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