Haxball Ball Trajectory Predictor (Beta)

Tenta prever onde a bola vai bater na parede em salas públicas de Haxball.
Version vom 14.04.2025. Aktuellste Version
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// ==UserScript==
// @name         Haxball Ball Trajectory Predictor (Beta)
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Tenta prever onde a bola vai bater na parede em salas públicas de Haxball.
// @author       Você
// @match        https://www.haxball.com/play*
// @grant        none
// ==/UserScript==

(function () {
    'use strict';

    const canvas = document.querySelector("canvas");

    if (!canvas) return;

    let lastPos = null;
    let lastTime = performance.now();

    function drawPrediction(ctx, ballPos, ballSpeed) {
        let predictedX = ballPos.x;
        let predictedY = ballPos.y;
        let vx = ballSpeed.x;
        let vy = ballSpeed.y;
        let steps = 300;

        ctx.strokeStyle = "yellow";
        ctx.beginPath();
        ctx.moveTo(predictedX, predictedY);

        for (let i = 0; i < steps; i++) {
            predictedX += vx;
            predictedY += vy;

            if (predictedX <= 0 || predictedX >= canvas.width) vx *= -1;
            if (predictedY <= 0 || predictedY >= canvas.height) vy *= -1;

            ctx.lineTo(predictedX, predictedY);
        }
        ctx.stroke();
    }

    function trackBall() {
        const ctx = canvas.getContext("2d");
        const imgData = ctx.getImageData(0, 0, canvas.width, canvas.height);
        const data = imgData.data;

        let found = false;
        let centerX = 0, centerY = 0, count = 0;

        for (let y = 0; y < canvas.height; y += 2) {
            for (let x = 0; x < canvas.width; x += 2) {
                const idx = (y * canvas.width + x) * 4;
                const r = data[idx], g = data[idx + 1], b = data[idx + 2];

                // Detecta a bola (geralmente branca com tom amarelado)
                if (r > 200 && g > 200 && b < 150) {
                    centerX += x;
                    centerY += y;
                    count++;
                }
            }
        }

        if (count > 0) {
            centerX = centerX / count;
            centerY = centerY / count;

            const now = performance.now();
            const dt = (now - lastTime) / 1000;

            if (lastPos) {
                const vx = (centerX - lastPos.x) / dt;
                const vy = (centerY - lastPos.y) / dt;

                // Redesenha a previsão
                drawPrediction(ctx, { x: centerX, y: centerY }, { x: vx, y: vy });
            }

            lastPos = { x: centerX, y: centerY };
            lastTime = now;
        }

        requestAnimationFrame(trackBall);
    }

    setTimeout(() => {
        console.log("[Previsão de Trajetória] Iniciando...");
        trackBall();
    }, 3000);
})();