Shaping.java

import vizdoom.*;

import java.util.*;
import java.lang.*;

public class Shaping {

    public static void main (String[] args) {

        System.out.println("\n\nSHAPING EXAMPLE\n");


        // Create DoomGame instance. It will run the game and communicate with you.
        DoomGame game = new DoomGame();

        // Health gathering scenario has scripted shaping reward.
        game.loadConfig("../../scenarios/health_gathering.cfg");
        game.setViZDoomPath("../../bin/vizdoom");

        // Sets path to doom2 iwad resource file which contains the actual doom game-> Default is "./doom2.wad".
        game.setDoomGamePath("../../bin/freedoom2.wad");
        //game.setDoomGamePath("../../bin/doom2.wad");   // Not provided with environment due to licences.

        // Sets resolution. Default is 320X240
        game.setScreenResolution(ScreenResolution.RES_320X240);

        // Initialize the game. Further configuration won't take any effect from now on.
        game.init();

        List<double[]> actions = new ArrayList<double[]>();
        actions.add(new double[] {1, 0, 1});
        actions.add(new double[] {0, 1, 1});
        actions.add(new double[] {0, 0, 1});

        Random ran = new Random();

        // Run this many episodes
        int episodes = 10;

        // Use this to remember last shaping reward value.
        double lastTotalShapingReward = 0;
        for (int i = 0; i < episodes; ++i) {

            System.out.println("Episode #" + (i + 1));

            // Starts a new episode. It is not needed right after init() but it doesn't cost much and the loop is nicer.
            game.newEpisode();

            while (!game.isEpisodeFinished()) {

                // Get the state
                GameState state = game.getState();

                // Make random action and get reward
                double reward = game.makeAction(actions.get(ran.nextInt(3)));

                // Retrieve the shaping reward
                double _ssr = game.getGameVariable(GameVariable.USER1); // Get value of scripted variable
                double ssr = game.doomFixedToDouble(_ssr);              // If value is in DoomFixed format project it to double
                double sr = ssr - lastTotalShapingReward;
                lastTotalShapingReward = ssr;

                System.out.println("State #" + state.number);
                System.out.println("Health: " + Arrays.toString(state.gameVariables));
                System.out.println("Action reward: " + reward);
                System.out.println("Action shaping reward: " + sr);
                System.out.println("=====================");

            }

        System.out.println( "Episode finished.");
        System.out.println("Total reward: " + game.getTotalReward());
        System.out.println ("************************");

        }

        // It will be done automatically in destructor but after close You can init it again with different settings.
        game.close();
    }
}