Combination chart helps in rendering each series as a different marker type from the following list: line, area, bars, candlesticks, and stepped area. To assign a default marker type for series, use the seriesType property. Series property is to be used to specify properties of each series individually. Following is an example of a Column Chart showing differences.

We have already seen the configurations used to draw a chart in Google Charts Configuration Syntax chapter. Now, let us see an example of a Column Chart showing differences.

Configurations

We”ve used ComboChart class to show a Combination Chart.

// Combination chart
ComboChart chart = new ComboChart();

Example

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.corechart.ComboChart;
import com.googlecode.gwt.charts.client.corechart.ComboChartOptions;
import com.googlecode.gwt.charts.client.corechart.ComboChartSeries;
import com.googlecode.gwt.charts.client.options.HAxis;
import com.googlecode.gwt.charts.client.options.SeriesType;
import com.googlecode.gwt.charts.client.options.VAxis;

public class HelloWorld implements EntryPoint {
   private ComboChart chart;

   private void initialize() {
      ChartLoader chartLoader = new ChartLoader(ChartPackage.CORECHART);
      chartLoader.loadApi(new Runnable() {
         public void run() {
            // Create and attach the chart
            chart = new ComboChart();
            RootPanel.get().add(chart);
            draw();
         }
      });
   }
   private void draw() {
      // Prepare the data
      DataTable data = DataTable.create();
      data.addColumn(ColumnType.STRING, "Fruits");
      data.addColumn(ColumnType.NUMBER, "Jane");
      data.addColumn(ColumnType.NUMBER, "Jone");
      data.addColumn(ColumnType.NUMBER, "Average");
      
      data.addRow("Apples", 3, 2, 2.5);
      data.addRow("Oranges",2, 3, 2.5);
      data.addRow("Pears", 1, 5, 3);
      data.addRow("Bananas", 3, 9, 6);    		
      data.addRow("Plums", 4, 2, 3);    
      
      // Set options
      ComboChartOptions options = ComboChartOptions.create();
      options.setTitle("Fruits distribution");
      options.setHAxis(HAxis.create("Person"));
      options.setVAxis(VAxis.create("Fruits"));
      options.setSeriesType(SeriesType.BARS);

      ComboChartSeries lineSeries = ComboChartSeries.create();
      lineSeries.setType(SeriesType.LINE);
      options.setSeries(2,lineSeries);

      // Draw the chart
      chart.draw(data,options);
      chart.setWidth("400px");
      chart.setHeight("400px");
   }
   public void onModuleLoad() {
      initialize();
   }
}

Result

Verify the result.