public string Statistic(string layerName, string fieldName, IMap imap)
{
DataOperator pDo = new DataOperator(imap, null);
IFeatureLayer pFl = (IFeatureLayer)pDo.GetLayerbyName(layerName);
IFeatureClass pFcl = pFl.FeatureClass;
IDataStatistics pDst = new DataStatistics();
IFeatureCursor pFc;
pFc = pFcl.Search(null, false);
ICursor pCs = (ICursor)pFc;
pDst.Cursor = pCs;
pDst.Field = fieldName;
IStatisticsResults StartReasult;
StartReasult = pDst.Statistics;
double dMax, dMin, dMean;
dMax = StartReasult.Maximum;
dMin = StartReasult.Minimum;
dMean = StartReasult.Mean;
string sReasult;
sReasult = "最大面积为" + dMax.ToString() + ";最小面积为" + dMin.ToString() + ";平均面积为" + dMean.ToString();
return(sReasult);
}
public bool Buffer(string layerName, string sWhere, int iSize, IMap imap)
{
IFeatureClass pFcl;
IFeature pF;
IGeometry pGt;
DataOperator pDo = new DataOperator(imap, null);
IFeatureLayer pFl = (IFeatureLayer)pDo.GetLayerbyName(layerName);
pFcl = pFl.FeatureClass;
IQueryFilter pQf = new QueryFilterClass();
pQf.WhereClause = sWhere;
IFeatureCursor pFc;
pFc = (IFeatureCursor)pFcl.Search(pQf, false);
int count = pFcl.FeatureCount(pQf);
pF = pFc.NextFeature();
pGt = pF.Shape;
ITopologicalOperator pTo = (ITopologicalOperator)pGt;
IGeometry pGtBuffer = pTo.Buffer(iSize);
ISpatialFilter pSf = new SpatialFilter();
pSf.Geometry = pGtBuffer;
pSf.SpatialRel = esriSpatialRelEnum.esriSpatialRelIndexIntersects;
IFeatureSelection pFs = (IFeatureSelection)pFl;
pFs.SelectFeatures(pSf, esriSelectionResultEnum.esriSelectionResultNew, false);
return(true);
}
public bool QueryIntersect(string srcLayerName, string tgtLayerName, IMap imap, esriSpatialRelationEnum spatialRel)
{
DataOperator pDo = new DataOperator(imap, null);
//定义并根据图层名称获取图层对象
IFeatureLayer iSrcLayer = new FeatureLayerClass();
iSrcLayer = (IFeatureLayer)pDo.GetLayerbyName(srcLayerName);
IFeatureLayer iTgtLayer = (IFeatureLayer)pDo.GetLayerbyName(tgtLayerName);
//通过查询过滤获取continent层中亚洲几何
IGeometry pGt;
IFeature pF;
IFeatureCursor pFcs;
IFeatureClass pFcl;
IQueryFilter pQf = new QueryFilter();
pQf.WhereClause = "CONTINENT='Asia'";//设置查询条件
pFcs = iTgtLayer.FeatureClass.Search(pQf, false);
pF = pFcs.NextFeature();
pGt = pF.Shape;
try
{
pFcl = iSrcLayer.FeatureClass;
}
catch
{
}
ISpatialFilter pSf = new SpatialFilter();
pSf.Geometry = pGt;
pSf.WhereClause = "POP_RANK=5";//人口等级低于5的城市
pSf.SpatialRel = (ESRI.ArcGIS.Geodatabase.esriSpatialRelEnum)spatialRel;
//定义要素选择对象，以要素搜索图层进行实例化
IFeatureSelection pFs = (IFeatureSelection)iSrcLayer;
//以空间过滤器对要素进行选择，并建立新选择集
try
{
pFs.SelectFeatures(pSf, esriSelectionResultEnum.esriSelectionResultNew, false);
}
catch
{
}
return(true);
}
private void button1_Click(object sender, EventArgs e)
{
double bufferDistance;
double.TryParse(txtBufferDistance.Text, out bufferDistance);
if (0.0 == bufferDistance)
{
MessageBox.Show("距离设置错误", "Error!");
return;
}
if (!System.IO.Directory.Exists(System.IO.Path.GetDirectoryName(txtOutputPath.Text)) || ".shp" != System.IO.Path.GetExtension(txtOutputPath.Text))
{
MessageBox.Show("输出格式错误！");
return;
}
if (comboBoxLayer.Items.Count <= 0)
{
return;
}
DataOperator pDo = new DataOperator(m_map, null);
IFeatureLayer pFl = (IFeatureLayer)pDo.GetLayerbyName(comboBoxLayer.SelectedItem.ToString());
Geoprocessor gp = new Geoprocessor();
gp.OverwriteOutput = true;
gp.AddOutputsToMap = true;
string unit = "Kilometers";
ESRI.ArcGIS.AnalysisTools.Buffer buffer = new ESRI.ArcGIS.AnalysisTools.Buffer(pFl, txtOutputPath.Text, Convert.ToString(bufferDistance) + "" + unit);
try
{
IGeoProcessorResult results = (IGeoProcessorResult)gp.Execute(buffer, null);
}
catch
{
}
string fileDirectory = txtOutputPath.Text.ToString().Substring(0, txtOutputPath.Text.LastIndexOf("\\"));
int j;
j = txtOutputPath.Text.LastIndexOf("\\");
string tmpstr = txtOutputPath.Text.ToString().Substring(j + 1);
IWorkspaceFactory pWsf = new ShapefileWorkspaceFactory() as IWorkspaceFactory;
IWorkspace pWs = pWsf.OpenFromFile(fileDirectory, 0);
IFeatureWorkspace pFs = pWs as IFeatureWorkspace;
IFeatureClass pFc = pFs.OpenFeatureClass(tmpstr);
IFeatureLayer pfl = new FeatureLayer() as IFeatureLayer;
pfl.FeatureClass = pFc;
IRgbColor pColor = new RgbColor() as IRgbColor;
pColor.Red = 255;
pColor.Green = 0;
pColor.Blue = 0;
pColor.Transparency = 255;
ILineSymbol pOutline = new SimpleLineSymbol();
pOutline.Width = 2;
pOutline.Color = pColor;
pColor = new RgbColor();
pColor.Red = 255;
pColor.Green = 0;
pColor.Blue = 0;
pColor.Transparency = 100;
ISimpleFillSymbol pFillSymbol = new SimpleFillSymbol();
pFillSymbol.Color = pColor;
pFillSymbol.Outline = pOutline;
pFillSymbol.Style = esriSimpleFillStyle.esriSFSSolid;
ISimpleRenderer pRen;
IGeoFeatureLayer pGeofl = pfl as IGeoFeatureLayer;
pRen = pGeofl.Renderer as ISimpleRenderer;
pRen.Symbol = pFillSymbol as ISymbol;
pGeofl.Renderer = pRen as IFeatureRenderer;
ILayerEffects pLayerEffects = pfl as ILayerEffects;
pLayerEffects.Transparency = 150;
m_mapControl.AddLayer((ILayer)pfl, 0);
MessageBox.Show(comboBoxLayer.SelectedText + "缓冲区生成成功！");
}