Juego de fútbol retro: HTML5 Canvas, seguimiento de cámara

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15 May 2025

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Retro Football Guaranteed Camera Start</title>
    <style>
        body {
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            margin: 0;
            background-color: #333;
            color: white;
            font-family: 'Courier New', Courier, monospace;
            flex-direction: column;
        }
        canvas {
            background-color: #4CAF50;
            border: 2px solid white;
            cursor: default;
        }
        #ui-container {
            position: absolute;
            top: 10px;
            left: 50%;
            transform: translateX(-50%);
            display: flex;
            justify-content: space-between;
            width: 800px;
            padding: 10px;
            box-sizing: border-box;
            pointer-events: none;
        }
        .ui-item {
            background: rgba(0, 0, 0, 0.7);
            padding: 5px 10px;
            border-radius: 5px;
            pointer-events: auto;
        }
        button {
            padding: 10px;
            cursor: pointer;
            margin-left: 10px;
        }
    </style>
</head>
<body>
    <div id="ui-container">
        <div id="scoreboard" class="ui-item">Score: 0</div>
        <div id="yardage-info" class="ui-item">Down: 1 | To Go: 10 yds</div>
        <div id="action-buttons" class="ui-item" style="display: none;">
            <button onclick="handlePunt()">Punt</button>
        </div>
    </div>
    <canvas id="gameCanvas" width="800" height="400"></canvas>

const CANVAS_WIDTH = canvas.width;
        const CANVAS_HEIGHT = canvas.height;
        const FIELD_LENGTH = 1500;
        const PLAYER_SIZE = 20;
        const SPEED = 4;
        const BALL_SIZE = 8;
        const PASS_SPEED = 15;

let score = 0;
        let down = 1;
        let yardsToGo = 10;
        let lineOfScrimmageY = FIELD_LENGTH - 50;
        let gameState = 'play';

let isPassing = false;
        let passStart = { x: 0, y: 0 };
        let passEnd = { x: 0, y: 0 };

const camera = {
            x: 0,
            y: 0,
            update: function(followedObject) {
                // Centers the camera on the object's vertical center
                this.y = followedObject.y - CANVAS_HEIGHT / 2 + followedObject.height / 2;
                if (this.y < 0) this.y = 0;
                if (this.y + CANVAS_HEIGHT > FIELD_LENGTH) this.y = FIELD_LENGTH - CANVAS_HEIGHT;
            }
        };

// Function to draw a simple 8-bit sprite (5x9 pixel data)
        function drawPlayerSprite(x, y, color) {
            const size = 5;
            // The actual sprite data has been restored here:
            const spriteData = [
                0,0,1,0,0, 0,1,1,1,0, 1,1,1,1,1, 0,1,1,1,0, 0,1,1,1,0, 0,1,1,1,0, 0,1,0,1,0, 0,1,0,1,0, 1,0,0,0,1
            ];
            const pixelSize = PLAYER_SIZE / size;

ctx.fillStyle = color;
            for (let i = 0; i < spriteData.length; i++) {
                if (spriteData[i] === 1) {
                    const row = Math.floor(i / size);
                    const col = i % size;
                    ctx.fillRect(x + col * pixelSize, y + row * pixelSize, pixelSize, pixelSize);
                }
            }
        }

class Player {
            constructor(x, y, color) {
                this.x = x;
                this.y = y;
                this.color = color;
                this.width = PLAYER_SIZE;
                this.height = PLAYER_SIZE * 1.8;
                this.isQB = false;
            }
            draw() {
                drawPlayerSprite(this.x, this.y, this.color);
            }
            update(dx, dy) {
                this.x += dx;
                this.y += dy;
                if (this.x < 0) this.x = 0;
                if (this.x + this.width > CANVAS_WIDTH) this.x = CANVAS_WIDTH - this.width;
                if (this.y < 0) this.y = 0;
                if (this.y + this.height > FIELD_LENGTH) this.y = FIELD_LENGTH - this.height;
            }
        }

class Ball {
            constructor() {
                this.x = 0;
                this.y = 0;
                this.vx = 0;
                this.vy = 0;
                this.size = BALL_SIZE;
                this.color = '#FF6347';
                this.visible = false;
            }
            draw() {
                if (this.visible) {
                    ctx.fillStyle = this.color;
                    ctx.beginPath();
                    ctx.arc(this.x, this.y, this.size / 2, 0, Math.PI * 2);
                    ctx.fill();
                }
            }
            update() {
                if (this.visible) {
                    this.x += this.vx;
                    this.y += this.vy;
                }
            }
        }
        
        const qb = new Player(CANVAS_WIDTH / 2, lineOfScrimmageY, '#00BFFF');
        qb.isQB = true;
        const receiver = new Player(CANVAS_WIDTH / 4, lineOfScrimmageY - 200, '#00BFFF');
        const defender = new Player(CANVAS_WIDTH / 2 + 100, lineOfScrimmageY - 100, '#FF4500');
        const ball = new Ball();
        const players = [qb, receiver, defender];

canvas.addEventListener('mousedown', (e) => {
            const mouseX = e.offsetX;
            const mouseY = e.offsetY + camera.y;

if (mouseX >= qb.x && mouseX <= qb.x + qb.width &&
                mouseY >= qb.y && mouseY <= qb.y + qb.height &&
                gameState === 'play' && !ball.visible) {
                isPassing = true;
                passStart = { x: e.offsetX, y: e.offsetY };
                passEnd = { x: e.offsetX, y: e.offsetY };
            }
        });

canvas.addEventListener('mousemove', (e) => {
            if (isPassing) {
                passEnd = { x: e.offsetX, y: e.offsetY };
            }
        });

canvas.addEventListener('mouseup', (e) => {
            if (isPassing) {
                isPassing = false;
                const dx = passStart.x - passEnd.x;
                const dy = passStart.y - passEnd.y;
                const distance = Math.sqrt(dx * dx + dy * dy);
                
                if (distance > 10) {
                    ball.visible = true;
                    ball.x = qb.x + qb.width / 2;
                    ball.y = qb.y + qb.height / 2;
                    ball.vx = (dx / distance) * PASS_SPEED;
                    ball.vy = (dy / distance) * PASS_SPEED;
                }
            }
        });

function isColliding(obj1, obj2) {
            return obj1.x < obj2.x + obj2.width &&
                   obj1.x + obj1.width > obj2.x &&
                   obj1.y < obj2.y + obj2.height &&
                   obj1.y + obj1.height > obj2.y;
        }
        
        function handlePunt() {
            lineOfScrimmageY -= 400;
            if (lineOfScrimmageY < 50) lineOfScrimmageY = 50;
            
            qb.y = lineOfScrimmageY;
            qb.x = CANVAS_WIDTH / 2;
            defender.y = qb.y - 100;
            defender.x = CANVAS_WIDTH / 2 + 100;

down = 1;
            yardsToGo = 10;
            actionButtons.style.display = 'none';
            updateUI();
        }
        window.handlePunt = handlePunt;

function updateUI() {
            scoreboard.textContent = `Score: ${score}`;
            yardageInfo.textContent = `Down: ${down} | To Go: ${Math.floor(yardsToGo)} yds`;
        }

// Initialize the camera position before starting the loop
        camera.update(qb);

function gameLoop() {
            let dx = 0;
            let dy = 0;
            if (gameState === 'play' && !isPassing) {
                if (keys['ArrowRight']) dx = SPEED;
                if (keys['ArrowLeft']) dx = -SPEED;
                if (keys['ArrowUp']) dy = -SPEED;
                if (keys['ArrowDown']) dy = SPEED;
            }
            qb.update(dx, dy);
            
            ball.update();

if (!ball.visible) {
                 if (defender.x < qb.x) defender.x += 1;
                 if (defender.x > qb.x) defender.x -= 1;
                 if (defender.y < qb.y) defender.y += 1;
                 if (defender.y > qb.y) defender.y -= 1;
            }

if (isColliding(qb, defender)) {
                endPlay();
            }

if (ball.visible && isColliding(receiver, {x: ball.x, y: ball.y, width: ball.size, height: ball.size})) {
                ball.visible = false;
                qb.x = receiver.x;
                qb.y = receiver.y;
            }
            if (ball.visible && isColliding(defender, {x: ball.x, y: ball.y, width: ball.size, height: ball.size})) {
                ball.visible = false;
                endPlay();
            }
            if (ball.visible && (ball.x < 0 || ball.x > CANVAS_WIDTH || ball.y < 0 || ball.y > FIELD_LENGTH)) {
                ball.visible = false;
                endPlay();
            }

if (qb.y <= 0) {
                score += 6;
                alert("TOUCHDOWN!");
                lineOfScrimmageY = FIELD_LENGTH - 50;
                qb.y = lineOfScrimmageY;
                down = 1;
                yardsToGo = 10;
                updateUI();
            }

camera.update(qb);

ctx.clearRect(0, 0, CANVAS_WIDTH, CANVAS_HEIGHT);
            ctx.save();
            ctx.translate(-camera.x, -camera.y);

ctx.fillStyle = '#459748';
            ctx.fillRect(0, 0, CANVAS_WIDTH, 10);
            ctx.fillStyle = '#FFF';
            ctx.font = '10px Courier New';
            ctx.fillText('OPPONENT END ZONE', CANVAS_WIDTH / 2 - 50, 8);

ctx.strokeStyle = '#FFFFFF';
            ctx.lineWidth = 2;
            ctx.beginPath();
            ctx.moveTo(0, lineOfScrimmageY);
            ctx.lineTo(CANVAS_WIDTH, lineOfScrimmageY);
            ctx.stroke();

const firstDownY = lineOfScrimmageY - (yardsToGo * 10);
            ctx.strokeStyle = '#F00';
            ctx.beginPath();
            ctx.setLineDash();
            ctx.moveTo(0, firstDownY);
            ctx.lineTo(CANVAS_WIDTH, firstDownY);
            ctx.stroke();
            ctx.setLineDash([]);

players.forEach(player => player.draw());
            ball.draw();

if (isPassing) {
                ctx.strokeStyle = 'rgba(255, 255, 255, 0.7)';
                ctx.lineWidth = 2;
                ctx.beginPath();
                ctx.setLineDash();
                ctx.moveTo(qb.x + qb.width / 2, qb.y + qb.height / 2);
                ctx.lineTo(passEnd.x + camera.x, passEnd.y + camera.y);
                ctx.stroke();
                ctx.setLineDash([]);
            }

ctx.restore();
            requestAnimationFrame(gameLoop);
        }

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

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