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251 lines
6.5 KiB
HTML
251 lines
6.5 KiB
HTML
10 years ago
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<!--
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10 years ago
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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6 years ago
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https://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
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<title>Apache Tomcat WebSocket Examples: Multiplayer Snake</title>
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<style type="text/css">
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#playground {
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width: 640px;
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height: 480px;
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background-color: #000;
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}
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#console-container {
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float: left;
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margin-left: 15px;
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width: 300px;
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}
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#console {
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border: 1px solid #CCCCCC;
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border-right-color: #999999;
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border-bottom-color: #999999;
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height: 480px;
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overflow-y: scroll;
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padding-left: 5px;
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padding-right: 5px;
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width: 100%;
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}
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#console p {
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padding: 0;
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margin: 0;
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}
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</style>
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<script src="https://cdn.jsdelivr.net/sockjs/0.3.4/sockjs.min.js"></script>
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</head>
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<body>
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<noscript><h2 style="color: #ff0000">Seems your browser doesn't support Javascript! Websockets rely on Javascript being enabled. Please enable
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Javascript and reload this page!</h2></noscript>
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<div style="float: left">
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<canvas id="playground" width="640" height="480"></canvas>
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</div>
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<div id="console-container">
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<div id="console"></div>
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</div>
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<script type="text/javascript">
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var Game = {};
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Game.fps = 30;
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Game.socket = null;
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Game.nextFrame = null;
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Game.interval = null;
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Game.direction = 'none';
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Game.gridSize = 10;
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function Snake() {
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this.snakeBody = [];
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this.color = null;
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}
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Snake.prototype.draw = function(context) {
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for (var id in this.snakeBody) {
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context.fillStyle = this.color;
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context.fillRect(this.snakeBody[id].x, this.snakeBody[id].y, Game.gridSize, Game.gridSize);
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}
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};
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Game.initialize = function() {
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this.entities = [];
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canvas = document.getElementById('playground');
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if (!canvas.getContext) {
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Console.log('Error: 2d canvas not supported by this browser.');
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return;
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}
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this.context = canvas.getContext('2d');
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window.addEventListener('keydown', function (e) {
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var code = e.keyCode;
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if (code > 36 && code < 41) {
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switch (code) {
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case 37:
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if (Game.direction != 'east') Game.setDirection('west');
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break;
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case 38:
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if (Game.direction != 'south') Game.setDirection('north');
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break;
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case 39:
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if (Game.direction != 'west') Game.setDirection('east');
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break;
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case 40:
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if (Game.direction != 'north') Game.setDirection('south');
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break;
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}
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}
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}, false);
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Game.connect();
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};
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Game.setDirection = function(direction) {
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Game.direction = direction;
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Game.socket.send(direction);
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Console.log('Sent: Direction ' + direction);
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};
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Game.startGameLoop = function() {
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if (window.webkitRequestAnimationFrame) {
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Game.nextFrame = function () {
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webkitRequestAnimationFrame(Game.run);
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};
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} else if (window.mozRequestAnimationFrame) {
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Game.nextFrame = function () {
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mozRequestAnimationFrame(Game.run);
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};
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} else {
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Game.interval = setInterval(Game.run, 1000 / Game.fps);
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}
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if (Game.nextFrame != null) {
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Game.nextFrame();
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}
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};
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Game.stopGameLoop = function () {
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Game.nextFrame = null;
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if (Game.interval != null) {
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clearInterval(Game.interval);
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}
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};
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Game.draw = function() {
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this.context.clearRect(0, 0, 640, 480);
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for (var id in this.entities) {
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this.entities[id].draw(this.context);
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}
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};
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Game.addSnake = function(id, color) {
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Game.entities[id] = new Snake();
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Game.entities[id].color = color;
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};
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Game.updateSnake = function(id, snakeBody) {
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if (typeof Game.entities[id] != "undefined") {
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Game.entities[id].snakeBody = snakeBody;
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}
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};
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Game.removeSnake = function(id) {
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Game.entities[id] = null;
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// Force GC.
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delete Game.entities[id];
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};
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Game.run = (function() {
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var skipTicks = 1000 / Game.fps, nextGameTick = (new Date).getTime();
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return function() {
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while ((new Date).getTime() > nextGameTick) {
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nextGameTick += skipTicks;
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}
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Game.draw();
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if (Game.nextFrame != null) {
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Game.nextFrame();
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}
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};
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})();
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Game.connect = (function() {
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Game.socket = new SockJS("/snake");
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Game.socket.onopen = function () {
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// Socket open.. start the game loop.
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Console.log('Info: WebSocket connection opened.');
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Console.log('Info: Press an arrow key to begin.');
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Game.startGameLoop();
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setInterval(function() {
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// Prevent server read timeout.
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Game.socket.send('ping');
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}, 5000);
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};
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Game.socket.onclose = function () {
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Console.log('Info: WebSocket closed.');
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Game.stopGameLoop();
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};
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Game.socket.onmessage = function (message) {
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// _Potential_ security hole, consider using json lib to parse data in production.
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var packet = eval('(' + message.data + ')');
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switch (packet.type) {
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case 'update':
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for (var i = 0; i < packet.data.length; i++) {
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Game.updateSnake(packet.data[i].id, packet.data[i].body);
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}
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break;
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case 'join':
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for (var j = 0; j < packet.data.length; j++) {
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Game.addSnake(packet.data[j].id, packet.data[j].color);
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}
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break;
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case 'leave':
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Game.removeSnake(packet.id);
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break;
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case 'dead':
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Console.log('Info: Your snake is dead, bad luck!');
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Game.direction = 'none';
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break;
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case 'kill':
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Console.log('Info: Head shot!');
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break;
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}
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};
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});
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var Console = {};
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Console.log = (function(message) {
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var console = document.getElementById('console');
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var p = document.createElement('p');
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p.style.wordWrap = 'break-word';
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p.innerHTML = message;
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console.appendChild(p);
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while (console.childNodes.length > 25) {
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console.removeChild(console.firstChild);
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}
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console.scrollTop = console.scrollHeight;
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});
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Game.initialize();
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</script>
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10 years ago
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</body>
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</html>
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