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08e31e1c37
Eases support for nesting horizontally scrolling elements within a vertical scroller. Further changes will improve the API, and optimize handling of the nested working ranges.
45 lines
1.6 KiB
Objective-C
45 lines
1.6 KiB
Objective-C
//
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// RandomCoreGraphicsNode.m
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// Sample
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//
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// Created by Scott Goodson on 9/5/15.
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// Copyright (c) 2015 Facebook. All rights reserved.
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//
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#import "RandomCoreGraphicsNode.h"
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#import <AsyncDisplayKit/ASDisplayNode+Subclasses.h>
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@implementation RandomCoreGraphicsNode
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+ (UIColor *)randomColor
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{
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CGFloat hue = ( arc4random() % 256 / 256.0 ); // 0.0 to 1.0
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CGFloat saturation = ( arc4random() % 128 / 256.0 ) + 0.5; // 0.5 to 1.0, away from white
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CGFloat brightness = ( arc4random() % 128 / 256.0 ) + 0.5; // 0.5 to 1.0, away from black
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return [UIColor colorWithHue:hue saturation:saturation brightness:brightness alpha:1];
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}
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+ (void)drawRect:(CGRect)bounds withParameters:(id<NSObject>)parameters isCancelled:(asdisplaynode_iscancelled_block_t)isCancelledBlock isRasterizing:(BOOL)isRasterizing
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{
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CGFloat locations[3];
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NSMutableArray *colors = [NSMutableArray arrayWithCapacity:3];
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[colors addObject:(id)[[RandomCoreGraphicsNode randomColor] CGColor]];
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locations[0] = 0.0;
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[colors addObject:(id)[[RandomCoreGraphicsNode randomColor] CGColor]];
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locations[1] = 1.0;
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[colors addObject:(id)[[RandomCoreGraphicsNode randomColor] CGColor]];
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locations[2] = ( arc4random() % 256 / 256.0 );
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CGContextRef ctx = UIGraphicsGetCurrentContext();
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CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
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CGGradientRef gradient = CGGradientCreateWithColors(colorSpace, (CFArrayRef)colors, locations);
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CGGradientDrawingOptions drawingOptions;
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CGContextDrawLinearGradient(ctx, gradient, CGPointZero, CGPointMake(bounds.size.width, bounds.size.height), drawingOptions);
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CGColorSpaceRelease(colorSpace);
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}
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@end
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