ぽんぽん

ボールを転がして棒をポンポン弾ませる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 PonScene : SKScene

@end

@implementation PonScene

– (void)didMoveToView:(SKView *)view

{

    [self createFloor];

    [self createPonBars];

    [self createBall];

    [self createForceLevelBar];

}

– (void)createFloor

{

    SKSpriteNode *floor = [SKSpriteNode spriteNodeWithColor:[SKColor whiteColor] size:CGSizeMake(CGRectGetMaxX(self.frame), 2)];

    floor.name = @”floor”;

    floor.position = CGPointMake(CGRectGetMidX(self.frame), 30);

    [self addChild:floor];

    

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

    floor.physicsBody.dynamic = NO;

}

– (void)createPonBars

{

    SKNode *floor = [self childNodeWithName:@”floor”];

    

    for (int i=0; i<10; i++) {

        float x = 35 * i + 150;

        float y = 105;

        SKNode *ponBar = [SKNode node];

        ponBar.position = CGPointMake(x, y);

        [self addChild:ponBar];

        

        UIBezierPath *barPath = [UIBezierPath bezierPathWithRect:CGRectMake(-15, –40, 30, 80)];

        SKShapeNode *bar = [SKShapeNode node];

        bar.path = barPath.CGPath;

        [ponBar addChild:bar];

        

        UIBezierPath *circlePath = [UIBezierPath bezierPathWithArcCenter:CGPointMake(0, –40) radius:15 startAngle:0 endAngle:M_PI clockwise:NO];

        [circlePath closePath];

        SKShapeNode *circle = [SKShapeNode node];

        circle.path = circlePath.CGPath;

        [ponBar addChild:circle];

        ponBar.physicsBody = [SKPhysicsBody bodyWithPolygonFromPath:circlePath.CGPath];

        ponBar.physicsBody.density = 0.1;

        

        SKPhysicsJointSliding *s = [SKPhysicsJointSliding jointWithBodyA:ponBar.physicsBody bodyB:floor.physicsBody anchor:ponBar.position axis:CGVectorMake(0, 1)];

        [self.physicsWorld addJoint:s];

        s.shouldEnableLimits = YES;

        s.upperDistanceLimit = 0;

        s.lowerDistanceLimit = –100;

        

    }

}

– (void)createBall

{

    UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:CGPointZero radius:15 startAngle:0 endAngle:2*M_PI clockwise:YES];

    SKShapeNode *ball = [SKShapeNode node];

    ball.name = @”ball”;

    ball.path = path.CGPath;

    ball.position = CGPointMake(40, 50);

    [self addChild:ball];

    

    ball.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:15];

}

– (void)createForceLevelBar

{

    UIBezierPath *path = [UIBezierPath bezierPath];

    [path moveToPoint:CGPointMake(-20, 80)];

    [path addLineToPoint:CGPointMake(0, –80)];

    [path addLineToPoint:CGPointMake(20, 80)];

    [path closePath];

    

    SKShapeNode *levelbar = [SKShapeNode node];

    levelbar.name = @”levelbar”;

    levelbar.position = CGPointMake(40, 180);

    levelbar.path = path.CGPath;

    [self addChild:levelbar];

}

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

{

    CGPoint p = [[touches anyObject] locationInNode:self];

    

    SKNode *levelbar = [self childNodeWithName:@”levelbar”];

    if ([levelbar containsPoint:p]) {

        SKNode *ball = [self childNodeWithName:@”ball”];

        [ball.physicsBody applyImpulse:CGVectorMake(pow(p.y / 40, 2) , 0)];

    }

    

}

-(void)didSimulatePhysics

{

    SKNode *ball = [self childNodeWithName:@”ball”];

    if ((ball.position.x != 40 && fabs(ball.physicsBody.velocity.dx) < 0.1) || ball.position.x > 500) {

        [ball removeFromParent];

        [self createBall];

    }

}

@end

@interface ViewController ()

@end

@implementation ViewController

– (void)viewDidAppear:(BOOL)animated

{

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

    [self.view addSubview:spriteView];

    

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

    [spriteView presentScene:scene];

}

@end