坂と落とし穴

落とし穴に落とさないようにボールを坂に転がすiPhoneアプリのサンプルコードを描いてみます。

#import “ViewController.h”

@import SpriteKit;

@interface ViewController ()

@property (nonatomic, weak) SKScene *scene;

@end

@implementation ViewController

– (void)viewDidLoad {

    [super viewDidLoad];

    [self setupScene];

    [self createMountHole];

}

– (void)setupScene {

    SKView *sv = [[SKView alloc] initWithFrame:self.view.bounds];

    SKScene *s = [SKScene sceneWithSize:sv.frame.size];

    s.backgroundColor = [UIColor brownColor];

    [sv presentScene:s];

    [self.view addSubview:sv];

    self.scene = s;

}

– (void)createMountHole {

    SKShapeNode *top = [SKShapeNode shapeNodeWithRectOfSize:CGSizeMake(100, 10)];

    top.fillColor = [UIColor greenColor];

    top.position = CGPointMake(70, CGRectGetMaxY(self.view.bounds) – 50);

    top.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:CGSizeMake(100, 10)];

    top.physicsBody.dynamic = NO;

    [self.scene addChild:top];

    

    float l = CGRectGetMaxX(self.view.bounds) – 100;

    float angle = 30.0 * M_PI / 180.0;

    

    

    SKShapeNode *slopeA = [SKShapeNode shapeNodeWithRectOfSize:CGSizeMake(2.0/5.0 * l / cos(angle), 10) cornerRadius:0];

    slopeA.position = CGPointMake(4.0/5.0 * l + 100, (1.0/5.0 * l) * tan(angle));

    slopeA.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:CGSizeMake(2.0/5.0 * l / cos(angle), 10)];

    slopeA.physicsBody.dynamic = NO;

    SKShapeNode *slopeB = [SKShapeNode shapeNodeWithRectOfSize:CGSizeMake(2.0/5.0 * l / cos(angle), 10) cornerRadius:0];

    slopeB.position = CGPointMake(1.0/5.0 * l + 100, (4.0/5.0 * l) * tan(angle));

    slopeB.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:CGSizeMake(2.0/5.0 * l / cos(angle), 10)];

    slopeB.physicsBody.dynamic = NO;

    

    SKShapeNode *hole = [SKShapeNode shapeNodeWithRectOfSize:CGSizeMake(1.0/5.0 * l / cos(angle), 10) cornerRadius:0];

    hole.position = CGPointMake(2.5/5.0 * l + 100, (2.5/5.0 * l) * tan(angle));

    hole.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:CGSizeMake(1.0/5.0 * l / cos(angle), 10)];

    hole.physicsBody.dynamic = NO;

    

    for (SKShapeNode *node in @[slopeA, slopeB, hole]) {

        node.fillColor = top.fillColor;

        node.zRotation = -angle;

        [self.scene addChild:node];

    }

    

    [hole runAction:[SKAction repeatActionForever:[SKAction sequence:@[[SKAction moveByX:0 y:-80 duration:1.5], [SKAction moveByX:0 y:80 duration:1.5]]]]];

    

}

– (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {

    SKShapeNode *ball = [SKShapeNode shapeNodeWithCircleOfRadius:10];

    ball.position = CGPointMake(0, CGRectGetMaxY(self.view.bounds));

    ball.lineWidth = 3;

    [self.scene addChild:ball];

    

    ball.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:10];

    [ball.physicsBody applyImpulse:CGVectorMake(5, 0)];

}

@end