使用C#中的操纵杆来控制对象

现在我正在使用WASD键来控制一个对象。现在我想用操纵杆来做同样的事情。有人能告诉我如何调整我的代码来做到这一点吗？我想做的就是用一个if（Input）空间替换if（Input.getKey）空间，该空间将使用操纵杆左右移动船。

void drive()
{
    //decrease speed
    if (Input.GetKeyDown(KeyCode.S))
    {
        //in Drive
        if (acceleration > 0 && 
            bucketMode == false)
        {
            acceleration-= 250;
        }
        //in Reverse
        else if (acceleration < 0 &&
            bucketMode == true)
        {
            acceleration += 250;
        }
    }
   //Increases Speed 
   if (Input.GetKeyDown(KeyCode.W))
    {
        //in Drive
        if (acceleration < maxSpeed &&
            bucketMode == false)
        {
            acceleration+= 250;
        }
        //in Reverse
        else if (acceleration > minSpeed &&
            bucketMode == true)
        {
            acceleration -= 250;
        }
    }
    //stops the boat and toggles Bucket mode
    if (Input.GetKeyDown(KeyCode.Space))
    {
        acceleration = 0;
        if (bucketMode == false)
        {
            //goes into revers
            bucketMode = true;
            craft.bucket(1); //sends bucket as true
        }
        else
        {
            //goes into drive
            bucketMode = false;
            craft.bucket(0);  //sends bucket as false
        }
    }
    //moves forward if speed is +
    if (acceleration < 0)
    {
        //moves backwards at half the speed than in drive, in a smooth motion, speed depending on user input(acceleration)
        this.transform.Translate(Vector3.left * Time.smoothDeltaTime * ((-acceleration / 500) +1));
        //updates craft speed being displayed
        craft.ChangeSpeed((acceleration/500) * 1.94);
    }
    //moves backward if speed is -
    else if (acceleration > 0)
    {
        //moves forward in a smoothb motion, speed depending on user input(acceleration)
        this.transform.Translate(Vector3.right * Time.smoothDeltaTime * ((acceleration / 250) + 1));
        //updates craft speed being displayed
        craft.ChangeSpeed((acceleration/250) * 1.94);
    }
    //stands still if speed is 0
    else
    {           
    }
    //turns right
    if (Input.GetKey(KeyCode.D))
    {
        //turns the boat to the left smoothly, as speed increases, so does turn angle
        this.transform.Rotate(Vector3.forward * Time.smoothDeltaTime * 25 /* ((2 * acceleration / 250) +1)*/);
        //updates boat information(heading and speed)
        craft.ChangeHeading(1 * Time.smoothDeltaTime * 25 /* ((2 * acceleration / 250) +1)*/);
        craft.ChangeSpeed((acceleration/250) * 1.94);
        //if boat is not moving forwards, moves forward slowly, so boat doesn't turn in place
        if (acceleration == 0)
        {
            this.transform.Translate(Vector3.right * Time.smoothDeltaTime / 2);
        }
    }
    //turns left
    if (Input.GetKey(KeyCode.A))
    {
        //turns the boat to the right smoothly, as speed increases, so does turn angle
        this.transform.Rotate(Vector3.back * Time.smoothDeltaTime * 25 /* ((2 * acceleration / 250) +1)*/);
        //updates boat information(heading and speed)
        craft.ChangeHeading(-1 * Time.smoothDeltaTime * 25 /* ((2 * acceleration / 250) +1)*/);
        craft.ChangeSpeed((acceleration/250) * 1.94);
        //if boat is not moving forwards, moves forward slowly, so boat doesn't turn in place
        if (acceleration == 0)
        {
            this.transform.Translate(Vector3.right * Time.smoothDeltaTime / 2);
        }
    }
}