Unity Mobile - How to make fluid swipe to move movement? - unity3d

Question

So I am working on a personal project, and I had this idea for a movement that I don't know to realize. So the project(game) is for phone, and what I want to, is to when I swap in a direction, that vector becomes its closest axis (ex: 70 degrees will be (0,1) while 35 will be (1,0)). So when I get a swipe, I want my character to move in that direction. MAIN ISSUE is I don't know how to make him dash to that location. I know how to make him TELEPORT, but not how to make him DASH. I tried going for Vector2.Lerp, but it is a bit buggy and feels like character does not react on time. Here is the script:
private void Update()
{
if (gameObject.GetComponent<OnDeath>().isDead == false)
{
if (trigger)
{
fractionOfWayThere += 0.1f;
transform.position=Vector2.Lerp(transform.position, finish, fractionOfWayThere);
isMoving = true;
}
if ((Vector2)transform.position == finish)
{
isMoving = false;
animator.SetBool("isMoving", false);
}
if (Input.touchCount > 0)
{
Touch touch = Input.GetTouch(0);
if (touch.phase == TouchPhase.Began)
{
startPos = cam.ScreenToWorldPoint(touch.position);
}
if (touch.phase == TouchPhase.Ended)
{
endPos = cam.ScreenToWorldPoint(touch.position);
destination = endPos - startPos;
if (Mathf.Abs(destination.x) > Mathf.Abs(destination.y))
{
destination = new Vector2(Funkcija(destination.x), 0);
}
if (Mathf.Abs(destination.x) < Mathf.Abs(destination.y))
{
destination = new Vector2(0, Funkcija(destination.y));
}
if (Mathf.Abs(destination.x) == Mathf.Abs(destination.y))
{
destination = new Vector2(Funkcija(destination.x), 0);
}
finish = (Vector2)transform.position + destination.normalized;
if (Physics2D.OverlapCircle(finish, 0.1f, spike) != null)
{
if (finish.x < transform.position.x)
{
sr.flipX = true;
}
else if (finish.x > transform.position.x)
sr.flipX = false;
trigger = true;
fractionOfWayThere = 0;
isMoving = true;
animator.SetBool("isMoving", true);
}
else
{
finish = transform.position;
}
}
}
}
}
Most of the code is getting the swipe into its axis and flipping sprite, only thing regarding the movement is this:
if (trigger)
{
fractionOfWayThere += 0.1f;
transform.position=Vector2.Lerp(transform.position, finish, fractionOfWayThere);
isMoving = true;
}
Playtesting, this feels realy weird. I tried Vector2.MovePosition(), rb.AddForce() and rb.MovePosition. Any other way to do this, or even using those functionts I have not thought of? All feedback would be highly appreciated!

Answer 1

Lerp is a good Start, but it's linear. A Dash would typically start instantly and slow down over time.
to achieve framerate independent movement, you should use Time.deltaTime in Update. It's neglectable in FixedUpdate as these occur at (almost) fixed timesteps.
You can achieve that by adding an AnimationCurve to your code:
[...]
public AnimationCurve dashCurve = new AnimationCurve.Linear(0,0,1,1); // modify this in inspector!
[...]
if (trigger)
{
fractionOfWayThere += 0.5f * Time.deltaTime; // fractionOfWayThere takes 0.5 second to grow from 0 to 1.
transform.position = Vector2.Lerp(transform.position, finish, dashCurve.Evaluate(fractionOfWayThere));
isMoving = true;
}
Set up the AnimationCurve like this: