yunwei37 / COVID-19-ArcEngine

使用ArcEngine + Devpress 开发的湖北疫情数据分析专题可视化系统,包含疫情地图展示、操作、输出,疫情统计、数据分析等功能

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Group_03:湖北疫情数据专题显示系统

新型冠状病毒肺炎(COVID-19,简称“新冠肺炎”)疫情肆虐全球多个国家,2020年3月11日,世界卫生组织 (WHO) 正式宣布将新冠肺炎列为全球性大流行病。在全球抗击新型冠状病毒疫情的过程中,产生了前所未有的大规模疫情数据,利用大数据分析技术和方法能够协助发现病毒传染源、监测疫情发展、调配救援物资,从而更好地进行疫情防控工作。空间数据分析作为大数据分析的重要组成,将数据智能处理、直观展示和交互分析有机地结合,使机器智能和人类智慧深度融合、优势互补,为疫情防控中的分析、指挥和决策提供有效依据和指南。

简介:

本系统基于ArcEngine进行开发,支持武汉疫情地图根据不同日期的展示、操作以及添加图例、导出为多种格式,支持属性数据的编辑和查询,支持指定时间区段统计疫情与轨迹分析功能;可以直观地展示出疫情的发展态势,为疫情分析和防控工作作出更好的决策参考。

程序功能设计与展示:

开始界面布局:

进入程序显示的开始界面:

  • 窗口上方为菜单栏,包含文件、查询、属性编辑、地图导出等标签;
  • 菜单栏的文件选项包含打开MXD文件、shapefile文件,可以根据选择的日期来渲染每日疫情地图,也可以通过疫情统计按钮打开疫情统计窗口;
  • 下方页面包含空间展示和属性数据两个标签,分别展示地图和属性数据;
  • 地图包含左侧的TOC和右侧的地图显示窗口;
  • 显示窗口可以切换数据视图和页面视图;

每日疫情地图:

可以根据选择的日期来渲染每日疫情地图,通过分层渲染的方式来表现疫情人数的多少;支持各种常规的地图操作,如放大缩小平移等等;

行进轨迹绘制:

可以根据行进轨迹数据文件,选取时间段绘制轨迹并分析经过的地市和疫情状况:

空间查询:

本系统支持多种查询方式,包含点击查询、矩形、多边形、圆等多种空间查询,并可以查看相应选择集:

地图导出

本系统支持导出为多种格式,如jpg/tif/pdf等;可以在页面视图中实时查看所要导出的图形;并支持添加图例等。

属性数据:

本系统支持查看数据集和进行属性数据的编辑;

疫情统计:

支持根据时间段显示疫情的统计数据,包含总量和变化量;

附加功能:

  • 支持操作日志记录功能,便于对程序的错误进行排查;

程序具体实现

数据存储与操作方式:

  • 将湖北市域图形数据存储在shp文件中,通过加载shp按钮进行载入;

  • 选择网易的疫情实时动态播报平台作为数据源,其地址如下:

    https://wp.m.163.com/163/page/news/virus_report/index.html?nw=1&anw=1

    通过爬虫请求获取数据(从1.1日至5.31日),经过数据清洗后保存为csv文件;

  • 在具有公网ip地址的 windows server 上搭建mysql数据库,将确诊人数数据存入数据库中,连接数据库获取确诊数据信息;可以便于后续在服务器上继续更新数据;

  • 创建了DAO层,将数据库的增删改查等操作封装在工具类中,和具体程序业务逻辑分隔开来,其中包含了三个类:

    • SqlHelper:创建数据库连接、执行数据库命令、 创建MySqlDataReader对象:

      其中定义的接口:

      public MySqlConnection getMySqlCon();
      public int getMySqlCom(string M_str_sqlstr, params MySqlParameter[] parameters);
      public DataTable getMySqlRead(string M_str_sqlstr, params MySqlParameter[] parameters);
    • sqlDataFormat:进行数据格式的修改:

      其中定义的接口:

      public static string dataFormat(string str);
    • OperateDatabase:定义了数据库增加、删除、修改、查找的接口;

      其中定义的接口:

      public static int Insert(string TableName,ArrayList arr);
      public static DataTable select(string TableName, ArrayList arr);
      public static int Update(string TableName, ArrayList arr,ArrayList arr_where);
      public static int Delete(string TableName, ArrayList arr_where);

程序模块设计与文件组织:

程序可以分为以下几个模块:

  1. 辅助类:

    包含和数据库操作相关的DAO层、图例附加属性定义和日志模块;除了上述描述的数据操作类以外,还有:

    • EnumMapSurroundType:图例附加属性定义类
    • Log: 日志模块类
  2. 地图操作相关:

    主要包含地图操作(平移、缩放),地图渲染,以及地图导出等功能;

    • Form1:地图展示和操作相关的实现;
    • GisClass:包含了打开MXD文件、shp文件,以及地图渲染的一些辅助函数;
  3. 属性操作相关

    包含在地图上进行空间查询属性、在属性表中进行属性编辑等;

    • Form1:属性表编辑和展示等操作
    • SeletionForm:进行属性查询
    • AddForm:添加数据
  4. 疫情数据统计模块:

    包含对疫情的统计图表生成操作;

    • StaticsForm类

从界面美观的角度考虑,我们采用了DevExpress进行开发;DevExpress是一个比较有名的界面控件套件,提供了一系列的界面控件套件的DotNet界面控件。

窗口:

  • 主窗体类为Form1.cs
  • 进行属性查询选择窗体类为SeletionForm.cs
  • 统计图表类为StaticsForm.cs
  • 添加数据类为AddForm.cs

主要功能实现流程与方法

  1. 地图展示和常规地图操作:

    • 采用ArcEngine的mapControl控件进行地图展示:
    • 采用ArcEngine的ToolbarControl控件完成常规的地图操作,如放大、缩小、平移、全图;
    • 加载shp/mxd文件:

    打开mxd文件:

      private void openMxd_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
         {
             String MxdPath=GisClass.OpenMxd();
             axMapControl1.LoadMxFile(MxdPath);
         }
    
     public static string OpenMxd()
         {
             string MxdPath = "";
             OpenFileDialog OpenMXD = new OpenFileDialog();
             OpenMXD.Title = "打开地图";
             OpenMXD.InitialDirectory = "E:";
    
             OpenMXD.Filter = "Map Documents (*.mxd)|*.mxd";
             if (OpenMXD.ShowDialog() == DialogResult.OK)
             {
                 MxdPath = OpenMXD.FileName;
             }
             return MxdPath;
         }

    打开shp文件:

    public static string[] OpenShapeFile()
        {
            string[] ShpFile = new string[2];
            OpenFileDialog OpenShpFile = new OpenFileDialog();
            OpenShpFile.Title = "打开Shape文件";
            OpenShpFile.InitialDirectory = "E:";
            OpenShpFile.Filter = "Shape文件(*.shp)|*.shp";
    
            if (OpenShpFile.ShowDialog() == DialogResult.OK)
            {
                string ShapPath = OpenShpFile.FileName;
                //利用"\\"将文件路径分成两部分
                int Position = ShapPath.LastIndexOf("\\");
    
                string FilePath = ShapPath.Substring(0, Position);
                string ShpName = ShapPath.Substring(Position + 1);
                ShpFile[0] = FilePath;
    
                ShpFile[1] = ShpName;
    
            }
            else
            {
                return null;
            }
            return ShpFile;
        }
  2. 每日疫情分布显示:

    • 通过打开shp文件按钮加载市域.shp,再遍历图层获取湖北市域空间数据;如未加载,系统会报错如下:
        //遍历,寻找市域图层
            for (int i = 0; i < this.axMapControl1.Map.LayerCount; i++) {
                ILayer layer1 = this.axMapControl1.Map.get_Layer(i);
                if (layer1.Name == "市域")
                {
                    layer = layer1 as IFeatureLayer;
                    break;
                }
            }
            if (layer == null) {
                MessageBox.Show("请打开市域图层");
                return;
            } 
    • 点击每日疫情按钮,首先获取图层的相应字段,然后根据选择的日期在数据库中进行查询,获取疫情数据;
    //获取图层字段,没有则添加一个num字段
            IFeatureClass featureClass = layer.FeatureClass;
            int isExist=featureClass.FindField("num");
            if (isExist == -1) { 
                //添加一个字段
                IFields pFields = featureClass.Fields;
                IFieldsEdit pFieldsEdit = pFields as IFieldsEdit;
                IField fld = new FieldClass();
                IFieldEdit2 fldE = fld as IFieldEdit2;
                fldE.Name_2 = "num";
                fldE.AliasName_2 = "数量";
                fldE.Type_2 = esriFieldType.esriFieldTypeSingle;
                featureClass.AddField(fld);
            }
            //给字段赋值
            IFeatureCursor pFtCursor = featureClass.Search(null, false);
            IFeature pFt = pFtCursor.NextFeature();
            int index1 = pFt.Fields.FindField("num");
            IDataset dataset = (IDataset)featureClass;
            IWorkspace workspace = dataset.Workspace;
            IWorkspaceEdit workspaceEdit = (IWorkspaceEdit)workspace;
            workspaceEdit.StartEditing(true);
            workspaceEdit.StartEditOperation();
            while (pFt != null) {
                int index = pFt.Fields.FindField("code");
                String code = pFt.get_Value(index).ToString();
    
                DataRow[] drs=dt.Select("CODE=" + code);
                DataTable dtNew = dt.Clone();
                for (int i = 0; i < drs.Length; i++)
                {
                    dtNew.ImportRow(drs[i]);
    
                }
                String num = dtNew.Rows[0]["AllConfiemed"].ToString();
                if (num == "") {
                    num = "0";
                }
    
                pFt.set_Value(index1,  Convert.ToInt32(num));
                pFt.Store();
                pFt = pFtCursor.NextFeature();
            }
    • 根据获取的数据对图层进行渲染
    GisClass.ClassRender(this.axMapControl1.ActiveView, layer, 6, "num");
  3. 空间查询操作:

    • 通过点击图形按钮,绘制多边形、圆、矩形等;

    如绘制多边形:先设置绘制类型为多边形,再创建一个多边形元素,设置相应属性,在pGraphicsContainer中添加该多边形;然后鼠标点击时追踪多边形,并局部刷新map

        private void drawPolygon_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
        {
            this.type = 1;
            IPolygonElement polygonElement = new PolygonElementClass();
            pElement = polygonElement as IElement;
            ISimpleFillSymbol simpleFill = new SimpleFillSymbolClass();
            simpleFill.Style = esriSimpleFillStyle.esriSFSNull;
            simpleFill.Color = GisClass.GetRgbColor(255,0,0);
            //设置边线颜色
            ILineSymbol lineSymbol = new SimpleLineSymbol();
            lineSymbol.Color = GisClass.GetRgbColor(255, 0, 0);
            IFillShapeElement shapeEle = pElement as IFillShapeElement;
    
            simpleFill.Outline = lineSymbol;
            shapeEle.Symbol = simpleFill;
            pGraphicsContainer.AddElement(pElement, 0);
        
          
        }
        private void axMapControl1_OnMouseDown(object sender, IMapControlEvents2_OnMouseDownEvent e{
        .......
                if (this.type == 1)
                {
    
                    IGeometry Polygon = axMapControl1.TrackPolygon();
                    pElement.Geometry = Polygon;
                    axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewBackground, null, null);
                }
        ......
        }
    • 通过点击查询,对所选范围执行空间查询操作,对地图上查询到的部分进行高亮显示;
    private void query_btn_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
        {
            ArrayList arr = new ArrayList();
            DataTable dt = OperateDatabase.select("data", arr);
            this.gridControl1.DataSource = dt;
            this.tabControl2.SelectedIndex = 1;
        }
    
    
    • 点击进行属性查询,打开属性表;
        private void shapeQuery_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
        {
            axMapControl1.Map.ClearSelection();
            IGraphicsContainer graphicsContainer = axMapControl1.Map as IGraphicsContainer;
            graphicsContainer.Reset();
            IElement element = graphicsContainer.Next();
            //获取图形几何信息
            if (element == null) {
                MessageBox.Show("请在工具栏选择绘制矩形,多边形,或者圆");
                return;
            }
            IGeometry geometry = element.Geometry;
            axMapControl1.Map.SelectByShape(geometry,null,false);
            //进行部分刷新显示最新要素
            axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeoSelection,null,axMapControl1.ActiveView.Extent);
        }
    
  4. 属性数据编辑:

    • 在属性数据的页面中,可以点击查询、增加、删除等按钮进行属性数据的编辑;

    修改单元格内容:

            //获取修改的单元格
            string CellValue = this.gridView1.GetFocusedValue().ToString();
            //获取单元格的列名
            string ColumnName = this.gridView1.FocusedColumn.FieldName;
            //获取所在列的id
            DataRow dr = this.gridView1.GetDataRow(e.RowHandle);
            string id = dr["id"].ToString();
            //修改
            ArrayList arr = new ArrayList();
            if (ColumnName == "name" || ColumnName == "YMD")
            {
                arr.Add(ColumnName + ":'" + CellValue + "'");
            }
            else
            {
                arr.Add(ColumnName + ":" + CellValue);               
            }
            ArrayList arr_where = new ArrayList();
            arr_where.Add("id:" + id);
            int result = OperateDatabase.Update("data", arr, arr_where);
            if (result == 0)
            {
                MessageBox.Show("该值修改失败");
            }

    添加数据:

    private void add_btn_Click(object sender, EventArgs e)
        {
            ArrayList arr = new ArrayList();
            arr.Add("code:"+this.textBox_code.Text);
            arr.Add("name:'" + this.textBox_name.Text+"'");
            arr.Add("YMD:'" + this.date_edit.Text+"'");
            arr.Add("AllConfiemed:" + this.spinEdit_AllConfiemed.Text);
            arr.Add("CurConfirmeed:" + this.spinEdit_CurConfirmeed.Text);
            arr.Add("Cured:" + this.spinEdit_Cured.Text);
            arr.Add("Death:" + this.spinEdit_Death.Text);
            int result = OperateDatabase.Insert("data",arr);
            if (result == 1)
            {
                MessageBox.Show("添加成功");
                return;
            }else {
                MessageBox.Show("添加失败");
                return;
            }
        }

    属性查询结果:

    在属性查询结果中是以树的方式展示不同图层的查询结果:

        private void treeView1_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)
        {
            this.gridView1.Columns.Clear();
            currentLayer = e.Node.Tag as IFeatureLayer;
            if (currentLayer == null) {
                return;
            }
            IFeatureSelection featureSelection = currentLayer as IFeatureSelection;
            //获取选中得要素几何
            ISelectionSet selectionSet = featureSelection.SelectionSet;
            //获取字段
            IFields fields = currentLayer.FeatureClass.Fields;
            DataTable dt = new DataTable();
            for (int i = 0; i < fields.FieldCount; i++) {
                dt.Columns.Add(fields.get_Field(i).Name);
            }
            //获取整个数据集
            ICursor cursor;
            selectionSet.Search(null,false,out cursor);
            //获取每个要素
            IFeatureCursor featureCursor = cursor as IFeatureCursor;
            //遍历
            IFeature feature = featureCursor.NextFeature();
            String[] strs;
            while (feature != null) {
                strs = new String[fields.FieldCount];
                for (int i = 0; i < fields.FieldCount; i++) {
                    strs[i] = feature.get_Value(i).ToString();
                }
                dt.Rows.Add(strs);
                feature = featureCursor.NextFeature();
            }
            this.gridControl1.DataSource = dt;
           
        }
  5. 疫情统计:

    • 在主页面上点击疫情统计,可显示查询窗口,其中可完成对于疫情统计图表的生成和查看;
    private void statics_btn_Click(object sender, EventArgs e)
        {
            //查询起始日期的数字
            if (this.dateEdit_start.Text == "" || this.dateEdit_target.Text == "") {
                MessageBox.Show("请填写起止日期");
                return;
            }
            ArrayList arr1 = new ArrayList();
            arr1.Add("YMD:'" + this.dateEdit_start.Text + "'");
            DataTable dt1 = OperateDatabase.select("data",arr1);
            ArrayList arr2 = new ArrayList();
            arr1.Add("YMD:'" + this.dateEdit_target.Text + "'");
            DataTable dt2 = OperateDatabase.select("data", arr1);
            Series s1 = this.chartControl1.Series[0];
            s1.DataSource = dt1;
            s1.ArgumentDataMember = "name";
            s1.ValueDataMembers[0] = "CurConfirmeed";
        }
  6. 轨迹分析:

    • 通过日期框进行日期区间的选择;
    • 轨迹数据已存放在数据库中,通过sql查询载入轨迹数据:
    • 进行轨迹查询:
    • 绘制轨迹:
        if (this.start_time.EditValue == "" || this.end_time.EditValue == "") {
                MessageBox.Show("请选择起止日期");
                return;
            }
            SqlHelper help = new SqlHelper();
            String sql = "select * from route where tm between '" + this.start_time.EditValue + "' and '" + this.end_time.EditValue+"'";
            DataTable dt = help.getMySqlRead(sql);
            ISimpleMarkerSymbol simpleMarkerSymbol = new SimpleMarkerSymbol();
            simpleMarkerSymbol.Style = esriSimpleMarkerStyle.esriSMSCircle;
            IColor color = GisClass.GetRgbColor(0,255,0);
            simpleMarkerSymbol.Color = color;
            ILineElement lineElement = new LineElementClass();
            IElement ele1 = lineElement as IElement;
            ISegment pSegment;
            ILine pLine=null;
            object o = Type.Missing;
            ISegmentCollection pPath = new PathClass();
            for (int i = 0; i < dt.Rows.Count; i++) {
    
                IMarkerElement markerEle = new MarkerElementClass();
                IElement ele=markerEle as IElement;
                IPoint point = new PointClass();
                markerEle.Symbol = simpleMarkerSymbol;
                point.PutCoords(Double.Parse(dt.Rows[i]["x"].ToString()),Double.Parse(dt.Rows[i]["y"].ToString()));
                ele.Geometry = point;
                pGraphicsContainer.AddElement(ele,0);
                //逐段添加线
                if (i > 0 && i < dt.Rows.Count) {
                    IPoint point1 = new PointClass();
                    point1.PutCoords(Double.Parse(dt.Rows[i-1]["x"].ToString()), Double.Parse(dt.Rows[i-1]["y"].ToString()));
                    pLine = new LineClass();
                    pLine.PutCoords(point1, point);
                    pSegment = pLine as ISegment;
                    pPath.AddSegment(pSegment, ref o, ref o);
                }
              
               
                axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewBackground, null, null);
            }
            IGeometryCollection pPolyline = new PolylineClass();
            pPolyline.AddGeometry(pPath as IGeometry, ref o, ref o);
            IPolyline polyline = pPolyline as IPolyline;
            //获取范围
            IEnvelope ev = polyline.Envelope;
            this.axMapControl1.ActiveView.Extent = ev;
            ele1.Geometry = pPolyline as IPolyline;
            pGraphicsContainer.AddElement(ele1, 0);
  7. 每日疫情图输出:

    • 添加图例:可为地图添加指北针、比例尺等;

    添加指北针:

    void addNorthArrow(IPageLayout pPageLayout, IEnvelope pEnv, IActiveView pActiveView)
        {
            if (pPageLayout == null || pActiveView == null)
            {
                return;
            }
         
    
            ESRI.ArcGIS.esriSystem.IUID uid = new ESRI.ArcGIS.esriSystem.UIDClass();
            uid.Value = "esriCarto.MarkerNorthArrow";
    
            ESRI.ArcGIS.Carto.IGraphicsContainer graphicsContainer = pPageLayout as ESRI.ArcGIS.Carto.IGraphicsContainer; 
            ESRI.ArcGIS.Carto.IActiveView activeView = pPageLayout as ESRI.ArcGIS.Carto.IActiveView; 
            ESRI.ArcGIS.Carto.IFrameElement frameElement = graphicsContainer.FindFrame(pActiveView.FocusMap);
            ESRI.ArcGIS.Carto.IMapFrame mapFrame = frameElement as ESRI.ArcGIS.Carto.IMapFrame; // Dynamic Cast
            ESRI.ArcGIS.Carto.IMapSurroundFrame mapSurroundFrame = mapFrame.CreateSurroundFrame(uid as ESRI.ArcGIS.esriSystem.UID, null); // Dynamic Cast
            ESRI.ArcGIS.Carto.IElement element = mapSurroundFrame as ESRI.ArcGIS.Carto.IElement; // Dynamic Cast
            element.Geometry = pEnv;
            element.Activate(activeView.ScreenDisplay);
            graphicsContainer.AddElement(element, 0);
            ESRI.ArcGIS.Carto.IMapSurround mapSurround = mapSurroundFrame.MapSurround;
    
            // Change out the default north arrow
            ESRI.ArcGIS.Carto.IMarkerNorthArrow markerNorthArrow = mapSurround as ESRI.ArcGIS.Carto.IMarkerNorthArrow; // Dynamic Cast
            ESRI.ArcGIS.Display.IMarkerSymbol markerSymbol = markerNorthArrow.MarkerSymbol;
            ESRI.ArcGIS.Display.ICharacterMarkerSymbol characterMarkerSymbol = markerSymbol as ESRI.ArcGIS.Display.ICharacterMarkerSymbol; // Dynamic Cast
            characterMarkerSymbol.CharacterIndex = 200; // change the symbol for the North Arrow
            markerNorthArrow.MarkerSymbol = characterMarkerSymbol;
        }

    添加比例尺:

    public void makeScaleBar(IActiveView pActiveView, IPageLayout pPageLayout, IEnvelope pEnv)
        {
            IGraphicsContainer container = pPageLayout as IGraphicsContainer;
            // 获得MapFrame  
            IFrameElement frameElement = container.FindFrame(pActiveView.FocusMap);
            IMapFrame mapFrame = frameElement as IMapFrame;
            //根据MapSurround的uid,创建相应的MapSurroundFrame和MapSurround  
            UID uid = new UIDClass();
            uid.Value = "esriCarto.AlternatingScaleBar";
            IMapSurroundFrame mapSurroundFrame = mapFrame.CreateSurroundFrame(uid, null);
            //设置MapSurroundFrame中比例尺的样式  
            IMapSurround mapSurround = mapSurroundFrame.MapSurround;
            IScaleBar markerScaleBar = ((IScaleBar)mapSurround);
            markerScaleBar.LabelPosition = esriVertPosEnum.esriBelow;
            markerScaleBar.UseMapSettings();
            //QI,确定mapSurroundFrame的位置  
            IElement element = mapSurroundFrame as IElement;
    
            element.Geometry = pEnv;
            //使用IGraphicsContainer接口添加显示  
            container.AddElement(element, 0);
            pActiveView.Refresh();  
        }
        #endregion     
    • 点击输出按钮,可将疫情图输出为多种格式:

    如导出为图片:

    private void ExportMapToImage()
        {
            try
            {
                SaveFileDialog pSaveDialog = new SaveFileDialog();
                pSaveDialog.FileName = "";
                pSaveDialog.Filter = "JPG图片(*.JPG)|*.jpg|tif图片(*.tif)|*.tif|PDF文档(*.PDF)|*.pdf";
                if (pSaveDialog.ShowDialog() == DialogResult.OK)
                {
                    double iScreenDispalyResolution =this.axPageLayoutControl1.ActiveView.ScreenDisplay.DisplayTransformation.Resolution;// 获取屏幕分辨率的值
                    IExporter pExporter = null;
                    if (pSaveDialog.FilterIndex == 1)
                    {
                        pExporter = new JpegExporterClass();
                    }
                    else if (pSaveDialog.FilterIndex == 2)
                    {
                        pExporter = new TiffExporterClass();
                    }
                    else if (pSaveDialog.FilterIndex == 3)
                    {
                        pExporter = new PDFExporterClass();
                    }
                    pExporter.ExportFileName = pSaveDialog.FileName;
                    pExporter.Resolution = (short)iScreenDispalyResolution; //分辨率
                    tagRECT deviceRect = this.axPageLayoutControl1.ActiveView.ScreenDisplay.DisplayTransformation.get_DeviceFrame();
                    IEnvelope pDeviceEnvelope = new EnvelopeClass();
                    pDeviceEnvelope.PutCoords(deviceRect.left, deviceRect.bottom, deviceRect.right, deviceRect.top);
                    pExporter.PixelBounds = pDeviceEnvelope; // 输出图片的范围
                    ITrackCancel pCancle = new CancelTrackerClass();//可用ESC键取消操作
                    this.axPageLayoutControl1.ActiveView.Output(pExporter.StartExporting(), pExporter.Resolution, ref deviceRect, this.axPageLayoutControl1.ActiveView.Extent, pCancle);
                    Application.DoEvents();
                    pExporter.FinishExporting();
                }
    
            }
            catch (Exception Err)
            {
                MessageBox.Show(Err.Message, "输出图片", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
        }

    除了导出为图片之外,支持多种其他格式,如pdf、jpg等

组员构成及分工:

  • 何昂展: 属性数据相关编辑与空间查询操作、每日疫情分布显示与疫情统计;
  • 许石炜: 数据结构和数据库设计与实施,地图操作实现,轨迹分析与查询,地图输出;
  • 郑昱笙: 地图展示,属性数据、疫情分布显示等功能的完善和bug修复,以及文档撰写;

遗留的一些问题与思考

  • 进行查询需要操作的步骤较多,后续可以继续优化;
  • 可以适当丰富疫情统计功能;
  • 从此次课程项目中也确实学到了许多,了解了一个GIS应用程序的完整开发流程;

About

使用ArcEngine + Devpress 开发的湖北疫情数据分析专题可视化系统,包含疫情地图展示、操作、输出,疫情统计、数据分析等功能


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