ピッチングマシーン

ピッチングマシーンが玉を飛ばすだけのiPhoneアプリのサンプルコードを描いてみます。

#import “ViewController.h”

#import <SpriteKit/SpriteKit.h>

@interface PitchingScene : SKScene

@end

@implementation PitchingScene

– (void)didMoveToView:(SKView *)view

{

    [self createMachine];

}

– (void)createMachine

{

    SKSpriteNode *body = [SKSpriteNode spriteNodeWithColor:[SKColor redColor] size:CGSizeMake(10, 100)];

    body.position = CGPointMake(60, 50);

    [self addChild:body];

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

    body.physicsBody.dynamic = NO;

    body.physicsBody.collisionBitMask = 0x2;

    body.physicsBody.categoryBitMask = 0x2;

    UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:CGPointZero radius:20 startAngle:0 endAngle:2*M_PI clockwise:NO];

    for (int i=0; i<2; i++) {

        SKShapeNode *tire = [SKShapeNode node];

        tire.name = [NSString stringWithFormat:@”tire%d”, i];

        tire.path = path.CGPath;

        tire.position = CGPointMake(body.position.x, 52.5 * i + 40);

        tire.fillColor = [[SKColor whiteColor] colorWithAlphaComponent:0.8];

        [self addChild:tire];

        tire.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:20];

        tire.physicsBody.friction = 1.0;

        tire.physicsBody.categoryBitMask = 0x1;

        tire.physicsBody.collisionBitMask = 0x1;

        

        SKPhysicsJointPin *pin = [SKPhysicsJointPin jointWithBodyA:tire.physicsBody bodyB:body.physicsBody anchor:tire.position];

        [self.physicsWorld addJoint:pin];

    }

    

    UIBezierPath *guidePath = [UIBezierPath bezierPath];

    [guidePath moveToPoint:CGPointMake(-20, 50)];

    [guidePath addLineToPoint:CGPointMake(-20, –20)];

    [guidePath addArcWithCenter:CGPointMake(0, –20) radius:20 startAngle:M_PI endAngle:3.0*M_PI_2 clockwise:YES];

    SKShapeNode *guide = [SKShapeNode node];

    guide.position = CGPointMake(30, 100);

    guide.path = guidePath.CGPath;

    guide.lineWidth = 3;

    

    SKSpriteNode *guideB = [SKSpriteNode spriteNodeWithColor:[SKColor whiteColor] size:CGSizeMake(4, 60)];

    guideB.position = CGPointMake(30, 120);

    [self addChild:guideB];

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

    guideB.physicsBody.dynamic = NO;

    

    guide.physicsBody = [SKPhysicsBody bodyWithEdgeChainFromPath:guidePath.CGPath];

    [self addChild:guide];

}

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

{

    [self createBall];

}

– (void)update:(NSTimeInterval)currentTime

{

    SKNode *tireOne = [self childNodeWithName:@”tire0″];

    tireOne.physicsBody.angularVelocity = –200.0;

    

    SKNode *tireTwo = [self childNodeWithName:@”tire1″];

    tireTwo.physicsBody.angularVelocity = 200.0;

}

– (void)createBall

{

    UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:CGPointZero radius:9 startAngle:0 endAngle:2*M_PI clockwise:NO];

    SKShapeNode *ball = [SKShapeNode node];

    ball.path = path.CGPath;

    ball.position = CGPointMake(20, 150);

    ball.fillColor = [SKColor whiteColor];

    [self addChild:ball];

    

    ball.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:9];

    ball.physicsBody.categoryBitMask = 0x1;

    ball.physicsBody.collisionBitMask = 0x1;

}

@end

@interface ViewController ()

@end

@implementation ViewController

– (void)viewDidAppear:(BOOL)animated

{

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

    [self.view addSubview:spriteView];

    

    SKScene *scene = [[PitchingScene alloc] initWithSize:spriteView.frame.size];

    [spriteView presentScene:scene];

}

@end