scrawl-canvas

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class="sswrap "> <a class="ss" href="#section-1">§</a> </div> <h1 id="demo-canvas-044">Demo Canvas 044</h1> <p>Building more complex patterns</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/canvas-044.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">const</span> canvas = scrawl.<span class="hljs-property">library</span>.<span class="hljs-property">canvas</span>.<span class="hljs-property">mycanvas</span>; canvas.<span class="hljs-title function_">setBase</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 order in which we compile Cells becomes important when building more complex patterns with additional Cells</p> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-attr">compileOrder</span>: <span class="hljs-number">2</span>, });</pre></div></div> </li> <li id="section-5"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-5">§</a> </div> <p>STEP 1. We define a gradient, then apply it to some Blocks we create in a new canvas Cell. This gives us a more interesting gradient pattern than the default ‘linear’ and ‘radial’ gradients supplied by the Canvas API</p> </div> <div class="content"><div class='highlight'><pre>scrawl.<span class="hljs-title function_">makeGradient</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'linear'</span>, <span class="hljs-attr">endX</span>: <span class="hljs-string">'100%'</span>, <span class="hljs-attr">endY</span>: <span class="hljs-string">'100%'</span>, <span class="hljs-attr">colors</span>: [ [<span class="hljs-number">0</span>, <span class="hljs-string">'white'</span>], [<span class="hljs-number">420</span>, <span class="hljs-string">'red'</span>], [<span class="hljs-number">500</span>, <span class="hljs-string">'yellow'</span>], [<span class="hljs-number">580</span>, <span class="hljs-string">'red'</span>], [<span class="hljs-number">999</span>, <span class="hljs-string">'black'</span>], ], });</pre></div></div> </li> <li id="section-6"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-6">§</a> </div> <p>Add a new Cell to our canvas</p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> patternCell = canvas.<span class="hljs-title function_">buildCell</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'gradient-pattern-cell'</span>, <span class="hljs-attr">dimensions</span>: [<span class="hljs-number">50</span>, <span class="hljs-number">50</span>], <span class="hljs-attr">shown</span>: <span class="hljs-literal">false</span>, <span class="hljs-attr">useAsPattern</span>: <span class="hljs-literal">true</span>, <span class="hljs-attr">compileOrder</span>: <span class="hljs-number">0</span>, });</pre></div></div> </li> <li id="section-7"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-7">§</a> </div> <p>Populate our new Cell with Block entitys that use our linear gradient</p> </div> <div class="content"><div class='highlight'><pre>scrawl.<span class="hljs-title function_">makeBlock</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'gradient-block-br'</span>, <span class="hljs-attr">group</span>: <span class="hljs-string">'gradient-pattern-cell'</span>, <span class="hljs-attr">dimensions</span>: [<span class="hljs-number">25</span>, <span class="hljs-number">25</span>], <span class="hljs-attr">start</span>: [<span class="hljs-string">'center'</span>, <span class="hljs-string">'center'</span>], <span class="hljs-attr">fillStyle</span>: <span class="hljs-string">'linear'</span>, <span class="hljs-attr">lockFillStyleToEntity</span>: <span class="hljs-literal">true</span>, }).<span class="hljs-title function_">clone</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'gradient-block-bl'</span>, <span class="hljs-attr">roll</span>: <span class="hljs-number">90</span>, }).<span class="hljs-title function_">clone</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'gradient-block-tl'</span>, <span class="hljs-attr">roll</span>: <span class="hljs-number">180</span>, }).<span class="hljs-title function_">clone</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'gradient-block-tr'</span>, <span class="hljs-attr">roll</span>: <span class="hljs-number">270</span>, });</pre></div></div> </li> <li id="section-8"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-8">§</a> </div> <p>STEP 2. Apply a Noise-based displacement filter to our pattern Cell. We can then animate this filter to make it more interesting</p> </div> </li> <li id="section-9"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-9">§</a> </div> <p>Create the Noise asset</p> </div> <div class="content"><div class='highlight'><pre>scrawl.<span class="hljs-title function_">makeNoiseAsset</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'my-noise-generator'</span>, <span class="hljs-attr">width</span>: <span class="hljs-number">50</span>, <span class="hljs-attr">height</span>: <span class="hljs-number">50</span>, <span class="hljs-attr">octaves</span>: <span class="hljs-number">5</span>, <span class="hljs-attr">scale</span>: <span class="hljs-number">2</span>, <span class="hljs-attr">noiseEngine</span>: <span class="hljs-string">'simplex'</span>, });</pre></div></div> </li> <li id="section-10"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-10">§</a> </div> <p>TEST: see if we can load the Noise asset directly into a Picture entity, and into a Pattern style - we’ll use these for background textures.</p> </div> <div class="content"><div class='highlight'><pre>scrawl.<span class="hljs-title function_">makePicture</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'test-picture'</span>, <span class="hljs-attr">dimensions</span>: [<span class="hljs-number">300</span>, <span class="hljs-number">400</span>], <span class="hljs-attr">copyDimensions</span>: [<span class="hljs-string">'100%'</span>, <span class="hljs-string">'100%'</span>], <span class="hljs-attr">asset</span>: <span class="hljs-string">'my-noise-generator'</span>, <span class="hljs-attr">globalAlpha</span>: <span class="hljs-number">0.2</span>, }); scrawl.<span class="hljs-title function_">makePattern</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'test-pattern'</span>, <span class="hljs-attr">asset</span>: <span class="hljs-string">'my-noise-generator'</span>, }); scrawl.<span class="hljs-title function_">makeBlock</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'test-pattern-block'</span>, <span class="hljs-attr">startX</span>: <span class="hljs-number">300</span>, <span class="hljs-attr">dimensions</span>: [<span class="hljs-number">300</span>, <span class="hljs-number">400</span>], <span class="hljs-attr">fillStyle</span>: <span class="hljs-string">'test-pattern'</span>, <span class="hljs-attr">globalAlpha</span>: <span class="hljs-number">0.2</span>, });</pre></div></div> </li> <li id="section-11"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-11">§</a> </div> <p>Build filters that use the Noise asset</p> </div> <div class="content"><div class='highlight'><pre>scrawl.<span class="hljs-title function_">makeFilter</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'noise'</span>, <span class="hljs-attr">method</span>: <span class="hljs-string">'image'</span>, <span class="hljs-attr">asset</span>: <span class="hljs-string">'my-noise-generator'</span>, <span class="hljs-attr">width</span>: <span class="hljs-number">400</span>, <span class="hljs-attr">height</span>: <span class="hljs-number">400</span>, <span class="hljs-attr">copyWidth</span>: <span class="hljs-string">'100%'</span>, <span class="hljs-attr">copyHeight</span>: <span class="hljs-string">'100%'</span>, <span class="hljs-attr">lineOut</span>: <span class="hljs-string">'map'</span>, }); <span class="hljs-keyword">const</span> displacer = scrawl.<span class="hljs-title function_">makeFilter</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'displace'</span>, <span class="hljs-attr">method</span>: <span class="hljs-string">'displace'</span>, <span class="hljs-attr">lineMix</span>: <span class="hljs-string">'map'</span>, <span class="hljs-attr">scaleX</span>: <span class="hljs-number">20</span>, <span class="hljs-attr">scaleY</span>: <span class="hljs-number">20</span>, });</pre></div></div> </li> <li id="section-12"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-12">§</a> </div> <p>Update our Cell with the filters</p> </div> <div class="content"><div class='highlight'><pre>patternCell.<span class="hljs-title function_">set</span>({ <span class="hljs-attr">filters</span>: [<span class="hljs-string">'noise'</span>, <span class="hljs-string">'displace'</span>] });</pre></div></div> </li> <li id="section-13"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-13">§</a> </div> <p>Animate the displacer filter using a Tween</p> </div> <div class="content"><div class='highlight'><pre>scrawl.<span class="hljs-title function_">makeTween</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'turbulence'</span>, <span class="hljs-attr">duration</span>: <span class="hljs-number">6000</span>, <span class="hljs-attr">targets</span>: displacer, <span class="hljs-attr">cycles</span>: <span class="hljs-number">0</span>, <span class="hljs-attr">reverseOnCycleEnd</span>: <span class="hljs-literal">true</span>, <span class="hljs-attr">definitions</span>: [ { <span class="hljs-attr">attribute</span>: <span class="hljs-string">'scaleX'</span>, <span class="hljs-attr">start</span>: <span class="hljs-number">1</span>, <span class="hljs-attr">end</span>: <span class="hljs-number">150</span>, <span class="hljs-attr">engine</span>: <span class="hljs-string">'easeOutIn'</span> }, { <span class="hljs-attr">attribute</span>: <span class="hljs-string">'scaleY'</span>, <span class="hljs-attr">start</span>: <span class="hljs-number">150</span>, <span class="hljs-attr">end</span>: <span class="hljs-number">1</span>, <span class="hljs-attr">engine</span>: <span class="hljs-string">'easeOutIn'</span> }, ] }).<span class="hljs-title function_">run</span>();</pre></div></div> </li> <li id="section-14"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-14">§</a> </div> <p>STEP 3. We are now in a position where we can use our Cells as pattern fills for some SC entitys.</p> </div> <div class="content"><div class='highlight'><pre>scrawl.<span class="hljs-title function_">makePolygon</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'hex'</span>, <span class="hljs-attr">sides</span>: <span class="hljs-number">6</span>, <span class="hljs-attr">sideLength</span>: <span class="hljs-number">90</span>, <span class="hljs-attr">roll</span>: <span class="hljs-number">30</span>, <span class="hljs-attr">start</span>: [<span class="hljs-number">470</span>, <span class="hljs-number">140</span>], <span class="hljs-attr">lineWidth</span>: <span class="hljs-number">2</span>, <span class="hljs-attr">strokeStyle</span>: <span class="hljs-string">'green'</span>, <span class="hljs-attr">lineJoin</span>: <span class="hljs-string">'round'</span>, <span class="hljs-attr">method</span>: <span class="hljs-string">'fillThenDraw'</span>,</pre></div></div> </li> <li id="section-15"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-15">§</a> </div> <p>To use a Cell as a pattern we just assign its name to the entity’s fillStyle attribute fillStyle: ‘warped-pattern’,</p> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-attr">fillStyle</span>: <span class="hljs-string">'gradient-pattern-cell'</span>, });</pre></div></div> </li> <li id="section-16"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-16">§</a> </div> <p>STEP 4. If we want, we can add some color-based filters to our entitys, to give our pattern a different look.</p> </div> <div class="content"><div class='highlight'><pre>scrawl.<span class="hljs-title function_">makeFilter</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'notred'</span>, <span class="hljs-attr">method</span>: <span class="hljs-string">'notred'</span>, }).<span class="hljs-title function_">clone</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'sepia'</span>, <span class="hljs-attr">method</span>: <span class="hljs-string">'sepia'</span>, }).<span class="hljs-title function_">clone</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'invert'</span>, <span class="hljs-attr">method</span>: <span class="hljs-string">'invert'</span>, }); scrawl.<span class="hljs-title function_">makeOval</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'egg'</span>, <span class="hljs-attr">radiusX</span>: <span class="hljs-number">60</span>, <span class="hljs-attr">radiusY</span>: <span class="hljs-number">80</span>, <span class="hljs-attr">roll</span>: <span class="hljs-number"