agentscript
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AgentScript Model in Model/View architecture
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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>4 - Model</h2></header><article><!-- # Model --><p>We saw Snippets of Patches, Turtles and Links. Now we want to use those to create our first Model, our Hello World model.</p><p>There will be three parts:</p><ul><li>Creating the HelloModel.js, and</li><li>Creating the hello.html file which uses HelloModel.js and</li><li>Using a browser to run hello.html</li></ul><h2 id="model">Model</h2><p>Our HelloModel.js is simple, yet uses all the elements of more complex models.</p><p>Lets look at <a href="https://code.agentscript.org/models/HelloModel.js">HelloModel.js</a></p><pre class="prettyprint source lang-javascript"><code>import Model from 'https://code.agentscript.org/src/Model.js'
import * as util from 'https://code.agentscript.org/src/utils.js'
class HelloModel extends Model {
population = 10 // number of turtles
speed = 0.1 // step size in patch units
wiggleAngle = 10 // wiggle angle in degrees
linksToo = true // handy to show just turtles if false
// default worldOptions: 33 x 33 patches with 0,0 origin at the center.
constructor(worldOptions = undefined) {
super(worldOptions)
}
setup() {
// Have turtles "bounce" at the Patches edges. Default is to wrap
this.turtles.setDefault('atEdge', 'bounce')
// create "population" turtles placed on random patches
this.turtles.create(this.population, t => {
const patch = this.patches.oneOf()
t.setxy(patch.x, patch.y)
})
// If links.too is true, create a link from every turtle to another turtle
if (this.linksToo) {
this.turtles.ask(t => {
this.links.create(t, this.turtles.otherOneOf(t))
})
}
}
step() {
// change heading randomly, moving forward by "speed"
this.turtles.ask(t => {
t.heading += util.randomCentered(this.wiggleAngle)
t.forward(this.speed)
})
}
}
export default HelloModel
</code></pre><p>We first import two modules from our src/ folder</p><ul><li>Model.js: This is used by all models and creates the Patches, Turtles and Links.</li><li>utils.js: A collection of useful utility functions. We'll use util.randomCentered</li></ul><p>Then we create a <a href="https://javascript.info/class">Class</a> which <a href="https://javascript.info/class-inheritance">inherits</a> from the Model.js import (which manages the Patches, Turtles, Links). All Models start out inheriting from Model.js.</p><p>The class has 4 variables, a constructor, and two methods.</p><ul><li>The constructor just calls the Model.js super class using the default "world".<ul><li>The default world is 33 x 33 patches with 0,0 origin at the center.</li></ul></li><li>The 4 variables are used in the 2 methods to create the model's behavior</li><li>setup:<ul><li>creates "population" turtles</li><li>If links.too is true, create a link from every turtle to another turtle</li></ul></li><li>step:<ul><li>use "wiggleAngle" to ask each turtle to turn randomly from -(wiggleAngle/2) to +(wiggleAngle/2)</li><li>use "speed" to move each turtle forward by speed patches</li></ul></li><li>Finally we export HelloModel to be used elsewhere. For example, in the HTML below.</li></ul><h2 id="html">HTML</h2><p>The HTML used by the browser is quite simple. It provides a title, and a script which imports the HelloModel.js above, calls model.step 500 times, and it prints a start message and a random sample of the model's data.</p><pre class="prettyprint source lang-html"><code><html>
<head>
<title>Hello</title>
</head>
<body>
<script type="module">
import * as util from 'https://code.agentscript.org/src/utils.js'
import Model from 'https://code.agentscript.org/models/HelloModel.js'
util.printToPage('Running for 500 steps.')
const model = new Model()
await model.startup()
model.setup()
util.repeat(500, model.step)
const sample = util.sampleModel(model)
util.printToPage(sample)
</script>
</body>
</html>
</code></pre><p>You can run it <a href="https://code.agentscript.org/views1/hello.html">here</a>. Click the browser's reload button to get a new random sampling. They look like:</p><p><img src="/config/cleantheme/static/RandomSample.jpg" alt="Image"></p><p>But wait! Where's the pretty View? This is just text!</p><p>Well, it is MVC, and we haven't discussed Views yet. That's next.</p></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>