/// <summary>
/// 移除图层
/// </summary>
/// <param name="layer">图层</param>
public void RemoveLayer(Layer layer)
{
int index = _Layers.IndexOf(layer);
_Layers.Remove(layer);
_DataSet.Tables.Remove(layer.Records);
_TreeNode.Nodes.Remove(layer.Node);
LayerRemoved?.Invoke(this, layer);
MapPerformaceChanged?.Invoke(this);//重绘一级地图
}
/// <summary>
/// 改变图层顺序
/// </summary>
/// <param name="layer">图层</param>
/// <param name="index">新位置索引</param>
public void ChangeLayerSequence(Layer layer, int index)
{
int mOldIndex = _Layers.IndexOf(layer);
if (mOldIndex == index)
{
return;
}
else if (mOldIndex > index)
{
_Layers.Remove(layer);
_Layers.Insert(index, layer);
}
else
{
_Layers.Insert(index, layer);
_Layers.Remove(layer);
}
LayerSequenceChanged?.Invoke(this, layer);
MapPerformaceChanged?.Invoke(this);//重绘一级地图
}
//投影信息改变了
private void _PrjSystem_ProjectedSystemChanged(object sender)
{
foreach (Layer sLayer in _Layers)
{
//计算投影
bool sRead = sLayer.ReadOnly;
sLayer.ReadOnly = false;
if (sLayer.GeoType == typeof(PointD))
{
PointD sPoint;
foreach (DataRow mRow in sLayer.Records.Rows)
{
sPoint = mRow.Field <PointD>(1);
if (sPoint != null)
{
mRow[2] = _PrjSystem.ToProjCo(sPoint);
}
}
}
else if (sLayer.GeoType == typeof(MultiPolyLine))
{
MultiPolyLine sMultiPolyLine;
foreach (DataRow mRow in sLayer.Records.Rows)
{
sMultiPolyLine = mRow.Field <MultiPolyLine>(1);
if (sMultiPolyLine != null)
{
mRow[2] = _PrjSystem.ToProjCo(sMultiPolyLine);
}
}
}
else if (sLayer.GeoType == typeof(MultiPolygon))
{
MultiPolygon sMultiPolygon;
foreach (DataRow mRow in sLayer.Records.Rows)
{
sMultiPolygon = mRow.Field <MultiPolygon>(1);
if (sMultiPolygon != null)
{
mRow[2] = _PrjSystem.ToProjCo(sMultiPolygon);
}
}
}
Geometry sGeo;
foreach (DataRow mRow in sLayer.Records.Rows)
{
if (!Convert.IsDBNull(mRow[2]))
{
sGeo = (Geometry)mRow[2];
mRow[3] = LayerTools.GetCenterPoint(sGeo);
}
}
sLayer.MBR = LayerTools.GetLayerGeoMBR(sLayer);
sLayer.PRJMBR = _PrjSystem.ToProjCo(sLayer.MBR);
sLayer.Records.AcceptChanges(); //保存更改
sLayer.GenerateIndex(); //计算地理索引
MapPerformaceChanged?.Invoke(this); //重绘一级地图
sLayer.ReadOnly = sRead;
}
}
private void Layer_SymbolChanged(object sender)
{
MapPerformaceChanged?.Invoke(this);//重绘一级地图
LayerSymbolChanged?.Invoke(sender);
}
private void Layer_VisiblityChanged(object sender, bool visible)
{
//LayerVisiblityChanged(this, (Layer)sender);//图层可见性改变，通知其它控件
MapPerformaceChanged?.Invoke(this);//重绘一级地图
}
/// <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
}
