outer edge.
*
* @note Based on @par{CTGradient} (http://blog.oofn.net/2006/01/15/gradients-in-cocoa/).
* @par{CTGradient} is in the public domain (Thanks Chad Weider!).
**/
@implementation CPTGradient
/// @cond
/** @property nonnull CPTColorSpace *colorspace;
* @brief The colorspace for the gradient colors.
**/
@synthesize colorspace;
/// @endcond
/** @property CPTGradientBlendingMode blendingMode
* @brief The color blending mode used to create the gradient.
**/
@synthesize blendingMode;
/** @property CGFloat angle
* @brief The axis angle of an axial gradient, expressed in degrees and measured counterclockwise from the positive x-axis.
**/
@synthesize angle;
/** @property CPTGradientType gradientType
* @brief The gradient type.
**/
@synthesize gradientType;
/** @property CGPoint startAnchor
* @brief The anchor point for starting point of a radial gradient. Defaults to (@num{0.5}, @num{0.5}) which centers the gradient on the drawing rectangle.
**/
@synthesize startAnchor;
/** @property CGPoint endAnchor
* @brief The anchor point for ending point of a radial gradient. Defaults to (@num{0.5}, @num{0.5}) which centers the gradient on the drawing rectangle.
**/
@synthesize endAnchor;
/** @property BOOL opaque
* @brief If @YES, the gradient is completely opaque.
*/
@dynamic opaque;
@synthesize elementList;
@synthesize gradientFunction;
#pragma mark -
#pragma mark Init/Dealloc
/// @name Initialization
/// @{
/** @brief Initializes a newly allocated CPTGradient object.
*
* The initialized object will have the following properties:
* - @ref blendingMode = #CPTLinearBlendingMode
* - @ref angle = @num{0.0}
* - @ref gradientType = #CPTGradientTypeAxial
* - @ref startAnchor = (@num{0.5}, @num{0.5})
* - @ref endAnchor = (@num{0.5}, @num{0.5})
*
* @return The initialized object.
**/
-(nonnull instancetype)init
{
if ((self = [super init])) {
[self commonInit];
self.blendingMode = CPTLinearBlendingMode;
angle = CPTFloat(0.0);
gradientType = CPTGradientTypeAxial;
startAnchor = CPTPointMake(0.5, 0.5);
endAnchor = CPTPointMake(0.5, 0.5);
}
return self;
}
/// @}
/// @cond
-(void)commonInit
{
self.colorspace = [CPTColorSpace genericRGBSpace];
self.elementList = NULL;
}
-(void)dealloc
{
CGFunctionRelease(gradientFunction);
[self removeAllElements];
}
/// @endcond
#pragma mark -
#pragma mark NSCopying Methods
/// @cond
-(nonnull id)copyWithZone:(nullable NSZone *)zone
{
CPTGradient *copy = [[[self class] allocWithZone:zone] init];
CPTGradientElement *currentElement = self.elementList;
while ( currentElement != NULL ) {
[copy addElement:currentElement];
currentElement = currentElement->nextElement;
}
copy.blendingMode = self.blendingMode;
copy.angle = self.angle;
copy.gradientType = self.gradientType;
copy.startAnchor = self.startAnchor;
copy.endAnchor = self.endAnchor;
return copy;
}
/// @endcond
#pragma mark -
#pragma mark NSCoding Methods
/// @cond
-(void)encodeWithCoder:(nonnull NSCoder *)coder
{
NSUInteger count = 0;
CPTGradientElement *currentElement = self.elementList;
while ( currentElement != NULL ) {
[coder encodeCGFloat:currentElement->color.red forKey:[NSString stringWithFormat:@"red%lu", (unsigned long)count]];
[coder encodeCGFloat:currentElement->color.green forKey:[NSString stringWithFormat:@"green%lu", (unsigned long)count]];
[coder encodeCGFloat:currentElement->color.blue forKey:[NSString stringWithFormat:@"blue%lu", (unsigned long)count]];
[coder encodeCGFloat:currentElement->color.alpha forKey:[NSString stringWithFormat:@"alpha%lu", (unsigned long)count]];
[coder encodeCGFloat:currentElement->position forKey:[NSString stringWithFormat:@"position%lu", (unsigned long)count]];
count++;
currentElement = currentElement->nextElement;
}
[coder encodeInteger:(NSInteger)count forKey:@"CPTGradient.elementCount"];
[coder encodeInteger:self.blendingMode forKey:@"CPTGradient.blendingMode"];
[coder encodeCGFloat:self.angle forKey:@"CPTGradient.angle"];
[coder encodeInteger:self.gradientType forKey:@"CPTGradient.type"];
[coder encodeCPTPoint:self.startAnchor forKey:@"CPTPlotSymbol.startAnchor"];
[coder encodeCPTPoint:self.endAnchor forKey:@"CPTPlotSymbol.endAnchor"];
}
-(nullable instancetype)initWithCoder:(nonnull NSCoder *)coder
{
if ((self = [super init])) {
[self commonInit];
gradientType = (CPTGradientType)[coder decodeIntegerForKey:@"CPTGradient.type"];
angle = [coder decodeCGFloatForKey:@"CPTGradient.angle"];
self.blendingMode = (CPTGradientBlendingMode)[coder decodeIntegerForKey:@"CPTGradient.blendingMode"];
startAnchor = [coder decodeCPTPointForKey:@"CPTPlotSymbol.startAnchor"];
endAnchor = [coder decodeCPTPointForKey:@"CPTPlotSymbol.endAnchor"];
NSUInteger count = (NSUInteger)[coder decodeIntegerForKey:@"CPTGradient.elementCount"];
for ( NSUInteger i = 0; i < count; i++ ) {
CPTGradientElement newElement;
newElement.color.red = [coder decodeCGFloatForKey:[NSString stringWithFormat:@"red%lu", (unsigned long)i]];
newElement.color.green = [coder decodeCGFloatForKey:[NSString stringWithFormat:@"green%lu", (unsigned long)i]];
newElement.color.blue = [coder decodeCGFloatForKey:[NSString stringWithFormat:@"blue%lu", (unsigned long)i]];
newElement.color.alpha = [coder decodeCGFloatForKey:[NSString stringWithFormat:@"alpha%lu", (unsigned long)i]];
newElement.position = [coder decodeCGFloatForKey:[NSString stringWithFormat:@"position%lu", (unsigned long)i]];
[self addElement:&newElement];
}
}
return self;
}
/// @endcond
#pragma mark -
#pragma mark NSSecureCoding Methods
/// @cond
+(BOOL)supportsSecureCoding
{
return YES;
}
/// @endcond
#pragma mark -
#pragma mark Factory Methods
/** @brief Creates and returns a new CPTGradient instance initialized with an axial linear gradient between two given colors.
* @param begin The beginning color.
* @param end The ending color.
* @return A new CPTGradient instance initialized with an axial linear gradient between the two given colors.
**/
+(nonnull instancetype)gradientWithBeginningColor:(nonnull CPTColor *)begin endingColor:(nonnull CPTColor *)end
{
return [self gradientWithBeginningColor:begin endingColor:end beginningPosition:CPTFloat(0.0) endingPosition:CPTFloat(1.0)];
}
/** @brief Creates and returns a new CPTGradient instance initialized with an axial linear gradient between two given colors, at two given normalized positions.
* @param begin The beginning color.
* @param end The ending color.
* @param beginningPosition The beginning position (@num{0} ≤ @par{beginningPosition} ≤ @num{1}).
* @param endingPosition The ending position (@num{0} ≤ @par{endingPosition} ≤ @num{1}).
* @return A new CPTGradient instance initialized with an axial linear gradient between the two given colors, at two given normalized positions.
**/
+(nonnull instancetype)gradientWithBeginningColor:(nonnull CPTColor *)begin endingColor:(nonnull CPTColor *)end beginningPosition:(CGFloat)beginningPosition endingPosition:(CGFloat)endingPosition
{
CPTGradient *newInstance = [[self alloc] init];
CPTGradientElement color1;
CPTGradientElement color2;
color1.color = CPTRGBAColorFromCGColor(begin.cgColor);
color2.color = CPTRGBAColorFromCGColor(end.cgColor);
color1.position = beginningPosition;
color2.position = endingPosition;
[newInstance addElement:&color1];
[newInstance addElement:&color2];
return newInstance;
}
/** @brief Creates and returns a new CPTGradient instance initialized with the Aqua selected gradient.
* @return A new CPTGradient instance initialized with the Aqua selected gradient.
**/
+(nonnull instancetype)aquaSelectedGradient
{
CPTGradient *newInstance = [[self alloc] init];
CPTGradientElement color1;
color1.color.red = CPTFloat(0.58);
color1.color.green = CPTFloat(0.86);
color1.color.blue = CPTFloat(0.98);
color1.color.alpha = CPTFloat(1.00);
color1.position = CPTFloat(0.0);
CPTGradientElement color2;
color2.color.red = CPTFloat(0.42);
color2.color.green = CPTFloat(0.68);
color2.color.blue = CPTFloat(0.90);
color2.color.alpha = CPTFloat(1.00);
color2.position = CPTFloat(0.5);
CPTGradientElement color3;
color3.color.red = CPTFloat(0.64);
color3.color.green = CPTFloat(0.80);
color3.color.blue = CPTFloat(0.94);
color3.color.alpha = CPTFloat(1.00);
color3.position = CPTFloat(0.5);
CPTGradientElement color4;
color4.color.red = CPTFloat(0.56);
color4.color.green = CPTFloat(0.70);
color4.color.blue = CPTFloat(0.90);
color4.color.alpha = CPTFloat(1.00);
color4.position = CPTFloat(1.0);
[newInstance addElement:&color1];
[newInstance addElement:&color2];
[newInstance addElement:&color3];
[newInstance addElement:&color4];
return newInstance;
}
/** @brief Creates and returns a new CPTGradient instance initialized with the Aqua normal gradient.
* @return A new CPTGradient instance initialized with the Aqua normal gradient.
**/
+(nonnull instancetype)aquaNormalGradient
{
CPTGradient *newInstance = [[self alloc] init];
CPTGradientElement color1;
color1.color.red = color1.color.green = color1.color.blue = CPTFloat(0.95);
color1.color.alpha = CPTFloat(1.00);
color1.position = CPTFloat(0.0);
CPTGradientElement color2;
color2.color.red = color2.color.green = color2.color.blue = CPTFloat(0.83);
color2.color.alpha = CPTFloat(1.00);
color2.position = CPTFloat(0.5);
CPTGradientElement color3;
color3.color.red = color3.color.green = color3.color.blue = CPTFloat(0.95);
color3.color.alpha = CPTFloat(1.00);
color3.position = CPTFloat(0.5);
CPTGradientElement color4;
color4.color.red = color4.color.green = color4.color.blue = CPTFloat(0.92);
color4.color.alpha = CPTFloat(1.00);
color4.position = CPTFloat(1.0);
[newInstance addElement:&color1];
[newInstance addElement:&color2];
[newInstance addElement:&color3];
[newInstance addElement:&color4];
return newInstance;
}
/** @brief Creates and returns a new CPTGradient instance initialized with the Aqua pressed gradient.
* @return A new CPTGradient instance initialized with the Aqua pressed gradient.
**/
+(nonnull instancetype)aquaPressedGradient
{
CPTGradient *newInstance = [[self alloc] init];
CPTGradientElement color1;
color1.color.red = color1.color.green = color1.color.blue = CPTFloat(0.80);
color1.color.alpha = CPTFloat(1.00);
color1.position = CPTFloat(0.0);
CPTGradientElement color2;
color2.color.red = color2.color.green = color2.color.blue = CPTFloat(0.64);
color2.color.alpha = CPTFloat(1.00);
color2.position = CPTFloat(0.5);
CPTGradientElement color3;
color3.color.red = color3.color.green = color3.color.blue = CPTFloat(0.80);
color3.color.alpha = CPTFloat(1.00);
color3.position = CPTFloat(0.5);
CPTGradientElement color4;
color4.color.red = color4.color.green = color4.color.blue = CPTFloat(0.77);
color4.color.alpha = CPTFloat(1.00);
color4.position = CPTFloat(1.0);
[newInstance addElement:&color1];
[newInstance addElement:&color2];
[newInstance addElement:&color3];
[newInstance addElement:&color4];
return newInstance;
}
/** @brief Creates and returns a new CPTGradient instance initialized with the unified selected gradient.
* @return A new CPTGradient instance initialized with the unified selected gradient.
**/
+(nonnull instancetype)unifiedSelectedGradient
{
CPTGradient *newInstance = [[self alloc] init];
CPTGradientElement color1;
color1.color.red = color1.color.green = color1.color.blue = CPTFloat(0.85);
color1.color.alpha = CPTFloat(1.00);
color1.position = CPTFloat(0.0);
CPTGradientElement color2;
color2.color.red = color2.color.green = color2.color.blue = CPTFloat(0.95);
color2.color.alpha = CPTFloat(1.00);
color2.position = CPTFloat(1.0);
[newInstance addElement:&color1];
[newInstance addElement:&color2];
return newInstance;
}
/** @brief Creates and returns a new CPTGradient instance initialized with the unified normal gradient.
* @return A new CPTGradient instance initialized with the unified normal gradient.
**/
+(nonnull instancetype)unifiedNormalGradient
{
CPTGradient *newInstance = [[self alloc] init];
CPTGradientElement color1;
color1.color.red = color1.color.green = color1.color.blue = CPTFloat(0.75);
color1.color.alpha = CPTFloat(1.00);
color1.position = CPTFloat(0.0);
CPTGradientElement color2;
color2.color.red = color2.color.green = color2.color.blue = CPTFloat(0.90);
color2.color.alpha = CPTFloat(1.00);
color2.position = CPTFloat(1.0);
[newInstance addElement:&color1];
[newInstance addElement:&color2];
return newInstance;
}
/** @brief Creates and returns a new CPTGradient instance initialized with the unified pressed gradient.
* @return A new CPTGradient instance initialized with the unified pressed gradient.
**/
+(nonnull instancetype)unifiedPressedGradient
{
CPTGradient *newInstance = [[self alloc] init];
CPTGradientElement color1;
color1.color.red = color1.color.green = color1.color.blue = CPTFloat(0.60);
color1.color.alpha = CPTFloat(1.00);
color1.position = CPTFloat(0.0);
CPTGradientElement color2;
color2.color.red = color2.color.green = color2.color.blue = CPTFloat(0.75);
color2.color.alpha = CPTFloat(1.00);
color2.position = CPTFloat(1.0);
[newInstance addElement:&color1];
[newInstance addElement:&color2];
return newInstance;
}
/** @brief Creates and returns a new CPTGradient instance initialized with the unified dark gradient.
* @return A new CPTGradient instance initialized with the unified dark gradient.
**/
+(nonnull instancetype)unifiedDarkGradient
{
CPTGradient *newInstance = [[self alloc] init];
CPTGradientElement color1;
color1.color.red = color1.color.green = color1.color.blue = CPTFloat(0.68);
color1.color.alpha = CPTFloat(1.00);
color1.position = CPTFloat(0.0);
CPTGradientElement color2;
color2.color.red = color2.color.green = color2.color.blue = CPTFloat(0.83);
color2.color.alpha = CPTFloat(1.00);
color2.position = CPTFloat(1.0);
[newInstance addElement:&color1];
[newInstance addElement:&color2];
return newInstance;
}
/** @brief Creates and returns a new CPTGradient instance initialized with the source list selected gradient.
* @return A new CPTGradient instance initialized with the source list selected gradient.
**/
+(nonnull instancetype)sourceListSelectedGradient
{
CPTGradient *newInstance = [[self alloc] init];
CPTGradientElement color1;
color1.color.red = CPTFloat(0.06);
color1.color.green = CPTFloat(0.37);
color1.color.blue = CPTFloat(0.85);
color1.color.alpha = CPTFloat(1.00);
color1.position = CPTFloat(0.0);
CPTGradientElement color2;
color2.color.red = CPTFloat(0.30);
color2.color.green = CPTFloat(0.60);
color2.color.blue = CPTFloat(0.92);
color2.color.alpha = CPTFloat(1.00);
color2.position = CPTFloat(1.0);
[newInstance addElement:&color1];
[newInstance addElement:&color2];
return newInstance;
}
/** @brief Creates and returns a new CPTGradient instance initialized with the source list unselected gradient.
* @return A new CPTGradient instance initialized with the source list unselected gradient.
**/
+(nonnull instancetype)sourceListUnselectedGradient
{
CPTGradient *newInstance = [[self alloc] init];
CPTGradientElement color1;
color1.color.red = CPTFloat(0.43);
color1.color.green = CPTFloat(0.43);
color1.color.blue = CPTFloat(0.43);
color1.color.alpha = CPTFloat(1.00);
color1.position = CPTFloat(0.0);
CPTGradientElement color2;
color2.color.red = CPTFloat(0.60);
color2.color.green = CPTFloat(0.60);
color2.color.blue = CPTFloat(0.60);
color2.color.alpha = CPTFloat(1.00);
color2.position = CPTFloat(1.0);
[newInstance addElement:&color1];
[newInstance addElement:&color2];
return newInstance;
}
/** @brief Creates and returns a new CPTGradient instance initialized with a rainbow gradient.
* @return A new CPTGradient instance initialized with a rainbow gradient.
**/
+(nonnull instancetype)rainbowGradient
{
CPTGradient *newInstance = [[self alloc] init];
CPTGradientElement color1;
color1.color.red = CPTFloat(1.00);
color1.color.green = CPTFloat(0.00);
color1.color.blue = CPTFloat(0.00);
color1.color.alpha = CPTFloat(1.00);
color1.position = CPTFloat(0.0);
CPTGradientElement color2;
color2.color.red = CPTFloat(0.54);
color2.color.green = CPTFloat(0.00);
color2.color.blue = CPTFloat(1.00);
color2.color.alpha = CPTFloat(1.00);
color2.position = CPTFloat(1.0);
[newInstance addElement:&color1];
[newInstance addElement:&color2];
newInstance.blendingMode = CPTChromaticBlendingMode;
return newInstance;
}
/** @brief Creates and returns a new CPTGradient instance initialized with a hydrogen spectrum gradient.
* @return A new CPTGradient instance initialized with a hydrogen spectrum gradient.
**/
+(nonnull instancetype)hydrogenSpectrumGradient
{
CPTGradient *newInstance = [[self alloc] init];
struct {
CGFloat hue;
CGFloat position;
CGFloat width;
}
colorBands[4];
colorBands[0].hue = CPTFloat(22);
colorBands[0].position = CPTFloat(0.145);
colorBands[0].width = CPTFloat(0.01);
colorBands[1].hue = CPTFloat(200);
colorBands[1].position = CPTFloat(0.71);
colorBands[1].width = CPTFloat(0.008);
colorBands[2].hue = CPTFloat(253);
colorBands[2].position = CPTFloat(0.885);
colorBands[2].width = CPTFloat(0.005);
colorBands[3].hue = CPTFloat(275);
colorBands[3].position = CPTFloat(0.965);
colorBands[3].width = CPTFloat(0.003);
for ( NSUInteger i = 0; i < 4; i++ ) {
CGFloat color[4];
color[0] = colorBands[i].hue - CPTFloat(180.0) * colorBands[i].width;
color[1] = CPTFloat(1.0);
color[2] = CPTFloat(0.001);
color[3] = CPTFloat(1.0);
CPTTransformHSV_RGB(color);
CPTGradientElement fadeIn;
fadeIn.color.red = color[0];
fadeIn.color.green = color[1];
fadeIn.color.blue = color[2];
fadeIn.color.alpha = color[3];
fadeIn.position = colorBands[i].position - colorBands[i].width;
color[0] = colorBands[i].hue;
color[1] = CPTFloat(1.0);
color[2] = CPTFloat(1.0);
color[3] = CPTFloat(1.0);
CPTTransformHSV_RGB(color);
CPTGradientElement band;
band.color.red = color[0];
band.color.green = color[1];
band.color.blue = color[2];
band.color.alpha = color[3];
band.position = colorBands[i].position;
color[0] = colorBands[i].hue + CPTFloat(180.0) * colorBands[i].width;
color[1] = CPTFloat(1.0);
color[2] = CPTFloat(0.001);
color[3] = CPTFloat(1.0);
CPTTransformHSV_RGB(color);
CPTGradientElement fadeOut;
fadeOut.color.red = color[0];
fadeOut.color.green = color[1];
fadeOut.color.blue = color[2];
fadeOut.color.alpha = color[3];
fadeOut.position = colorBands[i].position + colorBands[i].width;
[newInstance addElement:&fadeIn];
[newInstance addElement:&band];
[newInstance addElement:&fadeOut];
}
newInstance.blendingMode = CPTChromaticBlendingMode;
return newInstance;
}
#pragma mark -
#pragma mark Modification
/** @brief Copies the current gradient and sets a new alpha value.
* @param alpha The alpha component (@num{0} ≤ @par{alpha} ≤ @num{1}).
* @return A copy of the current gradient with the new alpha value.
**/
-(CPTGradient *)gradientWithAlphaComponent:(CGFloat)alpha
{
CPTGradient *newGradient = [[[self class] alloc] init];
CPTGradientElement *curElement = self.elementList;
CPTGradientElement tempElement;
while ( curElement != NULL ) {
tempElement = *curElement;
tempElement.color.alpha = alpha;
[newGradient addElement:&tempElement];
curElement = curElement->nextElement;
}
newGradient.blendingMode = self.blendingMode;
newGradient.angle = self.angle;
newGradient.gradientType = self.gradientType;
return newGradient;
}
/** @brief Copies the current gradient and sets a new blending mode.
* @param mode The blending mode.
* @return A copy of the current gradient with the new blending mode.
**/
-(CPTGradient *)gradientWithBlendingMode:(CPTGradientBlendingMode)mode
{
CPTGradient *newGradient = [self copy];
newGradient.blendingMode = mode;
return newGradient;
}
/** @brief Copies the current gradient and adds a color stop.
*
* Adds a color stop with @par{color} at @par{position} in the list of color stops.
* If two elements are at the same position then it is added immediately after the one that was there already.
*
* @param color The color.
* @param position The color stop position (@num{0} ≤ @par{position} ≤ @num{1}).
* @return A copy of the current gradient with the new color stop.
**/
-(CPTGradient *)addColorStop:(nonnull CPTColor *)color atPosition:(CGFloat)position
{
CPTGradient *newGradient = [self copy];
CPTGradientElement newGradientElement;
// put the components of color into the newGradientElement - must make sure it is a RGB color (not Gray or CMYK)
newGradientElement.color = CPTRGBAColorFromCGColor(color.cgColor);
newGradientElement.position = position;
// Pass it off to addElement to take care of adding it to the elementList
[newGradient addElement:&newGradientElement];
return newGradient;
}
/** @brief Copies the current gradient and removes the color stop at @par{position} from the list of color stops.
* @param position The color stop position (@num{0} ≤ @par{position} ≤ @num{1}).
* @return A copy of the current gradient with the color stop removed.
**/
-(CPTGradient *)removeColorStopAtPosition:(CGFloat)position
{
CPTGradient *newGradient = [self copy];
CPTGradientElement removedElement = [newGradient removeElementAtPosition:position];
if ( isnan(removedElement.position)) {
[NSException raise:NSRangeException format:@"-[%@ removeColorStopAtPosition:]: no such colorStop at position (%g)", [self class], (double)position];
}
return newGradient;
}
/** @brief Copies the current gradient and removes the color stop at @par{idx} from the list of color stops.
* @param idx The color stop index.
* @return A copy of the current gradient with the color stop removed.
**/
-(CPTGradient *)removeColorStopAtIndex:(NSUInteger)idx
{
CPTGradient *newGradient = [self copy];
CPTGradientElement removedElement = [newGradient removeElementAtIndex:idx];
if ( isnan(removedElement.position)) {
[NSException raise:NSRangeException format:@"-[%@ removeColorStopAtIndex:]: index (%lu) beyond bounds", [self class], (unsigned long)idx];
}
return newGradient;
}
#pragma mark -
#pragma mark Information
/** @brief Gets the color at color stop @par{idx} from the list of color stops.
* @param idx The color stop index.
* @return The color at color stop @par{idx}.
**/
-(CGColorRef)newColorStopAtIndex:(NSUInteger)idx
{
CPTGradientElement *element = [self elementAtIndex:idx];
if ( element != NULL ) {
#if TARGET_OS_SIMULATOR || TARGET_OS_IPHONE
CGFloat colorComponents[4] = { element->color.red, element->color.green, element->color.blue, element->color.alpha };
return CGColorCreate(self.colorspace.cgColorSpace, colorComponents);
#else
return CGColorCreateGenericRGB(element->color.red, element->color.green, element->color.blue, element->color.alpha);
#endif
}
[NSException raise:NSRangeException format:@"-[%@ colorStopAtIndex:]: index (%lu) beyond bounds", [self class], (unsigned long)idx];
return NULL;
}
/** @brief Gets the color at an arbitrary position in the gradient.
* @param position The color stop position (@num{0} ≤ @par{position} ≤ @num{1}).
* @return The color at @par{position} in gradient.
**/
-(CGColorRef)newColorAtPosition:(CGFloat)position
{
CGFloat components[4] = { CPTFloat(0.0), CPTFloat(0.0), CPTFloat(0.0), CPTFloat(0.0) };
CGColorRef gradientColor;
switch ( self.blendingMode ) {
case CPTLinearBlendingMode:
CPTLinearEvaluation((__bridge void *)(self), &position, components);
break;
case CPTChromaticBlendingMode:
CPTChromaticEvaluation((__bridge void *)(self), &position, components);
break;
case CPTInverseChromaticBlendingMode:
CPTInverseChromaticEvaluation((__bridge void *)(self), &position, components);
break;
}
#if TARGET_OS_SIMULATOR || TARGET_OS_IPHONE
CGFloat colorComponents[4] = { components[0], components[1], components[2], components[3] };
gradientColor = CGColorCreate(self.colorspace.cgColorSpace, colorComponents);
#else
gradientColor = CGColorCreateGenericRGB(components[0], components[1], components[2], components[3]);
#endif
return gradientColor;
}
#pragma mark -
#pragma mark Drawing
/** @brief Draws the gradient into the given graphics context inside the provided rectangle.
* @param rect The rectangle to draw into.
* @param context The graphics context to draw into.
**/
-(void)drawSwatchInRect:(CGRect)rect inContext:(nonnull CGContextRef)context
{
[self fillRect:rect inContext:context];
}
/** @brief Draws the gradient into the given graphics context inside the provided rectangle.
* @param rect The rectangle to draw into.
* @param context The graphics context to draw into.
**/
-(void)fillRect:(CGRect)rect inContext:(nonnull CGContextRef)context
{
CGShadingRef myCGShading = NULL;
CGContextSaveGState(context);
CGContextClipToRect(context, rect);
switch ( self.gradientType ) {
case CPTGradientTypeAxial:
myCGShading = [self newAxialGradientInRect:rect];
break;
case CPTGradientTypeRadial:
myCGShading = [self newRadialGradientInRect:rect context:context];
break;
}
CGContextDrawShading(context, myCGShading);
CGShadingRelease(myCGShading);
CGContextRestoreGState(context);
}
/** @brief Draws the gradient into the given graphics context clipped to the current drawing path.
* @param context The graphics context to draw into.
**/
-(void)fillPathInContext:(nonnull CGContextRef)context
{
if ( !CGContextIsPathEmpty(context)) {
CGShadingRef myCGShading = NULL;
CGContextSaveGState(context);
CGRect bounds = CGContextGetPathBoundingBox(context);
CGContextClip(context);
switch ( self.gradientType ) {
case CPTGradientTypeAxial:
myCGShading = [self newAxialGradientInRect:bounds];
break;
case CPTGradientTypeRadial:
myCGShading = [self newRadialGradientInRect:bounds context:context];
break;
}
CGContextDrawShading(context, myCGShading);
CGShadingRelease(myCGShading);
CGContextRestoreGState(context);
}
}
#pragma mark -
#pragma mark Opacity
/// @cond
-(BOOL)isOpaque
{
BOOL opaqueGradient = YES;
CPTGradientElement *list = self.elementList;
while ( opaqueGradient && (list != NULL)) {
opaqueGradient = opaqueGradient && (list->color.alpha >= CPTFloat(1.0));
list = list->nextElement;
}
return opaqueGradient;
}
/// @endcond
#pragma mark -
#pragma mark Gradient comparison
/// @name Comparison
/// @{
/** @brief Returns a boolean value that indicates whether the received is equal to the given object.
* Gradients are equal if they have the same @ref blendingMode, @ref angle, @ref gradientType, and gradient colors at the same positions.
* @param object The object to be compared with the receiver.
* @return @YES if @par{object} is equal to the receiver, @NO otherwise.
**/
-(BOOL)isEqual:(nullable id)object
{
if ( self == object ) {
return YES;
}
else if ( [object isKindOfClass:[self class]] ) {
CPTGradient *otherGradient = (CPTGradient *)object;
BOOL equalGradients = (self.blendingMode == otherGradient.blendingMode) &&
(self.angle == otherGradient.angle) &&
(self.gradientType == otherGradient.gradientType);
if ( equalGradients ) {
equalGradients = ([self elementCount] == [otherGradient elementCount]);
}
if ( equalGradients ) {
CPTGradientElement *selfCurrentElement = self.elementList;
CPTGradientElement *otherCurrentElement = otherGradient.elementList;
while ( selfCurrentElement && otherCurrentElement ) {
if ( selfCurrentElement->color.red != otherCurrentElement->color.red ) {
equalGradients = NO;
break;
}
if ( selfCurrentElement->color.green != otherCurrentElement->color.green ) {
equalGradients = NO;
break;
}
if ( selfCurrentElement->color.blue != otherCurrentElement->color.blue ) {
equalGradients = NO;
break;
}
if ( selfCurrentElement->color.alpha != otherCurrentElement->color.alpha ) {
equalGradients = NO;
break;
}
if ( selfCurrentElement->position != otherCurrentElement->position ) {
equalGradients = NO;
break;
}
selfCurrentElement = selfCurrentElement->nextElement;
otherCurrentElement = otherCurrentElement->nextElement;
}
}
return equalGradients;
}
else {
return NO;
}
}
/// @}
/// @cond
-(NSUInteger)hash
{
// Equal objects must hash the same.
CGFloat theHash = CPTFloat(0.0);
CGFloat multiplier = CPTFloat(256.0);
CPTGradientElement *curElement = self.elementList;
if ( curElement ) {
CPTRGBAColor color = curElement->color;
theHash += multiplier * color.red;
multiplier *= CPTFloat(256.0);
theHash += multiplier * color.green;
multiplier *= CPTFloat(256.0);
theHash += multiplier * color.blue;
multiplier *= CPTFloat(256.0);
theHash += multiplier * color.alpha;