agentscript
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AgentScript Model in Model/View architecture
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<html lang="en" style="font-size:16px"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1"><link rel="icon" href="../favicon.ico"><title>Tutorial: 1 - AgentScript</title><!--[if lt IE 9]>
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AgentScript</a></div><div class="sidebar-section-children"><a href="tutorial-2 - JavaScript.html">2 - JavaScript</a></div><div class="sidebar-section-children"><a href="tutorial-3 - Browser.html">3 - Browser</a></div><div class="sidebar-section-children"><a href="tutorial-4 - Model.html">4 - Model</a></div><div class="sidebar-section-children"><a href="tutorial-5 - View.html">5 - View</a></div><div class="sidebar-section-children"><a href="tutorial-6.1 - AnimatorController.html">6.1 - AnimatorController</a></div><div class="sidebar-section-children"><a href="tutorial-6.2 - KeyboardController.html">6.2 - KeyboardController</a></div><div class="sidebar-section-children"><a href="tutorial-6.3 - GuiController.html">6.3 - GuiController</a></div><div class="sidebar-section-children"><a href="tutorial-6.4 - MouseController.html">6.4 - MouseController</a></div><div class="sidebar-section-children"><a href="tutorial-7 - CodePenServer.html">7 - CodePenServer</a></div></div></div></div></div><div class="navbar-container" id="VuAckcnZhf"><nav class="navbar"><div class="navbar-left-items"><div class="navbar-item"><a id="github" href="https://github.com/backspaces/agentscript" target="">Github</a></div><div class="navbar-item"><a id="AgentScript" href="https://code.agentscript.org" target="">AgentScript.org</a></div><div class="navbar-item"><a id="npm" href="https://www.npmjs.com/package/agentscript" target="">npm</a></div><div class="navbar-item"><a id="unpkg" href="https://unpkg.com/browse/agentscript/" target="">unpkg</a></div></div><div class="navbar-right-items"><div class="navbar-right-item"><button class="icon-button search-button" aria-label="open-search"><svg><use xlink:href="#search-icon"></use></svg></button></div><div class="navbar-right-item"><button class="icon-button theme-toggle" aria-label="toggle-theme"><svg><use class="theme-svg-use" xlink:href="#light-theme-icon"></use></svg></button></div><div class="navbar-right-item"><button class="icon-button font-size" aria-label="change-font-size"><svg><use xlink:href="#font-size-icon"></use></svg></button></div></div><nav></nav></nav></div><div class="toc-container"><div class="toc-content"><span class="bold">On this page</span><div id="eed4d2a0bfd64539bb9df78095dec881"></div></div></div><div class="body-wrapper"><div class="main-content"><div class="main-wrapper"><section><header><h2>1 - AgentScript</h2></header><article><h2 id="what-is-agentscript%3F">What is AgentScript?</h2><p>AgentScript is an open source javascript library for writing <a href="https://en.wikipedia.org/wiki/Agent-based_model">agent-based models</a>. It is inspired by the programming language <a href="https://ccl.northwestern.edu/netlogo">NetLogo</a>. It uses the <a href="https://developer.mozilla.org/en-US/docs/Glossary/MVC">Model, View, Controller</a> (MVC) architecture. It lives on Github and is publicly available on our AgentScript.org server, see <a href="https://code.agentscript.org/docs/">Home</a> above.</p><p>AgentScript creates Models inhabited by Patches, Turtles, and Links. You'll use all three in the "Snippets" example below.</p><p>All your models will have a <em>startup()</em> and <em>step()</em> function, which initializes and steps/updates your model by modifying the Patches, Turtles, and Links and their associated data.</p><h2 id="mvc">MVC</h2><p>In terms of MVC, the Model contains the data (the Patches, Turtles, and Links). The View uses this data to visualize the Model. The Controller provides the user a way to modify the running model. An example Controller would be a GUI for pause/start the model.</p><p><img src="/config/cleantheme/static/MVC.jpg" alt="Image"></p><p>Concretely, the Model very roughly follows this outline:</p><pre class="prettyprint source lang-javascript"><code>// Extend the core Model for our Model, here HelloModel
class HelloModel extends Model {
// define data to bue used by the model
constructor(..) {
// sets up the Patches (a width/height grid) and
// initializes an empty Turtles & Links array
}
setup() {
// creates the initial set of Turtles and Links
}
step() {
// Evolve the Model by Turtles and modifying data
}
}
</code></pre><p>Here it is <a href="https://code.agentscript.org/views1/hello.html">running</a> 500 steps and printing a sample of the resultant data.</p><p>Similarly, the View makes this visible like this <a href="https://code.agentscript.org/views2/hello.html">2D view</a> or this <a href="https://code.agentscript.org/views25/hello3d.html">3D view</a>, both with the same Model! This is important: once a Model is defined, it can be viewed in many different ways.</p><p>Finally, the Controllers let you interact with the Model & View. Here's an example using a <a href="https://code.agentscript.org/mvc/helloGui.html">GUI Controller</a>.</p><h2 id="examples">Examples</h2><p>AgentScript has many (over 100!) example models in several directories:</p><ul><li><a href="https://code.agentscript.org/views1">views1</a> Runs models in a HTML text view</li><li><a href="https://code.agentscript.org/views2">views2</a> Runs 2D models with x, y coordinates</li><li><a href="https://code.agentscript.org/views25">views25</a> Runs "2 and a half D" models with x, y, z coordinates</li><li><a href="https://code.agentscript.org/views3">views3</a> Runs 3D models with x, y, z coordinates, 3D shapes with tilt, pitch and roll capabilities.</li><li><a href="https://code.agentscript.org/mvc">mvc</a> Adds controllers to some of the above views.</li><li><a href="https://code.agentscript.org/leaflet">leaflet</a> and <a href="https://code.agentscript.org/maplibre">maplibre</a> GIS models using the Leaflet and MapLibre libraries.</li></ul><p>Click on the views2 directory above, you'll see:</p><p><img src="/config/cleantheme/static/Views2.jpg" alt="Image"></p><p>The left column links to the GitHub source code while the right column runs the models. They generally run 500 steps at 30 fps.</p><p>Here's what the <a href="https://code.agentscript.org/views2/linktravel.html">LinkTravel model</a> looks like:</p><p><img src="/config/cleantheme/static/LinkTravel.jpg" alt="Image"></p><p>Go on over there to see more nifty models, maybe see one you would like to understand and modify. We'll show how in our Server tutorial.</p><p>Oh, and these are shown in 2D. Here you can see <a href="https://code.agentscript.org/views25/">2.5D</a> and <a href="https://code.agentscript.org/views3/">3D</a> demos. And note the "hello" demos in each case use the same Model, but with different Views. Explore all the directories!f</p><h2 id="snippets">Snippets</h2><p>All this is a bit abstract, so we've a set of <a href="https://code.agentscript.org/config/cleantheme/Snippets.html">Snippets</a> for you to play with. It lets you see and modify Patches, Turtles, and Links, the primitives used by AgentScript. Really, go there to get a hands-on experience!</p><p>Use the browser's back button to return here.</p><p>It looks like this:</p><p><img src="/config/cleantheme/static/Snippets.jpg" alt="Image"></p><p>Finally, we've wrapped up the Snippets into a Model: <a href="https://code.agentscript.org/views2/pheromone.html">pheromone.html</a> using the Snippet's examples.</p><p><img src="/config/cleantheme/static/PheromoneView.jpg" alt="Image"></p><h2 id="don't-panic!!">Don't Panic!!</h2><p>This has been a pretty quick ride through what AgentScript can do. It can be pretty overwhelming, but don't worry, we'll dig into how you can make these models soon.</p><p>The key take-away's are:</p><ul><li>Models are made up of Patches, Turtles and Links.</li><li><a href="https://code.agentscript.org/config/cleantheme/Snippets.html">Snippets</a> let you play with these.</li><li>Models are Classes with a constructor, startup() and step() methods.</li><li>The MVC architecture is used, separating the Model, View, and Controller.</li><li>This lets the same Model be deployed in 2D, 3D, GIS and so on.</li><li>The Controllers give you an easy way to interact with the Model and View.</li></ul></article></section><footer class="footer" id="PeOAagUepe"><div class="wrapper">AgentScript version: 0.10.20 using clean-jsdoc-theme</div></footer></div></div></div><div class="search-container" id="PkfLWpAbet" style="display:none"><div class="wrapper" id="iCxFxjkHbP"><button class="icon-button search-close-button" id="VjLlGakifb" aria-label="close search"><svg><use xlink:href="#close-icon"></use></svg></button><div class="search-box-c"><svg><use xlink:href="#search-icon"></use></svg> <input type="text" id="vpcKVYIppa" class="search-input" placeholder="Search..." autofocus></div><div class="search-result-c" id="fWwVHRuDuN"><span class="search-result-c-text">Type anything to view search result</span></div></div></div><div class="mobile-menu-icon-container"><button class="icon-button" id="mobile-menu" data-isopen="false" aria-label="menu"><svg><use xlink:href="#menu-icon"></use></svg></button></div><div id="mobile-sidebar" class="mobile-sidebar-container"><div class="mobile-sidebar-wrapper"><a href="/" class="sidebar-title sidebar-title-anchor">Home</a><div class="mobile-nav-links"><div class="navbar-item"><a id="github-mobile" href="https://github.com/backspaces/agentscript" target="">Github</a></div><div class="navbar-item"><a id="AgentScript-mobile" href="https://code.agentscript.org" target="">AgentScript.org</a></div><div class="navbar-item"><a id="npm-mobile" href="https://www.npmjs.com/package/agentscript" target="">npm</a></div><div class="navbar-item"><a id="unpkg-mobile" href="https://unpkg.com/browse/agentscript/" target="">unpkg</a></div></div><div class="mobile-sidebar-items-c"><div class="sidebar-section-title with-arrow" data-isopen="false" id="sidebar-classes"><div>Classes</div><svg><use xlink:href="#down-icon"></use></svg></div><div class="sidebar-section-children-container"><div class="sidebar-section-children"><a href="AgentArray.html">AgentArray</a></div><div class="sidebar-section-children"><a href="AgentList.html">AgentList</a></div><div class="sidebar-section-children"><a href="AgentSet.html">AgentSet</a></div><div class="sidebar-section-children"><a href="Animator.html">Animator</a></div><div class="sidebar-section-children"><a href="DataSet.html">DataSet</a></div><div class="sidebar-section-children"><a href="GUI.html">GUI</a></div><div class="sidebar-section-children"><a href="GeoDataSet.html">GeoDataSet</a></div><div class="sidebar-section-children"><a href="Keyboard.html">Keyboard</a></div><div class="sidebar-section-children"><a href="Link.html">Link</a></div><div class="sidebar-section-children"><a href="Links.html">Links</a></div><div class="sidebar-section-children"><a href="Model.html">Model</a></div><div class="sidebar-section-children"><a href="Model3D.html">Model3D</a></div><div class="sidebar-section-children"><a href="Mouse.html">Mouse</a></div><div class="sidebar-section-children"><a href="Patch.html">Patch</a></div><div class="sidebar-section-children"><a href="Patches.html">Patches</a></div><div class="sidebar-section-children"><a href="RGBDataSet.html">RGBDataSet</a></div><div class="sidebar-section-children"><a href="ThreeDraw.html">ThreeDraw</a></div><div class="sidebar-section-children"><a href="Turtle.html">Turtle</a></div><div class="sidebar-section-children"><a href="Turtle3D.html">Turtle3D</a></div><div class="sidebar-section-children"><a href="Turtles.html">Turtles</a></div><div class="sidebar-section-children"><a href="TwoDraw.html">TwoDraw</a></div><div class="sidebar-section-children"><a href="World.html">World</a></div></div><div class="sidebar-section-title with-arrow" data-isopen="false" id="sidebar-modules"><div>Modules</div><svg><use xlink:href="#down-icon"></use></svg></div><div class="sidebar-section-children-container"><div class="sidebar-section-children"><a href="module-src_geojson.html">src/geojson</a></div><div class="sidebar-section-children"><a href="module-src_gis.html">src/gis</a></div><div class="sidebar-section-children"><a href="module-src_utils.html">src/utils</a></div></div><div class="sidebar-section-title with-arrow" data-isopen="false" id="sidebar-tutorials"><div>Tutorials</div><svg><use xlink:href="#down-icon"></use></svg></div><div class="sidebar-section-children-container"><div class="sidebar-section-children"><a href="tutorial-1 - AgentScript.html">1 - AgentScript</a></div><div class="sidebar-section-children"><a href="tutorial-2 - JavaScript.html">2 - JavaScript</a></div><div class="sidebar-section-children"><a href="tutorial-3 - Browser.html">3 - Browser</a></div><div class="sidebar-section-children"><a href="tutorial-4 - Model.html">4 - Model</a></div><div class="sidebar-section-children"><a href="tutorial-5 - View.html">5 - View</a></div><div class="sidebar-section-children"><a href="tutorial-6.1 - AnimatorController.html">6.1 - AnimatorController</a></div><div class="sidebar-section-children"><a href="tutorial-6.2 - KeyboardController.html">6.2 - KeyboardController</a></div><div class="sidebar-section-children"><a href="tutorial-6.3 - GuiController.html">6.3 - GuiController</a></div><div class="sidebar-section-children"><a href="tutorial-6.4 - MouseController.html">6.4 - MouseController</a></div><div class="sidebar-section-children"><a href="tutorial-7 - CodePenServer.html">7 - CodePenServer</a></div></div></div><div class="mobile-navbar-actions"><div class="navbar-right-item"><button class="icon-button search-button" aria-label="open-search"><svg><use xlink:href="#search-icon"></use></svg></button></div><div class="navbar-right-item"><button class="icon-button theme-toggle" aria-label="toggle-theme"><svg><use class="theme-svg-use" xlink:href="#light-theme-icon"></use></svg></button></div><div class="navbar-right-item"><button class="icon-button font-size" aria-label="change-font-size"><svg><use xlink:href="#font-size-icon"></use></svg></button></div></div></div></div><script type="text/javascript" src="scripts/core.min.js"></script><script src="scripts/search.min.js" defer="defer"></script><script src="scripts/third-party/fuse.js" defer="defer"></script><script type="text/javascript">var tocbotInstance=tocbot.init({tocSelector:"#eed4d2a0bfd64539bb9df78095dec881",contentSelector:".main-content",headingSelector:"h1, h2, h3",hasInnerContainers:!0,scrollContainer:".main-content",headingsOffset:130,onClick:bringLinkToView})</script></body></html>