Curtis Hard
94 lines
3.9 KiB
Objective-C
94 lines
3.9 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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startPoint:(CGPoint *)startPoint
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endPoint:(CGPoint *)endPoint
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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 <= 1.f && px2 <= 1.f && py1 <= 1.f && py2 <= 1.f) {
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isPercent = YES;
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} else 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:[NSColorSpace genericRGBColorSpace]] autorelease];
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free(stopsParams);
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return grad;
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}
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- (void)drawInContextRef:(CGContextRef)ctx
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rect:(NSRect)rect
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{
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// grab the start and end point
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CGPoint aStartPoint = (CGPoint){
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.x = [self.x1 computeValue:rect.size.width],
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.y = [self.y1 computeValue:rect.size.height]
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};
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CGPoint aEndPoint = (CGPoint){
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.x = [self.x2 computeValue:rect.size.width],
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.y = [self.y2 computeValue:rect.size.height]
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};
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// convert the nsgradient to a CGGradient
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CGGradientRef gRef = [self CGGradient];
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// apply transform for each point
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for( IJSVGTransform * transform in self.transforms ) {
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CGAffineTransform trans = transform.CGAffineTransform;
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aStartPoint = CGPointApplyAffineTransform(aStartPoint, trans);
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aEndPoint = CGPointApplyAffineTransform(aEndPoint, trans);
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}
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// draw the gradient
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CGGradientDrawingOptions opt = kCGGradientDrawsBeforeStartLocation|kCGGradientDrawsAfterEndLocation;
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CGContextDrawLinearGradient(ctx, gRef, aStartPoint, aEndPoint, opt);
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}
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@end
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