58 lines
1.7 KiB
Mathematica
58 lines
1.7 KiB
Mathematica
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/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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#import "ARTRadialGradient.h"
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#import <React/RCTLog.h>
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#import "RCTConvert+ART.h"
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@implementation ARTRadialGradient
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{
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CGGradientRef _gradient;
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CGPoint _focusPoint;
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CGPoint _centerPoint;
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CGFloat _radius;
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CGFloat _radiusRatio;
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}
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- (instancetype)initWithArray:(NSArray<NSNumber *> *)array
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{
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if ((self = [super initWithArray:array])) {
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if (array.count < 7) {
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RCTLogError(@"-[%@ %@] expects 7 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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_radius = [RCTConvert CGFloat:array[3]];
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_radiusRatio = [RCTConvert CGFloat:array[4]] / _radius;
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_focusPoint.x = [RCTConvert CGFloat:array[1]];
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_focusPoint.y = [RCTConvert CGFloat:array[2]] / _radiusRatio;
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_centerPoint.x = [RCTConvert CGFloat:array[5]];
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_centerPoint.y = [RCTConvert CGFloat:array[6]] / _radiusRatio;
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_gradient = CGGradientRetain([RCTConvert CGGradient:array offset:7]);
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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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CGAffineTransform transform = CGAffineTransformMakeScale(1, _radiusRatio);
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CGContextConcatCTM(context, transform);
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CGGradientDrawingOptions extendOptions = kCGGradientDrawsBeforeStartLocation | kCGGradientDrawsAfterEndLocation;
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CGContextDrawRadialGradient(context, _gradient, _focusPoint, 0, _centerPoint, _radius, extendOptions);
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}
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@end
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