// Author: Paul Gries
// Written: 27 June 1997
// Last revised: 29 June 1997

// Simulate trains running around a track.

import java.io.*;
import java.awt.*;

// class TrainSimulation
// ----------------------------------------------------------------------
// The class TrainSimulation contains all the methods and instance variables
// neccessary to keep track of and run the train simulation.

public class TrainSimulation extends Frame {
   
    // The Tracks on which the Trains run.
    public static Track[] tracks = new Track[4];
    
    // The Trains running on the Tracks.
    public static Train[] trains = new Train[8];
    
    // The ThreadGroups; all Trains running on the same Track are in the same
    // ThreadGroup.
    ThreadGroup[] TG = new ThreadGroup[8];

    
    // main
    // ------------------------------------------------------------------
    // This is where it all starts.
    
    public static void main (String[] args) {
    
        TrainSimulation T = new TrainSimulation();
        
        // Track 2.
        T.tracks[0] = new Track();
        T.tracks[0].resize (540, 400);
        T.tracks[0].move(0, 0);
        T.tracks[0].setBackground(Color.white);
        T.tracks[0].show();
        
        T.trains[0] = new Train("Train 0");
        T.trains[0].addToTrain(new Engine());
        T.trains[0].addToTrain(new Caboose());
        
        T.trains[1] = new Train("Train 1");
        T.trains[1].addToTrain(new Engine());
        T.trains[1].addToTrain(new Caboose());
        

//        T.trains[2] = new Train();
//        T.trains[2].addToTrain(new Engine());
//        T.trains[2].addToTrain(new Caboose());

        T.trains[0].addToTrack(T.tracks[0], new Direction("west"), new GridLoc(2, 2));
        T.trains[0].setSpeed(620);
        T.trains[1].addToTrack(T.tracks[0], new Direction("south"), new GridLoc(1, 5));
        T.trains[1].setSpeed(350);
//        T.trains[2].addToTrack(T.tracks[0], new Direction("east"), new GridLoc(2, 2));
//        T.trains[2].setSpeed(754);
        
//        T.trains[0].start();
 //       T.trains[1].start();
//        T.trains[2].start();

/* Uncomment this to get more tracks!!!

        // Track 2.
        T.tracks[1] = new Track();
        T.tracks[1].resize (400, 400);
        T.tracks[1].move(410, 0);
        T.tracks[1].setBackground(Color.white);
        T.tracks[1].show();
        
        T.trains[3] = new Train();
        T.trains[3].addToTrain(new Engine());
        T.trains[4] = new Train();
        T.trains[4].addToTrain(new Engine());

        T.trains[3].addToTrack(T.tracks[1], new Direction("east"), new GridLoc(0, 0));
        T.trains[3].setSpeed(500);
        T.trains[4].addToTrack(T.tracks[1], new Direction("north"), new GridLoc(1, 2));
        T.trains[4].setSpeed(400);

        T.trains[3].start();
        T.trains[4].start();

        // Track 3.
        T.tracks[2] = new Track();
        T.tracks[2].resize (400, 400);
        T.tracks[2].move(400, 400);
        T.tracks[2].setBackground(Color.white);
        T.tracks[2].show();
        
        T.trains[5] = new Train();
        T.trains[5].addToTrain(new Engine());
        T.trains[6] = new Train();
        T.trains[6].addToTrain(new Engine());
        
        T.trains[5].addToTrack(T.tracks[2], new Direction("south"), new GridLoc(2, 4));
        T.trains[5].setSpeed(500);
        T.trains[6].addToTrack(T.tracks[2], new Direction("north"), new GridLoc(2, 0));
        T.trains[6].setSpeed(400);

        T.trains[5].start();
        T.trains[6].start();
*/
    }
}