Difference between revisions of "Circular Targeting"
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(Removed a dead link and replaced another dead link with an updated one.) |
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* [[Circular Targeting/Walkthrough]] - An in-depth example of creating a circular targeting algorithm in Robocode, authored by [[Dummy]]. | * [[Circular Targeting/Walkthrough]] - An in-depth example of creating a circular targeting algorithm in Robocode, authored by [[Dummy]]. | ||
| − | + | * Alisdair Owen's [https://www.ibm.com/developerworks/library/j-circular/index.html circular targeting tutorial] with iteration. | |
| − | * Alisdair Owen's [ | ||
{{Targeting Navbox}} | {{Targeting Navbox}} | ||
[[Category:Simple Targeting Strategies]] | [[Category:Simple Targeting Strategies]] | ||
[[Category:Code Snippets]] | [[Category:Code Snippets]] | ||
Revision as of 12:46, 24 December 2017
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.
- Alisdair Owen's circular targeting tutorial with iteration.
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