怎么在MAPX里面实现鼠标移动的时候画线 急~~~

Question

            if (mapMode == MapMode.Distance) //如果是测量距离
            {
                if (Pins != null && Pins.Length > 0)
                {
                    DPoint dPoint1 = positionTransform.ToMapLocation(Pins[Pins.Length - 1].Longitude, Pins[Pins.Length - 1].Latitude);
                    DPoint dPoint2;
                    //将显示坐标转为地图坐标
                    transForm.FromDisplay(mouseCurrentPosition, out dPoint2);
                    distance = mainCs.Distance(DistanceType.Cartesian, DistanceUnit.Mile, dPoint1, dPoint2);
                    //System.Drawing.Graphics graphics;
                    //System.Drawing.Pen pen = new System.Drawing.Pen(System.Drawing.Color.Black, 2);
                    //graphics.DrawLine(pen,Pins[Pins.Length - 1].DisplayPosition,mouseCurrentPosition);
                    DPoint[] points = new DPoint[2];
                    points[0] = dPoint1;
                    points[1] = dPoint2;
                    if (distanceKey != null)
                    {
                        this.Invoke(new DeleteFeatureDelegate(pinTable.DeleteFeature), new object[] { distanceKey });
                        distanceKey = null;
                    }  
                    Feature f = new Feature(new MultiCurve(mainCs, CurveSegmentType.Linear, points), lineStyle);
                    distanceKey = (Key)this.Invoke(new InsertFeatureDelegate(pinTable.InsertFeature), new object[] { f });
                    label_distance.Text = "总距离：" + aDistance.ToString() + "米 " + "当前距离:" + distance.ToString() + "米";
                }            }问题已经搞定  希望对来看的兄弟有用 多多指点