Map中實現 矩形框跟隨滑鼠移動

Map中實現 矩形框跟隨滑鼠移動

1按鈕實現選擇是自訂畫矩形框還是指定大小的矩形框：

//在矩形中分兩種：1 地圖上畫矩形 2 指定寬高

switch (DrawingInfo.Draw_rectWay)

{

    case RectWay.RectDraw:

        {

            _mapControl.Action = SuperAction.CreateRectangle;

        }

        break;

    case RectWay.RectCustm:

        {

            //畫自訂矩形

            double w = DrawingInfo.Draw_rectWidth;

            double h = DrawingInfo.Draw_rectHeight;

            pnt_before = m_map.MapToPixel(m_map.Center);

            Rectangle2D rect = new Rectangle2D(m_map.Center, new Size2D(w, h));

            _mapControl.Action = SuperAction.Null;

            _mapControl.Cursor = Cursors.Cross;

            DrawCustomerRect(rect);

            isMoveRect = true;

        }

        break;

    default:

        break;

}

 

2 畫指定大小的矩形框：

private void DrawCustomerRect(Rectangle2D rect)

{

    rect_move = rect;

    _mapControl.Cursor = Cursors.Cross;

    double x = rect.Left;

    double y = rect.Top;

    double dblWidth = rect.Width;

    double dblHeight = rect.Height;

    Point2Ds points = new Point2Ds();

    Point2D pntLeftTop = new Point2D(x, y);

    Point2D pntLeftBottom = new Point2D(x, y - dblHeight);

    Point2D pntRightBottom = new Point2D(x + dblWidth, y - dblHeight);

    Point2D pntRightTop = new Point2D(x + dblWidth, y);

    points.Add(pntLeftTop);

    points.Add(pntLeftBottom);

    points.Add(pntRightBottom);

    points.Add(pntRightTop);

    points.Add(pntLeftTop);

    GeoLine rectLine = new GeoLine();

    rectLine.AddPart(points);

    GeoStyle rectangleStyle = new GeoStyle();

    rectangleStyle.LineColor = Color.FromArgb(255, 0, 0);

    rectangleStyle.LineWidth = 0.5;

    rectLine.Style = rectangleStyle;

    int moveRectIndex = m_map.TrackingLayer.IndexOf("CustRect");

    if (moveRectIndex >= 0)

    {

        m_map.TrackingLayer.Remove(moveRectIndex);

    }

    m_map.TrackingLayer.Add(rectLine, "CustRect");

    m_map.RefreshTrackingLayer();

}

/// <summary>

/// point2D的位移點

/// </summary>

/// <param name="point"></param>

/// <param name="dx"></param>

/// <param name="dy"></param>

/// <returns></returns>

private Point2D OffsetPoint(Point2D point, double dx, double dy)

{

    point.Offset(dx, dy);

    return point;

}

 

3，滑鼠移動事件：

private void _mapControl_MouseMove(object sender, MouseEventArgs e)

{

    if (isMoveRect)

    {

        Point2D pnt2DBeforeMove = m_map.PixelToMap(pnt_before);

        Point2D pnt2DAfterMove = m_map.PixelToMap(e.Location);

        double dx = pnt2DAfterMove.X - pnt2DBeforeMove.X;

        double dy = pnt2DAfterMove.Y - pnt2DBeforeMove.Y;

        rect_move = new Rectangle2D(OffsetPoint(new Point2D(rect_move.Left, rect_move.Top), dx, dy),

                                    OffsetPoint(new Point2D(rect_move.Right, rect_move.Bottom), dx, dy));

        DrawCustomerRect(rect_move);

        pnt_before = e.Location;//這句很重要

    }

}

 

4， mapcontrol動作游標改變事件：

 this._mapControl.ActionCursorChanging += _mapControl_ActionCursorChanging;

void _mapControl_ActionCursorChanging(object sender, ActionCursorChangingEventArgs e)

{

    if (isMoveRect)

    {

        e.FollowingCursor = Cursors.Cross;

    }

}

 

5 變數的聲明。這一步其實該放第一位，忘了。所以補上：

        private bool isMoveRect = false;

        private Point pnt_before;

        private Rectangle2D rect_move;

mapcontrol屬性：

this._mapControl.IsWaitCursorEnabled = false;

this._mapControl.TrackMode = TrackMode.Track;