for (int category = 0; category < 3; category++) {
double lastValue = 0, lastDev = 1;
for (int i = 0; i < 30; ++i) {
lastValue = lastValue + (random.nextBoolean() ? 1 : -1);
lastDev = lastDev + random.nextDouble() - 0.3;
chart.addValue(lastValue, lastDev, "Serie" + category, i, String.valueOf(Math.pow(2, i)));
}
}
try {
chart.setHeight(500).setWidth(600).save("/tmp/foobar.png");
} catch (IOException e) {