一列に並んだブロックを消すシューティングゲームの iPhoneアプリを描いてみます。
#import “ViewController.h”
#import <SpriteKit/SpriteKit.h>
@interface ShootScene : SKScene <SKPhysicsContactDelegate>
@property int direction;
@property int playerMove;
@end
@implementation ShootScene
– (void)didMoveToView:(SKView *)view
{
self.physicsWorld.gravity = CGVectorMake(0, 0);
self.physicsBody = [SKPhysicsBody bodyWithEdgeLoopFromRect:self.view.frame];
self.physicsBody.dynamic = NO;
self.physicsWorld.contactDelegate = self;
self.direction = 1;
[self createPlayer];
[self createBlocks];
[self createButton];
}
– (void)createBlocks
{
for (int i=0; i<7; i++) {
SKSpriteNode *block = [SKSpriteNode spriteNodeWithColor:[SKColor yellowColor] size:CGSizeMake(20, 20)];
block.position = CGPointMake(i * 30 + 40, CGRectGetMaxY(self.frame) – 80);
block.name = @”block”;
[self addChild:block];
block.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:block.size];
block.physicsBody.categoryBitMask = 0x1;
block.physicsBody.contactTestBitMask = 0x1;
SKPhysicsJointSliding *s = [SKPhysicsJointSliding jointWithBodyA:block.physicsBody bodyB:self.physicsBody anchor:block.position axis:CGVectorMake(1, 0)];
[self.physicsWorld addJoint:s];
}
}
– (void)createPlayer
{
SKNode *player = [SKNode node];
player.position = CGPointMake(160, 140);
player.name = @”player”;
[self addChild:player];
SKSpriteNode *partA = [SKSpriteNode spriteNodeWithColor:[SKColor purpleColor] size:CGSizeMake(50, 20)];
partA.position = CGPointMake(0, –10);
[player addChild:partA];
SKSpriteNode *partB = [SKSpriteNode spriteNodeWithColor:[SKColor purpleColor] size:CGSizeMake(20, 30)];
[player addChild:partB];
player.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:CGSizeMake(50, 30)];
SKPhysicsJointSliding *s = [SKPhysicsJointSliding jointWithBodyA:player.physicsBody bodyB:self.physicsBody anchor:player.position axis:CGVectorMake(1, 0)];
[self.physicsWorld addJoint:s];
}
– (void)createButton
{
UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:CGPointZero radius:20 startAngle:0 endAngle:2.0*M_PI clockwise:NO];
for (int i=0; i<3; i++) {
SKShapeNode *btn = [SKShapeNode node];
btn.name = [NSString stringWithFormat:@”button%d”, i];
btn.position = CGPointMake(i * 90 + 70, 40);
btn.path = path.CGPath;
btn.fillColor = [SKColor whiteColor];
[self addChild:btn];
}
}
– (void)update:(NSTimeInterval)currentTime
{
[self enumerateChildNodesWithName:@”block” usingBlock:^(SKNode *node, BOOL *stop) {
node.physicsBody.velocity = CGVectorMake(self.direction * 10, 0);
if (node.position.x > 300) {
self.direction = –1;
} else if (node.position.x < 20) {
self.direction = 1;
}
}];
SKNode *player = [self childNodeWithName:@”player”];
player.physicsBody.velocity = CGVectorMake(self.playerMove * 40, 0);
}
– (void)shoot
{
SKNode *player = [self childNodeWithName:@”player”];
SKSpriteNode *beam = [SKSpriteNode spriteNodeWithColor:[SKColor whiteColor] size:CGSizeMake(2, 7)];
beam.position = CGPointMake(player.position.x, player.position.y + 30);
[self addChild:beam];
beam.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:beam.size];
beam.physicsBody.velocity = CGVectorMake(0, 100);
beam.physicsBody.linearDamping = 0;
beam.physicsBody.allowsRotation = NO;
beam.physicsBody.collisionBitMask = 0x1;
SKAction *act = [SKAction customActionWithDuration:0 actionBlock:^(SKNode *node, CGFloat elapsedTime) {
[beam removeFromParent];
}];
[beam runAction:[SKAction sequence:@[[SKAction waitForDuration:3.0], act]]];
}
– (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
CGPoint p = [[touches anyObject] locationInNode:self];
SKNode *btnL = [self childNodeWithName:@”button0″];
SKNode *btnC = [self childNodeWithName:@”button1″];
SKNode *btnR = [self childNodeWithName:@”button2″];
if ([btnC containsPoint:p]) {
[self shoot];
} else if ([btnL containsPoint:p]) {
self.playerMove = –1;
} else if ([btnR containsPoint:p]) {
self.playerMove = 1;
}
}
– (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
self.playerMove = 0;
}
– (void)didBeginContact:(SKPhysicsContact *)contact
{
SKNode *nodeA = contact.bodyA.node;
SKNode *nodeB = contact.bodyB.node;
SKAction *fade = [SKAction fadeOutWithDuration:0.4];
[nodeA runAction:fade completion:^{
[nodeA removeFromParent];
}];
[nodeB runAction:fade completion:^{
[nodeB removeFromParent];
}];
}
@end
@interface ViewController ()
@end
@implementation ViewController
– (void)viewDidLoad
{
[super viewDidLoad];
SKView *spriteView = [[SKView alloc] initWithFrame:self.view.frame];
[self.view addSubview:spriteView];
SKScene *scene = [[ShootScene alloc] initWithSize:spriteView.frame.size];
[spriteView presentScene:scene];
}
@end