/// <summary>
/// 将wkb对象转换为Geometry对象
/// </summary>
/// <param name="wkb"></param>
/// <returns></returns>
public static IGeometry ConvertWkbToGeometry(byte[] wkb)
{
IGeometry geom;
int countin = wkb.GetLength(0);
IGeometryFactory3 factory = new GeometryEnvironment() as IGeometryFactory3;
factory.CreateGeometryFromWkbVariant(wkb, out geom, out countin);
return(geom);
}
private void button1_Click(object sender, EventArgs e)
{
//当确定按钮被点击时
//连接数据库，路径规划
//string sqlstr = "select ST_asbinary(ST_Union(geom)) as route from pgr_fromAtoB('whu_road_feature2line'::text,114.353,30.539,114.367,30.544) ;";
string sqlstr = null;
if ((startX * startY * endX * endY) != 0)
{
sqlstr = "select ST_asbinary(ST_Union(geom)) as route from pgr_fromAtoB('whu_road_feature2line'::text," + startX + "," + startY + "," + endX + "," + endY + ") ;";
}
else
{
MessageBox.Show("起始点或终止点不能为空");
return;
}
Byte[] routeWKB = DAO.executeRouteQuery(sqlstr);
IGeometry geom;
int countin = routeWKB.GetLength(0);
//地图容器，创建临时元素
IMap pMap = mMapControl.Map;
IActiveView pActiveView = pMap as IActiveView;
IGraphicsContainer pGraphicsContainer = pMap as IGraphicsContainer;
if (pElement != null)
{
pGraphicsContainer.DeleteElement(pElement);
}
//转换wkb为IGeometry
IGeometryFactory3 factory = new GeometryEnvironment() as IGeometryFactory3;
factory.CreateGeometryFromWkbVariant(routeWKB, out geom, out countin);
IPolyline pLine = (IPolyline)geom;
//定义要素symbol
ISimpleLineSymbol pLineSym = new SimpleLineSymbol();
IRgbColor pColor = new RgbColor();
pColor.Red = 11;
pColor.Green = 120;
pColor.Blue = 233;
pLineSym.Color = pColor;
pLineSym.Style = esriSimpleLineStyle.esriSLSSolid;
pLineSym.Width = 2;
//线元素symbol绑定
ILineElement pLineElement = new LineElementClass();
pLineElement.Symbol = pLineSym;
//添加geom
pElement = pLineElement as IElement;
pElement.Geometry = pLine;
//加入地图并刷新
pGraphicsContainer.AddElement(pElement, 0);
pActiveView.Refresh();
//object symbol = pLineSym as object;
//mMapControl.DrawShape(pLine, ref symbol);
}
/// <summary>
///
/// </summary>
/// <param name="dbGeometry"></param>
/// <returns></returns>
public static IGeometry dbGeometryToGeometry(DbGeometry dbGeometry)
{
if (dbGeometry == null)
{
return(null);
}
byte[] wkb = dbGeometry.AsBinary();
IGeometry geomOut = new GeometryBag();
IGeometryFactory gf = new GeometryEnvironment() as IGeometryFactory;
int readCount = 0;
gf.CreateGeometryFromWkbVariant(wkb, out geomOut, out readCount);
return(geomOut);
}
private void LoadFeatureclass(IFeatureClass featureclass)
{
try
{
SpatialLiteDB db = new SpatialLiteDB(this.DatabasePath);
db.Open();
string sql = "SELECT AsBinary(" + Table.GeometryColumnName + ") as wkb,* FROM " + this.TableName;
using (SQLiteCommand command = new SQLiteCommand(sql, db.SQLiteDatabaseConn))
{
using (SQLiteDataAdapter adapter = new SQLiteDataAdapter(command))
{
System.Data.DataTable table = new System.Data.DataTable();
adapter.Fill(table);
IFeatureCursor cursor = featureclass.Insert(true);
foreach (DataRow row in table.Rows)
{
IFeatureBuffer feature = featureclass.CreateFeatureBuffer();
for (int i = 0; i < feature.Fields.FieldCount; i++)
{
IField field = feature.Fields.get_Field(i);
Debug.WriteLine("FieldName=" + field.Name);
if (field.Type != esriFieldType.esriFieldTypeGeometry
& !field.Name.Equals("wkb", StringComparison.CurrentCultureIgnoreCase)
& !field.Name.Equals("name", StringComparison.CurrentCultureIgnoreCase)
& !field.Name.Equals(featureclass.OIDFieldName, StringComparison.CurrentCultureIgnoreCase))
{
try
{
Debug.WriteLine("Spatialite Field Value: " + row[field.Name].ToString());
feature.set_Value(i, row[field.Name]);
}
catch (Exception ex)
{
Trace.WriteLine(ex.StackTrace);
}
}
else if (field.Type == esriFieldType.esriFieldTypeGeometry)
{
byte[] wkb = (byte[])row["wkb"];
int bytesRead;
object missing = Type.Missing;
IGeometry outGeometry;
object byteArrayObject = row["wkb"];
IGeometryFactory3 factory = new GeometryEnvironment() as IGeometryFactory3;
factory.CreateGeometryFromWkbVariant(byteArrayObject, out outGeometry, out bytesRead);
if (outGeometry != null)
{
try
{
feature.Shape = outGeometry;
}
catch (Exception ex)
{
Trace.WriteLine(ex.StackTrace);
}
}
}
}
cursor.InsertFeature(feature);
}
}
}
db.Close();
}
catch (Exception ex)
{
Trace.WriteLine(ex.StackTrace);
throw;
}
}