in your game scene in your shootptojectiletowardsposition function, when you call your projectileatposition function from your projectile node class make sure you are using "machine.position.x" which gives you the x value of the center of the machine. Remember, the atposition functions in your game scene allow you to set a staring position for your nodes. I will let you figure out the y now.

Let me know if you need some more help

JMc

Hi Jonathan,

Thank you so much for your reply, still not working, not sure what i have done.

here are the code what i have done.

• (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { for (UITouch *touch in touches) { CGPoint position = [touch locationInNode:self]; [self ShootProjectileTowardsPosition:position]; }

}

• (void) ShootProjectileTowardsPosition:(CGPoint)position { THSpaceCatNode spaceCat = (THSpaceCatNode)[self childNodeWithName:@"SpaceCat"]; [spaceCat performTap];

  THMachineNode *machine = (THMachineNode *)[self childNodeWithName:@"machine"];

  THProjectileNode *projectile = [THProjectileNode projectileAtPosition:CGPointMake (machine.position.x, machine.position.y+machine.frame.size.height-15)]; [self addChild:projectile]; [projectile MoveTowardsPosition:position];

lets see your projectile node code, you may be overriding the position when you create the skspritenode

would you like me to email my project file?

import "THProjectileNode.h"

@implementation THProjectileNode

• (instancetype) projectileAtPosition: (CGPoint)position { THProjectileNode *Projectile = [self spriteNodeWithImageNamed:@"projectile_1"]; Projectile.position = position; Projectile.name = @"Projectile";

  [Projectile setupAnimation];

  return Projectile;

}

• (void) setupAnimation { NSArray *textures = @[[SKTexture textureWithImageNamed:@"projectile_1"], [SKTexture textureWithImageNamed:@"projectile_2"], [SKTexture textureWithImageNamed:@"projectile_3"]]; SKAction *animation = [SKAction animateWithTextures:textures timePerFrame:0.1]; SKAction *repeatAction = [SKAction repeatActionForever:animation]; [self runAction:repeatAction];

}

• (void) MoveTowardsPosition:(CGPoint)position { // slope = (Y3 - Y1) / (X3 - X1) float slope = (position.y - self.position.y) / (position.x - self.position.x);

  // slope = (Y2 - Y1) / (X2 - X1) // Y2 - Y1 = slope ( X2 - X1 ) // Y2 = slope * X2 - slope * X1 + Y1

  float offscreenX;

  if ( position.x <= self.position.x ) { offscreenX = -10; } else { offscreenX = self.parent.frame.size.width + 10; }

  float offscreenY = slope * offscreenX - slope * self.position.x + self.position.y;

  CGPoint pointOffscreen = CGPointMake(offscreenX, offscreenY);

  float distanceA = pointOffscreen.y - self.position.y; float distanceB = pointOffscreen.x - self.position.x;

  float distanceC = sqrtf(powf(distanceA, 2) + powf(distanceB, 2));

  // distance = speed * time // time = distance / speed

  float time = distanceC / 400;

  SKAction *moveProjectile = [SKAction moveTo:pointOffscreen duration:time]; [self runAction:moveProjectile];

}

Mate thank you so much, this never come to my mind, even in the video has lower m* it's working fine now.

No worries, if it cannot find your child node it stuffs it in the 0,0 value. Another thing you can do when you have this trouble is to NSLog your nodes to see where they exist on the screen.

Glad I could be of help. I actually think i had this problem too but I blocked it out....lol

Cheers to your continued success in IOS development!