GWT Highcharts 负值区域图

GWT Highcharts 负值区域图 介绍

我们已经在《GWT Highcharts 入门案例》一章中看到了用于绘制此图表的步骤。现在让我们考虑以下示例以进一步了解负值区域图。

GWT Highcharts 负值区域图 示例

package com.yiidian.helloWorld.client;


import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.i18n.client.DateTimeFormat;
import com.google.gwt.i18n.client.NumberFormat;
import com.google.gwt.user.client.ui.RootPanel;
import org.moxieapps.gwt.highcharts.client.*;
import org.moxieapps.gwt.highcharts.client.labels.*;

public class HelloWorld implements EntryPoint {
    public void onModuleLoad() {
        Chart chart = new Chart()
                .setType(Series.Type.AREA)
                .setChartTitleText("Historic and Estimated Worldwide Population Growth by Region")
                .setChartSubtitleText("Source: Wikipedia.org")
                .setToolTip(new ToolTip()
                        .setFormatter(new ToolTipFormatter() {
                            @Override
                            public String format(ToolTipData toolTipData) {
                                return toolTipData.getXAsString() + ": " +
                                        NumberFormat.getFormat("#,###").format(toolTipData.getYAsDouble()) + " millions";
                            }
                        }));

        XAxis xAxis = chart.getXAxis();
        xAxis.setCategories("1750", "1800", "1850", "1900", "1950", "1999", "2050");
        xAxis.setTickmarkPlacement(XAxis.TickmarkPlacement.ON);
        xAxis.setAxisTitleText(null);

        YAxis yAxis = chart.getYAxis();
        yAxis.setAxisTitleText("Billions");
        yAxis.setLabels(new YAxisLabels()
                .setFormatter(new AxisLabelsFormatter() {
                    @Override
                    public String format(AxisLabelsData axisLabelsData) {
                        return String.valueOf(axisLabelsData.getValueAsLong() / 1000);
                    }
                }));

        chart.addSeries(chart.createSeries()
                .setName("Asia")
                .setPoints(new Number[] { 502, 635, 809, 947, 1402, 3634, 5268 })
        );
        chart.addSeries(chart.createSeries()
                .setName("Africa")
                .setPoints(new Number[] { 106, 107, 111, 133, 221, 767, 1766 })
        );
        chart.addSeries(chart.createSeries()
                .setName("Europe")
                .setPoints(new Number[] { 163, 203, 276, -408, 547, 729, 628 })
        );
        chart.addSeries(chart.createSeries()
                .setName("America")
                .setPoints(new Number[] { 18, 31, 54, 156, -339, 818, 1201 })
        );
        chart.addSeries(chart.createSeries()
                .setName("Oceania")
                .setPoints(new Number[] { -2, 2, 2, 16, -13, -30, 46 })
        );
        RootPanel.get().add(chart);
    }
}

输出结果为：