illectro.github.io/index.html at main · illectro/illectro.github.io · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>LFR (A-N Radio Range) Navigation Simulator</title>
    <style>
        body { margin: 0; background: #000; color: #0f0; font-family: monospace; text-align: center; }
        canvas { background: #111; display: block; margin: 20px auto; border: 2px solid #0f0; }
        #info { font-size: 24px; margin: 10px; }
        #instructions { max-width: 800px; margin: 20px auto; font-size: 18px; }
    </style>
</head>
<body>
    <h1>Low Frequency Radio Range (A-N) Simulator</h1>
    <div id="info">Heading: <span id="heading">0</span>° | Fuel: <span id="fuel">100</span>% | Dist: <span id="distance">1000</span> </div>
    <div id="debug">GainA: <span id="gain_a">0</span> | GainN: <span id="gain_n">0</span> | Difficulty: <span id="difficulty">0</span></div>
    <canvas id="canvas" width="600" height="600"></canvas>
    <div id="instructions">
        <p><strong>Controls:</strong> Left Arrow (←) or A = turn left | Right Arrow (→) or D = turn right</p>
        <p><strong>Goal:</strong> Fly towards the radio beacon at the center of the map using only audio cues.</p>
        <p>You will hear overlapping Morse code: "A" (· —) in some sectors, "N" (— ·) in others.<br>
        When perfectly on one of the four equisignal beams, the A and N overlap exactly, producing a steady continuous tone.<br>
        If you hear distinct "dit-dah" (A) you are in the A zone – turn accordingly.<br>
        If you hear distinct "dah-dit" (N) you are in the N zone.<br>
        Find and follow the steady tone to reach the beacon.</p>
        <p>Fuel decreases over time. Reach the beacon (get very close) before fuel runs out!</p>
        <p>Click the page first to enable sound (browser requirement).</p>
        <p>'X' key switches to practice mode. 'Z' resets difficulty to 0</p>
    </div>

    <script>
        const canvas = document.getElementById('canvas');
        const ctx = canvas.getContext('2d');
        const headingEl = document.getElementById('heading');
        const fuelEl = document.getElementById('fuel');
        const distEl = document.getElementById('distance');
        const gainaEl = document.getElementById('gain_a');
        const gainnEl = document.getElementById('gain_n');
        const difficultyEl = document.getElementById('difficulty');

        // Game parameters
        let playerX = 50;          // Player position relative to beacon (beacon at 0,0)
        let playerY = -200;       // Start south of beacon
        let playerHeading = 40;  // Degrees, 0 = north, 90 = east, etc.
        let turnRate = 1;         // Degrees per frame when turning
        let speed = 0.25;            // Units per frame
        let fuel = 100;
        let fuelRate = 0.005;      // % per frame
        let beaconAngle = -45;
        let difficulty = 0;
        let windX = 0;
        let windY = 0;
        let pause = 100;

        // Audio setup
        let audioCtx = null;
        let aOsc = null, aGain = null;
        let nOsc = null, nGain = null;
        const frequency = 1020;    // Tone frequency (Hz)
        const wpm = 12;           // Morse speed (words per minute)
        const ditTime = 1200 / wpm; // ms per dit
        const dashTime = 3 * ditTime;
        const elementGap = ditTime;
        const letterGap = 3 * ditTime;

        // Morse patterns (1 = on, 0 = off)
        const patternA = [1, ditTime, 0, dashTime, 1, dashTime, 0, ditTime];


        let lastUpdate = 0;
        let phase = 0; // ms into the repeating cycle

        function resetState(diff) {
            // Game parameters
            difficulty = diff;
            if(difficulty == 0) {
                // standard start position
                playerX = 50;          // Player position relative to beacon (beacon at 0,0)
                playerY = -200;       // Start south of beacon
                playerHeading = 40;  // Degrees, 0 = north, 90 = east, etc.
            } else {
                // random start position
                ang = Math.random() * 2 * Math.PI
                dist = 150 + Math.random() * 100
                playerX = Math.sin(ang) * dist
                playerY = Math.cos(ang) * dist
                playerHeading = (ang + Math.PI * 0.75 + Math.random() * Math.PI * 0.5) * 180/Math.PI
                if(playerHeading > 360){
                    playerHeading -= 360
                }
            }
            // wind just gets stronger
            windSpeed = difficulty * 0.01;
            windAng = Math.random() * 2 * Math.PI;
            windX = -Math.sin(ang) * windSpeed;
            windY = -Math.cos(ang) * windSpeed;
            fuel = 100;
            pause = 100;
        }

        function initAudio() {
            if (audioCtx) return;
            audioCtx = new (window.AudioContext || window.webkitAudioContext)();
            // combined signal
            aOsc = audioCtx.createOscillator();
            aOsc.frequency.value = frequency;
            aGain = audioCtx.createGain();
            aGain.gain.value = 0;
            aOsc.connect(aGain).connect(audioCtx.destination);
            aOsc.start();
        }

        function updateAudio(deltaMs, a , n) {
            phase += deltaMs;
            // Cycle length = pattern repeat time
            const cycleLength = ( ditTime + dashTime) * 2 ;
            if (phase >= cycleLength) phase -= cycleLength;

            let t = phase;

            // A signal strength
            let aOn = false;
            if (t < dashTime) { aOn = false; }
            else if (t < dashTime+ditTime) { aOn = true;}
            else if (t < dashTime+ditTime*2) { aOn = false;}
            else {aOn = true;}
            if(aOn) { aGain.gain.value = a;}
            else {aGain.gain.value = n;}

        }

        function getSignalStrengths() {
            // Angle from player to beacon
            let angleToBeacon = Math.atan2(playerY, playerX) + beaconAngle *Math.PI/180;
            distance = Math.sqrt(playerY*playerY + playerX*playerX)
            sigPow = 1.1 - (distance/500)
            if(sigPow > 1) { sigPow = 1; }
            else if(sigPow < 0.1) {sigPow = 0.1;}
            // zone of confusion
            if(distance < 10) { sigPow = distance*0.1; }


            return { a: Math.abs(Math.sin(angleToBeacon)*sigPow), n: Math.abs(Math.cos(angleToBeacon)*sigPow)}
        }


        // Controls
        const keys = {};
        window.addEventListener('keydown', e => { keys[e.key] = true; });
        window.addEventListener('keyup', e => { keys[e.key] = false; });
        document.body.addEventListener('click', initAudio); // Unlock audio on user gesture

        function gameLoop(timestamp) {
            if (!lastUpdate) lastUpdate = timestamp;
            const deltaMs = timestamp - lastUpdate;
            lastUpdate = timestamp;

            // Input
            if (keys['ArrowLeft'] || keys['a'] || keys['A']) playerHeading += turnRate;
            if (keys['ArrowRight'] || keys['d'] || keys['D']) playerHeading -= turnRate;
            // x key switches to practice mode
            if (keys['x'] || keys['X']) difficulty = -1;
            if (keys['z'] || keys['Z']) difficulty = 0;
            playerHeading = (playerHeading + 360) % 360;

            if(pause == 0){
                // Movement
                const rad = playerHeading * Math.PI / 180;
                playerX += speed * Math.sin(rad) + windX;
                playerY += speed * Math.cos(rad) + windY;

                // Fuel
                if(difficulty >= 0) {
                    fuel -= fuelRate;
                    if (fuel < 0) fuel = 0;
                    fuelEl.textContent = Math.round(fuel);
                }
            } else {
                pause -= 1;
                fuelEl.textContent = "-PAUSE-";
            }

            // Audio update
            if (audioCtx) {
                const { a, n } = getSignalStrengths();
                updateAudio(deltaMs, a, n);
                // Adjust intensities based on position
                if(difficulty <= 1) {
                    gainaEl.textContent = Math.round(a*100);
                    gainnEl.textContent = Math.round(n*100);
                } else {
                    gainaEl.textContent = "??";
                    gainnEl.textContent = "??";
                }
            }

            // Win / lose
            const dist = Math.hypot(playerX, playerY);
            if (dist < 10) {
                //alert('Success! You reached the beacon.');
                if(difficulty >= 0) resetState(difficulty + 1)
                //resetState(0)
                //initAudio()
                //return;
            }
            if (fuel <= 0) {
                alert('Out of fuel! Game over.');
                //resetState(0)
                //initAudio()
                return;
            }

            // Rendering
            ctx.clearRect(0, 0, canvas.width, canvas.height);

            // Map grid
            ctx.strokeStyle = '#333';
            for (let i = -300; i <= 300; i += 50) {
                ctx.beginPath();
                ctx.moveTo(i + 300, 0);
                ctx.lineTo(i + 300, 600);
                ctx.stroke();
                ctx.beginPath();
                ctx.moveTo(0, i + 300);
                ctx.lineTo(600, i + 300);
                ctx.stroke();
            }

            // Beacon
            ctx.fillStyle = '#ff0';
            ctx.beginPath();
            ctx.arc(300, 300, 8, 0, Math.PI * 2);
            ctx.fill();
            ctx.strokeStyle = '#ff0';
            ctx.lineWidth = 3;
            ctx.beginPath();
            ctx.moveTo(300, 300);
            ctx.lineTo(300 + 100 * Math.cos(0), 300 + 100 * Math.sin(0));
            ctx.moveTo(300, 300);
            ctx.lineTo(300 + 100 * Math.cos(Math.PI/2), 300 + 100 * Math.sin(Math.PI/2));
            ctx.moveTo(300, 300);
            ctx.lineTo(300 + 100 * Math.cos(Math.PI), 300 + 100 * Math.sin(Math.PI));
            ctx.moveTo(300, 300);
            ctx.lineTo(300 + 100 * Math.cos(3*Math.PI/2), 300 + 100 * Math.sin(3*Math.PI/2));
            ctx.stroke();

            // Player aircraft (simple triangle)
            ctx.save();
            if(difficulty <= 0) {
                // show location in tutorial only
                ctx.translate(300 - playerX, 300 - playerY);
                ctx.fillStyle = '#0ff';
            } else {
                // just show heading
                ctx.translate(300, 300);
                ctx.fillStyle = '#f0f';
                ctx.scale(3,3)
            }
            ctx.rotate((-playerHeading) * Math.PI / 180);

            ctx.beginPath();
            ctx.moveTo(0, -15);
            ctx.lineTo(-10, 10);
            ctx.lineTo(0, 5);
            ctx.lineTo(10, 10);
            ctx.closePath();
            ctx.fill();
            ctx.restore();

            // HUD
            headingEl.textContent = (360-Math.round(playerHeading)) % 360;
            if(difficulty <= 1) {
                distEl.textContent = Math.round(dist);
            } else {
                distEl.textContent = "???";
            }
            difficultyEl.textContent = difficulty

            requestAnimationFrame(gameLoop);
        }

        requestAnimationFrame(gameLoop);
    </script>
</body>
</html>