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//
// NSBezierPath_AMShading.m
// ------------------------
//
// Created by Andreas on 2005-06-01.
// Copyright 2005 Andreas Mayer. All rights reserved.
//
#import "NSBezierPath_AMShading.h"
@implementation NSBezierPath (AMShading)
static void linearShadedColor(void *info, const CGFloat *in, CGFloat *out)
{
CGFloat *colors = (CGFloat *)info;
*out++ = colors[0] + *in * colors[8];
*out++ = colors[1] + *in * colors[9];
*out++ = colors[2] + *in * colors[10];
*out++ = colors[3] + *in * colors[11];
}
static void bilinearShadedColor(void *info, const CGFloat *in, CGFloat *out)
{
CGFloat *colors = (CGFloat *)info;
CGFloat factor = (*in) * 2.0;
if (*in > 0.5) {
factor = 2 - factor;
}
*out++ = colors[0] + factor * colors[8];
*out++ = colors[1] + factor * colors[9];
*out++ = colors[2] + factor * colors[10];
*out++ = colors[3] + factor * colors[11];
}
- (void)linearGradientFillWithStartColor:(NSColor *)startColor endColor:(NSColor *)endColor
{
static const CGFunctionCallbacks callbacks = { 0, &linearShadedColor, NULL };
[self customHorizontalFillWithCallbacks:callbacks firstColor:startColor secondColor:endColor];
}
- (void)linearVerticalGradientFillWithStartColor:(NSColor *)startColor endColor:(NSColor *)endColor
{
static const CGFunctionCallbacks callbacks = { 0, &linearShadedColor, NULL };
[self customVerticalFillWithCallbacks:callbacks firstColor:startColor secondColor:endColor];
}
- (void)bilinearGradientFillWithOuterColor:(NSColor *)outerColor innerColor:(NSColor *)innerColor
{
static const CGFunctionCallbacks callbacks = { 0, &bilinearShadedColor, NULL };
[self customHorizontalFillWithCallbacks:callbacks firstColor:innerColor secondColor:outerColor];
}
- (void)customFillWithCallbacks:(CGFunctionCallbacks)functionCallbacks firstColor:(NSColor *)firstColor secondColor:(NSColor *)secondColor startPoint:(CGPoint)startPoint endPoint:(CGPoint)endPoint
{
CGColorSpaceRef colorspace;
CGShadingRef shading;
CGFunctionRef function;
CGFloat colors[12]; // pointer to color values
// get my context
CGContextRef currentContext = (CGContextRef)[[NSGraphicsContext currentContext] graphicsPort];
NSColor *deviceDependentFirstColor = [firstColor colorUsingColorSpaceName:NSDeviceRGBColorSpace];
NSColor *deviceDependentSecondColor = [secondColor colorUsingColorSpaceName:NSDeviceRGBColorSpace];
// set up colors for gradient
colors[0] = [deviceDependentFirstColor redComponent];
colors[1] = [deviceDependentFirstColor greenComponent];
colors[2] = [deviceDependentFirstColor blueComponent];
colors[3] = [deviceDependentFirstColor alphaComponent];
colors[4] = [deviceDependentSecondColor redComponent];
colors[5] = [deviceDependentSecondColor greenComponent];
colors[6] = [deviceDependentSecondColor blueComponent];
colors[7] = [deviceDependentSecondColor alphaComponent];
// difference between start and end color for each color components
colors[8] = (colors[4] - colors[0]);
colors[9] = (colors[5] - colors[1]);
colors[10] = (colors[6] - colors[2]);
colors[11] = (colors[7] - colors[3]);
// draw gradient
colorspace = CGColorSpaceCreateDeviceRGB();
size_t components = 1 + CGColorSpaceGetNumberOfComponents(colorspace);
static const CGFloat domain[2] = { 0.0, 1.0 };
static const CGFloat range[10] = { 0, 1, 0, 1, 0, 1, 0, 1, 0, 1 };
//static const CGFunctionCallbacks callbacks = {0, &bilinearShadedColor, NULL};
// Create a CGFunctionRef that describes a function taking 1 input and kChannelsPerColor outputs.
function = CGFunctionCreate(colors, 1, domain, components, range, &functionCallbacks);
shading = CGShadingCreateAxial(colorspace, startPoint, endPoint, function, NO, NO);
CGContextSaveGState(currentContext);
[self addClip];
CGContextDrawShading(currentContext, shading);
CGContextRestoreGState(currentContext);
CGShadingRelease(shading);
CGFunctionRelease(function);
CGColorSpaceRelease(colorspace);
}
- (void)customHorizontalFillWithCallbacks:(CGFunctionCallbacks)functionCallbacks firstColor:(NSColor *)firstColor secondColor:(NSColor *)secondColor
{
[self customFillWithCallbacks:functionCallbacks
firstColor:firstColor
secondColor:secondColor
startPoint:CGPointMake(0, NSMinY([self bounds]))
endPoint:CGPointMake(0, NSMaxY([self bounds]))];
}
- (void)customVerticalFillWithCallbacks:(CGFunctionCallbacks)functionCallbacks firstColor:(NSColor *)firstColor secondColor:(NSColor *)secondColor
{
[self customFillWithCallbacks:functionCallbacks
firstColor:firstColor
secondColor:secondColor
startPoint:CGPointMake(NSMinX([self bounds]), 0)
endPoint:CGPointMake(NSMaxX([self bounds]), 0)];
}
@end
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