////////////Template code
//////////// Chunk 1 


static const CGFloat kTrackPointsPerSecond = 1000;


-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    const CGRect touchRegion = CGRectMake(0, 0, self.size.width, self.size.height * 0.3);
    
    for (UITouch *touch in touches) {
        CGPoint p = [touch locationInNode:self];
        
        if (CGRectContainsPoint(touchRegion, p)) {
            self.motivatingTouch = touch;
        }
    }
    
    [self trackPaddlesToMotivatingTouches];
}

-(void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    [self trackPaddlesToMotivatingTouches];
}

-(void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    if ([touches containsObject:self.motivatingTouch])
        self.motivatingTouch = nil;
}

-(void)touchesCancelled:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    if ([touches containsObject:self.motivatingTouch])
        self.motivatingTouch = nil;
}

- (void)trackPaddlesToMotivatingTouches
{
    SKNode *node = [self childNodeWithName:@"Paddle"];
    
    UITouch *touch = self.motivatingTouch;
    if (!touch)
        return;
    
    CGFloat xPos = [touch locationInNode:self].x;
    NSTimeInterval duration = ABS(xPos - node.position.x) / kTrackPointsPerSecond;
    [node runAction:[SKAction moveToX:xPos duration:duration]];
}