Corners.java

/*******************************************************************************
 * Copyright (c) 2001, 2010 Mathew A. Nelson and Robocode contributors
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://robocode.sourceforge.net/license/epl-v10.html
 *
 * Contributors:
 *     Mathew A. Nelson
 *     - Initial implementation
 *     Flemming N. Larsen
 *     - Maintainance
 *******************************************************************************/
package sample;


import robocode.DeathEvent;
import robocode.Robot;
import robocode.ScannedRobotEvent;
import static robocode.util.Utils.normalRelativeAngleDegrees;

import java.awt.*;


/**
 * Corners - a sample robot by Mathew Nelson, and maintained by Flemming N. Larsen
 * <p/>
 * This robot moves to a corner, then swings the gun back and forth.
 * If it dies, it tries a new corner in the next round.
 */
public class Corners extends Robot {
	int others; // Number of other robots in the game
	static int corner = 0; // Which corner we are currently using
	// static so that it keeps it between rounds.
	boolean stopWhenSeeRobot = false; // See goCorner()

	/**
	 * run:  Corners' main run function.
	 */
	public void run() {
		// Set colors
		setBodyColor(Color.red);
		setGunColor(Color.black);
		setRadarColor(Color.yellow);
		setBulletColor(Color.green);
		setScanColor(Color.green);

		// Save # of other bots
		others = getOthers();

		// Move to a corner
		goCorner();

		// Initialize gun turn speed to 3
		int gunIncrement = 3;

		// Spin gun back and forth
		while (true) {
			for (int i = 0; i < 30; i++) {
				turnGunLeft(gunIncrement);
			}
			gunIncrement *= -1;
		}
	}

	/**
	 * goCorner:  A very inefficient way to get to a corner.  Can you do better?
	 */
	public void goCorner() {
		// We don't want to stop when we're just turning...
		stopWhenSeeRobot = false;
		// turn to face the wall to the "right" of our desired corner.
		turnRight(normalRelativeAngleDegrees(corner - getHeading()));
		// Ok, now we don't want to crash into any robot in our way...
		stopWhenSeeRobot = true;
		// Move to that wall
		ahead(5000);
		// Turn to face the corner
		turnLeft(90);
		// Move to the corner
		ahead(5000);
		// Turn gun to starting point
		turnGunLeft(90);
	}

	/**
	 * onScannedRobot:  Stop and fire!
	 */
	public void onScannedRobot(ScannedRobotEvent e) {
		// Should we stop, or just fire?
		if (stopWhenSeeRobot) {
			// Stop everything!  You can safely call stop multiple times.
			stop();
			// Call our custom firing method
			smartFire(e.getDistance());
			// Look for another robot.
			// NOTE:  If you call scan() inside onScannedRobot, and it sees a robot,
			// the game will interrupt the event handler and start it over
			scan();
			// We won't get here if we saw another robot.
			// Okay, we didn't see another robot... start moving or turning again.
			resume();
		} else {
			smartFire(e.getDistance());
		}
	}

	/**
	 * smartFire:  Custom fire method that determines firepower based on distance.
	 *
	 * @param robotDistance the distance to the robot to fire at
	 */
	public void smartFire(double robotDistance) {
		if (robotDistance > 200 || getEnergy() < 15) {
			fire(1);
		} else if (robotDistance > 50) {
			fire(2);
		} else {
			fire(3);
		}
	}

	/**
	 * onDeath:  We died.  Decide whether to try a different corner next game.
	 */
	public void onDeath(DeathEvent e) {
		// Well, others should never be 0, but better safe than sorry.
		if (others == 0) {
			return;
		}

		// If 75% of the robots are still alive when we die, we'll switch corners.
		if ((others - getOthers()) / (double) others < .75) {
			corner += 90;
			if (corner == 270) {
				corner = -90;
			}
			out.println("I died and did poorly... switching corner to " + corner);
		} else {
			out.println("I died but did well.  I will still use corner " + corner);
		}
	}
}