/// <summary>
/// Occurs when this command is clicked
/// </summary>
public override void OnClick()
{
string name = NetWorkAnalysClass.getPath(path) + "\\data\\HuanbaoGeodatabase.gdb"; //得到数据库文件路径
IFeatureWorkspace pFWorkspace = NetWorkAnalysClass.OpenWorkspace(name) as IFeatureWorkspace; //打开要素工作空间
//"RouteNetwork","BaseData"参数不可更改
networkDataset = NetWorkAnalysClass.OpenPathNetworkDataset(pFWorkspace as IWorkspace,
"RouteNetwork", "BaseData"); //打开网络数据集
m_NAContext = NetWorkAnalysClass.CreatePathSolverContext(networkDataset); //通过网络数据集创建网络分析上下文
inputFClass = pFWorkspace.OpenFeatureClass("Stops"); //根据名字打开站点要素类
barriesFClass = pFWorkspace.OpenFeatureClass("Barries"); //根据名字打开障碍点要素类
if (IFLayerExist("NetworkDataset") == false) //若不存在NetworkDataset图层就执行
{
//创建名为“NetworkDataset”的图层
ILayer layer;
INetworkLayer networkLayer;
networkLayer = new NetworkLayerClass();
networkLayer.NetworkDataset = networkDataset;
layer = networkLayer as ILayer;
layer.Name = "NetworkDataset";
m_hookHelper.ActiveView.FocusMap.AddLayer(layer);
layer.Visible = false;
}
//检查是否存在名为“Route”的图层。若存在则删除
if (IFLayerExist(m_NAContext.Solver.DisplayName) == true)
{
for (int i = 0; i < m_hookHelper.FocusMap.LayerCount; i++)
{
if (m_hookHelper.FocusMap.get_Layer(i).Name == m_NAContext.Solver.DisplayName)
{
m_hookHelper.FocusMap.DeleteLayer(m_hookHelper.FocusMap.get_Layer(i));
}
}
}
INALayer naLayer = m_NAContext.Solver.CreateLayer(m_NAContext);
ILayer pLayer = naLayer as ILayer;
pLayer.Name = m_NAContext.Solver.DisplayName;
m_hookHelper.ActiveView.FocusMap.AddLayer(pLayer);//往当前地图中添加该图层
int featureCount = inputFClass.FeatureCount(null); //得到站点要素类中要素的个数
if (featureCount < 2) //若少于两个则不能进行分析
{
MessageBox.Show("只有一个站点，不能进行路径分析！");
return;
}
IGPMessages gpMessages = new GPMessagesClass();//定义一个地理处理结果信息返回对象
//加载站点要素，并设置容差
NetWorkAnalysClass.LoadNANetworkLocations("Stops", inputFClass, m_NAContext, 80);
//加载障碍点要素，并设置容差
NetWorkAnalysClass.LoadNANetworkLocations("Barriers", barriesFClass, m_NAContext, 50);
INASolver naSolver = m_NAContext.Solver;//创建网络分析对象
try
{
naSolver.Solve(m_NAContext, gpMessages, null);//执行最短路径分析
}
catch (Exception ex)
{
MessageBox.Show("未能找到有效路径" + ex.Message, "提示",
MessageBoxButtons.OKCancel, MessageBoxIcon.Warning);
return;
}
//将“Routes”图层组下的“Stops”、“Point Barriers”图层设为不可见
for (int i = 0; i < m_hookHelper.FocusMap.LayerCount; i++)
{
if (m_hookHelper.FocusMap.get_Layer(i).Name == m_NAContext.Solver.DisplayName)
{
//ICompositeLayer Interface Provides access to members that work with a collection of layers that behaves like a single layer.
//CompositeLayer为图层组类型
ICompositeLayer pCompositeLayer = m_hookHelper.FocusMap.get_Layer(i) as ICompositeLayer;
for (int t = 0; t < pCompositeLayer.Count; t++)
{
ILayer pResultLayer = pCompositeLayer.get_Layer(t);
if (pResultLayer.Name == "Stops" || pResultLayer.Name == "Point Barriers")
{
pResultLayer.Visible = false;
continue;
}
}
}
}
//接下来将地图的视图范围缩放至最短路径的显示范围
IGeoDataset geoDataset; //地理数据集
IEnvelope envelope; //最小边界矩形
geoDataset = m_NAContext.NAClasses.get_ItemByName("Routes") as IGeoDataset;
//The IGeoDataset::Extent property returns an envelope representing the maximum extent of data which has been stored in the dataset.
envelope = geoDataset.Extent;
if (!envelope.IsEmpty)
{
envelope.Expand(1.1, 1.1, true);
}
//将地图的显示的范围设置为“Routes”图层的数据范围
m_hookHelper.ActiveView.Extent = envelope;
//刷新视图
m_hookHelper.ActiveView.Refresh();
//获取最短路径“Routes”要素
ITable table = m_NAContext.NAClasses.get_ItemByName("Routes") as ITable;
ICursor cursor = table.Search(null, false);
IRow row = cursor.NextRow();
for (int i = 0; i < table.Fields.FieldCount; i++)
{
if (table.Fields.get_Field(i).AliasName == "Total_Shape_Length")
{
//获取最短路径的总长度
total_Length_str = row.get_Value(i).ToString();
}
}
}
