SuperRamFire

SuperRamFire
Author(s)	CrazyBassoonist
Extends	AdvancedRobot
Targeting	Circular Targeting
Movement	Orbital Movement, Ramming Movement
Current Version	1.0
Code License	Public domain
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SuperRamFire is a part of the Super Sample Bots set by CrazyBassoonist. It is intended to provide new Robocoders with a new challenge after beating all of the sample robots.

Movement

SuperRamFire tries to ram its opponent (hence the name). It changes its turn direction and chance-to-reverse based on distance from the enemy.

Targeting

SuperRamFire uses Circular Targeting.

Code

package supersample;

import java.awt.Color;
import java.awt.geom.Point2D;

import robocode.*;
import robocode.util.Utils;
/**
 * SuperSpinBot - a Super Sample Robot by CrazyBassoonist based on the robot RamFire by Mathew Nelson and maintained by Flemming N. Larsen.
 * 
 * This robot tries to ram it's opponents.
 *
 */
public class SuperRamFire extends AdvancedRobot {
	
	//These are constants. One advantage of these is that the logic in them (such as 20-3*BULLET_POWER)
	//does not use codespace, making them cheaper than putting the logic in the actual code.
	final static double BULLET_POWER=3;//Our bulletpower.
	final static double BULLET_DAMAGE=BULLET_POWER*4;//Formula for bullet damage.
	final static double BULLET_SPEED=20-3*BULLET_POWER;//Formula for bullet speed.
	
	//Variables
	static double dir=1;
	static double oldEnemyHeading;
	static double enemyEnergy;

	public void run(){
		//RamFire Colors
		setBodyColor(Color.lightGray);
		setGunColor(Color.gray);
		setRadarColor(Color.darkGray);
		
		setAdjustGunForRobotTurn(true);
		setAdjustRadarForGunTurn(true);
		setTurnRadarRightRadians(Double.POSITIVE_INFINITY);
	}

	public void onScannedRobot(ScannedRobotEvent e){
		double absBearing=e.getBearingRadians()+getHeadingRadians();

		//This makes the amount we want to turn be perpendicular to the enemy.
		double turn=absBearing+Math.PI/2;
		
		//This formula is used because the 1/e.getDistance() means that as we get closer to the enemy, we will turn to them more sharply. 
		//We want to do this because it reduces our chances of being defeated before we reach the enemy robot.
		turn-=Math.max(0.5,(1/e.getDistance())*100)*dir;
		
		setTurnRightRadians(Utils.normalRelativeAngle(turn-getHeadingRadians()));
		
		//This block of code detects when an opponents energy drops.
		if(enemyEnergy>(enemyEnergy=e.getEnergy())){
			
			//We use 300/e.getDistance() to decide if we want to change directions.
			//This means that we will be less likely to reverse right as we are about to ram the enemy robot.
			if(Math.random()>200/e.getDistance()){
				dir=-dir;
			}
		}
		
		//This line makes us slow down when we need to turn sharply.
		setMaxVelocity(400/getTurnRemaining());
		
		setAhead(100*dir);
		
		//Finding the heading and heading change.
		double enemyHeading = e.getHeadingRadians();
		double enemyHeadingChange = enemyHeading - oldEnemyHeading;
		oldEnemyHeading = enemyHeading;
		
		/*This method of targeting is know as circular targeting; you assume your enemy will
		 *keep moving with the same speed and turn rate that he is using at fire time.The 
		 *base code comes from the wiki.
		*/
		double deltaTime = 0;
		double predictedX = getX()+e.getDistance()*Math.sin(absBearing);
		double predictedY = getY()+e.getDistance()*Math.cos(absBearing);
		while((++deltaTime) * BULLET_SPEED <  Point2D.Double.distance(getX(), getY(), predictedX, predictedY)){	
			
			//Add the movement we think our enemy will make to our enemy's current X and Y
			predictedX += Math.sin(enemyHeading) * e.getVelocity();
			predictedY += Math.cos(enemyHeading) * e.getVelocity();
			
			
			//Find our enemy's heading changes.
			enemyHeading += enemyHeadingChange;
			
			//If our predicted coordinates are outside the walls, put them 18 distance units away from the walls as we know 
			//that that is the closest they can get to the wall (Bots are non-rotating 36*36 squares).
			predictedX=Math.max(Math.min(predictedX,getBattleFieldWidth()-18),18);
			predictedY=Math.max(Math.min(predictedY,getBattleFieldHeight()-18),18);
			
		}
		//Find the bearing of our predicted coordinates from us.
		double aim = Utils.normalAbsoluteAngle(Math.atan2(  predictedX - getX(), predictedY - getY()));

		//Aim and fire.
		setTurnGunRightRadians(Utils.normalRelativeAngle(aim - getGunHeadingRadians()));
		setFire(BULLET_POWER);

		setTurnRadarRightRadians(Utils.normalRelativeAngle(absBearing-getRadarHeadingRadians())*2);
	}

	public void onBulletHit(BulletHitEvent e){
		enemyEnergy-=BULLET_DAMAGE;
	}

	public void onHitWall(HitWallEvent e){
		dir=-dir;
	}
}