/// <summary>
/// 添加图层
/// </summary>
/// <param name="layer">图层</param>
public void AddLayer(Layer layer)
{
//计算投影
if (layer.GeoType == typeof(PointD))
{
PointD sPoint;
foreach (DataRow mRow in layer.Records.Rows)
{
sPoint = mRow.Field <PointD>(1);
if (sPoint != null)
{
mRow[2] = _PrjSystem.ToProjCo(sPoint);
}
}
}
else if (layer.GeoType == typeof(MultiPolyLine))
{
MultiPolyLine sMultiPolyLine;
foreach (DataRow mRow in layer.Records.Rows)
{
sMultiPolyLine = mRow.Field <MultiPolyLine>(1);
if (sMultiPolyLine != null)
{
mRow[2] = _PrjSystem.ToProjCo(sMultiPolyLine);
}
}
}
else if (layer.GeoType == typeof(MultiPolygon))
{
MultiPolygon sMultiPolygon;
foreach (DataRow mRow in layer.Records.Rows)
{
sMultiPolygon = mRow.Field <MultiPolygon>(1);
if (sMultiPolygon != null)
{
mRow[2] = _PrjSystem.ToProjCo(sMultiPolygon);
}
}
}
Geometry sGeo;
foreach (DataRow mRow in layer.Records.Rows)
{
if (!Convert.IsDBNull(mRow[2]))
{
sGeo = (Geometry)mRow[2];
mRow[3] = LayerTools.GetCenterPoint(sGeo);
}
}
if (layer.MBR == null)
{
layer.MBR = LayerTools.GetLayerGeoMBR(layer);
}
layer.PRJMBR = _PrjSystem.ToProjCo(layer.MBR);
layer.Records.AcceptChanges(); //保存更改
layer.GenerateIndex(); //计算地理索引
//将地图数据锁住，不允许修改
layer.ReadOnly = true;
layer.VisiblityChanged += Layer_VisiblityChanged;
layer.SymbolChanged += Layer_SymbolChanged;
layer.RecordsChanged += Layer_RecordsChanged;
_Layers.Insert(0, layer);
if (_DataSet.Tables.Contains(layer.Name))
{
layer.Name += "_";
}
_DataSet.Tables.Add(layer.Records);
_TreeNode.Nodes.Insert(0, layer.Node);
LayerAdded?.Invoke(this, layer); //通知外部已经添加了图层
MapPerformaceChanged?.Invoke(this); //重绘一级地图
}
