mirror of
https://github.com/zoriya/react-native-svg.git
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Horcrux
61 lines
1.9 KiB
Objective-C
61 lines
1.9 KiB
Objective-C
/**
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* Copyright (c) 2015-present, Horcrux.
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* All rights reserved.
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*
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* This source code is licensed under the MIT-style license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#import "RNSVGLinearGradient.h"
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#import "RCTConvert+RNSVG.h"
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#import "RCTLog.h"
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@implementation RNSVGLinearGradient
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{
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CGGradientRef _gradient;
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}
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- (instancetype)initWithArray:(NSArray *)array
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{
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if ((self = [super initWithArray:array])) {
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if (array.count < 5) {
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RCTLogError(@"-[%@ %@] expects 5 elements, received %@",
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self.class, NSStringFromSelector(_cmd), array);
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return nil;
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}
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_points = [array subarrayWithRange:NSMakeRange(1, 4)];
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_gradient = CGGradientRetain([RCTConvert CGGradient:array offset:5]);
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}
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return self;
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}
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- (void)dealloc
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{
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CGGradientRelease(_gradient);
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}
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- (void)paint:(CGContextRef)context
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{
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CGGradientDrawingOptions extendOptions =
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kCGGradientDrawsBeforeStartLocation | kCGGradientDrawsAfterEndLocation;
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CGRect box = CGContextGetClipBoundingBox(context);
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float height = CGRectGetHeight(box);
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float width = CGRectGetWidth(box);
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float midX = CGRectGetMidX(box);
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float midY = CGRectGetMidY(box);
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float offsetX = (midX - width / 2);
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float offsetY = (midY - height / 2);
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RNSVGPercentageConverter* convert = [[RNSVGPercentageConverter alloc] init];
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CGFloat x1 = [convert stringToFloat:(NSString *)[_points objectAtIndex:0] relative:width offset:offsetX];
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CGFloat y1 = [convert stringToFloat:(NSString *)[_points objectAtIndex:1] relative:height offset:offsetY];
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CGFloat x2 = [convert stringToFloat:(NSString *)[_points objectAtIndex:2] relative:width offset:offsetX];
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CGFloat y2 = [convert stringToFloat:(NSString *)[_points objectAtIndex:3] relative:height offset:offsetY];
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CGContextDrawLinearGradient(context, _gradient, CGPointMake(x1, y1), CGPointMake(x2, y2), extendOptions);
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}
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@end
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