Map中实现 矩形框跟随鼠标移动
1按钮实现选择是自定义画矩形框还是指定大小的矩形框：
//在矩形中分两种：1 地图上画矩形 2 指定宽高
switch (DrawingInfo.Draw_rectWay)
{
case RectWay.RectDraw:
{
_mapControl.Action = SuperAction.CreateRectangle;
}
break;
case RectWay.RectCustm:
{
//画自定义矩形
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 画指定大小的矩形框：
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的偏移点
/// </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，鼠标移动事件：
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;//这句很重要
}
}
4， mapcontrol动作光标改变事件：
this._mapControl.ActionCursorChanging += _mapControl_ActionCursorChanging;
void _mapControl_ActionCursorChanging(object sender, ActionCursorChangingEventArgs e)
{
if (isMoveRect)
{
e.FollowingCursor = Cursors.Cross;
}
}
5 变量的声明。这一步其实该放第一位，忘了。所以补上：
private bool isMoveRect = false;
private Point pnt_before;
private Rectangle2D rect_move;
mapcontrol属性：
this._mapControl.IsWaitCursorEnabled = false;
this._mapControl.TrackMode = TrackMode.Track;