GWT Google Charts 带切片饼图

以下是带切片饼图的示例。

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，让我们看一个带切片饼图的例子。

GWT Google Charts 带切片饼图 配置

我们使用setSlices方法来显示带有分解切片的饼图。

Slice slice1 = Slice.create();
slice1.setOffset(0.2);
Slice slice2 = Slice.create();

slice2.setOffset(0.3);
options.setSlice(1, slice1);
options.setSlice(3, slice2);

GWT Google Charts 带切片饼图 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.*;
import com.googlecode.gwt.charts.client.options.Slice;

public class HelloWorld implements EntryPoint {
    private PieChart chart;

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

        data.addRow("Firefox", 45.0);
        data.addRow("IE", 26.8);
        data.addRow("Chrome", 12.8);
        data.addRow("Safari", 8.5);
        data.addRow("Opera", 6.2);
        data.addRow("Others", 0.7);
        PieChartOptions options = PieChartOptions.create();

        options.setTitle("Browser market shares at a specific website, 2014");
        Slice slice1 = Slice.create();
        slice1.setOffset(0.2);
        Slice slice2 = Slice.create();

        slice2.setOffset(0.3);
        options.setSlice(1, slice1);
        options.setSlice(3, slice2);

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

输出结果为：