/// <summary>
/// Animates an object along bezier curve within set duration.
/// </summary>
private static IEnumerator BezierCoroutine(Action <float> animatePropertyAction, BezierCurve curve, float duration)
{
// ReSharper disable once CompareOfFloatsByEqualityOperator
if (duration == 0f)
{
duration = 0.00001f;
Debug.Log("Division by zero prevented");
}
var passedTime = 0f;
while (passedTime < duration)
{
passedTime += Time.deltaTime;
var t = Mathf.Clamp01(passedTime / duration);
// Cubic bezier curve:
// B(t) = (1-t)^3 * P0 + 3(1-t)^2t * P1 + 3(1-t)t^2 * P2 + t^3 * P3 , 0 < t < 1
animatePropertyAction(Mathf.Pow(1 - t, 3) * curve.P0 + 3 * Mathf.Pow(1 - t, 2) * t * curve.P1 + 3 * (1 - t) * Mathf.Pow(t, 2) * curve.P2 + Mathf.Pow(t, 3) * curve.P3);
yield return(new WaitForEndOfFrame());
}
animatePropertyAction(curve.P3);
}
/// <summary>
/// Moves an object along y-axis in bezier curve within set duration.
/// </summary>
internal static IEnumerator MoveYCoroutine(RectTransform transform, BezierCurve curve, float duration)
{
var pos = transform.anchoredPosition;
yield return(BezierCoroutine(t => transform.anchoredPosition = new Vector2(pos.x, t), curve, duration));
}
