hole slope

ViewController.m

//
//  ViewController.m
//  HoleSlope
//
//  Created by MizushimaYusuke on 8/27/16.
//  Copyright © 2016 MizushimaYusuke. All rights reserved.
//

#import "ViewController.h"
@import SpriteKit;

@interface ViewController ()
@property (nonatomic, weak) SKScene *scene;
@end

@implementation ViewController

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

- (void)setupScene {
    SKView *sv = [[SKView alloc] initWithFrame:self.view.bounds];
    SKScene *s = [SKScene sceneWithSize:sv.frame.size];
    [sv presentScene:s];
    [self.view addSubview:sv];
    self.scene = s;
}

- (void)createHole {
    CGSize size = CGSizeMake(CGRectGetMaxX(self.view.bounds), CGRectGetMaxY(self.view.bounds) * 0.7);

    UIGraphicsBeginImageContextWithOptions(size, false, true);
    [[UIColor brownColor] set];
    CGContextFillRect(UIGraphicsGetCurrentContext(), CGRectMake(0, 0, size.width, size.height));
    
    CGContextSetBlendMode(UIGraphicsGetCurrentContext(), kCGBlendModeClear);
    
    CGPoint points[] = {
        {50, 0}, {100, 100},
        {100, 100}, {300, 150},
        {300, 150}, {200, 350},
        {200, 350}, {300, 400}
    };
    
    CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 30);
    for (int i=0; i<8; i += 2) {
        CGPoint line[2] = {points[i], points[i+1]};
        CGContextStrokeLineSegments(UIGraphicsGetCurrentContext(), line, 2);
        CGContextFillEllipseInRect(UIGraphicsGetCurrentContext(), CGRectMake(line[0].x - 20 , line[0].y - 20, 40, 40));
        CGContextFillEllipseInRect(UIGraphicsGetCurrentContext(), CGRectMake(line[1].x - 20 , line[1].y - 20, 40, 40));
    }
    
    UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    SKTexture *texture = [SKTexture textureWithImage:img];
    SKSpriteNode *hole = [SKSpriteNode spriteNodeWithTexture:texture];
    hole.position = CGPointMake(CGRectGetMidX(self.view.bounds), CGRectGetMaxY(self.view.bounds) * 0.35);
    [self.scene addChild:hole];
    
    hole.physicsBody = [SKPhysicsBody bodyWithTexture:texture size:texture.size];
    hole.physicsBody.dynamic = false;
}

- (void)createBall {
    UIGraphicsBeginImageContextWithOptions(CGSizeMake(50, 50), false, 0);
    [[UIColor darkGrayColor] set];
    CGContextFillEllipseInRect(UIGraphicsGetCurrentContext(), CGRectMake(20, 5, 10, 12));
    CGContextFillEllipseInRect(UIGraphicsGetCurrentContext(), CGRectMake(20, 15, 10, 10));
    CGContextFillEllipseInRect(UIGraphicsGetCurrentContext(), CGRectMake(18, 25, 14, 22));
    
    CGPoint points[] = {
        {25, 10} , {20, 0},
        {25, 10} , {30, 0},
        {25, 25} , {10, 10},
        {25, 25} , {40, 10},
        {25, 25} , {10, 25},
        {25, 25} , {40, 25},
        {25, 25} , {10, 40},
        {25, 25} , {40, 40},
    };
    
    CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 2);
    for (int i=0; i<14; i += 2) {
        CGPoint line[2] = {points[i], points[i+1]};
        CGContextStrokeLineSegments(UIGraphicsGetCurrentContext(), line, 2);
    }
    
    UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    SKTexture *texture = [SKTexture textureWithImage:img];
    
    SKSpriteNode *ant = [SKSpriteNode spriteNodeWithTexture:texture];
   
    ant.position = CGPointMake(50, CGRectGetMaxY(self.view.bounds) - 100);
    [self.scene addChild:ant];
    
    ant.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:13];
    ant.physicsBody.angularDamping = 1.0;
    ant.physicsBody.friction = 0.1;
}

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    [self createBall];
}

@end

http://lepetit-prince.net/ios/?p=5449