/** Returns the convex hull of points in the specified file using the specified algorithm */
private static List<Point> findConvexHull(String path, Class<? extends ConvexHullAlg> alg)
throws IOException {
// read points from file
List<Point> input = PointUtils.readFromFile(path);
// find convex hull
return ConvexHullAlg.create(input, alg).execute();
}
/** Main entry point */
public static void main(String[] args) throws IOException {
try {
// generate specified number of points at random
// this means that no algorithms should have a numeric code in convexHullAlgs()
Stream<Point> points =
PointUtils.random(Integer.parseInt(args[0]), Integer.parseInt(args[1]));
PointUtils.output((Iterable<Point>) points::iterator);
} catch (NumberFormatException e) {
// assume convex hull is to be found
// look up the algorithm by the code
final String code = args[1].toLowerCase(Locale.ENGLISH);
Class<? extends ConvexHullAlg> alg = convexHullAlgs().get(code);
if (alg != null) {
PointUtils.output(findConvexHull(args[0], alg));
} else {
// not sure what user wants
help();
}
}
}
