My Second Robot

1

• My Second Robot

2
Anatomy of a Robot

• A robot consists of 3 independently moving parts
   
• Vehicle - determines the direction in which the
  robot will move
• Gun - determines the direction in which the robot
  will fire
• Radar - determines what the robot can see (if you
  turn on Visible scan arcs in options -gt
  Preferences, this will give you a feel for how
  much a robot can see)

3
Turning

• By default, moving a component will result in all
  components ON TOP of it moving accordingly (e.g.
  if the gun turns 90 degrees left, the radar will
  turn 90 degrees left). However, you can set
  components to adjust themselves automatically so
  that they are independent of the movement of
  other components, using these methods
• setAdjustGunForRobotTurn(boolean flag) If the
  flag is set to true, the gun will remain in the
  same direction while the vehicle turns.
• setAdjustRadarForRobotTurn(boolean flag) If the
  flag is set to true, the radar will remain in the
  same direction while the vehicle (and the gun)
  turns.
• setAdjustRadarForGunTurn(boolean flag) If the
  flag is set to true, the radar will remain in the
  same direction while the gun turns. It will also
  act as if setAdjustRadarForRobotTurn(true) has
  been called.

4
Basic Commands

• Below are the basic commands for moving the robot
  around, you can find more detailed definitions in
  the Robocode API.
• turnRight(double degree) and turnLeft(double
  degree) turn the robot by a specified degree.
• ahead(double distance) and back(double distance)
  move the robot by the specified distance these
  two methods return early if the robot hits a wall
  or another robot.
• turnGunRight(double degree) and
  turnGunLeft(double degree) turn the gun,
  independent of the vehicle's direction.
• turnRadarRight(double degree) and
  turnRadarLeft(double degree) turn the radar on
  top of the gun, independent of the gun's
  direction (and the vehicle's direction).

5
How to build a robot

• public class GenericRobot extends Robot public
  void run() while(true)

6
Useful Event-handlers

• onScannedRobot() - this method is called when the
  radar detects a robot.
• onHitByBullet() - this method is called when the
  robot is hit by a bullet.
• onHitRobot() - this method is called when your
  robot hits another robot.
• onHitWall() method this method is called when
  your robot hits a wall.

7
ProblemWhat does this robot do?

• import robocode.
• public class MySecondRobot extends Robot
•     public void run()
•         turnLeft(getHeading())
•         while(true)
•             ahead(1000)
•             turnRight(90)
•        
•    
•     public void onScannedRobot(ScannedRobotEvent
  e)
•         fire(1)
•    
•     public void onHitByBullet(HitByBulletEvent e)
  
•         turnLeft(180)
•    

8
Solution

• The robot begins by driving straight up
  (turnLeft(getHeading())). It turns right 90
  degrees whenever it hits something, so it moves
  orthogonally in a large rectangle. If hit by a
  bullet it changes direction (turnLeft(180)).