GWT Google Charts 散点图

以下是散点图的示例。

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，让我们看一个散点图的例子。

GWT Google Charts 散点图 配置

我们使用ScatterChart类来显示散点图。

ScatterChart chart = new ScatterChart();

GWT Google Charts 散点图 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.ScatterChart;
import com.googlecode.gwt.charts.client.corechart.ScatterChartOptions;

public class HelloWorld implements EntryPoint {
    private ScatterChart chart;

    private void initialize() {
        ChartLoader chartLoader = new ChartLoader(ChartPackage.CORECHART);
        chartLoader.loadApi(new Runnable() {
            public void run() {
                // Create and attach the chart
                chart = new ScatterChart();
                RootPanel.get().add(chart);
                draw();
            }
        });
    }
    private void draw() {
        // Prepare the data
        DataTable data = DataTable.create();
        data.addColumn(ColumnType.NUMBER, "Age");
        data.addColumn(ColumnType.NUMBER, "Weight");

        data.addRow(8,12);
        data.addRow(4, 5.5);
        data.addRow(11,14);
        data.addRow(4,5);
        data.addRow(3,3.5);
        data.addRow(6.5,7);

        ScatterChartOptions options  = ScatterChartOptions.create();
        options.setTitle("Age vs Weight");
        options.setLegend(null);

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

输出结果为：