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POUnderstanding SpriteKit : Moving Sprites
 

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    <p>This is my first post and I am trying to use Apple's <code>SpriteKit</code> framework.</p> <p>I believe I have a misunderstanding of how to move sprites using the framework. I have a simple example where I would like to move a <code>hero</code> in a simple <code>UP</code>, <code>DOWN</code>, <code>LEFT</code>, <code>RIGHT</code> direction based on the a tap location, respective to the "hero" location. Once the hero hits a <code>block</code> the "hero" should stop.</p> <p>For testing purposes I am just trying to tap above the "hero" hit the wall of blocks on the top of the screen. Then after the collision occurs, tap below the "hero". I was expecting the "hero" to move toward the wall of blocks on the bottom row; however it seem that the "hero" continues to move UP and through the top wall. I am sure I am making a fundamental flaw, I would appreciate any help. </p> <p>Thanks </p> <p>Here is the sample scene I wrote:</p> <pre><code>static inline CGPoint CGPointSubtract(const CGPoint a, const CGPoint b) { return CGPointMake(a.x - b.x, a.y - b.y); } typedef enum DIRECTION_e { UP, DOWN, LEFT, RIGHT } DIRECTION_t; typedef NS_OPTIONS(uint32_t, CNPhysicsCategory) { PhysicsCategoryBlock = 1 &lt;&lt; 0, PhysicsCategoryHero = 1 &lt;&lt; 1 }; @interface LevelScene () @property (nonatomic) SKSpriteNode * hero; @property (nonatomic) BOOL inMotion; @end @implementation LevelScene -(id) initWithSize:(CGSize)size { if (self = [super initWithSize:size]) { self.physicsWorld.gravity = CGVectorMake(0,0); self.physicsWorld.contactDelegate = self; [self createLevel]; [self createHero]; self.inMotion = NO; } return self; } - (void) createHero { [self addHeroAtRow:5 column:2]; } - (void) createLevel { self.backgroundColor = [SKColor blackColor]; self.scaleMode = SKSceneScaleModeAspectFit; [self addBlockAtRow:1 column:1]; [self addBlockAtRow:1 column:2]; [self addBlockAtRow:1 column:3]; [self addBlockAtRow:10 column:1]; [self addBlockAtRow:10 column:2]; [self addBlockAtRow:10 column:3]; } - (void) addBlockAtRow:(NSInteger)row column:(NSInteger)column { SKSpriteNode *block = [[SKSpriteNode alloc] initWithColor:[SKColor brownColor] size:CGSizeMake(64,64)]; block.position = CGPointMake(32 + (column * 64), 32 + ((11-row) * 64)); block.name = @"block"; block.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:block.size]; block.physicsBody.dynamic = NO; block.physicsBody.categoryBitMask = PhysicsCategoryBlock; block.physicsBody.collisionBitMask = PhysicsCategoryBlock | PhysicsCategoryHero; block.physicsBody.contactTestBitMask = PhysicsCategoryBlock | PhysicsCategoryHero; [self addChild:block]; } - (void) addHeroAtRow:(NSInteger)row column:(NSInteger)column { self.hero = [[SKSpriteNode alloc] initWithColor:[SKColor redColor] size:CGSizeMake(64,64)]; self.hero.position = CGPointMake(32 + (column * 64), 32 + ((11-row) * 64)); self.hero.name = @"hero"; self.hero.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:CGSizeMake(self.hero.size.width/2, self.hero.size.height/2)]; self.hero.physicsBody.usesPreciseCollisionDetection = YES; self.hero.physicsBody.dynamic = YES; self.hero.physicsBody.categoryBitMask = PhysicsCategoryHero; self.hero.physicsBody.collisionBitMask = PhysicsCategoryHero | PhysicsCategoryBlock; self.hero.physicsBody.contactTestBitMask = PhysicsCategoryHero | PhysicsCategoryBlock; [self addChild:self.hero]; NSLog(@"ADDING HERO: %f, %f", self.hero.position.x, self.hero.position.y); } - (void)didBeginContact:(SKPhysicsContact *)contact { if (contact.bodyA.categoryBitMask == PhysicsCategoryBlock &amp;&amp; contact.bodyB.categoryBitMask == PhysicsCategoryHero) { [self.hero removeAllActions]; self.hero.position = contact.bodyB.node.position; NSLog(@"COLLISION: %f, %f", self.hero.position.x, self.hero.position.y); self.inMotion = NO; } else if (contact.bodyB.categoryBitMask == PhysicsCategoryBlock &amp;&amp; contact.bodyA.categoryBitMask == PhysicsCategoryHero) { [self.hero removeAllActions]; self.hero.position = contact.bodyA.node.position; NSLog(@"COLLISION: %f, %f", self.hero.position.x, self.hero.position.y); self.inMotion = NO; } } - (void) moveHeroTowardDirection:(DIRECTION_t)direction { CGPoint location; switch (direction) { case UP: { location = CGPointMake(self.hero.position.x, self.hero.position.y + 600); } break; case DOWN: { location = CGPointMake(self.hero.position.x, self.hero.position.y + -600); } break; case LEFT: { location = CGPointMake(self.hero.position.x + -600, self.hero.position.y); } break; case RIGHT: { location = CGPointMake(self.hero.position.x + 600, self.hero.position.y); } break; default: return; } NSLog(@"MOVE POSITION: %f, %f", location.x, location.y); SKAction *action = [SKAction moveTo:location duration:10]; [self.hero runAction:action]; } -(void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { if (self.inMotion) return; self.inMotion = YES; UITouch *touch = [touches anyObject]; CGPoint touchLocation = [touch locationInView:self.view]; CGPoint diff = CGPointSubtract(self.hero.position, touchLocation); NSLog(@"TOUCH POSITION: %f, %f", touchLocation.x, touchLocation.y); NSLog(@"HERO POSITION: %f, %f", self.hero.position.x, self.hero.position.y); NSLog(@"DIFF POSITION: %f, %f", diff.x, diff.y); // // Magnitude to find out which direction is dominate // if (abs(diff.x) &gt; abs(diff.y)) { if (touchLocation.x &gt; self.hero.position.x) { NSLog(@"LEFT"); [self moveHeroTowardDirection:LEFT]; } else { NSLog(@"RIGHT"); [self moveHeroTowardDirection:RIGHT]; } } else { if (touchLocation.y &lt; self.hero.position.y) { NSLog(@"UP"); [self moveHeroTowardDirection:UP]; } else { NSLog(@"DOWN"); [self moveHeroTowardDirection:DOWN]; } } } @end </code></pre>
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    1. COthis will help http://stackoverflow.com/questions/19172140/skaction-move-forward/19172574#19172574
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    2. CO@Smick wonderful. Thank you
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    3. CO@Smick I would like to give you credit for the answer. What is the best way to do that? Sorry I am new here.
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