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JuliaCell.m
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JuliaCell.m
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// Copyright (c) 2012 Rob Napier
//
// This code is licensed under the MIT License:
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
#import "JuliaCell.h"
#import "JuliaOperation.h"
@interface JuliaCell ()
@property (weak, nonatomic) IBOutlet UIImageView *imageView;
@property (weak, nonatomic) IBOutlet UILabel *label;
@property (nonatomic, readwrite, strong) NSMutableArray *operations;
@end
@implementation JuliaCell
- (void)prepareForReuse {
[self.operations makeObjectsPerformSelector:@selector(cancel)];
[self.operations removeAllObjects];
self.imageView.image = nil;
self.label.text = @"";
}
- (void)awakeFromNib {
self.operations = [NSMutableArray new];
}
- (JuliaOperation *)operationForScale:(CGFloat)scale
seed:(NSUInteger)seed {
JuliaOperation *op = [[JuliaOperation alloc] init];
op.contentScaleFactor = scale;
CGRect bounds = self.bounds;
op.width = (unsigned)(CGRectGetWidth(bounds) * scale);
op.height = (unsigned)(CGRectGetHeight(bounds) * scale);
srandom(seed);
op.c = (long double)random()/LONG_MAX + I*(long double)random()/LONG_MAX;
op.blowup = random();
op.rScale = random() % 20; // Biased, but simple is more important
op.gScale = random() % 20;
op.bScale = random() % 20;
__weak JuliaOperation *weakOp = op;
op.completionBlock = ^{
if (! weakOp.isCancelled) {
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
JuliaOperation *strongOp = weakOp;
if (strongOp && [self.operations containsObject:strongOp]) {
self.imageView.image = strongOp.image;
self.label.text = strongOp.description;
[self.operations removeObject:strongOp];
}
}];
}
};
if (scale < 0.5) {
op.queuePriority = NSOperationQueuePriorityVeryHigh;
}
else if (scale <= 1) {
op.queuePriority = NSOperationQueuePriorityHigh;
}
else {
op.queuePriority = NSOperationQueuePriorityNormal;
}
return op;
}
- (void)configureWithSeed:(NSUInteger)seed
queue:(NSOperationQueue *)queue
scales:(NSArray *)scales {
CGFloat maxScale = [[UIScreen mainScreen] scale];
self.contentScaleFactor = maxScale;
NSUInteger kIterations = 6;
CGFloat minScale = maxScale/pow(2, kIterations);
JuliaOperation *prevOp = nil;
for (CGFloat scale = minScale; scale <= maxScale; scale *= 2) {
JuliaOperation *op = [self operationForScale:scale seed:seed];
if (prevOp) {
[op addDependency:prevOp];
}
[self.operations addObject:op];
[queue addOperation:op];
prevOp = op;
}
}
@end