Sudden movement

Unity Engine
,
2

Nobody wants to download and open files… if you post a code snippet, ALWAYS USE CODE TAGS:

How to use code tags: Using code tags properly

You’re welcome to sniff around a very straightforward Rigidbody2D spaceship engine in my Proximity Buttons project.

proximity_buttons is presently hosted at these locations:

https://bitbucket.org/kurtdekker/proximity_buttons

https://github.com/kurtdekker/proximity_buttons

Spaceship2D controller:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class SpaceShip2D : MonoBehaviour
{
    public float RateOfTurn;

    public float MaxSpeed;

    public float Acceleration;
    public float Damping;

    void Reset()
    {
        RateOfTurn = 180;
        MaxSpeed = 10;
        Acceleration = 10;
        Damping = 0.5f;
    }

    Rigidbody2D rb2d;

    void Start()
    {
        rb2d = gameObject.AddComponent<Rigidbody2D>();
        // set to zero if you want not gravity
        rb2d.gravityScale = 0.1f;
    }

    float inputSteer;
    bool inputThrust;

    void UpdateGatherInput()
    {
        inputSteer = 0;
        inputThrust = false;

        inputSteer += -Input.GetAxisRaw( "Horizontal");
        if (Mathf.Abs( Input.GetAxisRaw( "Vertical")) > 0.5f)
        {
            inputThrust = true;
        }

        // TODO: gather other input here

        // gate and normalize steering
        if (Mathf.Abs( inputSteer) < 0.3)
        {
            inputSteer = 0;
        }
        if (inputSteer != 0)
        {
            inputSteer = Mathf.Sign( inputSteer);
        }
    }

    void UpdateSteering()
    {
        if (inputSteer != 0)
        {
            float angle = rb2d.rotation;

            angle += inputSteer * RateOfTurn * Time.deltaTime;

            rb2d.MoveRotation( angle);
        }
    }

    void UpdateThrusting()
    {
        Vector2 forward = rb2d.transform.up;

        Vector2 velocity = rb2d.velocity;

        if (inputThrust)
        {
            velocity += (forward * Acceleration * Time.deltaTime);

            if (velocity.magnitude > MaxSpeed)
            {
                velocity = velocity.normalized * MaxSpeed;
            }
        }

        velocity -= velocity * Damping * Time.deltaTime;

        rb2d.velocity = velocity;
    }

    void FixedUpdate ()
    {
        UpdateGatherInput();

        UpdateSteering();

        UpdateThrusting();
    }
}