まゆ玉ころがし

まゆの形をした玉を坂の上からコロッコロころがしてあそぶiPhoneアプリを描いてみます。

動作イメージ

XcodeからiOS7 iPhone Simulatorで動かすとこんな感じになります。

サンプルコード

#import “ViewController.h”

#import <SpriteKit/SpriteKit.h>

#define ColorHex(rgbValue) [SKColor colorWithRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0 green:((float)((rgbValue & 0xFF00) >> 8))/255.0 blue:((float)(rgbValue & 0xFF))/255.0 alpha:1.0]

@interface CocoonScene : SKScene

@property BOOL contentCreated;

@end

@implementation CocoonScene

– (void)didMoveToView:(SKView *)view

{

    if (!self.contentCreated) {

        [self createSceneContents];

        self.contentCreated = YES;

    }

}

– (void)createSceneContents

{

    self.backgroundColor = ColorHex(0x4B5918);

    [self createSlopes];

    [self createCocoonBall:ColorHex(0xF2F2F2)];

}

– (void)createSlopes

{

    SKSpriteNode *slopeA = [SKSpriteNode spriteNodeWithColor:ColorHex(0x262018) size:CGSizeMake(320, 10)];

    slopeA.position = CGPointMake(200, 400);

    [self addChild:slopeA];

    slopeA.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:slopeA.size];

    slopeA.physicsBody.dynamic = NO;

    slopeA.physicsBody.friction = 5.0;

    SKAction *downA = [SKAction rotateByAngle:M_PI/15.0 duration:0];

    [slopeA runAction:downA];

    

    SKSpriteNode *slopeB = [SKSpriteNode spriteNodeWithColor:ColorHex(0x262018) size:CGSizeMake(320, 10)];

    slopeB.position = CGPointMake(120, 250);

    [self addChild:slopeB];

    slopeB.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:slopeB.size];

    slopeB.physicsBody.dynamic = NO;

    slopeB.physicsBody.friction = 5.0;

    SKAction *downB = [SKAction rotateByAngle:-M_PI/15.0 duration:0];

    [slopeB runAction:downB];

    

    SKSpriteNode *slopeC = [SKSpriteNode spriteNodeWithColor:ColorHex(0x262018) size:CGSizeMake(320, 10)];

    slopeC.position = CGPointMake(200, 100);

    [self addChild:slopeC];

    slopeC.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:slopeC.size];

    slopeC.physicsBody.dynamic = NO;

    slopeC.physicsBody.friction = 5.0;

    SKAction *downC = [SKAction rotateByAngle:M_PI/15.0 duration:0];

    [slopeC runAction:downC];

}

– (void)createCocoonBall:(SKColor*)color

{

    float r = 20;

    UIBezierPath *circlePath = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(-r/2.0, -r/2.0, r, r)];

    

    SKShapeNode *circleA = [SKShapeNode node];

    circleA.path = circlePath.CGPath;

    circleA.position = CGPointMake(250, 470);

    circleA.strokeColor = color;

    circleA.fillColor = color;

    [self addChild:circleA];

    circleA.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:r/2.0];

    circleA.physicsBody.density = 0.1;

    circleA.name = @”cocoonPart”;

    

    SKShapeNode *circleB = [SKShapeNode node];

    circleB.path = circlePath.CGPath;

    circleB.position = CGPointMake(250, 470 – r);

    circleB.strokeColor = color;

    circleB.fillColor = color;

    [self addChild:circleB];

    circleB.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:r/2.0];

    circleB.physicsBody.density = 0.1;

    circleB.name = @”cocoonPart”;

    

    SKSpriteNode *centerBar = [SKSpriteNode spriteNodeWithColor:color size:CGSizeMake(20, 1.5*r)];

    centerBar.position = CGPointMake(250, 470 – r/2.0);

    centerBar.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:centerBar.size];

    [self addChild:centerBar];

    centerBar.name = @”cocoonPart”;

    

    SKPhysicsJointFixed *fixedA = [SKPhysicsJointFixed jointWithBodyA:circleA.physicsBody bodyB:centerBar.physicsBody anchor:circleA.position];

    [self.physicsWorld addJoint:fixedA];

    

    SKPhysicsJointFixed *fixedB = [SKPhysicsJointFixed jointWithBodyA:circleB.physicsBody bodyB:centerBar.physicsBody anchor:circleB.position];

    [self.physicsWorld addJoint:fixedB];

    

    SKShapeNode *weight = [SKShapeNode node];

    weight.name = @”cocoonPart”;

    weight.path = circlePath.CGPath;

    weight.fillColor = [SKColor clearColor];

    weight.strokeColor = [SKColor clearColor];

    weight.position = centerBar.position;

    [self addChild:weight];

    weight.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:r/2.0];

    weight.physicsBody.categoryBitMask = 0x00000000;

    weight.physicsBody.collisionBitMask = 0x00000000;

    weight.physicsBody.contactTestBitMask = 0xFFFFFFFF;

    weight.physicsBody.linearDamping = 0;

    weight.physicsBody.density = 50.0;

    

    SKPhysicsJointSliding *sl = [SKPhysicsJointSliding jointWithBodyA:centerBar.physicsBody bodyB:weight.physicsBody anchor:weight.position axis:CGVectorMake(0, 1)];

    sl.shouldEnableLimits = YES;

    sl.lowerDistanceLimit = -r/2.0;

    sl.upperDistanceLimit = r/2.0;

    [self.physicsWorld addJoint:sl];

}

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

{

    int rand = arc4random() % 3;

    

    switch (rand) {

        case 0:

            [self createCocoonBall:ColorHex(0xF2F2F2)];

            break;

        case 1:

            [self createCocoonBall:ColorHex(0xBFAC88)];

            break;

        case 2:

            [self createCocoonBall:ColorHex(0x732D14)];

            break;

            

    }

}

– (void)didSimulatePhysics

{

    [self enumerateChildNodesWithName:@”cocoonPart” usingBlock:^(SKNode *node, BOOL *stop) {

        if (node.position.y < 0) {

            [node removeFromParent];

        }

    }];

}

@end

@interface ViewController ()

@end

@implementation ViewController

– (void)viewDidLoad

{

    [super viewDidLoad];

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

    [self.view addSubview:spriteView];

    

    SKScene *scene = [[CocoonScene alloc] initWithSize:spriteView.bounds.size];

    [spriteView presentScene:scene];

}

– (void)didReceiveMemoryWarning

{

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

@end