private static ArrayList<Point> getInputPoints(String path) {
        try (BufferedReader br = new BufferedReader(new FileReader(new File(path)))) {
            ArrayList<Point> points = new ArrayList<>();
            String line;
            while ((line = br.readLine()) != null) {
                // process the line.
                String[] data = line.split(",");
                double x = Double.parseDouble(data[0].trim());
                double y = Double.parseDouble(data[1].trim());
                int color = Integer.parseInt(data[2].trim());
                points.add(new Point(x, y, color));
            }
            return points;
        } catch(Exception e) {
            return null;
        }
    }