scrawl-canvas

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class="sswrap "> <a class="ss" href="#section-1">§</a> </div> <h1 id="demo-delaunator-002">Demo Delaunator 002</h1> <p>Responsive Voronoi cells in a RawAsset wrapper</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/delaunator-002.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>;</pre></div></div> </li> <li id="section-3"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-3">§</a> </div> <p>@ts-expect-error</p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">import</span> <span class="hljs-title class_">Delaunator</span> <span class="hljs-keyword">from</span> <span class="hljs-string">'https://cdn.skypack.dev/delaunator@5.0.0'</span>; <span class="hljs-keyword">import</span> { reportSpeed, addImageDragAndDrop } <span class="hljs-keyword">from</span> <span class="hljs-string">'./utilities.js'</span>;</pre></div></div> </li> <li id="section-4"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-4">§</a> </div> <p>The following functions are used to handle the Delaunay object</p> <ul> <li>Code adapted from the <a href="https://mapbox.github.io/delaunator/">Delaunator Guide website</a></li> </ul> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> <span class="hljs-title function_">edgesOfTriangle</span> = (<span class="hljs-params">t</span>) => [<span class="hljs-number">3</span> * t, <span class="hljs-number">3</span> * t + <span class="hljs-number">1</span>, <span class="hljs-number">3</span> * t + <span class="hljs-number">2</span>]; <span class="hljs-keyword">const</span> <span class="hljs-title function_">pointsOfTriangle</span> = (<span class="hljs-params">del, t</span>) => { <span class="hljs-keyword">let</span> { triangles } = del; <span class="hljs-keyword">return</span> <span class="hljs-title function_">edgesOfTriangle</span>(t).<span class="hljs-title function_">map</span>(<span class="hljs-function"><span class="hljs-params">e</span> =></span> triangles[e]); }; <span class="hljs-keyword">const</span> <span class="hljs-title function_">triangleOfEdge</span> = (<span class="hljs-params">e</span>) => <span class="hljs-title class_">Math</span>.<span class="hljs-title function_">floor</span>(e / <span class="hljs-number">3</span>); <span class="hljs-keyword">const</span> <span class="hljs-title function_">triangleCenter</span> = (<span class="hljs-params">pts, del, t</span>) => { <span class="hljs-keyword">const</span> vertices = <span class="hljs-title function_">pointsOfTriangle</span>(del, t).<span class="hljs-title function_">map</span>(<span class="hljs-function"><span class="hljs-params">p</span> =></span> pts[p]); <span class="hljs-keyword">return</span> <span class="hljs-title function_">circumcenter</span>(vertices[<span class="hljs-number">0</span>], vertices[<span class="hljs-number">1</span>], vertices[<span class="hljs-number">2</span>]); }; <span class="hljs-keyword">const</span> <span class="hljs-title function_">circumcenter</span> = (<span class="hljs-params">a, b, c</span>) => { <span class="hljs-keyword">if</span> (a && b && c && a.<span class="hljs-property">length</span> && b.<span class="hljs-property">length</span> && c.<span class="hljs-property">length</span>) { <span class="hljs-keyword">const</span> ad = a[<span class="hljs-number">0</span>] * a[<span class="hljs-number">0</span>] + a[<span class="hljs-number">1</span>] * a[<span class="hljs-number">1</span>], bd = b[<span class="hljs-number">0</span>] * b[<span class="hljs-number">0</span>] + b[<span class="hljs-number">1</span>] * b[<span class="hljs-number">1</span>], cd = c[<span class="hljs-number">0</span>] * c[<span class="hljs-number">0</span>] + c[<span class="hljs-number">1</span>] * c[<span class="hljs-number">1</span>]; <span class="hljs-keyword">const</span> D = <span class="hljs-number">2</span> * (a[<span class="hljs-number">0</span>] * (b[<span class="hljs-number">1</span>] - c[<span class="hljs-number">1</span>]) + b[<span class="hljs-number">0</span>] * (c[<span class="hljs-number">1</span>] - a[<span class="hljs-number">1</span>]) + c[<span class="hljs-number">0</span>] * (a[<span class="hljs-number">1</span>] - b[<span class="hljs-number">1</span>])); <span class="hljs-keyword">return</span> [ <span class="hljs-number">1</span> / D * (ad * (b[<span class="hljs-number">1</span>] - c[<span class="hljs-number">1</span>]) + bd * (c[<span class="hljs-number">1</span>] - a[<span class="hljs-number">1</span>]) + cd * (a[<span class="hljs-number">1</span>] - b[<span class="hljs-number">1</span>])), <span class="hljs-number">1</span> / D * (ad * (c[<span class="hljs-number">0</span>] - b[<span class="hljs-number">0</span>]) + bd * (a[<span class="hljs-number">0</span>] - c[<span class="hljs-number">0</span>]) + cd * (b[<span class="hljs-number">0</span>] - a[<span class="hljs-number">0</span>])), ]; } }; <span class="hljs-keyword">const</span> <span class="hljs-title function_">forEachVoronoiEdge</span> = (<span class="hljs-params">pts, del, cb</span>) => { <span class="hljs-keyword">if</span> (del) { <span class="hljs-keyword">let</span> { triangles, halfedges } = del; <span class="hljs-keyword">let</span> len = triangles.<span class="hljs-property">length</span>; <span class="hljs-keyword">for</span> (<span class="hljs-keyword">let</span> e = <span class="hljs-number">0</span>; e < len; e++) { <span class="hljs-keyword">if</span> (e < halfedges[e]) { <span class="hljs-keyword">const</span> p = <span class="hljs-title function_">triangleCenter</span>(pts, del, <span class="hljs-title function_">triangleOfEdge</span>(e)); <span class="hljs-keyword">const</span> q = <span class="hljs-title function_">triangleCenter</span>(pts, del, <span class="hljs-title function_">triangleOfEdge</span>(halfedges[e])); <span class="hljs-title function_">cb</span>(e, p, q); } } } };</pre></div></div> </li> <li id="section-5"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-5">§</a> </div> <h4 id="scene-setup">Scene setup</h4> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</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-6"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-6">§</a> </div> <p>Import image from DOM, and create Picture entity using it</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-7"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-7">§</a> </div> <p>Magic number - base Cell dimensions</p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> baseDimension = <span class="hljs-number">400</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 the coordinates to be used as the Voronoi web’s points - for this demo these coordinates will be static, except for the first point which will track the mouse cursor position over the canvas</p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> coordArray = [], center = [baseDimension/<span class="hljs-number">2</span>, baseDimension/<span class="hljs-number">2</span>]; <span class="hljs-keyword">for</span> (<span class="hljs-keyword">let</span> i = <span class="hljs-number">0</span>; i < <span class="hljs-number">200</span>; i++) { <span class="hljs-keyword">const</span> x = <span class="hljs-title class_">Math</span>.<span class="hljs-title function_">floor</span>(<span class="hljs-title class_">Math</span>.<span class="hljs-title function_">random</span>() * (baseDimension * <span class="hljs-number">2</span>) - (baseDimension / <span class="hljs-number">2</span>)); <span class="hljs-keyword">const</span> y = <span class="hljs-title class_">Math</span>.<span class="hljs-title function_">floor</span>(<span class="hljs-title class_">Math</span>.<span class="hljs-title function_">random</span>() * (baseDimension * <span class="hljs-number">2</span>) - (baseDimension / <span class="hljs-number">2</span>)); coordArray.<span class="hljs-title function_">push</span>([x, y]); }</pre></div></div> </li> <li id="section-9"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-9">§</a> </div> <p>We build the Voronoi web in a RawAsset wrapper</p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> myAsset = scrawl.<span class="hljs-title function_">makeRawAsset</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'voronoi-web'</span>, <span class="hljs-attr">userAttributes</span>: [{</pre></div></div> </li> <li id="section-10"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-10">§</a> </div> <p><strong>points</strong> - an array holding the coordinate arrays we generate elsewhere</p> <ul> <li>For this demo, we will be updating the first coordinate point with the mouse cursor’s position when it is over the canvas element</li> </ul> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-attr">key</span>: <span class="hljs-string">'points'</span>, <span class="hljs-attr">defaultValue</span>: [], <span class="hljs-attr">setter</span>: <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) { <span class="hljs-variable language_">this</span>.<span class="hljs-property">points</span> = [...item]; }, },{</pre></div></div> </li> <li id="section-11"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-11">§</a> </div> <p><strong>here</strong> - a handle to our Canvas wrapper’s base Cell’s <code>here</code> object, which gives us the current mouse cursor coordinates</p> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-attr">key</span>: <span class="hljs-string">'here'</span>, <span class="hljs-attr">defaultValue</span>: <span class="hljs-literal">null</span>, },{</pre></div></div> </li> <li id="section-12"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-12">§</a> </div> <p><strong>delaunay</strong> - a handle to the current Delaunator object we recreate on each update</p> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-attr">key</span>: <span class="hljs-string">'delaunay'</span>, <span class="hljs-attr">defaultValue</span>: <span class="hljs-literal">null</span>, },{</pre></div></div> </li> <li id="section-13"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-13">§</a> </div> <p><strong>canvasWidth</strong>, <strong>canvasHeight</strong> - make the RawAsset’s dimensions the same as our canvas base Cell’s dimensions</p> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-attr">key</span>: <span class="hljs-string">'canvasWidth'</span>, <span class="hljs-attr">defaultValue</span>: baseDimension, },{ <span class="hljs-attr">key</span>: <span class="hljs-string">'canvasHeight'</span>, <span class="hljs-attr">defaultValue</span>: baseDimension, },{</pre></div></div> </li> <li id="section-14"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-14">§</a> </div> <p><strong>trigger</strong> - we update the RawAsset at the start of each Display cycle by setting its <code>trigger</code> attribute. All the work with recreating the Delaunator object happens here</p> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-attr">key</span>: <span class="hljs-string">'trigger'</span>, <span class="hljs-attr">defaultValue</span>: <span class="hljs-literal">false</span>, <span class="hljs-attr">setter</span>: <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) {</pre></div></div> </li> <li id="section-15"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-15">§</a> </div> <p>@ts-expect-error</p> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-keyword">const</span> { points, here } = <span class="hljs-variable language_">this</span>; <span class="hljs-keyword">if</span> (here && here.<span class="hljs-property">active</span>) points[<span class="hljs-number">0</span>] = [here.<span class="hljs-property">x</span>, here.<span class="hljs-property">y</span>]; <span class="hljs-keyword">else</span> points[<span class="hljs-number">0</span>] = [...center]; <span class="hljs-variable language_">this</span>.<span class="hljs-property">delaunay</span> = <span class="hljs-title class_">Delaunator</span>.<span class="hljs-title function_">from</span>(points); <span class="hljs-variable language_">this</span>.<span class="hljs-property">dirtyData</span> = item; }, }],</pre></div></div> </li> <li id="section-16"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-16">§</a> </div> <p><code>assetWrapper</code> is the same as <code>this</code> when function is declared with the function keyword</p> <ul> <li>We clear the RawAsset’s canvas, then draw the updated Voronoi web onto it</li> </ul> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-attr">updateSource</span>: <span class="hljs-keyword">function</span> (<span class="hljs-params">assetWrapper</span>) { <span class="hljs-keyword">const</span> { element, engine, points, delaunay, canvasWidth, canvasHeight } = assetWrapper; element.<span class="hljs-property">width</span> = canvasWidth; <span class="hljs-keyword">if</span> (!element.<span class="hljs-property">height</span>) element.<span class="hljs-property">height</span> = canvasHeight; engine.<span class="hljs-property">strokeStyle</span> = <span class="hljs-string">'black'</span>; engine.<span class="hljs-property">lineWidth<