Curtis Hard
107 lines
4.5 KiB
Objective-C
107 lines
4.5 KiB
Objective-C
//
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// IJSVGGradient.m
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// IJSVGExample
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//
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// Created by Curtis Hard on 03/09/2014.
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// Copyright (c) 2014 Curtis Hard. All rights reserved.
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//
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#import "IJSVGLinearGradient.h"
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#import "IJSVGUtils.h"
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@implementation IJSVGLinearGradient
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+ (NSGradient *)parseGradient:(NSXMLElement *)element
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gradient:(IJSVGLinearGradient *)aGradient
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{
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CGFloat px1 = [[element attributeForName:@"x1"] stringValue].floatValue;
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CGFloat px2 = [[element attributeForName:@"x2"] stringValue].floatValue;
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CGFloat py1 = [[element attributeForName:@"y1"] stringValue].floatValue;
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CGFloat py2 = [[element attributeForName:@"y2"] stringValue].floatValue;
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// work out each coord, and work out if its a % or not
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// annoyingly we need to check them all against each other -_-
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BOOL isPercent = NO;
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if((px1 >= 0.f && px1 <= 1.f) && (px2 >= 0.f && px2 <= 1.f) &&
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(py1 >= 0.f && py1 <= 1.f) && (py2 >= 0.f && py2 <= 1.f)) {
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isPercent = YES;
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}
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// assume its a vertical / horizonal
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if(isPercent == NO) {
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// just ask unit for the value
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aGradient.x1 = [IJSVGGradientUnitLength unitWithString:[[element attributeForName:@"x1"] stringValue] ?: @"0"];
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aGradient.x2 = [IJSVGGradientUnitLength unitWithString:[[element attributeForName:@"x2"] stringValue] ?: @"100"];
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aGradient.y1 = [IJSVGGradientUnitLength unitWithString:[[element attributeForName:@"y1"] stringValue] ?: @"0"];
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aGradient.y2 = [IJSVGGradientUnitLength unitWithString:[[element attributeForName:@"y2"] stringValue] ?: @"0"];
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} else {
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// make sure its a percent!
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aGradient.x1 = [IJSVGGradientUnitLength unitWithPercentageString:[[element attributeForName:@"x1"] stringValue] ?: @"0"];
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aGradient.x2 = [IJSVGGradientUnitLength unitWithPercentageString:[[element attributeForName:@"x2"] stringValue] ?: @"1"];
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aGradient.y1 = [IJSVGGradientUnitLength unitWithPercentageString:[[element attributeForName:@"y1"] stringValue] ?: @"0"];
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aGradient.y2 = [IJSVGGradientUnitLength unitWithPercentageString:[[element attributeForName:@"y2"] stringValue] ?: @"0"];
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}
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// compute the color stops and colours
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NSArray * colors = nil;
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CGFloat * stopsParams = [[self class] computeColorStopsFromString:element
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colors:&colors];
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// create the gradient with the colours
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NSGradient * grad = [[NSGradient alloc] initWithColors:colors
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atLocations:stopsParams
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colorSpace:IJSVGColor.defaultColorSpace];
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free(stopsParams);
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return [grad autorelease];
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}
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- (void)drawInContextRef:(CGContextRef)ctx
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objectRect:(NSRect)objectRect
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absoluteTransform:(CGAffineTransform)absoluteTransform
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viewPort:(CGRect)viewBox
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{
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BOOL inUserSpace = self.units == IJSVGUnitUserSpaceOnUse;
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CGPoint gradientStartPoint = CGPointZero;
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CGPoint gradientEndPoint = CGPointZero;
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CGAffineTransform absTransform = absoluteTransform;
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CGAffineTransform selfTransform = IJSVGConcatTransforms(self.transforms);
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#pragma mark User Space On Use
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if(inUserSpace == YES) {
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CGFloat width = CGRectGetWidth(viewBox);
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CGFloat height = CGRectGetHeight(viewBox);
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gradientStartPoint = CGPointMake([self.x1 computeValue:width],
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[self.y1 computeValue:height]);
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gradientEndPoint = CGPointMake([self.x2 computeValue:width],
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[self.y2 computeValue:height]);
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// transform absolute - due to user space
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CGContextConcatCTM(ctx, absTransform);
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} else {
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#pragma mark Object Bounding Box
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CGFloat width = CGRectGetWidth(objectRect);
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CGFloat height = CGRectGetHeight(objectRect);
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gradientStartPoint = CGPointMake([self.x1 computeValue:width],
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[self.y1 computeValue:height]);
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gradientEndPoint = CGPointMake([self.x2 computeValue:width],
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[self.y2 computeValue:height]);
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}
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// transform the context
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CGContextConcatCTM(ctx, selfTransform);
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// draw the gradient
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CGGradientDrawingOptions options = kCGGradientDrawsBeforeStartLocation|
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kCGGradientDrawsAfterEndLocation;
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CGContextDrawLinearGradient(ctx, self.CGGradient, gradientStartPoint,
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gradientEndPoint, options);
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}
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@end
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