public String draw(String title, Map<String, List<Double>> data, List<String> xLabels) {
/*
Scale values
*/
Double maxValue = Double.MIN_VALUE;
Double minValue = Double.MAX_VALUE;
for (List<Double> doubles : data.values()) {
for (Double d : doubles) {
maxValue = Math.max(d, maxValue);
minValue = Math.min(d, minValue);
}
}
double k = 100.0 / maxValue;
HashMap<String, List<Double>> scaled = new HashMap<>();
for (Map.Entry<String, List<Double>> entry : data.entrySet()) {
List<Double> value = new ArrayList<>();
for (Double next : entry.getValue()) {
value.add(next * k);
}
scaled.put(entry.getKey(), value);
}
data = scaled;
Random rnd = new Random(42);
// Defining lines
ArrayList<Line> lines = new ArrayList<>();
for (Map.Entry<String, List<Double>> entry : data.entrySet()) {
Color color =
Color.newColor(
String.format("%02X%02X%02X", rnd.nextInt(256), rnd.nextInt(256), rnd.nextInt(256)));
Line line = Plots.newLine(Data.newData(entry.getValue()), color, entry.getKey());
line.setLineStyle(LineStyle.newLineStyle(3, 1, 0));
line.addShapeMarkers(Shape.DIAMOND, color, 12);
line.addShapeMarkers(Shape.DIAMOND, Color.WHITE, 8);
lines.add(line);
}
// Defining chart.
LineChart chart = GCharts.newLineChart(lines);
chart.setSize(600, 450);
chart.setTitle(title, WHITE, 14);
int stepCount = 5;
chart.setGrid(100 / stepCount, 100 / stepCount, 3, 3);
// Defining axis info and styles
// Make x axis
AxisStyle axisStyle = AxisStyle.newAxisStyle(WHITE, 12, AxisTextAlignment.CENTER);
AxisLabels xAxis = AxisLabelsFactory.newAxisLabels(xLabels);
xAxis.setAxisStyle(axisStyle);
// Calculate y axis labels
List<String> yLabels = new ArrayList<>();
for (int i = 0; i <= stepCount; i++) {
yLabels.add(String.valueOf(maxValue / stepCount * i));
}
AxisLabels yAxis = AxisLabelsFactory.newAxisLabels(yLabels);
yAxis.setAxisStyle(axisStyle);
// Adding axis info to chart.
chart.addXAxisLabels(xAxis);
chart.addYAxisLabels(yAxis);
// Defining background and chart fills.
chart.setBackgroundFill(Fills.newSolidFill(Color.newColor("1F1D1D")));
LinearGradientFill fill = Fills.newLinearGradientFill(0, Color.newColor("363433"), 100);
fill.addColorAndOffset(Color.newColor("2E2B2A"), 0);
chart.setAreaFill(fill);
return chart.toURLString();
}
