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- var animate = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || function (callback) {
- window.setTimeout(callback, 1000 / 60)
- };
- var canvas = document.createElement("canvas");
- var width = 400;
- var height = 600;
- canvas.width = width;
- canvas.height = height;
- var context = canvas.getContext('2d');
- var player = new Player();
- var computer = new Computer();
- var ball = new Ball(200, 300);
- var keysDown = {};
- var render = function () {
- context.fillStyle = "#FF00FF";
- context.fillRect(0, 0, width, height);
- player.render();
- computer.render();
- ball.render();
- };
- var update = function () {
- player.update();
- computer.update(ball);
- ball.update(player.paddle, computer.paddle);
- };
- var step = function () {
- update();
- render();
- animate(step);
- };
- function Paddle(x, y, width, height) {
- this.x = x;
- this.y = y;
- this.width = width;
- this.height = height;
- this.x_speed = 0;
- this.y_speed = 0;
- }
- Paddle.prototype.render = function () {
- context.fillStyle = "#0000FF";
- context.fillRect(this.x, this.y, this.width, this.height);
- };
- Paddle.prototype.move = function (x, y) {
- this.x += x;
- this.y += y;
- this.x_speed = x;
- this.y_speed = y;
- if (this.x < 0) {
- this.x = 0;
- this.x_speed = 0;
- } else if (this.x + this.width > 400) {
- this.x = 400 - this.width;
- this.x_speed = 0;
- }
- };
- function Computer() {
- this.paddle = new Paddle(175, 10, 50, 10);
- }
- Computer.prototype.render = function () {
- this.paddle.render();
- };
- Computer.prototype.update = function (ball) {
- var x_pos = ball.x;
- var diff = -((this.paddle.x + (this.paddle.width / 2)) - x_pos);
- if (diff < 0 && diff < -4) {
- diff = -5;
- } else if (diff > 0 && diff > 4) {
- diff = 5;
- }
- this.paddle.move(diff, 0);
- if (this.paddle.x < 0) {
- this.paddle.x = 0;
- } else if (this.paddle.x + this.paddle.width > 400) {
- this.paddle.x = 400 - this.paddle.width;
- }
- };
- function Player() {
- this.paddle = new Paddle(175, 580, 50, 10);
- }
- Player.prototype.render = function () {
- this.paddle.render();
- };
- Player.prototype.update = function () {
- for (var key in keysDown) {
- var value = Number(key);
- if (value == 37) {
- this.paddle.move(-4, 0);
- } else if (value == 39) {
- this.paddle.move(4, 0);
- } else {
- this.paddle.move(0, 0);
- }
- }
- };
- function Ball(x, y) {
- this.x = x;
- this.y = y;
- this.x_speed = 0;
- this.y_speed = 3;
- }
- Ball.prototype.render = function () {
- context.beginPath();
- context.arc(this.x, this.y, 5, 2 * Math.PI, false);
- context.fillStyle = "#000000";
- context.fill();
- };
- Ball.prototype.update = function (paddle1, paddle2) {
- this.x += this.x_speed;
- this.y += this.y_speed;
- var top_x = this.x - 5;
- var top_y = this.y - 5;
- var bottom_x = this.x + 5;
- var bottom_y = this.y + 5;
- if (this.x - 5 < 0) {
- this.x = 5;
- this.x_speed = -this.x_speed;
- } else if (this.x + 5 > 400) {
- this.x = 395;
- this.x_speed = -this.x_speed;
- }
- if (this.y < 0 || this.y > 600) {
- this.x_speed = 0;
- this.y_speed = 3;
- this.x = 200;
- this.y = 300;
- }
- if (top_y > 300) {
- if (top_y < (paddle1.y + paddle1.height) && bottom_y > paddle1.y && top_x < (paddle1.x + paddle1.width) && bottom_x > paddle1.x) {
- this.y_speed = -3;
- this.x_speed += (paddle1.x_speed / 2);
- this.y += this.y_speed;
- }
- } else {
- if (top_y < (paddle2.y + paddle2.height) && bottom_y > paddle2.y && top_x < (paddle2.x + paddle2.width) && bottom_x > paddle2.x) {
- this.y_speed = 3;
- this.x_speed += (paddle2.x_speed / 2);
- this.y += this.y_speed;
- }
- }
- };
- document.body.appendChild(canvas);
- animate(step);
- window.addEventListener("keydown", function (event) {
- keysDown[event.keyCode] = true;
- });
- window.addEventListener("keyup", function (event) {
- delete keysDown[event.keyCode];
- });
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