protected Component getChart() {
final Chart chart = new Chart();
chart.setWidth("500px");
final Configuration configuration = new Configuration();
configuration.getChart().setType(ChartType.GAUGE);
configuration.getChart().setAlignTicks(false);
configuration.getChart().setPlotBackgroundColor(null);
configuration.getChart().setPlotBackgroundImage(null);
configuration.getChart().setPlotBorderWidth(0);
configuration.getChart().setPlotShadow(false);
configuration.setTitle("Temperature");
configuration.getPane().setStartAngle(-150);
configuration.getPane().setEndAngle(150);
YAxis yAxis = new YAxis();
yAxis.setMin(-30);
yAxis.setMax(50);
yAxis.setLineColor(new SolidColor("#339"));
yAxis.setTickColor(new SolidColor("#339"));
yAxis.setMinorTickColor(new SolidColor("#339"));
yAxis.setOffset(-25);
yAxis.setLineWidth(2);
yAxis.setLabels(new Labels());
yAxis.getLabels().setDistance(-20);
yAxis.getLabels().setRotationPerpendicular();
yAxis.setTickLength(5);
yAxis.setMinorTickLength(5);
yAxis.setEndOnTick(false);
configuration.addyAxis(yAxis);
final ListSeries series = new ListSeries("Temperature", 12);
PlotOptionsGauge plotOptionsGauge = new PlotOptionsGauge();
plotOptionsGauge.setDataLabels(new Labels());
plotOptionsGauge.getDataLabels().setFormatter("function() {return '' + this.y + ' °C';}");
GradientColor gradient = GradientColor.createLinear(0, 0, 0, 1);
gradient.addColorStop(0, new SolidColor("#DDD"));
gradient.addColorStop(1, new SolidColor("#FFF"));
plotOptionsGauge.getDataLabels().setBackgroundColor(gradient);
plotOptionsGauge.getTooltip().setValueSuffix(" °C");
series.setPlotOptions(plotOptionsGauge);
configuration.setSeries(series);
chart.drawChart(configuration);
return chart;
}
