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GameEngine.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
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<title>GameEngine - Documentation</title>
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<h2 class="home"><a href="index.html">Lance</a></h2><h2>Concepts</h2><ul class="tutorials"><li><span class='category'>Introduction<ul><li><a href="tutorial-introduction.html">Introduction</a></li><li><a href="tutorial-introduction_prologue.html">Prologue</a></li><li><a href="tutorial-introduction_community.html">Community</a></li><li><a href="tutorial-introduction_roadmap.html">Development Roadmap</a></li><li><a href="tutorial-introduction_faq.html">Frequently Asked Questions</a></li></ul></li><li><span class='category'>Overview<ul><li><a href="tutorial-overview_architecture.html">Architecture of a Multiplayer Game</a></li><li><a href="tutorial-choosing_a_physics_engine.html">Choosing a Physics Engine</a></li><li><a href="tutorial-guide_gameengine.html">Game Engine</a></li><li><a href="tutorial-guide_serverengine.html">Server Engine</a></li><li><a href="tutorial-guide_clientengine.html">Client Engine</a></li><li><a href="tutorial-guide_renderer.html">Renderer</a></li><li><a href="tutorial-guide_gameworld.html">Game World and Game Objects</a></li><li><a href="tutorial-guide_serialization.html">Serialization and Communication</a></li></ul></li><li><span class='category'>Synchronization Methods<ul><li><a href="tutorial-guide_syncinterpolation.html">Interpolation</a></li><li><a href="tutorial-guide_syncextrapolation.html">Extrapolation</a></li></ul></li><li><span class='category'>Tutorials<ul><li><a href="tutorial-MyFirstGame.html">My First Game: Pong</a></li><li><a href="tutorial-spaceships.html">Spaaace</a></li></ul></li><li><span class='category'>Extras<ul><li><a href="tutorial-guide_tuningdebugging.html">Fine Tuning and Debugging</a></li><li><a href="tutorial-furtherreading.html">Further Reading</a></li></ul></li></ul><h2>API Reference</h2><h3 class="classes">Classes</h3><ul><li><a href="AFrameRenderer.html">AFrameRenderer</a><ul class='methods'><li data-type='method'><a href="AFrameRenderer.html#draw">draw</a></li><li data-type='method'><a href="AFrameRenderer.html#init">init</a></li></ul></li><li><a href="BaseTypes.html">BaseTypes</a></li><li><a href="CannonPhysicsEngine.html">CannonPhysicsEngine</a></li><li><a href="ClientEngine.html">ClientEngine</a><ul class='methods'><li data-type='method'><a href="ClientEngine.html#connect">connect</a></li><li data-type='method'><a href="ClientEngine.html#disconnect">disconnect</a></li><li data-type='method'><a href="ClientEngine.html#sendInput">sendInput</a></li><li data-type='method'><a href="ClientEngine.html#start">start</a></li></ul></li><li><a href="DynamicObject.html">DynamicObject</a><ul class='methods'><li data-type='method'><a href="DynamicObject.html#bendingToString">bendingToString</a></li><li data-type='method'><a href="DynamicObject.html#toString">toString</a></li></ul></li><li><a href="GameEngine.html">GameEngine</a><ul class='methods'><li data-type='method'><a href="GameEngine.html#addObjectToWorld">addObjectToWorld</a></li><li data-type='method'><a href="GameEngine.html#getPlayerGameOverResult">getPlayerGameOverResult</a></li><li data-type='method'><a href="GameEngine.html#isOwnedByPlayer">isOwnedByPlayer</a></li><li data-type='method'><a href="GameEngine.html#on">on</a></li><li data-type='method'><a href="GameEngine.html#once">once</a></li><li data-type='method'><a href="GameEngine.html#processInput">processInput</a></li><li data-type='method'><a href="GameEngine.html#registerClasses">registerClasses</a></li><li data-type='method'><a href="GameEngine.html#removeListener">removeListener</a></li><li data-type='method'><a href="GameEngine.html#removeObjectFromWorld">removeObjectFromWorld</a></li><li data-type='method'><a href="GameEngine.html#start">start</a></li><li data-type='method'><a href="GameEngine.html#step">step</a></li></ul></li><li><a href="GameObject.html">GameObject</a><ul class='methods'><li data-type='method'><a href="GameObject.html#bendingToString">bendingToString</a></li><li data-type='method'><a href="GameObject.html#hasComponent">hasComponent</a></li><li data-type='method'><a href="GameObject.html#onAddToWorld">onAddToWorld</a></li><li data-type='method'><a href="GameObject.html#onRemoveFromWorld">onRemoveFromWorld</a></li><li data-type='method'><a href="GameObject.html#syncTo">syncTo</a></li><li data-type='method'><a href="GameObject.html#toString">toString</a></li></ul></li><li><a href="GameWorld.html">GameWorld</a><ul class='methods'><li data-type='method'><a href="GameWorld.html#addObject">addObject</a></li><li data-type='method'><a href="GameWorld.html#forEachObject">forEachObject</a></li><li data-type='method'><a href="GameWorld.html#getNewId">getNewId</a></li><li data-type='method'><a href="GameWorld.html#queryObject">queryObject</a></li><li data-type='method'><a href="GameWorld.html#queryObjects">queryObjects</a></li><li data-type='method'><a href="GameWorld.html#removeObject">removeObject</a></li></ul></li><li><a href="KeyboardControls.html">KeyboardControls</a></li><li><a href="PhysicalObject2D.html">PhysicalObject2D</a><ul class='methods'><li data-type='method'><a href="PhysicalObject2D.html#onAddToWorld">onAddToWorld</a></li><li data-type='method'><a href="PhysicalObject2D.html#toString">toString</a></li></ul></li><li><a href="PhysicalObject3D.html">PhysicalObject3D</a><ul class='methods'><li data-type='method'><a href="PhysicalObject3D.html#toString">toString</a></li></ul></li><li><a href="Quaternion.html">Quaternion</a><ul class='methods'><li data-type='method'><a href="Quaternion.html#conjugate">conjugate</a></li><li data-type='method'><a href="Quaternion.html#copy">copy</a></li><li data-type='method'><a href="Quaternion.html#multiply">multiply</a></li><li data-type='method'><a href="Quaternion.html#set">set</a></li><li data-type='method'><a href="Quaternion.html#setFromAxisAngle">setFromAxisAngle</a></li><li data-type='method'><a href="Quaternion.html#slerp">slerp</a></li><li data-type='method'><a href="Quaternion.html#toAxisAngle">toAxisAngle</a></li><li data-type='method'><a href="Quaternion.html#toString">toString</a></li></ul></li><li><a href="Renderer.html">Renderer</a><ul class='methods'><li data-type='method'><a href="Renderer.html#addObject">addObject</a></li><li data-type='method'><a href="Renderer.html#draw">draw</a></li><li data-type='method'><a href="Renderer.html#init">init</a></li><li data-type='method'><a href="Renderer.html#removeObject">removeObject</a></li><li data-type='method'><a href="Renderer.html#runClientStep">runClientStep</a></li><li data-type='method'><a href="Renderer.html#stop">stop</a></li></ul></li><li><a href="Serializer.html">Serializer</a><ul class='methods'><li data-type='method'><a href="Serializer.html#.typeCanAssign">typeCanAssign</a></li><li data-type='method'><a href="Serializer.html#addCustomType">addCustomType</a></li><li data-type='method'><a href="Serializer.html#registerClass">registerClass</a></li></ul></li><li><a href="ServerEngine.html">ServerEngine</a><ul class='methods'><li data-type='method'><a href="ServerEngine.html#gameStatus">gameStatus</a></li></ul></li><li><a href="SimplePhysicsEngine.html">SimplePhysicsEngine</a></li><li><a href="ThreeVector.html">ThreeVector</a><ul class='methods'><li data-type='method'><a href="ThreeVector.html#add">add</a></li><li data-type='method'><a href="ThreeVector.html#clone">clone</a></li><li data-type='method'><a href="ThreeVector.html#copy">copy</a></li><li data-type='method'><a href="ThreeVector.html#getBendingDelta">getBendingDelta</a></li><li data-type='method'><a href="ThreeVector.html#length">length</a></li><li data-type='method'><a href="ThreeVector.html#lerp">lerp</a></li><li data-type='method'><a href="ThreeVector.html#multiplyScalar">multiplyScalar</a></li><li data-type='method'><a href="ThreeVector.html#normalize">normalize</a></li><li data-type='method'><a href="ThreeVector.html#set">set</a></li><li data-type='method'><a href="ThreeVector.html#subtract">subtract</a></li><li data-type='method'><a href="ThreeVector.html#toString">toString</a></li></ul></li><li><a href="Trace.html">Trace</a></li><li><a href="TwoVector.html">TwoVector</a><ul class='methods'><li data-type='method'><a href="TwoVector.html#add">add</a></li><li data-type='method'><a href="TwoVector.html#clone">clone</a></li><li data-type='method'><a href="TwoVector.html#copy">copy</a></li><li data-type='method'><a href="TwoVector.html#getBendingDelta">getBendingDelta</a></li><li data-type='method'><a href="TwoVector.html#length">length</a></li><li data-type='method'><a href="TwoVector.html#lerp">lerp</a></li><li data-type='method'><a href="TwoVector.html#multiplyScalar">multiplyScalar</a></li><li data-type='method'><a href="TwoVector.html#normalize">normalize</a></li><li data-type='method'><a href="TwoVector.html#set">set</a></li><li data-type='method'><a href="TwoVector.html#subtract">subtract</a></li><li data-type='method'><a href="TwoVector.html#toString">toString</a></li></ul></li></ul><h3 class="events">Events</h3><ul><li><a href="GameEngine.html#event:client__postStep">client__postStep</a></li><li><a href="GameEngine.html#event:client__preStep">client__preStep</a></li><li><a href="GameEngine.html#event:client__processInput">client__processInput</a></li><li><a href="GameEngine.html#event:client__slowFrameRate">client__slowFrameRate</a></li><li><a href="GameEngine.html#event:client__stepReset">client__stepReset</a></li><li><a href="GameEngine.html#event:client__syncReceived">client__syncReceived</a></li><li><a href="GameEngine.html#event:objectAdded">objectAdded</a></li><li><a href="GameEngine.html#event:objectDestroyed">objectDestroyed</a></li><li><a href="GameEngine.html#event:playerDisconnected">playerDisconnected</a></li><li><a href="GameEngine.html#event:playerJoined">playerJoined</a></li><li><a href="GameEngine.html#event:postStep">postStep</a></li><li><a href="GameEngine.html#event:preStep">preStep</a></li><li><a href="GameEngine.html#event:processInput">processInput</a></li><li><a href="GameEngine.html#event:server__inputReceived">server__inputReceived</a></li><li><a href="GameEngine.html#event:server__playerDisconnected">server__playerDisconnected</a></li><li><a href="GameEngine.html#event:server__playerJoined">server__playerJoined</a></li><li><a href="GameEngine.html#event:server__postStep">server__postStep</a></li><li><a href="GameEngine.html#event:server__preStep">server__preStep</a></li><li><a href="GameEngine.html#event:server__processInput">server__processInput</a></li><li><a href="GameEngine.html#event:start">start</a></li><li><a href="GameEngine.html#event:syncReceived">syncReceived</a></li></ul>
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<div id="main">
<h1 class="page-title">GameEngine</h1>
<section>
<header class="package">
<h2>
GameEngine
</h2>
<div class="class-description"><p>The GameEngine contains the game logic. Extend this class
to implement game mechanics. The GameEngine derived
instance runs once on the server, where the final decisions
are always taken, and one instance will run on each client as well,
where the client emulates what it expects to be happening
on the server.</p>
<p>The game engine's logic must listen to user inputs and
act on these inputs to change the game state. For example,
the game engine listens to controller/keyboard inputs to infer
movement for the player/ship/first-person. The game engine listens
to clicks, button-presses to infer firing, etc..</p>
<p>Note that the game engine runs on both the server and on the
clients - but the server decisions always have the final say,
and therefore clients must resolve server updates which conflict
with client-side predictions.</p></div>
</header>
<article class="package">
<div class="container-overview">
<h2>Constructor</h2>
<h4 class="name" id="GameEngine"><span class="type-signature"></span>new GameEngine<span class="signature">(options)</span><span class="type-signature"></span></h4>
<div class="description">
<p>Create a game engine instance. This needs to happen
once on the server, and once on each client.</p>
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>options</code></td>
<td class="type">
<span class="param-type">Object</span>
</td>
<td class="description last"><p>options object</p>
<h6>Properties</h6>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>traceLevel</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last"><p>the trace level from 0 to 5. Lower value traces more.</p></td>
</tr>
<tr>
<td class="name"><code>delayInputCount</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last"><p>client side only. Introduce an artificial delay on the client to better match the time it will occur on the server. This value sets the number of steps the client will wait before applying the input locally</p></td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="GameEngine.js.html">GameEngine.js</a>, <a href="GameEngine.js.html#line25">line 25</a>
</li></ul></dd>
</dl>
</div>
<h3 class="subsection-title">Members</h3>
<h4 class="name" id=".worldSettings"><span class="type-signature">(static) </span>worldSettings<span class="type-signature"> :Object</span></h4>
<div class="description">
<p>The worldSettings defines the game world constants, such
as width, height, depth, etc. such that all other classes
can reference these values.</p>
</div>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="GameEngine.js.html">GameEngine.js</a>, <a href="GameEngine.js.html#line117">line 117</a>
</li></ul></dd>
</dl>
<h4 class="name" id="playerId"><span class="type-signature"></span>playerId<span class="type-signature"> :String</span></h4>
<div class="description">
<p>client's player ID, as a string. If running on the client, this is set at runtime by the clientEngine</p>
</div>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="GameEngine.js.html">GameEngine.js</a>, <a href="GameEngine.js.html#line52">line 52</a>
</li></ul></dd>
</dl>
<h3 class="subsection-title">Methods</h3>
<h4 class="name" id="addObjectToWorld"><span class="type-signature"></span>addObjectToWorld<span class="signature">(object)</span><span class="type-signature"> → {Object}</span></h4>
<div class="description">
<p>Add object to the game world.
On the client side, the object may not be created, if the server copy
of this object is already in the game world. This could happen when the client
is using delayed-input, and the RTT is very low.</p>
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>object</code></td>
<td class="type">
<span class="param-type">Object</span>
</td>
<td class="description last"><p>the object.</p></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="GameEngine.js.html">GameEngine.js</a>, <a href="GameEngine.js.html#line205">line 205</a>
</li></ul></dd>
</dl>
<h5>Returns:</h5>
<div class="param-desc">
<p>object - the final object.</p>
</div>
<dl class="param-type">
<dt>
Type
</dt>
<dd>
<span class="param-type">Object</span>
</dd>
</dl>
<h4 class="name" id="getPlayerGameOverResult"><span class="type-signature"></span>getPlayerGameOverResult<span class="signature">()</span><span class="type-signature"> → {Object}</span></h4>
<div class="description">
<p>Decide whether the player game is over by returning an Object, need to be implemented</p>
</div>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="GameEngine.js.html">GameEngine.js</a>, <a href="GameEngine.js.html#line309">line 309</a>
</li></ul></dd>
</dl>
<h5>Returns:</h5>
<div class="param-desc">
<p>truthful if the game is over for the player and the object is returned as GameOver data</p>
</div>
<dl class="param-type">
<dt>
Type
</dt>
<dd>
<span class="param-type">Object</span>
</dd>
</dl>
<h4 class="name" id="isOwnedByPlayer"><span class="type-signature"></span>isOwnedByPlayer<span class="signature">(object)</span><span class="type-signature"> → {Boolean}</span></h4>
<div class="description">
<p>Check if a given object is owned by the player on this client</p>
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>object</code></td>
<td class="type">
<span class="param-type">Object</span>
</td>
<td class="description last"><p>the game object to check</p></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="GameEngine.js.html">GameEngine.js</a>, <a href="GameEngine.js.html#line286">line 286</a>
</li></ul></dd>
</dl>
<h5>Returns:</h5>
<div class="param-desc">
<p>true if the game object is owned by the player on this client</p>
</div>
<dl class="param-type">
<dt>
Type
</dt>
<dd>
<span class="param-type">Boolean</span>
</dd>
</dl>
<h4 class="name" id="on"><span class="type-signature"></span>on<span class="signature">(eventName, eventHandler)</span><span class="type-signature"></span></h4>
<div class="description">
<p>Register a handler for an event</p>
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>eventName</code></td>
<td class="type">
<span class="param-type">String</span>
</td>
<td class="description last"><p>name of the event</p></td>
</tr>
<tr>
<td class="name"><code>eventHandler</code></td>
<td class="type">
<span class="param-type">function</span>
</td>
<td class="description last"><p>handler function</p></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="GameEngine.js.html">GameEngine.js</a>, <a href="GameEngine.js.html#line57">line 57</a>
</li></ul></dd>
</dl>
<h4 class="name" id="once"><span class="type-signature"></span>once<span class="signature">(eventName, eventHandler)</span><span class="type-signature"></span></h4>