Gmap.net绘制矩形

Gmap.net鼠标拖动绘制矩形

private GMapOverlay polygons = new GMapOverlay(“polygon”); //放置polygon的图层
private GMapPolygon drawingPolygon = null; //正在画的polygon
private List drawingPoints = new List(); //多边形的点集
private GMapPolygon currentPolygon;
mapControl.Overlays.add(polygons);