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3 - ScannedBotEvent

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Gear up for 3 - ScannedBotEvent 😎

Working with ScannedBotEvent

ScannedBotEvent is a key event in Robocode, fired automatically whenever your robot’s radar detects another robot. Almost every robot should override this method to respond to detected opponents.

onScannedBot(ScannedBotEvent event)

What it Does

This method is called when your robot sees another robot — i.e., when your radar scan “hits” another robot. You must override this method if you want your robot to respond to nearby opponents.

The bearing you receive is relative to your robot’s current heading.

Method Signature

public void onScannedBot(ScannedBotEvent event)

Parameters

  • event: An instance of ScannedBotEvent containing data about the scanned robot.

Event Data Includes:

MethodDescription
getScannedByBotId()Returns the ID of the bot that performed the scan.
getScannedBotId()Returns the ID of the scanned bot.
getX()X-coordinate of the scanned bot (center of the bot).
getY()Y-coordinate of the scanned bot (center of the bot).
getEnergy()Energy level of the scanned bot.
getDirection()Movement direction (angle) of the scanned bot in degrees.
getSpeed()Speed of the scanned bot (in units per turn).

Example:

@Override
public void onScannedBot(ScannedBotEvent event) {
    // 1. Remember where the opponent is
    double opponentX = event.getX();  // Opponent's X position
    double opponentY = event.getY();  // Opponent's Y position
 
    // 2. Remember where *we* are
    double myX = getX();           // My bot's X position
    double myY = getY();           // My bot's Y position
 
    // 3. Find the distance between us
    double dx = opponentX - myX;      // How far apart we are in X
    double dy = opponentY - myY;      // How far apart we are in Y
 
    // 4. Use the Pythagorean theorem to get the total distance
    double distance = Math.sqrt(dx * dx + dy * dy);
 
    System.out.println("Opponent detected at: " + distance + " pixels");
 
    // Fire with stronger power if close, weaker if far
    if (distance < 100) {
        fire(3);
    } else {
        fire(1);
    }
}

Summary:

  • Override onScannedBot to react to opponents.
  • Use the data in ScannedBotEvent to decide when and how to fire.

🡌 Back: System.out.println for Debugging ➡️ Next: HitByBulletEvent

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