Created
September 16, 2012 08:16
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Really cruddy iOS particle system to demo emissionLongitude
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// | |
// SFSViewController.m | |
// AmazingParticleSpinner | |
// | |
// Created by Thomas Dimson on 9/15/12. | |
// Copyright (c) 2012 Thomas Dimson. All rights reserved. | |
// | |
#import "SFSViewController.h" | |
#import <QuartzCore/QuartzCore.h> | |
@implementation SFSViewController { | |
__weak UILabel *_angleLabel; | |
__weak CAEmitterLayer *_emitterLayer; | |
} | |
- (void)viewDidLoad | |
{ | |
[super viewDidLoad]; | |
CAEmitterLayer *emitterLayer = [CAEmitterLayer layer]; | |
emitterLayer.emitterPosition = self.view.center; | |
_emitterLayer = emitterLayer; | |
[self.view.layer addSublayer:emitterLayer]; | |
CAEmitterCell *funnyEmitterCell = [CAEmitterCell emitterCell]; | |
funnyEmitterCell.contents = (id)[UIImage imageNamed:@"funny.jpg"].CGImage; | |
funnyEmitterCell.birthRate = 10.0; | |
funnyEmitterCell.velocity = 200.0; | |
funnyEmitterCell.lifetime = 5.0; | |
funnyEmitterCell.scale = 0.1; | |
funnyEmitterCell.name = @"funny"; | |
emitterLayer.emitterCells = [NSArray arrayWithObject:funnyEmitterCell]; | |
[self bumpAngle]; | |
UILabel *angleLabel = [[UILabel alloc] initWithFrame:CGRectMake(20, 20, 100, 30)]; | |
angleLabel.backgroundColor = [UIColor clearColor]; | |
[self.view addSubview:angleLabel]; | |
_angleLabel = angleLabel; | |
} | |
- (void) bumpAngle { | |
NSNumber *emissionLongitude = [_emitterLayer valueForKeyPath:@"emitterCells.funny.emissionLongitude"]; | |
NSNumber *nextLongitude = [NSNumber numberWithFloat:[emissionLongitude floatValue] + 0.02]; | |
[_emitterLayer setValue:nextLongitude forKeyPath:@"emitterCells.funny.emissionLongitude"]; | |
_angleLabel.text = [NSString stringWithFormat:@"%.0f degrees", [nextLongitude floatValue] * 180 / M_PI]; | |
[self performSelector:@selector(bumpAngle) withObject:nil afterDelay:0.1]; | |
} | |
@end |
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