Understanding SpriteKit : Moving Sprites - ios

Question

This is my first post and I am trying to use Apple's SpriteKit framework.
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 hero in a simple UP, DOWN, LEFT, RIGHT direction based on the a tap location, respective to the "hero" location. Once the hero hits a block the "hero" should stop.
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.
Thanks
Here is the sample scene I wrote:
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 << 0,
PhysicsCategoryHero = 1 << 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 && 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 && 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) > abs(diff.y))
{
if (touchLocation.x > self.hero.position.x)
{
NSLog(#"LEFT");
[self moveHeroTowardDirection:LEFT];
}
else
{
NSLog(#"RIGHT");
[self moveHeroTowardDirection:RIGHT];
}
}
else
{
if (touchLocation.y < self.hero.position.y)
{
NSLog(#"UP");
[self moveHeroTowardDirection:UP];
}
else
{
NSLog(#"DOWN");
[self moveHeroTowardDirection:DOWN];
}
}
}
#end

Answer 1

Here try this, you need to remove/disable your touches ended as well
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
for (UITouch *touch in touches) {
for (UITouch *touch in touches) {
CGPoint location = [touch locationInNode:self];
CGPoint diff = CGPointMake(location.x - self.hero.position.x, location.y - self.hero.position.y);
CGFloat angleRadians = atan2f(diff.y, diff.x);
[self.hero runAction:[SKAction sequence:#[
[SKAction rotateToAngle:angleRadians duration:1.0],
[SKAction moveByX:diff.x y:diff.y duration:3.0]
]]];
}
}
}