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class Car {
 constructor(x, y, color) {
    this.x = x;
    this.y = y;
    this.color = color;
    this.speed = 0;
    this.maxSpeed = 10;
    this.friction = 0.99;
    this.acceleration = 1;
    this.turningSpeed = 0.05;
 }

 move(steering, dt) {
    // calculate speed change due to acceleration
    let accelerationSpeedChange = this.acceleration * steering * dt;

    // apply speed change, clamping at max speed
    this.speed = Math.min(this.speed + accelerationSpeedChange, this.maxSpeed);

    // calculate distance traveled
    let distance = this.speed * dt;

    // calculate speed reduction due to friction
    this.speed *= this.friction;

    // return the distance traveled
    return distance;
 }

 draw(ctx) {
    ctx.save();
    ctx.translate(this.x, this.y);
    ctx.rotate(this.speed / this.maxSpeed * this.turningSpeed);
    ctx.fillStyle = this.color;
    ctx.fillRect(-50, -10, 100, 20);
    ctx.restore();
 }
}

class Game {
 constructor(canvas) {
    this.canvas = canvas;
    this.ctx = canvas.getContext('2d');
    this.cars = [];
    this.car = new Car(canvas.width / 2, canvas.height / 2, 'red');
    this.cars.push(this.car);
    this.time = 0;
 }

 step(dt) {
    this.time += dt;
    this.car.move(Math.sin(this.time), dt);

    this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height);

    for (let car of this.cars) {
      car.draw(this.ctx);
    }

    requestAnimationFrame(this.step.bind(this));
 }
}

let canvas = document.getElementById('canvas');
let game = new Game(canvas);
game.step(16);
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