Japanese pattern yagasuri

ViewController.m

//
//  ViewController.m
//  yagasuri
//
//  Created by MizushimaYusuke on 8/13/15.
//  Copyright (c) 2015 MizushimaYusuke. All rights reserved.
//

#import "ViewController.h"
@import SceneKit;

@interface ViewController ()
@property (nonatomic, weak) SCNView *sceneView;
@property (nonatomic, strong) NSMutableArray *patterns;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    [self setupScene];
    [self createJapanesePattern];
    [self createCamera];
}

- (void)setupScene {
    SCNView *sv = [[SCNView alloc] initWithFrame:self.view.bounds];
    sv.scene = [SCNScene scene];
    sv.backgroundColor = [self color:1];
    sv.allowsCameraControl = YES;
    sv.autoenablesDefaultLighting = YES;
    [self.view addSubview:sv];
    
    self.sceneView = sv;
}

- (void)createJapanesePattern {
    
    self.patterns = [NSMutableArray array];
    
    for (int i=0; i<45; i++) {
        float x = (i / 5) - 4;
        float y = 3.6 * (i % 5);
        UIColor *color = [self color: (i%2) ? 3 : 4];
        SCNNode *yagasuri = [self createYagasuri:color];
        yagasuri.position = SCNVector3Make(x, y, -50);
        [self.patterns addObject:yagasuri];
    }
}

- (SCNNode *)createYagasuri:(UIColor *)color {
    float h = 2;
    float w = 0.5;
    UIBezierPath *path = [UIBezierPath bezierPath];
    [path moveToPoint:CGPointMake(-w, h)];
    [path addLineToPoint:CGPointMake(-w, -h * 0.8)];
    [path addLineToPoint:CGPointMake(0, -h)];
    [path addLineToPoint:CGPointMake(0, h * 0.8)];
    [path closePath];
    
    SCNNode *yagasuri = [SCNNode node];
    [self.sceneView.scene.rootNode addChildNode:yagasuri];
    
    for (int i=0; i<2; i++) {
        SCNShape *half = [SCNShape shapeWithPath:path extrusionDepth:0.01];
        half.firstMaterial.diffuse.contents = color;
        SCNNode *halfNode = [SCNNode nodeWithGeometry:half];
        if (i==0) halfNode.rotation = SCNVector4Make(0, 1, 0, M_PI);
        [yagasuri addChildNode:halfNode];
    }

    return yagasuri;
}

- (void)createCamera {
    SCNNode *camera = [SCNNode node];
    camera.camera = [SCNCamera camera];
    camera.camera.usesOrthographicProjection = YES;
    camera.camera.orthographicScale = 10;
    camera.camera.zNear = -50;
    camera.camera.zFar = 100;
    [self.sceneView.scene.rootNode addChildNode:camera];
}

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    [NSTimer scheduledTimerWithTimeInterval:0.2 target:self selector:@selector(turn) userInfo:nil repeats:YES];
}

- (void)turn {
    SCNNode *yagasuri = [self.patterns lastObject];
    [self.patterns removeObject:yagasuri];
    [self.patterns insertObject:yagasuri atIndex:0];
    
    [yagasuri.childNodes enumerateObjectsUsingBlock:^(SCNNode *node, NSUInteger idx, BOOL *stop) {
        [node runAction:[SCNAction sequence:@[[SCNAction waitForDuration:idx * 0.5], [SCNAction rotateByAngle:-M_PI aroundAxis:SCNVector3Make(0, 1, 0) duration:1.0]]]];
    }];
}

#define ColorHex(rgb) [UIColor colorWithRed:((rgb & 0xFF0000) >> 16)/255.0 green:((rgb & 0xFF00) >> 8)/255.0 blue:(rgb & 0xFF)/255.0 alpha:1.0]
- (UIColor *)color:(int)i {
    if (i > 4) return nil;
    int code[] = {0xFF5B55, 0x18090E, 0xE5AE3C, 0xFFFFFF, 0x618443};
    return ColorHex(code[i]);
}

@end