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class="sswrap "> <a class="ss" href="#section-1">§</a> </div> <h1 id="demo-particles-010">Demo Particles 010</h1> <p>Net entity: using a shape path as a net template</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-010.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> <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-4"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-4">§</a> </div> <p>For this Demo, we are creating some Shape entitys and using them as a template for generating Net entity Particles.</p> </div> <div class="content"><div class='highlight'><pre>scrawl.<span class="hljs-title function_">makeShape</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'my-first-template-arrow'</span>, <span class="hljs-attr">pathDefinition</span>: <span class="hljs-string">'M266.2,703.1 h-178 L375.1,990 l287-286.9 H481.9 C507.4,365,683.4,91.9,911.8,25.5 877,15.4,840.9,10,803.9,10 525.1,10,295.5,313.4,266.2,703.1 z'</span>, <span class="hljs-attr">start</span>: [<span class="hljs-string">'25%'</span>, <span class="hljs-string">'25%'</span>], <span class="hljs-attr">handle</span>: [<span class="hljs-string">'center'</span>, <span class="hljs-string">'center'</span>], <span class="hljs-attr">scale</span>: <span class="hljs-number">0.3</span>, <span class="hljs-attr">roll</span>: -<span class="hljs-number">90</span>, <span class="hljs-attr">flipUpend</span>: <span class="hljs-literal">true</span>, <span class="hljs-attr">useAsPath</span>: <span class="hljs-literal">true</span>, <span class="hljs-attr">fillStyle</span>: <span class="hljs-string">'gray'</span>, }).<span class="hljs-title function_">clone</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'my-second-template-arrow'</span>, <span class="hljs-attr">start</span>: [<span class="hljs-string">'50%'</span>, <span class="hljs-string">'50%'</span>], }).<span class="hljs-title function_">clone</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'my-third-template-arrow'</span>, <span class="hljs-attr">start</span>: [<span class="hljs-string">'75%'</span>, <span class="hljs-string">'75%'</span>], });</pre></div></div> </li> <li id="section-5"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-5">§</a> </div> <h4 id="particle-physics-animation-scene">Particle physics animation scene</h4> </div> </li> <li id="section-6"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-6">§</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>, });</pre></div></div> </li> <li id="section-7"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-7">§</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">'weak-arrow'</span>, <span class="hljs-attr">world</span>: myWorld,</pre></div></div> </li> <li id="section-8"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-8">§</a> </div> <p>The Net entity comes with four pre-defined <code>generate</code> functions - we will be testing ‘weak-shape’ and ‘strong-shape’ 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-shape'</span>, <span class="hljs-attr">shapeTemplate</span>: <span class="hljs-string">'my-first-template-arrow'</span>, <span class="hljs-attr">precision</span>: <span class="hljs-number">40</span>, <span class="hljs-attr">joinTemplateEnds</span>: <span class="hljs-literal">true</span>, <span class="hljs-attr">postGenerate</span>: <span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) { <span class="hljs-keyword">const</span> regex = <span class="hljs-title class_">RegExp</span>(<span class="hljs-string">'-0$'</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-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>)) { p.<span class="hljs-title function_">set</span>({ <span class="hljs-attr">fill</span>: <span class="hljs-string">'red'</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-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-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>; } }) } }); }, <span class="hljs-attr">showSprings</span>: <span class="hljs-literal">true</span>, <span class="hljs-attr">showSpringsColor</span>: <span class="hljs-string">'azure'</span>, <span class="hljs-attr">springConstant</span>: <span class="hljs-number">100</span>, <span class="hljs-attr">damperConstant</span>: <span class="hljs-number">1</span>, <span class="hljs-attr">engine</span>: <span class="hljs-string">'runge-kutta'</span>, <span class="hljs-attr">artefact</span>: scrawl.<span class="hljs-title function_">makeWheel</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'particle-wheel-1'</span>, <span class="hljs-attr">radius</span>: <span class="hljs-number">7</span>, <span class="hljs-attr">handle</span>: [<span class="hljs-string">'center'</span>, <span class="hljs-string">'center'</span>], <span class="hljs-attr">method</span>: <span class="hljs-string">'fillThenDraw'</span>, <span class="hljs-attr">fillStyle</span>: <span class="hljs-string">'yellow'</span>, <span class="hljs-attr">strokeStyle</span>: <span class="hljs-string">'gold'</span>, <span class="hljs-attr">visibility</span>: <span class="hljs-literal">false</span>, <span class="hljs-attr">noUserInteraction</span>: <span class="hljs-literal">true</span>, <span class="hljs-attr">noPositionDependencies</span>: <span class="hljs-literal">true</span>, <span class="hljs-attr">noFilters</span>: <span class="hljs-literal">true</span>, <span class="hljs-attr">noDeltaUpdates</span>: <span class="hljs-literal">true</span>, }), <span class="hljs-attr">stampAction</span>: <span class="hljs-keyword">function</span> (<span class="hljs-params">artefact, particle, host</span>) { <span class="hljs-keyword">let</span> [r, z, ...start] = particle.<span class="hljs-property">history</span>[<span class="hljs-number">0</span>]; artefact.<span class="hljs-title function_">simpleStamp</span>(host, { start, <span class="hljs-attr">fillStyle</span>: particle.<span class="hljs-property">fill</span>, <span class="hljs-attr">strokeStyle</span>: particle.<span class="hljs-property">stroke</span>, }); }, <span class="hljs-attr">particlesAreDraggable</span>: <span class="hljs-literal">true</span>,</pre></div></div> </li> <li id="section-11"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-11">§</a> </div> <p>Clone the Net entity</p> </div> <div class="content"><div class='highlight'><pre>}).<span class="hljs-title function_">clone</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'strong-arrow'</span>, <span class="hljs-attr">generate</span>: <span class="hljs-string">'strong-shape'</span>, <span class="hljs-attr">shapeTemplate</span>: <span class="hljs-string">'my-second-template-arrow'</span>, <span class="hljs-attr">artefact</span>: scrawl.<span class="hljs-property">library</span>.<span class="hljs-property">artefact</span>[<span class="hljs-string">'particle-wheel-1'</span>].<span class="hljs-title function_">clone</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'particle-wheel-2'</span>, }),</pre></div></div> </li> <li id="section-12"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-12">§</a> </div> <p>Clone again</p> </div> <div class="content"><div class='highlight'><pre>}).<span class="hljs-title function_">clone</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'hub-spoke-arrow'</span>, <span class="hljs-attr">generate</span>: <span class="hljs-string">'hub-spoke'</span>, <span class="hljs-attr">shapeTemplate</span>: <span class="hljs-string">'my-third-template-arrow'</span>, <span class="hljs-attr">artefact</span>: scrawl.<span class="hljs-property">library</span>.<span class="hljs-property">artefact</span>[<span class="hljs-string">'particle-wheel-1'</span>].<span class="hljs-title function_">clone</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'particle-wheel-3'</span>, }), });</pre></div></div> </li> <li id="section-13"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-13">§</a> </div> <h4 id="scene-animation">Scene animation</h4> <p>Function to display frames-per-second data, and other information relevant to the demo</p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> report = <span class="hljs-title function_">reportSpeed</span>(<span class="hljs-string">'#reportmessage'</span>);</pre></div></div> </li> <li id="section-14"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-14">§</a> </div> <p>Create the Display cycle animation</p> </div> <div class="content"><div class='highlight'><pre>scrawl.<span class="hljs-title function_">makeRender</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'demo-animation'</span>, <span class="hljs-attr">target</span>: canvas, <span class="hljs-attr">afterShow</span>: report, });</pre></div></div> </li> <li id="section-15"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-15">§</a> </div> <h4 id="user-interaction">User interaction</h4> <p>Make the Net entity’s Particles draggable</p> <ul> <li>KNOWN BUG - the particles are not draggable on first user mousedown, but are draggable afterwards</li> </ul> </div> <div class="content"><div class='highlight'><pre>scrawl.<span class="hljs-title function_">makeGroup</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'my-draggable-group'</span>, }).<span class="hljs-title function_">addArtefacts</span>(<span class="hljs-string">'weak-arrow'</span>, <span class="hljs-string">'strong-arrow'</span>, <span class="hljs-string">'hub-spoke-arrow'</span>); scrawl.<span class="hljs-title function_">makeDragZone</span>({ <span class="hljs-attr">zone</span>: canvas, <span class="hljs-attr">collisionGroup</span>: <span class="hljs-string">'my-draggable-group'</span>, <span class="hljs-attr">endOn</span>: [<span class="hljs-string">'up'</span>, <span class="hljs-string">'leave'</span>], <span class="hljs-attr">preventTouchDefaultWhenDragging</span>: <span class="hljs-literal">true</span>, });</pre></div></div> </li> <li id="section-16"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-16">§</a> </div> <h4 id="development-and-testing">Development and testing</h4> </div> <div class="content"><div class='highlight'><pre><span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(scrawl.<span class="hljs-property">library</span>);</pre></div></div> </li> </ul> </div> </body> </