使用 GMap.net 在地图上绘制多段线

Draw a polyline on the map using GMap.net

是的,我不是第一个提问的人,但我没有找到答案(也许是因为我的英语不好)。如何在地图上绘制折线?不是路线(方向),而只是一条折线,就像在 JS Google 地图 API 中具有折线功能。看不懂。

谢谢。

好好阅读本教程:

http://www.independent-software.com/gmap-net-tutorial-maps-markers-and-polygons/

这应该让你开始:

GMapOverlay polyOverlay = new GMapOverlay("polygons");
IList<PointLatLng> points = new List<PointLatLng>();
points.Add(new PointLatLng(-25.969562,32.585789));
points.Add(new PointLatLng(-25.966205,32.588171));
GMapPolygon polygon = new GMapPolygon(points, "mypolygon");
polygon.Fill = new SolidBrush(Color.FromArgb(50, Color.Red));
polygon.Stroke = new Pen(Color.Red, 1);
polyOverlay.Polygons.Add(polygon);
gmap.Overlays.Add(polyOverlay);

虽然有点矫枉过正,但您可以使用 GMap 路线功能绘制简单的线条。这还有一个主要优点,即它可以让您在必要时确定该线的长度(以公里为单位)。以下是绘制单线的方法:

GMapRoute line_layer;
GMapOverlay line_overlay

line_layer = new GMapRoute("single_line");
line_layer.Stroke = new Pen(Brushes.Black, 2); //width and color of line

line_overlay.Routes.Add(line_layer);
gMapControl1.Overlays.Add(line_overlay)

//Once the layer is created, simply add the two points you want

line_layer.Points.Add(new PointLatLng(lat, lon));
line_layer.Points.Add(new PointLatLng(lat2, lon2));

//Note that if you are using the MouseEventArgs you need to use local coordinates and convert them:
line_layer.Points.Add(gMapControl1.FromLocalToLatLng(e.X, e.Y));

//To force the draw, you need to update the route
gMapControl1.UpdateRouteLocalPosition(line_layer);

//you can even add markers at the end of the lines by adding markers to the same layer:

GMapMarker marker_ = new GMarkerCross(p);
line_overlay.Markers.Add(marker_);