Difference between revisions of "Circular Targeting"
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* Alisdair Owen's [http://www-106.ibm.com/developerworks/library/j-circular/ circular targeting tutorial] with iteration. | * Alisdair Owen's [http://www-106.ibm.com/developerworks/library/j-circular/ circular targeting tutorial] with iteration. | ||
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[[Category:Simple Targeting Strategies]] | [[Category:Simple Targeting Strategies]] | ||
[[Category:Code Snippets]] | [[Category:Code Snippets]] | ||
Revision as of 18:18, 1 April 2011
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
- Circular Targeting/Walkthrough - An in-depth example of creating a circular targeting algorithm in Robocode, authored by Dummy.
- NanoBot sized circular targeting example code
- Alisdair Owen's circular targeting tutorial with iteration.
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