SuperBoxBot

SuperBoxBot is a member of the Super Sample Bots. It was created by Exauge. It is intended to provide new robocoders with a new challenge after beating all of the sample robots. This robot demonstrates a number of things such as Melee Strategy, and some of the less commonly used Java operators such as ternary operators and the remainder operand. Despite it's overly large size for what it does, it also shows some ways to conserve codesize.

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Movement

SuperBoxBot goes to the nearest corner and starts moving in a box. There is a 15% chance it will randomly decide to switch directions.

Targeting

SuperBoxBot uses Head-On Targeting which is popular among lightweight melee bots. It can be surprisingly effective.

Code

package supersample;

import java.awt.Color;
import robocode.AdvancedRobot;
import robocode.HitByBulletEvent;
import robocode.ScannedRobotEvent;
import robocode.util.Utils;

/*
 * SuperBoxBot - a SuperSampleBot by Exauge
 * 
 * This robot demonstrates basic melee strategy such as
 *  -Picking targets
 *  -Melee movement strategy
 *  
 *  It also demonstrates some of the Java API operators including
 *  remainder and ternary.
 *  
 *  If you need help with any of these operators look here:
 *  http://download.oracle.com/javase/tutorial/java/nutsandbolts/opsummary.html
 *  A bit of googling always helps too.
 * 
 * Movement:
 * This robot goes to the nearest corner, and then moves in a box.
 * There is a 15% chance it will change direction when the enemy fires.
 * 
 * Targeting:
 * At first this robot will target the first robot it sees, but it switches
 * to any robot that hits it. It uses Head-on targeting which is popular
 * among lightweight melee bots.
 */
public class SuperBoxBot extends AdvancedRobot{

   private boolean moved = false; // if we need to move or turn
   private boolean inCorner = false; // if we are in a corner
   private String targ; // what robot to target
   private byte spins = 0; // spin counter
   private byte dir = 1; // direction to move
   private short prevE; // previous energy of robot we're targeting

   @Override
   public void run(){
      setColors(Color.PINK, Color.BLACK, Color.CYAN); // set the colors
      setAdjustGunForRobotTurn(true); // when the robot turns, adjust gun in opposite dir
      setAdjustRadarForGunTurn(true); // when the gun turns, adjust radar in opposite dir
      while(true){ // for radar lock (aka "Narrow Lock")
         turnRadarLeftRadians(1); // continually turn the radar left
      }
   }

   @Override
   public void onHitByBullet(HitByBulletEvent e){ // if hit buy a bullet
      targ = e.getName(); // target the one who hit us!
   }

   @Override
   public void onScannedRobot(ScannedRobotEvent e){
      if(targ == null || spins > 6){ // if we don't have a target
         targ = e.getName(); // choose the first robot scanned
      }

      if(getDistanceRemaining() == 0 && getTurnRemaining() == 0){ // not moving or turning
         if(inCorner){
            if(moved){ // if last movement cycle we were moving,
               setTurnLeft(90); // turn this cycle
               moved = false; // and move next cycle
            }
            else{ // else if last cycle we were turning
               setAhead(160 * dir); // move this cycle
               moved = true; // and turn next cycle
            }
         }
         else{
            // if we aren't going N/S go north or south
            if((getHeading() % 90) != 0){
               setTurnLeft((getY() > (getBattleFieldHeight() / 2)) ? getHeading()
                     : getHeading() - 180);
            }
            // if we aren't at the top or bottom, go to whichever is closer
            else if(getY() > 30 && getY() < getBattleFieldHeight() - 30){
               setAhead(getHeading() > 90 ? getY() - 20 : getBattleFieldHeight() - getY()
                     - 20);
            }
            // if we aren't facing toward East/West, face toward it
            else if(getHeading() != 90 && getHeading() != 270){
               if(getX() < 350){
                  setTurnLeft(getY() > 300 ? 90 : -90);
               }
               else{
                  setTurnLeft(getY() > 300? -90 : 90);
               }
            }
            // if we aren't at the left or right, go to whichever is closer
            else if(getX() > 30 && getX() < getBattleFieldWidth() - 30){
               setAhead(getHeading() < 180 ? getX() - 20 : getBattleFieldWidth() - getX()
                     - 20);
            }
            // we are in the corner; turn and start moving
            else if(getHeading() == 270){
               setTurnLeft(getY() > 200 ? 90 : 180);
               inCorner = true;
            }
            // we are in the corner; turn and start moving
            else if(getHeading() == 90){
               setTurnLeft(getY() > 200 ? 180 : 90);
               inCorner = true;
            }
         }
      }
      if(e.getName().equals(targ)){ // if the robot scanned is our target
         spins = 0; // reset radar spin counter
         
         // if the enemy fires, with a 15% chance, 
         if((prevE < (prevE = (short)e.getEnergy())) && Math.random() > .85){
            dir *= -1; // change direction
         }
         
         setTurnGunRightRadians(Utils.normalRelativeAngle((getHeadingRadians() + e
               .getBearingRadians()) - getGunHeadingRadians())); // move gun toward them
         
         if(e.getDistance() < 200){ // the the enemy is further than 200px
            setFire(3); // fire full power
         }
         else{
            setFire(2.4); // else fire 2.4
         }
         
         double radarTurn = getHeadingRadians() + e.getBearingRadians()
               - getRadarHeadingRadians();
         setTurnRadarRightRadians(2 * Utils.normalRelativeAngle(radarTurn)); // lock radar
      }
      else if(targ != null){ // else
         spins++; // add one to spin count
      }
   }

}