void RefreshRateX()
 {
     xTime = 0;
     lastX = 0;
     if (maxVelocity.x == 0)
     {
         sDistance.x = 0;
     }
     else
     {
         sDistance.x = (float)MathH.PowDistance(DecayRateX, maxVelocity.x, 1000000);
     }
 }
 void RefreshRateY()
 {
     yTime = 0;
     lastY = 0;
     if (maxVelocity.y == 0)
     {
         sDistance.y = 0;
     }
     else
     {
         sDistance.y = (float)MathH.PowDistance(DecayRateY, maxVelocity.y, 1000000);
     }
 }
        static void DuringSlide(EventCallBack back)
        {
            if (back.mVelocity.x == 0 & back.mVelocity.y == 0)
            {
                return;
            }
            back.xTime += UserAction.TimeSlice;
            back.yTime += UserAction.TimeSlice;
            float x = 0, y = 0;
            bool  endx = false, endy = false;

            if (back.mVelocity.x != 0)
            {
                float t = (float)MathH.PowDistance(back.DecayRateX, back.maxVelocity.x, back.xTime);
                x          = t - back.lastX;
                back.lastX = t;
                float vx = Mathf.Pow(back.DecayRateX, back.xTime) * back.maxVelocity.x;
                if (vx <0.001f& vx> -0.001f)
                {
                    back.mVelocity.x = 0;
                    endx             = true;
                }
                else
                {
                    back.mVelocity.x = vx;
                }
            }
            if (back.mVelocity.y != 0)
            {
                float t = (float)MathH.PowDistance(back.DecayRateY, back.maxVelocity.y, back.yTime);
                y          = t - back.lastY;
                back.lastY = t;
                float vy = Mathf.Pow(back.DecayRateY, back.yTime) * back.maxVelocity.y;
                if (vy <0.001f& vy> -0.001f)
                {
                    back.mVelocity.y = 0;
                    endy             = true;
                }
                else
                {
                    back.mVelocity.y = vy;
                }
            }
            if (back.Scrolling != null)
            {
                back.Scrolling(back, new Vector2(x, y));
            }
            if (endx)
            {
                if (back.ScrollEndX != null)
                {
                    back.ScrollEndX(back);
                }
            }
            if (endy)
            {
                if (back.ScrollEndY != null)
                {
                    back.ScrollEndY(back);
                }
            }
        }