50 lines
1.3 KiB
Mathematica
50 lines
1.3 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 "ARTLinearGradient.h"
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#import "RCTConvert+ART.h"
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#import "RCTLog.h"
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@implementation ARTLinearGradient
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{
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CGGradientRef _gradient;
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CGPoint _startPoint;
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CGPoint _endPoint;
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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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_startPoint = [RCTConvert CGPoint:array offset:1];
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_endPoint = [RCTConvert CGPoint:array offset:3];
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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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CGContextDrawLinearGradient(context, _gradient, _startPoint, _endPoint, extendOptions);
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}
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@end
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