Fps player controler with joystick with touch field

public const float FPS_SPEED = 10.0f;
public const float MOUSE_SENSITIVITY = 1.0f;
public const float TOUCH_SENSITIVITY = 15.0f;
public const float JOYSTICK_SENSITIVITY = 15.0f;
private const float JOYSTICK_DEAD = 0.1f;

private const char TOUCH_FIELD_MOVE = 'L';
private const char TOUCH_FIELD_LOOK = 'R';


public void ProcessInputs()
    {
        var x = 0f;
        var y = 0f;
        var z = 0f;

        if (Input.GetKey(KeyCode.W))
        {
            z += 1;
        }

        if (Input.GetKey(KeyCode.S))
        {
            z -= 1;
        }

        if (Input.GetKey(KeyCode.A))
        {
            x -= 1;
        }

        if (Input.GetKey(KeyCode.D))