Circular Targeting

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Description

A method of targeting which assumes that the target will continue moving with the same turn rate and at the same speed.

Example

This is the code used in WaveSurfing Challenge Bot C:

//Add import robocode.util.* for Utils and import java.awt.geom.* for Point2D
//This code goes in your onScannedRobot() event handler
 
double bulletPower = Math.min(3.0,getEnergy());
double myX = getX();
double myY = getY();
double absoluteBearing = getHeadingRadians() + e.getBearingRadians();
double enemyX = getX() + e.getDistance() * Math.sin(absoluteBearing);
double enemyY = getY() + e.getDistance() * Math.cos(absoluteBearing);
double enemyHeading = e.getHeadingRadians();
double enemyHeadingChange = enemyHeading - oldEnemyHeading;
double enemyVelocity = e.getVelocity();
oldEnemyHeading = enemyHeading;
 
double deltaTime = 0;
double battleFieldHeight = getBattleFieldHeight(), 
       battleFieldWidth = getBattleFieldWidth();
double predictedX = enemyX, predictedY = enemyY;
while((++deltaTime) * (20.0 - 3.0 * bulletPower) < 
      Point2D.Double.distance(myX, myY, predictedX, predictedY)){		
	predictedX += Math.sin(enemyHeading) * enemyVelocity;
	predictedY += Math.cos(enemyHeading) * enemyVelocity;
	enemyHeading += enemyHeadingChange;
	if(	predictedX < 18.0 
		|| predictedY < 18.0
		|| predictedX > battleFieldWidth - 18.0
		|| predictedY > battleFieldHeight - 18.0){
 
		predictedX = Math.min(Math.max(18.0, predictedX), 
		    battleFieldWidth - 18.0);	
		predictedY = Math.min(Math.max(18.0, predictedY), 
		    battleFieldHeight - 18.0);
		break;
	}
}
double theta = Utils.normalAbsoluteAngle(Math.atan2(
    predictedX - getX(), predictedY - getY()));
 
setTurnRadarRightRadians(Utils.normalRelativeAngle(
    absoluteBearing - getRadarHeadingRadians()));
setTurnGunRightRadians(Utils.normalRelativeAngle(
    theta - getGunHeadingRadians()));
fire(3);

See also

v  d  e 

Targeting

Quick
Statistical
Log-Based
Heuristics
Hybrid
Firing Angle
Energy
Terms
Related
See Also: Category:Targeting
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