PIE属性表多字段的文本绘制

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  最近研究了PIE SDK文本元素的绘制相关内容,因为在我们的开发中,希望可以做到在打开一个Shp文件后,读取到属性表的所有字段,然后可以选择一些需要的字段,将这些字段的所有要素值的文本,绘制到shp图中相应的要素位置上。

  我主要是通过PIE的官方博文(https://www.cnblogs.com/PIESat/p/10172166.html)进行学习的,并在技术员姐姐的帮助下,最后成功的将文本绘制于图上。

结果如下图所示:

  先打开一张属性表字段不为空Shp文件

  读取shp的属性表中的所有字段,选取需要绘制在图上的字段

  将所选的字段的值绘制到相应的要素的位置上

  开发环境:vs2013 framework4

代码如下:

  在子窗口的构造函数中,遍历当前shp文件属性表的所有字段,并设置默认好默认字体样式

 1  #region 构造函数
 2         public FeaturesShow(IFeatureDataset featureDataset)
 3         {
 4             InitializeComponent();
 5             m_featureDataset = featureDataset;
 6             IFeature feature = m_featureDataset.GetNextFeature();
 7             for (int i = 1; i < feature.GetFieldCount(); i++)
 8             {
 9                 string fieldname = feature.GetFieldName(i);
10                 this.listBox1.Items.Add(fieldname);
11             }
12             //默认字体
13             FontDlg.Font = new Font("Calibri", 15, FontStyle.Bold);
14             FontDlg.Color = Color.Chartreuse;
15         }
16    #endregion

  点击了子窗体的确定后,返回得到已选择的字段名,和设置的字体样式,并在图上进行绘制

 1         private void 文本绘制ToolStripMenuItem_Click(object sender, EventArgs e)
 2         {
 3             if (mapControl1.ActiveView.CurrentLayer == null)
 4                 return;
 5             IFeatureLayer featurelayer = mapControl1.ActiveView.CurrentLayer as IFeatureLayer;
 6             if (featurelayer == null)
 7                 return;
 8 
 9             //清除图上已绘制的元素
10             mapControl1.ActiveView.GraphicsContainer.DeleteAllElements();
11             //获得要读取的数据,传入子窗体
12             IFeatureDataset featureDataset = featurelayer.FeatureClass.GetFeatureDataset();
13             FeaturesShow frm = new FeaturesShow(featureDataset);
14             frm.ShowDialog();       //通过窗口来选择需要展示在图上的特征值
15             if (frm.DialogResult == DialogResult.OK)
16             {
17                 //符号设置
18                 FontDialog m_FontDlg = frm.m_FontDlg;
19                 ITextSymbol textSymbol = new TextSymbol();                
20                 textSymbol.Color = m_FontDlg.Color;
21                 textSymbol.Font = m_FontDlg.Font;
22                 textSymbol.Size = m_FontDlg.Font.Size;              
23                
24                 int m_FeatureCount = frm.m_FeatureCount;
25                 string[] m_Fieldname=frm.m_Fieldname;
26                 int[] index = new int[m_FeatureCount+1];               
27                 IFields fields = featureDataset.GetFields();
28                 index[0] = 0;
29                 for (int i = 1; i < m_FeatureCount+1;i++ )
30                 {
31                     index[i] = fields.GetFieldIndex(m_Fieldname[i-1]);
32                 }                                        
33                 IFeature feature = featureDataset.GetFeature(0);
34                 while (feature != null)
35                 {
36                     ////取左上角坐标值
37                     IPolygon polygon = new PIE.Geometry.Polygon();
38                     polygon = feature.Geometry as IPolygon;
39                     IPointCollection poly = polygon as IPointCollection;
40                     IPoint point = poly.GetPoint(0);
41                     //创建文本元素实例对象
42                     ITextElement textElement = new PIE.Carto.TextElement();
43                     textElement.Geometry = point as IGeometry;
44                     textElement.Symbol = textSymbol;
45                     
46                     for(int i=1;i<m_FeatureCount+1;i++)
47                     {
48                         string strValue = "";
49                         if (feature.IsValueNull(index[i]) == false)
50                         {
51                             strValue = m_Fieldname[i-1] + ":" + feature.GetValue(index[i]).ToString() + "\r\n";                                
52                             textElement.Text = textElement.Text+strValue;                                                                
53                         }                                
54                     }
55                     if(textElement.Text!="")
56                     {
57                         string strID = fields.GetFieldName(0) + ":" + feature.GetValue(index[0]).ToString() + "\r\n";
58                         textElement.Text = strID + textElement.Text;
59                         mapControl1.ActiveView.GraphicsContainer.AddElement(textElement);
60                     }
61                     feature = featureDataset.GetNextFeature();                                      
62                 }
63                 mapControl1.PartialRefresh(ViewDrawPhaseType.ViewAll);
64             }
65         }

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