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class="sswrap "> <a class="ss" href="#section-1">§</a> </div> <h1 id="demo-particles-008">Demo Particles 008</h1> <p>Net entity: generation and basic functionality, including Spring objects</p> </div> </li> <li id="section-2"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-2">§</a> </div> <p><a href="../../demo/particles-008.html">Run code</a></p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">import</span> * <span class="hljs-keyword">as</span> scrawl <span class="hljs-keyword">from</span> <span class="hljs-string">'../source/scrawl.js'</span>; <span class="hljs-keyword">import</span> { reportSpeed } <span class="hljs-keyword">from</span> <span class="hljs-string">'./utilities.js'</span>;</pre></div></div> </li> <li id="section-3"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-3">§</a> </div> <p>Import image from DOM</p> </div> <div class="content"><div class='highlight'><pre>scrawl.<span class="hljs-title function_">importDomImage</span>(<span class="hljs-string">'.flowers'</span>);</pre></div></div> </li> <li id="section-4"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-4">§</a> </div> <h4 id="scene-setup">Scene setup</h4> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> canvas = scrawl.<span class="hljs-property">library</span>.<span class="hljs-property">artefact</span>.<span class="hljs-property">mycanvas</span>;</pre></div></div> </li> <li id="section-5"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-5">§</a> </div> <p>For this Demo, we are creating a flag and pinning it to a pole. This is the pole.</p> </div> <div class="content"><div class='highlight'><pre>scrawl.<span class="hljs-title function_">makeLine</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'flagpole'</span>, <span class="hljs-attr">startX</span>: <span class="hljs-string">'center'</span>, <span class="hljs-attr">startY</span>: <span class="hljs-number">30</span>, <span class="hljs-attr">endX</span>: <span class="hljs-string">'center'</span>, <span class="hljs-attr">endY</span>: <span class="hljs-string">'bottom'</span>, <span class="hljs-attr">lineWidth</span>: <span class="hljs-number">8</span>, <span class="hljs-attr">lineCap</span>: <span class="hljs-string">'round'</span>, <span class="hljs-attr">strokeStyle</span>: <span class="hljs-string">'brown'</span>, <span class="hljs-attr">method</span>: <span class="hljs-string">'draw'</span>, })</pre></div></div> </li> <li id="section-6"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-6">§</a> </div> <h4 id="particle-physics-animation-scene">Particle physics animation scene</h4> </div> </li> <li id="section-7"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-7">§</a> </div> <p>Create a World object which we can then assign to the Net entity</p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> myWorld = scrawl.<span class="hljs-title function_">makeWorld</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'demo-world'</span>, <span class="hljs-attr">tickMultiplier</span>: <span class="hljs-number">2</span>, <span class="hljs-attr">userAttributes</span>: [ { <span class="hljs-attr">key</span>: <span class="hljs-string">'wind'</span>, <span class="hljs-attr">defaultValue</span>: <span class="hljs-number">0</span>, }, ], });</pre></div></div> </li> <li id="section-8"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-8">§</a> </div> <p>Create a ‘wind’ force; we will update the wind direction/strength as part of the Display cycle</p> </div> <div class="content"><div class='highlight'><pre>scrawl.<span class="hljs-title function_">makeForce</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'wind'</span>, <span class="hljs-attr">action</span>: <span class="hljs-function">(<span class="hljs-params">particle, world, host</span>) =></span> { particle.<span class="hljs-property">load</span>.<span class="hljs-title function_">vectorAdd</span>({</pre></div></div> </li> <li id="section-9"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-9">§</a> </div> <p>@ts-expect-error</p> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-attr">x</span>: world.<span class="hljs-property">wind</span>, <span class="hljs-attr">y</span>: <span class="hljs-number">0</span>, }); }, }); <span class="hljs-keyword">let</span> changeWind = <span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) {</pre></div></div> </li> <li id="section-10"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-10">§</a> </div> <p>@ts-expect-error</p> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-keyword">let</span> newWind = myWorld.<span class="hljs-property">wind</span> + <span class="hljs-title class_">Math</span>.<span class="hljs-title function_">random</span>() - <span class="hljs-number">0.5</span>; <span class="hljs-keyword">if</span> (newWind < -<span class="hljs-number">15</span>) newWind = -<span class="hljs-number">15</span>; <span class="hljs-keyword">if</span> (newWind > <span class="hljs-number">15</span>) newWind = <span class="hljs-number">15</span>; myWorld.<span class="hljs-title function_">set</span>({</pre></div></div> </li> <li id="section-11"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-11">§</a> </div> <p>@ts-expect-error</p> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-attr">wind</span>: newWind, }); };</pre></div></div> </li> <li id="section-12"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-12">§</a> </div> <p>Create a Net entity</p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> myNet = scrawl.<span class="hljs-title function_">makeNet</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'test-net'</span>,</pre></div></div> </li> <li id="section-13"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-13">§</a> </div> <p>Every net <strong>must</strong> be associated with a World object. The attribute’s value can be the World object’s String name value, or the object itself</p> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-attr">world</span>: myWorld,</pre></div></div> </li> <li id="section-14"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-14">§</a> </div> <p>The entity’s <code>start</code> coordinates determine where the first pin will be placed on the canvas</p> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-attr">startX</span>: <span class="hljs-string">'center'</span>, <span class="hljs-attr">startY</span>: <span class="hljs-number">40</span>,</pre></div></div> </li> <li id="section-15"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-15">§</a> </div> <p>The Net entity comes with four pre-defined <code>generate</code> functions - we will be testing ‘weak-net’ and ‘strong-net’ in this demo.</p> <ul> <li>We can define our own generate function if the pre-defined functions do not meet our needs.</li> </ul> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-attr">generate</span>: <span class="hljs-string">'weak-net'</span>,</pre></div></div> </li> <li id="section-16"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-16">§</a> </div> <p>The <code>postGenerate</code> function runs immediately after the <code>generate</code> function has created all of the Net entity’s Particle and Spring objects.</p> <ul> <li>If the <code>generate</code> function has defined particles and/or springs that we do not need, we can kill them here</li> <li>We can also set the attributes of specified Particles, including making them static (immobile, unaffected by forces and springs applied to them)</li> </ul> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-attr">postGenerate</span>: <span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) {</pre></div></div> </li> <li id="section-17"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-17">§</a> </div> <p>Names for ‘weak-net’ and ‘strong-net’ Particles are consistent: <code>${Net-entity-name}-${row-number}-${column-number}</code></p> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-keyword">const</span> regex = <span class="hljs-title class_">RegExp</span>(<span class="hljs-string">'.*(-0-0|-4-0|-9-0)$'</span>);</pre></div></div> </li> <li id="section-18"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-18">§</a> </div> <p>@ts-expect-error</p> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-variable language_">this</span>.<span class="hljs-property">particleStore</span>.<span class="hljs-title function_">forEach</span>(<span class="hljs-function"><span class="hljs-params">p</span> =></span> { <span class="hljs-keyword">if</span> (regex.<span class="hljs-title function_">test</span>(p.<span class="hljs-property">name</span>)) {</pre></div></div> </li> <li id="section-19"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-19">§</a> </div> <p>Change the appearance of the selected Particles, and remove the forces acting on them</p> </div> <div class="content"><div class='highlight'><pre> p.<span class="hljs-title function_">set</span>({ <span class="hljs-attr">fill</span>: <span class="hljs-string">'black'</span>, <span class="hljs-attr">stroke</span>: <span class="hljs-string">'black'</span>, <span class="hljs-attr">forces</span>: [], });</pre></div></div> </li> <li id="section-20"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-20">§</a> </div> <p>Prevent Springs associated with the selected Particles from moving them @ts-expect-error</p> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-variable language_">this</span>.<span class="hljs-property">springs</span>.<span class="hljs-title function_">forEach</span>(<span class="hljs-function"><span class="hljs-params">s</span> =></span> { <span class="hljs-keyword">if</span> (s && s.<span class="hljs-property">particleFrom</span> && s.<span class="hljs-property">particleFrom</span>.<span class="hljs-property">name</span> === p.<span class="hljs-property">name</span>) { s.<span class="hljs-property">particleFromIsStatic</span> = <span class="hljs-literal">true</span>; } <span class="hljs-keyword">if</span> (s && s.<span class="hljs-property">particleTo</span> && s.<span class="hljs-property">particleTo</span>.<span class="hljs-property">name</span> === p.<span class="hljs-property">name</span>) { s.<span class="hljs-property">particleToIsStatic</span> = <span class="hljs-literal">true</span>; } }) } }); },</pre></div></div> </li> <li id="section-21"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-21">§</a> </div> <p>We tell the Net entity how many rows and columns of Particles we want it to create</p> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-attr">rows</span>: <span class="hljs-number">10</span>, <span class="hljs-attr">columns</span>: <span class="hljs-number">14</span>,</pre></div></div> </li> <li id="section-22"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-22">§</a> </div> <p>The distance between rows and columns can be set using either absolute (px) Number values, or relative % String values</p> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-attr">rowDistance</span>: <span class="hljs-number">15</span>, <span class="hljs-attr">columnDistance</span>: <span class="hljs-string">'5%'</span>,</pre></div></div> </li> <li id="section-23"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-23">§</a> </div> <p>We can get the Net entity to display its springs</p> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-attr">showSprings</span>: <span class="hljs-literal">true</span>, <span class="hljs-attr">showSpringsColor</span>: <span class="hljs-string">'green'</span>,</pre></div></div> </li> <li id="section-24"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-24">§</a> </div> <p>Particle physics attributes</p> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-attr">mass</span>: <span class="hljs-number">1</span>, <span class="hljs-attr">forces</span>: [<span class="hljs-string">'gravity'</span>, <span class="hljs-string">'wind'</span>],