C#+AE缓冲区分析

布满荆棘的人生 2023-08-17 16:04 131阅读 0赞

趁着这次总结的机会，就想着把这几个星期编的小功能都写成博客记录下来，省的之后遗忘，我写这些东西也算是给自己加深印象吧，鱼的记忆哈哈。

# 一、AE缓冲区接口和类 #

还是老生常谈，先来了解实现缓冲区功能都需要那些接口和类：  
GP工具：也就是Geoprocessor类，这其中主要是封装了输入路径、输出路径还有就是可以调用各种工具的函数方法。它给我的感觉类似于原来我是一亩地一亩地的打农药，突然有一天来了一架飞机直接在天上散农药，一下子活就干完了。这GP工具就是那飞机，它大大的提高了效率。  
Buffer类：这里注意了这是AnalysisTools下的Buffer类，我记得有两个buffer类，下图是Buffer类中的参数设置表。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2RheXVoYWl0YW5nMQ_size_16_color_FFFFFF_t_70]图有点不清晰，我就只能截一点相对重要的信息。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2RheXVoYWl0YW5nMQ_size_16_color_FFFFFF_t_70 1]

# 二、功能的实现 #

## 2.1功能实现代码 ##

private IActiveView pActiveView;
       private AxMapControl mapControl;
    
       //通过构造函数获取MapControl控件
       public BufferAnalysis(AxMapControl mainmapControl)
           : this()
       { 
           mapControl = mainmapControl;
           pActiveView = mainmapControl.ActiveView;
       }
    
       //输出路径
       private void button1_OutputPath_Click(object sender, EventArgs e)
       { 
           SaveFileDialog saveDlg = new SaveFileDialog();
           saveDlg.Filter = "Shapefile(*.shp)|*.shp";
           if (saveDlg.ShowDialog() != DialogResult.OK) return;
    
           textBox2_OutputPath.Text = saveDlg.FileName;
       }
    
       //生成窗体函数
       private void BufferAnalysis_Load(object sender, EventArgs e)
       { 
           if (mapControl == null || pActiveView.FocusMap.LayerCount == 0)
           { 
               return;
           }
           IEnumLayer layers = pActiveView.FocusMap.get_Layers();
           layers.Reset();
           ILayer layer = layers.Next();
           while (layer != null)
           { 
               comboBox1_ChooseLayer.Items.Add(layer.Name);
               layer = layers.Next();
           }
       }
    
       //确认分析
       private void button2_OK_Click(object sender, EventArgs e)
       { 
           double bufferDistance = Convert.ToDouble(textBox1_BufferDistance.Text.Trim());
           if (bufferDistance == 0.0)
           { 
               MessageBox.Show("缓冲区距离有误！");
               return;
           }
    
           if (comboBox1_ChooseLayer.Text == string.Empty)
           { 
               MessageBox.Show("输入图层不能为空！");
               return;
           }
    
           if (textBox2_OutputPath.Text == string.Empty)
           { 
               MessageBox.Show("输出路径不能为空！");
               return;
           }
           int index = comboBox1_ChooseLayer.SelectedIndex;
           string name = getLayerPath(pActiveView.FocusMap.get_Layer(index));
           string outPath = textBox2_OutputPath.Text.Trim();
    
           Geoprocessor pGp = new Geoprocessor();
           pGp.OverwriteOutput = true; //允许运算结果覆盖现有文件，可无
           ESRI.ArcGIS.AnalysisTools.Buffer pBuffer = new ESRI.ArcGIS.AnalysisTools.Buffer();
           //获取缓冲区分析图层
           ILayer pLayer = pActiveView.FocusMap.get_Layer(index);
           IFeatureLayer featLayer = pLayer as IFeatureLayer;
           //IFeatureCursor cursor = featLayer.Search(null, false);
           //IFeature feaClass = cursor.NextFeature();
    
           pBuffer.in_features = featLayer;
    
           pBuffer.out_feature_class = outPath; //输出路径
           pBuffer.buffer_distance_or_field = bufferDistance; //缓冲区参数
           pBuffer.dissolve_option = "NONE"; //融合缓冲区重叠交叉部分，如果不融合填"ALL"
           pGp.Execute(pBuffer, null); //执行
    
           string pFolder = System.IO.Path.GetDirectoryName(outPath); //得到字符串中文件夹位置
           string pFileName = System.IO.Path.GetFileName(outPath); //得到字符串中文件名字
           mapControl.AddShapeFile(pFolder, pFileName); //往地图控件里添加文件
           mapControl.ActiveView.Refresh(); //激活窗口刷新
           this.Close();
       }
    
       //获取图层源路径
       private string getLayerPath(ILayer pLayer)
       { 
           IDatasetName pDatasetName = (pLayer as IDataLayer2).DataSourceName as IDatasetName;
           IWorkspaceName pWorkspaceName = pDatasetName.WorkspaceName;
           return pWorkspaceName.PathName +"\\" +pLayer.Name+".shp";
       }

为了省事，我直接将代码整个复制过来了哈哈。

## 2.2功能实现效果 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2RheXVoYWl0YW5nMQ_size_16_color_FFFFFF_t_70 2]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2RheXVoYWl0YW5nMQ_size_16_color_FFFFFF_t_70 3]

# 三、过程总结 #

GP工具的出现大大的提升了编程的速度，但是这也使得我们变得“肤浅”，不过现在对我这种小白来讲现在的主要矛盾其实还是学习怎么使用GP工具，其他的日后再说吧哈哈。

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