两点间插值函数

当我订阅在MouseMove事件的时候得到的点并不是等坐标距离的，也不是按像素的，为了让动画更加自然，需要用到两点间的线性插值。

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private List<Point> LinearInterpolated(List<Point> trackPoints) {     List<Point> result = new List<Point>();     Point start = trackPoints[0];     for (int i = 1; i < trackPoints.Count; i++)     {         Point end = trackPoints[i];           var distance = Math.Floor(Math.Sqrt(Math.Pow((start.X - end.X), 2) + Math.Pow((start.Y - end.Y), 2)));         //Debug.WriteLine("distance:" + distance.ToString());           if (distance > 1)         {             var step = 1 / distance;             var startRatio = 0.0;             Point prePosition = start;             for (int j = 0; j < distance; j++)             {                 startRatio += step;                 Point r = Point.Empty;                   r.X = Convert.ToInt32(Math.Round(start.X + (end.X - start.X) * startRatio, 0));                 r.Y = Convert.ToInt32(Math.Round(start.Y + (end.Y - start.Y) * startRatio, 0));                   if (r != prePosition)                 {                     result.Add(r);                     prePosition = r;                 }             }         }           start = end;     }       return result; }