5 - Reactionary Logic

Time to explore 5 - Reactionary Logic 🤖

⚡ Reacting to Battle Input

In Robocode, your bot needs to make decisions on the fly. This means combining loops (like while) and conditions (like if) with event-driven logic.

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🔍 Full Example: Radar Scan + Distance Tracking

This example spins the radar and reacts to nearby bots using their X and Y position.

import dev.robocode.tankroyale.botapi.*;
import dev.robocode.tankroyale.botapi.events.*;
 
public class ReactiveBot extends Bot {
 
    private double lastEnemyX = 0;
    private double lastEnemyY = 0;
 
    public ReactiveBot() {
        super(BotInfo.fromFile("ReactiveBot.json"));
    }
 
    @Override
    public void run() {
        while (true) {
            turnRadarRight(360);  // Spin radar to look for enemies
        }
    }
 
    @Override
    public void onScannedBot(ScannedBotEvent e) {
        lastEnemyX = e.getX();
        lastEnemyY = e.getY();
 
        double myX = getX();
        double myY = getY();
 
        double dx = lastEnemyX - myX;
        double dy = lastEnemyY - myY;
        double distance = Math.hypot(dx, dy);
 
        if (distance < 150) {
            fire(3);  // Use strong firepower when close
        } else {
            fire(1);  // Use weak firepower when far
        }
    }
}

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🧠 How It Works

• run() spins the radar in a loop.
• When onScannedBot triggers, we store the enemy’s location.
• We use Math.hypot(dx, dy) to calculate distance.
• The if statement checks that distance to decide firepower.

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