自定義桑基圖

以下是一個自定義桑基圖的示例。

我們已在 Google Charts 配置語法 章節中瞭解了用於繪製圖表中的配置。現在，讓我們看一個自定義桑基圖的示例。

配置

我們已使用 Sankey 類別來顯示桑基圖。

Sankey chart = new Sankey();

示例

HelloWorld.java

package com.tutorialspoint.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();
   }
}

結果

驗證結果。