85 lines
3.0 KiB
Objective-C
85 lines
3.0 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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// just ask unit for the value
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NSString* x1 = ([element attributeForName:@"x1"].stringValue ?: @"0");
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NSString* x2 = ([element attributeForName:@"x2"].stringValue ?: @"100%");
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NSString* y1 = ([element attributeForName:@"y1"].stringValue ?: @"0");
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NSString* y2 = ([element attributeForName:@"y2"].stringValue ?: @"0");
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aGradient.x1 = [IJSVGGradientUnitLength unitWithString:x1 fromUnitType:aGradient.units];
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aGradient.x2 = [IJSVGGradientUnitLength unitWithString:x2 fromUnitType:aGradient.units];
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aGradient.y1 = [IJSVGGradientUnitLength unitWithString:y1 fromUnitType:aGradient.units];
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aGradient.y2 = [IJSVGGradientUnitLength unitWithString:y2 fromUnitType:aGradient.units];
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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 selfTransform = IJSVGConcatTransforms(self.transforms);
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CGRect boundingBox = inUserSpace ? viewBox : objectRect;
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// make sure we apply the absolute position to
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// transform us back into the correct space
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if (inUserSpace == YES) {
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CGContextConcatCTM(ctx, absoluteTransform);
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}
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CGFloat width = CGRectGetWidth(boundingBox);
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CGFloat height = CGRectGetHeight(boundingBox);
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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 the context
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CGContextConcatCTM(ctx, selfTransform);
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// draw the gradient
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CGGradientDrawingOptions options = kCGGradientDrawsBeforeStartLocation | kCGGradientDrawsAfterEndLocation;
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CGContextDrawLinearGradient(ctx, self.CGGradient, gradientStartPoint,
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gradientEndPoint, options);
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#ifdef IJSVG_DEBUG
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[self _debugStart:gradientStartPoint
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end:gradientEndPoint
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context:ctx];
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#endif
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}
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@end
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