illectro.github.io/prox_ops.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>Proximity Operations</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="info">Position: <span id="playerX">0</span>,<span id="playerY">0</span> | Velocity: <span id="playerVX">0</span>,<span id="playerVY">0</span> </div>
    <canvas id="canvas" width="1280" height="720"></canvas>
    <div id="instructions">
        <p><strong>Controls:</strong> A = turn left | D = turn right | W = Thrust</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 pxEl = document.getElementById('playerX');
        const pyEl = document.getElementById('playerY');
        const pvxEl = document.getElementById('playerVX');
        const pvyEl = document.getElementById('playerVY');
        const positions = []


        // Game parameters
        let n_param = 0.002;
        let playerX = 500;          // Player position relative to beacon (beacon at 0,0)
        let playerY = -50;       // Start south of beacon
        let playerVX = 1.5*n_param*playerY;
        let playerVY = 0;
        let playerHeading = 40;  // Degrees, 0 = north, 90 = east, etc.
        let turnRate = 5;         // Degrees per frame when turning
        let thrust = 0.01;            // Units per frame
        let fuel = 100;
        let fuelRate = 0.1;      // % per frame while firing
        let difficulty = 0;
        let pause = 100;

        let timer = 0;


        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 = -20;       // 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
                }
            }
            fuel = 100;
            pause = 100;
        }

        // Controls
        const keys = {};
        window.addEventListener('keydown', e => { keys[e.key] = true; });
        window.addEventListener('keyup', e => { keys[e.key] = false; });

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

            lastUpdate = timestamp;
            let accel = 0

            // Input
            if (keys['ArrowLeft'] || keys['a'] || keys['A']) playerHeading += turnRate;
            if (keys['ArrowRight'] || keys['d'] || keys['D']) playerHeading -= turnRate;
            if (keys['ArrowUp']  || keys['w'] || keys['W']) accel = thrust;


            // 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 Note that X & Y are swapped from CW equations
                playerVX += 2*n_param*playerVY
                playerVY += 3*n_param*n_param * playerY - 2*n_param*playerVX

                playerX += playerVX
                playerY += playerVY

                if (accel > 0) {
                    const rad = playerHeading * Math.PI / 180;
                    playerVX += accel * Math.sin(rad) ;
                    playerVY += accel * Math.cos(rad) ;
                }

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

            // Win / lose
            const dist = Math.hypot(playerX, playerY);
            if (dist < 10) {
                timer += deltaMs
                if (timer > 10000) {
                    alert('Success! You reached the beacon.');
                    return;
                }
                //if(difficulty >= 0) resetState(difficulty + 1)
            } else {
                timer = 0
            }
            if (fuel <= 0) {
                alert('Out of fuel! Game over.');
                return;
            }
            // update trail
            if(phase > 2000) {
                phase -= 2000;
                positions.push([ playerX, playerY ]);
                if(positions.length > 50) {
                    positions.shift()
                }
            }

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

            // Map grid
            let cx = canvas.width/2
            let cy = canvas.height/2

            ctx.strokeStyle = '#333';
            for (let i = -cx; i <= cx; i += 100) {
                ctx.beginPath();
                ctx.moveTo(i + cx, 0);
                ctx.lineTo(i + cx, canvas.height);
                ctx.stroke();
            }
            for (let i = -cy; i < cy ; i += 100) {

                ctx.beginPath();
                ctx.moveTo(0, i + cy);
                ctx.lineTo(canvas.width, i + cy);
                ctx.stroke();
            }

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

            for (let i = 0; i < positions.length; i++) {
                const pos = positions[i];

                // Calculate a radius that fades out (optional, creates a tapered end)
                const radius = (i / positions.length) * 5;

                ctx.beginPath();
                ctx.arc(cx - pos[0], cy - pos[1], radius, 0, Math.PI * 2, false);
                ctx.fillStyle = '#dd2222'; // Black dots
                ctx.fill();
            }

            // Player spacecraft (simple triangle)
            ctx.save();
            ctx.translate(cx - playerX, cy - playerY);
            ctx.fillStyle = '#0ff';
            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;
            distEl.textContent = Math.round(dist);
            pxEl.textContent = Math.round(-playerX);
            pyEl.textContent = Math.round(playerY);
            pvxEl.textContent = Math.round(-playerVX*100);
            pvyEl.textContent = Math.round(playerVY*100);

            requestAnimationFrame(gameLoop);
        }

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