private Chart createChart(int points) {
Chart chart = new Chart(ChartType.SCATTER);
Configuration conf = chart.getConfiguration();
conf.getChart().setZoomType(ZoomType.XY);
conf.disableCredits();
conf.setTitle("Height vs Weight");
conf.setSubTitle("Polygon series in Vaadin Charts.");
Tooltip tooltip = conf.getTooltip();
tooltip.setHeaderFormat("{series.name}");
tooltip.setPointFormat("{point.x} cm, {point.y} kg");
XAxis xAxis = conf.getxAxis();
xAxis.setStartOnTick(true);
xAxis.setEndOnTick(true);
xAxis.setShowLastLabel(true);
xAxis.setTitle("Height (cm)");
YAxis yAxis = conf.getyAxis();
yAxis.setTitle("Weight (kg)");
AbstractLinePlotOptions plotOptions = new PlotOptionsScatter();
plotOptions.setThreshold(0);
DataSeries scatter = new DataSeries();
scatter.setPlotOptions(plotOptions);
scatter.setName("Observations");
fillScatter(scatter, points);
conf.addSeries(scatter);
return chart;
}
private void fillScatter(DataSeries series, int points) {
Random random = new Random();
for (int i = 0; i < points; i++) {
double x = random.nextDouble() * 30 + 150;
double y = 60;
if (random.nextBoolean()) {
y += random.nextDouble() * 15;
if (random.nextBoolean() && x > 170) {
y += random.nextDouble() * 30;
}
} else {
y -= random.nextDouble() * 20;
}
x = Math.floor(x * 10) / 10;
y = Math.floor(y * 10) / 10;
int colorNumber = (int) Math.floor((x - 150) / 30 * 255);
Color color = new SolidColor(colorNumber, 0, 255 - colorNumber);
DataSeriesItem item = new DataSeriesItem(x, y);
// item.setColor(color);
series.add(item);
}
}