public Geometry GetGeometry()
{
OSGeo.OGR.Geometry geo2 = new OSGeo.OGR.Geometry(OSGeo.OGR.wkbGeometryType.wkbLinearRing);
// 2 1
// 3 4
geo2.AddPoint(MaxX, MaxY, 0);
geo2.AddPoint(MinX, MaxY, 0);
geo2.AddPoint(MinX, MinY, 0);
geo2.AddPoint(MaxX, MinY, 0);
OSGeo.OGR.Geometry poly2 = new Geometry(wkbGeometryType.wkbPolygon);
poly2.AddGeometryDirectly(geo2);
return(poly2);
}
public static void WriteVectorFile(string strVectorFile)
{
Gdal.AllRegister();
// 为了支持中文路径，请添加下面这句代码
OSGeo.GDAL.Gdal.SetConfigOption("GDAL_FILENAME_IS_UTF8", "NO");
// 为了使属性表字段支持中文，请添加下面这句
OSGeo.GDAL.Gdal.SetConfigOption("SHAPE_ENCODING", "");
//string strVectorFile = @"C:\Users\Administrator\Desktop\shptest\TestPolygon.shp";
// 注册所有的驱动
Ogr.RegisterAll();
//创建数据，这里以创建ESRI的shp文件为例
string strDriverName = "ESRI Shapefile";
OSGeo.OGR.Driver oDriver = Ogr.GetDriverByName(strDriverName);
if (oDriver == null)
{
MessageBox.Show("%s 驱动不可用！\n", strVectorFile);
return;
}
// 创建数据源
DataSource oDS = oDriver.CreateDataSource(strVectorFile, null);
if (oDS == null)
{
MessageBox.Show("创建矢量文件【%s】失败！\n", strVectorFile);
return;
}
// 创建图层，创建一个多边形图层，这里没有指定空间参考，如果需要的话，需要在这里进行指定
Layer oLayer = oDS.CreateLayer("TestPolygon", null, wkbGeometryType.wkbPolygon, null);
if (oLayer == null)
{
MessageBox.Show("图层创建失败！\n");
return;
}
// 下面创建属性表
// 先创建一个叫FieldID的整型属性
FieldDefn oFieldID = new FieldDefn("FieldID", FieldType.OFTInteger);
oLayer.CreateField(oFieldID, 1);
// 再创建一个叫FeatureName的字符型属性，字符长度为50
FieldDefn oFieldName = new FieldDefn("FieldName", FieldType.OFTString);
oFieldName.SetWidth(100);
oLayer.CreateField(oFieldName, 1);
FeatureDefn oDefn = oLayer.GetLayerDefn();
// 创建三角形要素
Feature oFeatureTriangle = new Feature(oDefn);
oFeatureTriangle.SetField(0, 0);
oFeatureTriangle.SetField(1, "三角形");
Geometry geomTriangle = Geometry.CreateFromWkt("POLYGON ((0 0,20 0,10 15,0 0))");
oFeatureTriangle.SetGeometry(geomTriangle);
oLayer.CreateFeature(oFeatureTriangle);
// 创建矩形要素
Feature oFeatureRectangle = new Feature(oDefn);
oFeatureRectangle.SetField(0, 1);
oFeatureRectangle.SetField(1, "矩形");
Geometry geomRectangle = Geometry.CreateFromWkt("POLYGON ((30 0,60 0,60 30,30 30,30 0))");
oFeatureRectangle.SetGeometry(geomRectangle);
oLayer.CreateFeature(oFeatureRectangle);
// 创建岛要素
Feature oFeatureHole = new Feature(oDefn);
oFeatureHole.SetField(0, 1);
oFeatureHole.SetField(1, "环岛测试");
//Geometry geomWYX = Geometry.CreateFromWkt("POLYGON ((30 0,60 0,60 30,30 30,30 0))");
OSGeo.OGR.Geometry outGeo = new OSGeo.OGR.Geometry(OSGeo.OGR.wkbGeometryType.wkbLinearRing);
outGeo.AddPoint(40, -30, 0);
outGeo.AddPoint(60, -30, 0);
outGeo.AddPoint(60, -10, 0);
outGeo.AddPoint(40, -10, 0);
OSGeo.OGR.Geometry inGeo = new OSGeo.OGR.Geometry(OSGeo.OGR.wkbGeometryType.wkbLinearRing);
inGeo.AddPoint(45, -25, 0);
inGeo.AddPoint(55, -25, 0);
inGeo.AddPoint(55, -15, 0);
inGeo.AddPoint(45, -15, 0);
OSGeo.OGR.Geometry geo = new OSGeo.OGR.Geometry(OSGeo.OGR.wkbGeometryType.wkbPolygon);
geo.AddGeometryDirectly(outGeo);
geo.AddGeometryDirectly(inGeo);
oFeatureHole.SetGeometry(geo);
oLayer.CreateFeature(oFeatureHole);
// 创建Multi要素
Feature oFeatureMulty = new Feature(oDefn);
oFeatureMulty.SetField(0, 1);
oFeatureMulty.SetField(1, "MultyPart测试");
OSGeo.OGR.Geometry geo1 = new OSGeo.OGR.Geometry(OSGeo.OGR.wkbGeometryType.wkbLinearRing);
geo1.AddPoint(25, -10, 0);
geo1.AddPoint(5, -10, 0);
geo1.AddPoint(5, -30, 0);
geo1.AddPoint(25, -30, 0);
OSGeo.OGR.Geometry poly1 = new Geometry(wkbGeometryType.wkbPolygon);
poly1.AddGeometryDirectly(geo1);
OSGeo.OGR.Geometry geo2 = new OSGeo.OGR.Geometry(OSGeo.OGR.wkbGeometryType.wkbLinearRing);
geo2.AddPoint(0, -15, 0);
geo2.AddPoint(-5, -15, 0);
geo2.AddPoint(-5, -20, 0);
geo2.AddPoint(0, -20, 0);
OSGeo.OGR.Geometry poly2 = new Geometry(wkbGeometryType.wkbPolygon);
poly2.AddGeometryDirectly(geo2);
OSGeo.OGR.Geometry geoMulty = new OSGeo.OGR.Geometry(OSGeo.OGR.wkbGeometryType.wkbMultiPolygon);
geoMulty.AddGeometryDirectly(poly1);
geoMulty.AddGeometryDirectly(poly2);
oFeatureMulty.SetGeometry(geoMulty);
oLayer.CreateFeature(oFeatureMulty);
MessageBox.Show("\n数据集创建完成！\n");
}
//将内存中一个图层的数据另存为在文件中
private Boolean SaveAsToFile(String name, String path)
{
Ogr.RegisterAll();
//to support chinese path
OSGeo.GDAL.Gdal.SetConfigOption("GDAL_FILENAME_IS_UTF8", "NO");
//to support chinese field name
OSGeo.GDAL.Gdal.SetConfigOption("SHAPE_ENCODING", "");
string strDriverName = "ESRI Shapefile";
Driver oDriver = Ogr.GetDriverByName(strDriverName);
if (oDriver == null)
{
//说明driver不可用
return(false);
}
String pathPrefix = System.IO.Path.GetDirectoryName(path);
String pathPostfix = System.Guid.NewGuid().ToString();
if (File.Exists(pathPrefix + "\\" + pathPostfix))
{
File.Delete(pathPrefix + "\\" + pathPostfix);
}
//create a datasource, if successfully, a shp file would be created
DataSource oDs = oDriver.CreateDataSource(pathPrefix + "\\" + pathPostfix, null);
Schema tmpSchema = this.featureSources[name].schema;
Layer layer = oDs.CreateLayer(name, tmpSchema.rs.spetialReference, tmpSchema.geometryType, null);
//insert all the fields to layer
//use index instead of field name to avoid the error caused by chinese words
int fieldcount = tmpSchema.fields.Count;
for (int i = 0; i < fieldcount; ++i)
{
layer.CreateField(tmpSchema.fields.ElementAt(i).Value, 1);
}
FeatureDefn fdef = layer.GetLayerDefn();
FeatureCollection fc = this.featureSources[name].features;
int fcount = fc.count;
for (int i = 0; i < fcount; ++i)
{
GisSmartTools.Data.Feature tmpFeature = fc.featureList[i];
if (!tmpFeature.visible)
{
continue;
}
//create a new feature
OSGeo.OGR.Feature newFeature = new OSGeo.OGR.Feature(fdef);
//set attribute
newFeature.SetFID(tmpFeature.featureID);
for (int j = 0; j < fieldcount; ++j)
{
String fieldname = tmpSchema.fields.ElementAt(j).Key;
FieldType ft = tmpSchema.fields[fieldname].GetFieldType();
try{
switch (ft)
{
case FieldType.OFTString:
newFeature.SetField(j, (String)tmpFeature.attributes[fieldname]);
break;
case FieldType.OFTInteger:
newFeature.SetField(j, (int)tmpFeature.attributes[fieldname]);
break;
case FieldType.OFTReal:
newFeature.SetField(j, (double)tmpFeature.attributes[fieldname]);
break;
case FieldType.OFTWideString:
newFeature.SetField(j, (String)tmpFeature.attributes[fieldname]);
break;
default:
newFeature.SetField(j, (String)tmpFeature.attributes[fieldname]);
break;
}
}catch (Exception e)
{
}
}
//get geometry
OSGeo.OGR.wkbGeometryType featType = tmpFeature.geometry.geometryType;
OSGeo.OGR.Geometry geo = new OSGeo.OGR.Geometry(featType);
if (geo != null)
{
switch (featType)
{
case OSGeo.OGR.wkbGeometryType.wkbPoint:
GisSmartTools.Geometry.PointD tmpPoint = (GisSmartTools.Geometry.PointD)tmpFeature.geometry;
geo.AddPoint(tmpPoint.X, tmpPoint.Y, 0.00);
break;
case OSGeo.OGR.wkbGeometryType.wkbLineString:
GisSmartTools.Geometry.SimplePolyline tmpLine = (GisSmartTools.Geometry.SimplePolyline)tmpFeature.geometry;
foreach (GisSmartTools.Geometry.PointD po in tmpLine.points)
{
geo.AddPoint(po.X, po.Y, 0.00);
}
break;
case wkbGeometryType.wkbMultiLineString:
GisSmartTools.Geometry.Polyline lines = (GisSmartTools.Geometry.Polyline)tmpFeature.geometry;
foreach (SimplePolyline line in lines.childPolylines)
{
OSGeo.OGR.Geometry tmpgeo = new OSGeo.OGR.Geometry(OSGeo.OGR.wkbGeometryType.wkbLineString);
foreach (GisSmartTools.Geometry.PointD point in line.points)
{
tmpgeo.AddPoint(point.X, point.Y, 0.00);
}
geo.AddGeometryDirectly(tmpgeo);
}
break;
case OSGeo.OGR.wkbGeometryType.wkbPolygon:
GisSmartTools.Geometry.SimplePolygon gon = (GisSmartTools.Geometry.SimplePolygon)tmpFeature.geometry;
foreach (SimplePolyline ring7 in gon.rings)
{
OSGeo.OGR.Geometry tmpgeo = new OSGeo.OGR.Geometry(OSGeo.OGR.wkbGeometryType.wkbLinearRing);
foreach (GisSmartTools.Geometry.PointD point in ring7.points)
{
tmpgeo.AddPoint(point.X, point.Y, 0.00);
}
geo.AddGeometryDirectly(tmpgeo);
}
break;
case wkbGeometryType.wkbMultiPolygon:
GisSmartTools.Geometry.Polygon gons = (GisSmartTools.Geometry.Polygon)tmpFeature.geometry;
foreach (GisSmartTools.Geometry.SimplePolygon cgon in gons.childPolygons)
{
OSGeo.OGR.Geometry geogon = new OSGeo.OGR.Geometry(OSGeo.OGR.wkbGeometryType.wkbPolygon);
foreach (GisSmartTools.Geometry.SimplePolyline ring6 in cgon.rings)
{
OSGeo.OGR.Geometry geoline = new OSGeo.OGR.Geometry(OSGeo.OGR.wkbGeometryType.wkbLinearRing);
foreach (GisSmartTools.Geometry.PointD point6 in ring6.points)
{
geoline.AddPoint(point6.X, point6.Y, 0.00);
}
geogon.AddGeometryDirectly(geoline);
}
geo.AddGeometryDirectly(geogon);
}
break;
default:
break;
}
}
//set feature
newFeature.SetGeometry(geo);
//add to layer
layer.CreateFeature(newFeature);
}
//call Dispose method to save to file
oDs.Dispose();
DataSource tds;
if (this.iDses.TryGetValue(path, out tds))
{
tds.Dispose();
this.iDses.Remove(path);
}
//enumerate all the files in the temp file directory and move them to the output directory
string[] tmpName = System.IO.Directory.GetFiles(pathPrefix + "\\" + pathPostfix);
foreach (string file in tmpName)
{
string decFile = pathPrefix + "\\" + Path.GetFileName(file);
if (File.Exists(decFile))
{
File.Delete(decFile);
}
File.Move(file, decFile);
}
Directory.Delete(pathPrefix + "\\" + pathPostfix, true);
return(true);
}