How can I translate my game object from a certain coordinate to the negative values of the same coordinate?

Questions & Answers
1

I want to create a game similar to Loop Mania on the iPhone App Store. For this, I am calling upon Vector2 and using trigonometric functions which move my object in a circle. However, I want the object to translate to the negative values of the coordinates in a straight line when the left button on a mouse is clicked. For example, if my object is at (2, 3) at a certain point in time, I want it to translate in a straight line to (-2, -3). This is my code so far. I appreciate any and all help.

    private float x, y, a, b;
    private float timeCounter;
    private float speed;
    private float slope;
    private Vector2 targetPosition;

    private void Start ()
    {
        x = 2.95f;
        y = 0f;
        timeCounter = 0f;
        speed = 2.5f;
    }

    //Updates x and y coordinates of the circle
    private void Update()
    {
        timeCounter += Time.deltaTime * speed;

        x = Mathf.Cos(timeCounter) * 2.95f;
        y = Mathf.Sin(timeCounter) * 2.95f;

        a = -x;
        b = -y;

        transform.position = new Vector2(x, y);
        targetPosition = new Vector2(a, b);

        translateAcross();
    }

    private void translateAcross()
    {
        if(Input.GetMouseButtonDown(0))
        {
            transform.position = Vector3.MoveTowards(transform.position, targetPosition, timeCounter);
         }
    }
2

It is probably easier to use Unity’s built-in functions:

private float angularSpeed;
private float speed;
private Vector2 targetPosition;

private void Start()
{
	this.angularSpeed = 100.0f;
	this.speed = 10.0f;
	this.transform.position = new Vector2(0, 2.95f);
	this.targetPosition = this.transform.position;
}

//Updates x and y coordinates of the circle
private void Update()
{
	if (Vector2.Distance(transform.position, targetPosition) < 0.0001f)
	{
		this.transform.RotateAround(Vector2.zero, Vector3.forward, Time.deltaTime * this.angularSpeed);
		this.targetPosition = this.transform.position;
	}
	else
	{
		this.transform.position = Vector2.MoveTowards(this.transform.position, this.targetPosition, Time.deltaTime * this.speed);
	}

	if (Input.GetMouseButtonDown(0))
	{
		this.targetPosition = -this.transform.position;
	}
}

Some additional notes:

  • There is already a built-in variable that does what you are doing with timeCounter, it is Time.time (except when you want to save the time for a specific object)
  • Input.GetMouseButtonDown only gets called once in the frame in which the mouse button is pressed (which was part of your problem)