lightning storm

gistfile1.txt

// $Id: RandomMovementBot.java,v 1.2 2004/01/04 18:52:08 peter Exp $
package EH.kms;
import robocode.*;
import robocode.util.Utils;
import java.awt.geom.*;

public class LightningStorm extends AdvancedRobot {
	// random movement constants and variables
	// Credit goes to PEZ for RandomMovementBot
    static final double MAX_VELOCITY = 8;
    static final double WALL_MARGIN = 25;
    Point2D robotLocation;
    Point2D enemyLocation;
    double enemyDistance;
    double enemyAbsoluteBearing;
    double movementLateralAngle = 0.2;
	// gun variables
	static final int maxMatchLen = 30;
	static final int firePower = 2;
	static final int fireSpeed = 20 - firePower * 3;
	
	static int distance;

    public void run() {
        setAdjustRadarForGunTurn(true);
		setAdjustGunForRobotTurn(true);

        do {
            
		turnRadarRightRadians(distance = 1000000); 
        } while (true);
    }

    public void onScannedRobot(ScannedRobotEvent e) {
		// movement
        robotLocation = new Point2D.Double(getX(), getY());
        enemyAbsoluteBearing = getHeadingRadians() + e.getBearingRadians();
        enemyDistance = e.getDistance();
        enemyLocation = vectorToLocation(enemyAbsoluteBearing, enemyDistance, robotLocation);
		move();
		
		int matchLen = maxMatchLen;
		double a;
		int dist;
		int matchPos;
		int i;

		// variables
		if ((a = getVelocity()) == 0) {
		}
		
		if ((dist = (int) e.getDistance()) < distance + 32) {
            
			a = e.getBearingRadians() + getHeadingRadians();
				
			setTurnRadarRightRadians(Double.POSITIVE_INFINITY 
				* Utils.normalRelativeAngle(a - getRadarHeadingRadians()));
			
			enemyHistory = 
				String.valueOf((char) Math.rint(
					e.getVelocity() * Math.sin(e.getHeadingRadians() - a)))
				.concat(enemyHistory);
			while(
				(matchPos = 
					enemyHistory.indexOf(
						enemyHistory.substring(0, matchLen--), 
						i = dist / fireSpeed)) 
				< 0);
			
			do {
				a += (double) (short) enemyHistory.charAt(--matchPos) / dist;
			} while (--i > 0);
			setTurnGunRightRadians(
				Utils.normalRelativeAngle(a - getGunHeadingRadians()));
			
			if (getEnergy() < 0.5) {
				return;
			}
			
			setFire(firePower);
		}
    }

	public void onRobotDeath(RobotDeathEvent e) {
		distance = 1000000;
	}
    // Always try to move a bit further away from the enemy.
    // Only when the walls forces us we will close in on the enemy. We never bounce of walls.
    void move() {
		if (Math.random() < 0.06) {
			movementLateralAngle *= -1;
		}
	Point2D robotDestination = null;
	double tries = 0;
	do {
	    robotDestination = vectorToLocation(absoluteBearing(enemyLocation, robotLocation) + movementLateralAngle,
		    enemyDistance * (1.1 - tries / 100.0), enemyLocation);
	    tries++;
	} while (tries < 100 && !fieldRectangle(WALL_MARGIN).contains(robotDestination));
	goTo(robotDestination);
    }

    RoundRectangle2D fieldRectangle(double margin) {
        return new RoundRectangle2D.Double(margin, margin,
	    getBattleFieldWidth() - margin * 2, getBattleFieldHeight() - margin * 2, 75, 75);
    }

    void goTo(Point2D destination) {
        double angle = Utils.normalRelativeAngle(absoluteBearing(robotLocation, destination) - getHeadingRadians());
	double turnAngle = Math.atan(Math.tan(angle));
        setTurnRightRadians(turnAngle);
        setAhead(robotLocation.distance(destination) * (angle == turnAngle ? 1 : -1));
	// Hit the brake pedal hard if we need to turn sharply
	setMaxVelocity(Math.abs(getTurnRemaining()) > 33 ? 0 : MAX_VELOCITY);
    }

    static Point2D vectorToLocation(double angle, double length, Point2D sourceLocation) {
	return vectorToLocation(angle, length, sourceLocation, new Point2D.Double());
    }

    static Point2D vectorToLocation(double angle, double length, Point2D sourceLocation, Point2D targetLocation) {
        targetLocation.setLocation(sourceLocation.getX() + Math.sin(angle) * length,
            sourceLocation.getY() + Math.cos(angle) * length);
	return targetLocation;
    }

    static double absoluteBearing(Point2D source, Point2D target) {
        return Math.atan2(target.getX() - source.getX(), target.getY() - source.getY());
    }
	
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