public override float Ease(float time)
{
Vector2 prevPoint = Vector2.Zero;
EasePoint usePoint = _points[0];
for (int i = 0; i < _points.Count; i++)
{
usePoint = _points[i];
if (time <= usePoint.Point.X)
{
break;
}
prevPoint = usePoint.Point;
}
float dist = usePoint.Point.X - prevPoint.X;
float progress = (time - prevPoint.X) / dist;
return(MathHelper.Lerp(prevPoint.Y, usePoint.Point.Y, usePoint.Function.Ease(progress)));
}
public void AddPoint(Vector2 vector, EaseFunction function)
{
if (vector.X > 1f || vector.X < 0f)
{
throw new ArgumentException("X value of point is not in valid range!");
}
EasePoint newPoint = new EasePoint(vector, function);
if (_points.Count == 0)
{
_points.Add(newPoint);
return;
}
EasePoint last = _points[_points.Count - 1];
if (last.Point.X > vector.X)
{
throw new ArgumentException("New point has an x value less than the previous point when it should be greater or equal");
}
_points.Add(newPoint);
}