updates scenes: 1,2,3

SKDemo/SKDemo/MyScene1.m

@@ -9,42 +9,54 @@
 #import "MyScene1.h"
 
 @interface MyScene1 ()
-@property (nonatomic) SKSpriteNode *ship;
-@end
 
-static inline CGPoint ADD(const CGPoint a, const CGPoint b) {
-    return CGPointMake(a.x + b.x, a.y + b.y);
-}
+@property (nonatomic) SKSpriteNode *alien;
+
+@end
 
 @implementation MyScene1
 
 -(id)initWithSize:(CGSize)size {    
     if (self = [super initWithSize:size]) {
         NSLog(@"MyScene1: sz=%.1fx%.1f", size.width, size.height);
 
-        self.backgroundColor = [SKColor colorWithRed:0.1 green:0.2 blue:0.3 alpha:1.0];
+        self.backgroundColor = [SKColor colorWithRed:0.1f green:0.1f blue:0.3f alpha:1.0f];
 
-        _ship = [SKSpriteNode spriteNodeWithImageNamed:@"Spaceship"];
-        _ship.position = CGPointMake(0, 0);
-        _ship.xScale = 0.25;
-        _ship.yScale = 0.25;
-        [self addChild:_ship];
+        _alien = [SKSpriteNode spriteNodeWithImageNamed:@"alien1.png"];
+        _alien.position = CGPointMake(0.0f, 0.0f);
+        [self addChild:_alien];
     }
     return self;
 }
 
--(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
-    UITouch *touch = [touches anyObject];
-    CGPoint loc = [touch locationInNode:self];
-    _ship.position = loc;
-}
+#pragma mark - game loop
 
 -(void)update:(CFTimeInterval)currentTime {
-    // 1. Make it move faster, slower, backwards, etc...
-    // 2. Make it get bigger, smaller (xScale, yScale)
-    // 3. Make it rotate (zRotation)
+    //move it
+    _alien.position = CGPointMake(_alien.position.x + 1, _alien.position.y + 1);
+
+    // 1. Make it move faster
+    //_alien.position = CGPointMake(_alien.position.x + 2, _alien.position.y + 2);
+
+    // 2. Make it get bigger, smaller
+    //_alien.xScale = ?
+    //_alien.yScale = ?
+
+    // 3. Make it rotate
+    //_alien.zRotation = ?
+
     // 4. Make it bounce at the edges...
-    _ship.position = ADD(_ship.position, CGPointMake(1,1));
 }
 
-@end
+#pragma mark - touch handler
+
+-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
+    UITouch *touch = [touches anyObject];
+    CGPoint pos = [touch locationInNode:self];
+    NSLog(@"TOUCH: (%.1f,%.1f)", pos.x, pos.y);
+
+    // move alien to touch pos
+    _alien.position = pos;
+}
+
+@end

SKDemo/SKDemo/MyScene2.m

@@ -17,36 +17,53 @@ -(id)initWithSize:(CGSize)size {
     if (self = [super initWithSize:size]) {
         NSLog(@"MyScene2: sz=%.1fx%.1f", size.width, size.height);
 
-        self.backgroundColor = [SKColor colorWithRed:0.2 green:0.3 blue:0.1 alpha:1.0];
+        self.backgroundColor = [SKColor colorWithRed:0.1f green:0.3f blue:0.1f alpha:1.0f];
     }
     return self;
 }
 
+#pragma mark - game loop
+
+-(void)update:(CFTimeInterval)currentTime {
+    //do nothing...
+}
+
+#pragma mark - touch handler
+
 -(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
     UITouch *touch = [touches anyObject];
-    CGPoint loc = [touch locationInNode:self];
+    CGPoint pos = [touch locationInNode:self];
+    NSLog(@"TOUCH: (%.1f,%.1f)", pos.x, pos.y);
 
-    SKSpriteNode *ship = [SKSpriteNode spriteNodeWithImageNamed:@"Spaceship"];
-    ship.position = loc;
-    ship.xScale = 0.2;
-    ship.yScale = 0.2;
-    [self addChild:ship];
+    SKSpriteNode *alien = [SKSpriteNode spriteNodeWithImageNamed:@"alien1.png"];
+    alien.position = pos;
+    [self addChild:alien];
 
-    SKAction *hit = [SKAction playSoundFileNamed:@"fire.wav" waitForCompletion:NO];
-    SKAction *miss = [SKAction playSoundFileNamed:@"miss.wav" waitForCompletion:NO];
-
-    SKAction *move = [SKAction moveByX:-25.0 y:-25.0 duration:1.0];
-    SKAction *rotate = [SKAction rotateByAngle:-M_PI_2 duration:1];
-
-    SKAction *fade = [SKAction fadeOutWithDuration:1.5];
+    SKAction *move = [SKAction moveByX:13.0f y:37.0f duration:0.5f];
+    SKAction *rotate = [SKAction rotateByAngle:-M_PI duration:0.5f];
+    SKAction *fadeOut = [SKAction fadeOutWithDuration:0.5f];
     SKAction *remove = [SKAction removeFromParent];
 
-    // 1. Other actions to try: colorize, fadeIn, repeat, scaleBy, wait
-    [ship runAction:[SKAction sequence:@[
-                                         arc4random_uniform(7) < 5 ? hit : miss,
-                                         [SKAction group:@[move, rotate]],
-                                         fade,
-                                         remove]]];
+    [alien runAction:[SKAction sequence:@[move, rotate, fadeOut, remove]]];
+
+    // Try some other actions...
+
+    // 1. wait
+    //SKAction *wait = [SKaction waitForDuration:1.0f];
+
+    // 2. fadeIn
+    //SKAction *fadeIn = [SKAction fadeInWithDuration:1.0f];
+
+    // 3. scale
+    //SKAction *doubleSize = [SKAction scaleTo:2.0f duration:1.0f];
+    //SKAction *halfSize = [SKAction scaleTo:0.5f duration:1.0f];
+
+    // 4. colorize
+    //SKAction *blue = [SKAction colorizeWithColor:[UIColor blueColor] colorBlendFactor:1.0f duration:1.0f];
+    //SKAction *green = [SKAction colorizeWithColor:[UIColor greenColor] colorBlendFactor:1.0f duration:1.0f];
+
+    // 5. actions in parallel
+    //SKAction *parallel = [SKAction group:@[move,rotate]];
 }
 
-@end
+@end

SKDemo/SKDemo/MyScene3.m

@@ -9,87 +9,69 @@
 #import "MyScene3.h"
 
 @interface MyScene3 ()
+
 @property (nonatomic) SKSpriteNode *alien;
 @property (nonatomic) CGPoint center;
-@property (nonatomic) SKAction *flyAnim;
 @property (nonatomic) SKAction *hit;
 @property (nonatomic) SKAction *miss;
-@end
 
-static inline CGPoint ADD(const CGPoint a, const CGPoint b) {
-    return CGPointMake(a.x + b.x, a.y + b.y);
-}
+@end
 
 @implementation MyScene3
 
 -(id)initWithSize:(CGSize)size {    
     if (self = [super initWithSize:size]) {
         NSLog(@"MyScene3: sz=%.1fx%.1f", size.width, size.height);
 
-        self.backgroundColor = [SKColor colorWithRed:0.3 green:0.1 blue:0.1 alpha:1.0];
+        self.backgroundColor = [SKColor colorWithRed:0.3f green:0.1f blue:0.1f alpha:1.0f];
 
         //init center
-        _center = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame));
+        _center = CGPointMake(size.width * 0.5f, size.height * 0.5f);
 
         //init sounds
         _hit = [SKAction playSoundFileNamed:@"fire.wav" waitForCompletion:NO];
         _miss = [SKAction playSoundFileNamed:@"miss.wav" waitForCompletion:NO];
-
-        //create atlas
-        SKTextureAtlas *atlas = [SKTextureAtlas atlasNamed:@"alien"];
-        SKTexture *a1 = [atlas textureNamed:@"alien1.png"];
-        SKTexture *a2 = [atlas textureNamed:@"alien2.png"];
-        SKTexture *a3 = [atlas textureNamed:@"alien3.png"];
-        SKTexture *a4 = [atlas textureNamed:@"alien4.png"];
-        SKTexture *a5 = [atlas textureNamed:@"alien5.png"];
-        SKTexture *a6 = [atlas textureNamed:@"alien6.png"];
-        SKTexture *a7 = [atlas textureNamed:@"alien7.png"];
-        SKTexture *a8 = [atlas textureNamed:@"alien8.png"];
-        SKTexture *a9 = [atlas textureNamed:@"alien9.png"];
-        SKTexture *a10 = [atlas textureNamed:@"alien10.png"];
-        NSArray *alienFly = @[a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a9,a8,a7,a6,a5,a4,a3,a2,a1];
 
-        //create sprite
-        _alien = [SKSpriteNode spriteNodeWithTexture:a1];
+        //init sprite
+        _alien = [SKSpriteNode spriteNodeWithImageNamed:@"alien1.png"];
         _alien.position = _center;
         [self addChild:_alien];
-
-        //1. Try faster, slower, repeating texture anim
-        _flyAnim = [SKAction animateWithTextures:alienFly timePerFrame:0.1];
     }
     return self;
 }
 
+
+#pragma mark - game loop
+
+-(void)update:(CFTimeInterval)currentTime {
+    //do nothing...
+}
+
+#pragma mark - touch handler
+
 -(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
     UITouch *touch = [touches anyObject];
-    CGPoint loc = [touch locationInNode:self];
+    CGPoint pos = [touch locationInNode:self];
+    NSLog(@"TOUCH: (%.1f,%.1f)", pos.x, pos.y);
 
-    if ([_alien containsPoint:loc]) {
-        //2. Try to adjust positioning for iPhone vs iPad
-        float x = (float)arc4random_uniform(201) - 100.0f;
-        float y = (float)arc4random_uniform(201) - 100.0f;
-        NSLog(@"HIT!: (%.1f,%.1f)", x, y);
+    if ([_alien containsPoint:pos]) {
+        NSLog(@"HIT!");
 
-        SKAction *fadeOut = [SKAction fadeOutWithDuration:0.1];
-        SKAction *fadeIn = [SKAction fadeInWithDuration:0.1];
-        SKAction *move = [SKAction moveTo:ADD(_center, CGPointMake(x,y)) duration:0.1];
-        SKAction *bg = [SKAction runBlock:^{
-            float red = CGColorGetComponents(self.backgroundColor.CGColor)[0] + 0.04f;
-            if (red > 0.8) { red = 0.3f; }
-            self.backgroundColor = [SKColor colorWithRed:red green:0.1 blue:0.1 alpha:1.0];
-        }];
+        //2. How would you adjust positioning for iPhone vs iPad
+
+        //compute the new position
+        CGPoint newPos = CGPointMake(_center.x + arc4random_uniform(201) - 100.0f,
+                                  _center.y + arc4random_uniform(201) - 100.0f);
+
+        SKAction *fadeOut = [SKAction fadeOutWithDuration:0.2f];
+        SKAction *fadeIn = [SKAction fadeInWithDuration:0.2f];
+        SKAction *move = [SKAction moveTo:newPos duration:0.2f];
 
-        [_alien runAction:[SKAction sequence:@[
-                                               _hit,
-                                               fadeOut,
-                                               [SKAction group:@[move,bg]],
-                                               fadeIn,
-                                               _flyAnim]]
-                  withKey:@"ANIM"];
+        [_alien runAction:[SKAction sequence:@[_hit,fadeOut,move,fadeIn]] withKey:@"ANIM"];
     } else {
         NSLog(@"miss");
         [_alien runAction:_miss];
     }
 }
 
-@end
+@end