1. WIKI教程
2. 了解GWT Google Charts
3. 自定义Sankey图表(Customizing Sankey Chart)

自定义Sankey图表(Customizing Sankey Chart)

以下是自定义SanKey图表的示例。

我们已经在Google Charts Configuration Syntax一章中看到了用于绘制图表的配置 。 现在，让我们看一个自定义SanKey图表的示例。

配置 (Configurations)

我们使用Sankey类来显示Sankey图表。

Sankey chart = new Sankey();

例子 (Example)

HelloWorld.java

package com.iowiki.client;
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.user.client.ui.RootPanel;
import com.googlecode.gwt.charts.client.ChartLoader;
import com.googlecode.gwt.charts.client.ChartPackage;
import com.googlecode.gwt.charts.client.ColumnType;
import com.googlecode.gwt.charts.client.DataTable;
import com.googlecode.gwt.charts.client.options.Color;
import com.googlecode.gwt.charts.client.sankey.Sankey;
import com.googlecode.gwt.charts.client.sankey.SankeyLink;
import com.googlecode.gwt.charts.client.sankey.SankeyOptions;
public class HelloWorld implements EntryPoint {
   private Sankey chart;
   private void initialize() {
      ChartLoader chartLoader = new ChartLoader(ChartPackage.SANKEY);
      chartLoader.loadApi(new Runnable() {
         public void run() {
            // Create and attach the chart
            chart = new Sankey();
            RootPanel.get().add(chart);
            draw();
         }
      });
   }
   private void draw() {
      // Prepare the data
      DataTable data = DataTable.create();
      data.addColumn(ColumnType.STRING, "From");
      data.addColumn(ColumnType.STRING, "To");
      data.addColumn(ColumnType.NUMBER, "Weight");
      data.addRow("Brazil","Portugal",5);
      data.addRow("Brazil","France",1 );
      data.addRow("Brazil","Spain",1 );
      data.addRow("Brazil","England",1 );
      data.addRow("Canada","Portugal",1 );
      data.addRow("Canada","France",5 );
      data.addRow("Canada","England",1 );
      data.addRow("Mexico","Portugal",1 );
      data.addRow("Mexico","France",1 );
      data.addRow("Mexico","Spain",5 );
      data.addRow("Mexico","England",1 );
      data.addRow("USA","Portugal",1 );
      data.addRow("USA","France",1 );
      data.addRow("USA","Spain",1 );
      data.addRow("USA","England",5);      
      SankeyOptions options  = SankeyOptions.create();
      SankeyLink link = SankeyLink.create();
      Color color = Color.create();
      color.setStroke("black");
      color.setStrokeWidth(1);
      link.setColor(color);
      options.setLink(link);
      // Draw the chart
      chart.draw(data, options);
      chart.setWidth("400px");
      chart.setHeight("400px");
   }
   public void onModuleLoad() {
      initialize();
   }
}

结果 (Result)

验证结果。