随机化矢量（路径查找器）

Question

我正在尝试随机化我的路径搜索器代码。目前，运行以下代码的sprite将移向目标。但是，我希望抛射物略微高于或低于目标。我尝试改变我的矢量点，但它似乎没有工作。有什么建议吗？

//从怪物到目标获取矢量         CGPoint vectorToTarget = vectorSubtract（self.target.position，projectile.position）;

    CGPoint randomVector = CGPointMake(vectorToTarget.x + ((int)arc4random_uniform(51) - 25), vectorToTarget.y + ((int)arc4random_uniform(51) - 25));

    //Make unit vector
    CGPoint direction = vectorNormalize(randomVector);

    CGPoint shootDistance = vectorMultiplyByScalar(direction, self.screenSize.height+self.screenSize.width);
    CGPoint actualDistance = vectorAdd(shootDistance, self.position);

    float velocity = 100.0/1.0;
    float time = self.screenSize.width / velocity;

    SKAction *actionMove = [SKAction moveTo:actualDistance duration:time];