GWT Google Charts 基本阶梯图

以下是基本阶梯图的示例。

我们已经在《GWT Google Charts 入门程序》章节中看到了用于绘制图表的基本步骤。现在，让我们看一个基本阶梯图的例子。

GWT Google Charts 基本阶梯图 配置

我们使用ScatterChart类来显示基本阶梯图。

SteppedChart chart = new SteppedChart();

GWT Google Charts 基本阶梯图 示例

package com.yiidian.helloWorld.client;

import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.user.client.ui.*;
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.SteppedAreaChart;
import com.googlecode.gwt.charts.client.corechart.SteppedAreaChartOptions;
import com.googlecode.gwt.charts.client.options.VAxis;
import com.googlecode.gwt.charts.client.treemap.TreeMap;
import com.googlecode.gwt.charts.client.treemap.TreeMapOptions;

public class HelloWorld implements EntryPoint {
    private SteppedAreaChart chart;

    private void initialize() {
        ChartLoader chartLoader = new ChartLoader(ChartPackage.CORECHART);
        chartLoader.loadApi(new Runnable() {
            public void run() {
                // Create and attach the chart
                chart = new SteppedAreaChart();
                RootPanel.get().add(chart);
                draw();
            }
        });
    }
    private void draw() {
        // Prepare the data
        DataTable data = DataTable.create();
        data.addColumn(ColumnType.STRING, "Director (Year)");
        data.addColumn(ColumnType.NUMBER, "Rotten Tomatoes");
        data.addColumn(ColumnType.NUMBER, "IMDB");

        data.addRow("Alfred Hitchcock (1935)", 8.4, 7.9);
        data.addRow("Ralph Thomas (1959)",     6.9,         6.5);
        data.addRow("Don Sharp (1978)",        6.5,         6.4);
        data.addRow("James Hawes (2008)",      4.4,         6.2);

        SteppedAreaChartOptions options  = SteppedAreaChartOptions.create();
        options.setTitle("The decline of 'The 39 Steps'");
        VAxis vAxis = VAxis.create();
        vAxis.setTitle("Accumulated Rating");

        // Draw the chart
        chart.draw(data, options);
        chart.setWidth("600px");
        chart.setHeight("400px");
    }
    public void onModuleLoad() {
        initialize();
    }
}

输出结果为：