scrawl-canvas
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<h1 id="rawasset-factory">RawAsset factory</h1>
<p>The Scrawl-canvas RawAsset object allows developers to extend the ability and functionality of the library. It can:</p>
<ul>
<li>Act as a link between third-party code and Scrawl-canvas, for instance allowing us to use the output of a Delauney triangulation library to render Voronoi cells into a Scrawl-canvas scene</li>
<li>Interpret the output of complex machine learning models (for instance: TensorFlow and MediaPipe models) to build real-time scenes</li>
<li>Build complex displays from simpler building blocks - for instance by interpreting the output from a NoiseAsset object to process an image asset, allowing us to simulate impressionistic styles of painting.</li>
</ul>
</div>
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<h4 id="demos">Demos:</h4>
<ul>
<li><a href="../../demo/canvas-052.html">Canvas-052</a> - Create and use a RawAsset object to modify an image asset</li>
<li><a href="../../demo/delaunator-002.html">Delaunator-002</a> - Responsive Voronoi cells in a RawAsset wrapper</li>
<li><a href="../../demo/mediapipe-001.html">MediaPipe-001</a> - MediaPipe Selfie Segmentation - model image output</li>
<li><a href="../../demo/mediapipe-002.html">MediaPipe-002</a> - MediaPipe Face Mesh - model image output</li>
<li><a href="../../demo/mediapipe-003.html">MediaPipe-003</a> - MediaPipe Face Mesh - working with the mesh coordinates</li>
<li><a href="../../demo/tensorflow-001.html">TensorFlow-001</a> - Tensorflow tfjs-models / body-pix experiment - follow my eyes</li>
<li><a href="../../demo/tensorflow-002.html">TensorFlow-002</a> - Tensorflow tfjs-models / body-pix experiment - model image output</li>
</ul>
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<h4 id="imports">Imports</h4>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">import</span> { constructors } <span class="hljs-keyword">from</span> <span class="hljs-string">'../core/library.js'</span>;
<span class="hljs-keyword">import</span> { mergeOver, Ωempty, λ<span class="hljs-literal">null</span>, λ<span class="hljs-variable language_">this</span>, xt, isa_fn } <span class="hljs-keyword">from</span> <span class="hljs-string">'../core/utilities.js'</span>;
<span class="hljs-keyword">import</span> baseMix <span class="hljs-keyword">from</span> <span class="hljs-string">'../mixin/base.js'</span>;
<span class="hljs-keyword">import</span> assetMix <span class="hljs-keyword">from</span> <span class="hljs-string">'../mixin/asset.js'</span>;</pre></div></div>
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<h4 id="rawasset-constructor">RawAsset constructor</h4>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> <span class="hljs-title class_">RawAsset</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">items = Ωempty</span>) {
<span class="hljs-variable language_">this</span>.<span class="hljs-title function_">makeName</span>(items.<span class="hljs-property">name</span>);
<span class="hljs-variable language_">this</span>.<span class="hljs-title function_">register</span>();
<span class="hljs-variable language_">this</span>.<span class="hljs-property">subscribers</span> = [];
<span class="hljs-variable language_">this</span>.<span class="hljs-title function_">set</span>(<span class="hljs-variable language_">this</span>.<span class="hljs-property">defs</span>);
<span class="hljs-variable language_">this</span>.<span class="hljs-property">updateSource</span> = λ<span class="hljs-literal">null</span>;
<span class="hljs-keyword">let</span> keytypes = items.<span class="hljs-property">keytypes</span> || {};
<span class="hljs-keyword">if</span> (items.<span class="hljs-property">userAttributes</span>) {
items.<span class="hljs-property">userAttributes</span>.<span class="hljs-title function_">forEach</span>(<span class="hljs-function"><span class="hljs-params">att</span> =></span> {
<span class="hljs-variable language_">this</span>.<span class="hljs-title function_">addAttribute</span>(att);
<span class="hljs-keyword">if</span> (att.<span class="hljs-property">type</span>) keytypes[att.<span class="hljs-property">key</span>] = att.<span class="hljs-property">type</span>;
});
}
<span class="hljs-variable language_">this</span>.<span class="hljs-title function_">initializeAttributes</span>(keytypes);
<span class="hljs-variable language_">this</span>.<span class="hljs-title function_">set</span>(items);
<span class="hljs-keyword">let</span> cell = <span class="hljs-variable language_">document</span>.<span class="hljs-title function_">createElement</span>(<span class="hljs-string">'canvas'</span>);
cell.<span class="hljs-property">width</span> = <span class="hljs-number">0</span>;
cell.<span class="hljs-property">height</span> = <span class="hljs-number">0</span>;
<span class="hljs-variable language_">this</span>.<span class="hljs-property">element</span> = cell;
<span class="hljs-variable language_">this</span>.<span class="hljs-property">engine</span> = cell.<span class="hljs-title function_">getContext</span>(<span class="hljs-string">'2d'</span>, {<span class="hljs-attr">willReadFrequently</span>: <span class="hljs-literal">true</span>});
<span class="hljs-keyword">if</span> (items.<span class="hljs-property">subscribe</span>) <span class="hljs-variable language_">this</span>.<span class="hljs-property">subscribers</span>.<span class="hljs-title function_">push</span>(items.<span class="hljs-property">subscribe</span>);
<span class="hljs-keyword">return</span> <span class="hljs-variable language_">this</span>;
};</pre></div></div>
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<h4 id="rawasset-prototype">RawAsset prototype</h4>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> P = <span class="hljs-title class_">RawAsset</span>.<span class="hljs-property"><span class="hljs-keyword">prototype</span></span> = <span class="hljs-title class_">Object</span>.<span class="hljs-title function_">create</span>(<span class="hljs-title class_">Object</span>.<span class="hljs-property"><span class="hljs-keyword">prototype</span></span>);
P.<span class="hljs-property">type</span> = <span class="hljs-string">'RawAsset'</span>;
P.<span class="hljs-property">lib</span> = <span class="hljs-string">'asset'</span>;
P.<span class="hljs-property">isArtefact</span> = <span class="hljs-literal">false</span>;
P.<span class="hljs-property">isAsset</span> = <span class="hljs-literal">true</span>;</pre></div></div>
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<h4 id="mixins">Mixins</h4>
</div>
<div class="content"><div class='highlight'><pre>P = <span class="hljs-title function_">baseMix</span>(P);
P = <span class="hljs-title function_">assetMix</span>(P);</pre></div></div>
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<h4 id="rawasset-attributes">RawAsset attributes</h4>
<ul>
<li>Attributes defined in the <a href="../mixin/base.html">base mixin</a>: <strong>name</strong>.</li>
<li>Attributes defined in the <a href="../mixin/asset.html">asset mixin</a>: <strong>source, subscribers</strong>.</li>
<li>The <strong>element</strong> and <strong>engine</strong> attributes are excluded from the defaults object</li>
</ul>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> defaultAttributes = {</pre></div></div>
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<p><strong>keytypes</strong> - a Javascript object made up of <code>key:String</code> attributes. Used as part of the factory when generating assets which use user-defined attributes that need to be Scrawl-canvas Quaternions, Vectors (like gravity) or Coordinates.</p>
<ul>
<li>the <code>key</code> should be the attribute’s name</li>
<li>the <code>value</code> should be a String - either <code>'Quaternion'</code>, <code>'Vector'</code> or <code>'Coordinate'</code>.</li>
</ul>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-attr">keytypes</span>: <span class="hljs-literal">null</span>,</pre></div></div>
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<p><strong>data</strong> - can be anything which needs to be processed and then applied to the canvas to create a source image for Picture entitys, Pattern styles, or filters.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-attr">data</span>: <span class="hljs-literal">null</span>,</pre></div></div>
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<p><strong>updateSource</strong> - a user-defined function which will be run every time a subscriber invokes checkSource when the <code>dirtyData</code> flag is set to true</p>
<ul>
<li>At a minimum, the function will need to set the canvas element’s dimensions (<strong>width</strong> and <strong>height</strong>, both Numbers) and make an effort to draw something onto the canvas element</li>
</ul>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-attr">updateSource</span>: <span class="hljs-literal">null</span>,
};
P.<span class="hljs-property">defs</span> = <span class="hljs-title function_">mergeOver</span>(P.<span class="hljs-property">defs</span>, defaultAttributes);</pre></div></div>
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<h4 id="packet-management">Packet management</h4>
<p>Assets do not take part in the packet or clone systems; they can, however, be used for importing and actioning packets as they retain those base functions</p>
</div>
<div class="content"><div class='highlight'><pre>P.<span class="hljs-property">saveAsPacket</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) {
<span class="hljs-keyword">return</span> [<span class="hljs-variable language_">this</span>.<span class="hljs-property">name</span>, <span class="hljs-variable language_">this</span>.<span class="hljs-property">type</span>, <span class="hljs-variable language_">this</span>.<span class="hljs-property">lib</span>, {}];
};
P.<span class="hljs-property">stringifyFunction</span> = λ<span class="hljs-literal">null</span>;
P.<span class="hljs-property">processPacketOut</span> = λ<span class="hljs-literal">null</span>;
P.<span class="hljs-property">finalizePacketOut</span> = λ<span class="hljs-literal">null</span>;</pre></div></div>
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<h4 id="clone-management">Clone management</h4>
</div>
<div class="content"><div class='highlight'><pre>P.<span class="hljs-property">clone</span> = λ<span class="hljs-variable language_">this</span>;</pre></div></div>
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<h4 id="kill-management">Kill management</h4>
<p>No additional kill functionality required</p>
</div>
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<h4 id="get-set-deltaset">Get, Set, deltaSet</h4>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> G = P.<span class="hljs-property">getters</span>,
S = P.<span class="hljs-property">setters</span>,
D = P.<span class="hljs-property">deltaSetters</span>;</pre></div></div>
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<p><strong>source, engine</strong></p>
</div>
<div class="content"><div class='highlight'><pre>S.<span class="hljs-property">source</span> = λ<span class="hljs-literal">null</span>;
S.<span class="hljs-property">element</span> = λ<span class="hljs-literal">null</span>;
S.<span class="hljs-property">engine</span> = λ<span class="hljs-literal">null</span>;
S.<span class="hljs-property">data</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) {
<span class="hljs-keyword">if</span> (item) {
<span class="hljs-variable language_">this</span>.<span class="hljs-property">data</span> = item;
<span class="hljs-variable language_">this</span>.<span class="hljs-property">dirtyData</span> = <span class="hljs-literal">true</span>;
}
};
S.<span class="hljs-property">updateSource</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) {
<span class="hljs-keyword">if</span> (item && <span class="hljs-title function_">isa_fn</span>(item)) {
<span class="hljs-variable language_">this</span>.<span class="hljs-property">updateSource</span> = item;
<span class="hljs-variable language_">this</span>.<span class="hljs-property">dirtyData</span> = <span class="hljs-literal">true</span>;
}
};</pre></div></div>
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<h4 id="prototype-functions">Prototype functions</h4>
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<p><code>checkSource</code></p>
<ul>
<li>Gets invoked by subscribers (who have a handle to the asset instance object) as part of the display cycle.</li>
</ul>
</div>
<div class="content"><div class='highlight'><pre>P.<span class="hljs-property">checkSource</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">width, height</span>) {
<span class="hljs-keyword">if</span> (!<span class="hljs-variable language_">this</span>.<span class="hljs-property">source</span>) <span class="hljs-variable language_">this</span>.<span class="hljs-property">source</span> = <span class="hljs-variable language_">this</span>.<span class="hljs-property">element</span>;
<span class="hljs-keyword">let</span> source = <span class="hljs-variable language_">this</span>.<span class="hljs-property">source</span>;
<span class="hljs-keyword">if</span> (source) {
<span class="hljs-keyword">let</span> notify = <span class="hljs-literal">false</span>;
<span class="hljs-keyword">if</span> (<span class="hljs-variable language_">this</span>.<span class="hljs-property">dirtyData</span>) {
<span class="hljs-variable language_">this</span>.<span class="hljs-property">dirtyData</span> = <span class="hljs-literal">false</span>;
<span class="hljs-variable language_">this</span>.<span class="hljs-title function_">updateSource</span>(<span class="hljs-variable language_">this</span>);
notify = <span class="hljs-literal">true</span>;
}
<span class="hljs-variable language_">this</span>.<span class="hljs-property">sourceLoaded</span> = <span class="hljs-literal">true</span>;
<span class="hljs-keyword">if</span> (!<span class="hljs-variable language_">this</span>.<span class="hljs-property">sourceNaturalWidth</span> || !<span class="hljs-variable language_">this</span>.<span class="hljs-property">sourceNaturalHeight</span> || <span class="hljs-variable language_">this</span>.<span class="hljs-property">sourceNaturalWidth</span> !== width || <span class="hljs-variable language_">this</span>.<span class="hljs-property">sourceNaturalHeight</span> !== height) {
<span class="hljs-variable language_">this</span>.<span class="hljs-property">sourceNaturalWidth</span> = source.<span class="hljs-property">width</span>;
<span class="hljs-variable language_">this</span>.<span class="hljs-property">sourceNaturalHeight</span> = source.<span class="hljs-property">height</span>;
notify = <span class="hljs-literal">true</span>;
}
<span class="hljs-keyword">if</span> (notify && <span class="hljs-variable language_">this</span>.<span class="hljs-property">sourceNaturalWidth</span> && <span class="hljs-variable language_">this</span>.<span class="hljs-property">sourceNaturalHeight</span>) <span class="hljs-variable language_">this</span>.<span class="hljs-title function_">notifySubscribers</span>();
}
<span class="hljs-keyword">else</span> <span class="hljs-variable language_">this</span>.<span class="hljs-property">sourceLoaded</span> = <span class="hljs-literal">false</span>;
};</pre></div></div>
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<li id="section-18">
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<p><code>subscribeAction</code> - Overrides mixin/asset.js function</p>
</div>
<div class="content"><div class='highlight'><pre>P.<span class="hljs-property">subscribeAction</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">sub = {}</span>) {
<span class="hljs-variable language_">this</span>.<span class="hljs-property">subscribers</span>.<span class="hljs-title function_">push</span>(sub);
sub.<span class="hljs-property">asset</span> = <span class="hljs-variable language_">this</span>;
sub.<span class="hljs-property">source</span> = <span class="hljs-variable language_">this</span>.<span class="hljs-property">element</span>;
<span class="hljs-variable language_">this</span>.<span class="hljs-title function_">notifySubscriber</span>(sub)
};</pre></div></div>
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<li id="section-19">
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<p><code>addAttribute</code>, <code>removeAttribute</code> - we can use these functions to add and remove other attributes to the RawAsset object.</p>
</div>
<div class="content"><div class='highlight'><pre>P.<span class="hljs-property">addAttribute</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">items = Ωempty</span>) {
<span class="hljs-keyword">let</span> {key, defaultValue, setter, deltaSetter, getter} = items;
<span class="hljs-keyword">if</span> (key && key.<span class="hljs-property">substring</span>) {
<span class="hljs-variable language_">this</span>.<span class="hljs-property">defs</span>[key] = <span class="hljs-title function_">xt</span>(defaultValue) ? defaultValue : <span class="hljs-literal">null</span>;
<span class="hljs-variable language_">this</span>[key] = <span class="hljs-title function_">xt</span>(defaultValue) ? defaultValue : <span class="hljs-literal">null</span>;
<span class="hljs-keyword">if</span> (<span class="hljs-title function_">isa_fn</span>(setter)) S[key] = setter;
<span class="hljs-keyword">if</span> (<span class="hljs-title function_">isa_fn</span>(deltaSetter)) D[key] = deltaSetter;
<span class="hljs-keyword">if</span> (<span class="hljs-title function_">isa_fn</span>(getter)) G[key] = getter;
}
<span class="hljs-keyword">return</span> <span class="hljs-variable language_">this</span>;
};
P.<span class="hljs-property">removeAttribute</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">key</span>) {
<span class="hljs-keyword">if</span> (key && key.<span class="hljs-property">substring</span>) {
<span class="hljs-keyword">delete</span> <span class="hljs-variable language_">this</span>.<span class="hljs-property">defs</span>[key];
<span class="hljs-keyword">delete</span> <span class="hljs-variable language_">this</span>[key];
<span class="hljs-keyword">delete</span> G[key];
<span class="hljs-keyword">delete</span> S[key];
<span class="hljs-keyword">delete</span> D[key];
}
<span class="hljs-keyword">return</span> <span class="hljs-variable language_">this</span>;
};</pre></div></div>
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<li id="section-20">
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<p><code>initializeAttributes</code> - internal function called by the constructor.</p>
</div>
<div class="content"><div class='highlight'><pre>P.<span class="hljs-property">initializeAttributes</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">types</span>) {
<span class="hljs-keyword">for</span> (<span class="hljs-keyword">let</span> [key, value] <span class="hljs-keyword">of</span> <span class="hljs-title class_">Object</span>.<span class="hljs-title function_">entries</span>(types)) {
<span class="hljs-keyword">switch</span> (value) {
<span class="hljs-keyword">case</span> <span class="hljs-string">'Quaternion'</span> :
<span class="hljs-variable language_">this</span>[key] = <span class="hljs-title function_">makeQuaternion</span>();
<span class="hljs-keyword">break</span>;
<span class="hljs-keyword">case</span> <span class="hljs-string">'Vector'</span> :
<span class="hljs-variable language_">this</span>[key] = <span class="hljs-title function_">makeVector</span>();
<span class="hljs-keyword">break</span>;
<span class="hljs-keyword">case</span> <span class="hljs-string">'Coordinate'</span> :
<span class="hljs-variable language_">this</span>[key] = <span class="hljs-title function_">makeCoordinate</span>();
<span class="hljs-keyword">break</span>;
}
}
};</pre></div></div>
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<h4 id="factory">Factory</h4>
<pre><code>
</code></pre>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> makeRawAsset = <span class="hljs-keyword">function</span> (<span class="hljs-params">items</span>) {
<span class="hljs-keyword">if</span> (!items) <span class="hljs-keyword">return</span> <span class="hljs-literal">false</span>;
<span class="hljs-keyword">return</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">RawAsset</span>(items);
};
constructors.<span class="hljs-property">RawAsset</span> = <span class="hljs-title class_">RawAsset</span>;</pre></div></div>
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<h4 id="exports">Exports</h4>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">export</span> {
makeRawAsset,
};</pre></div></div>
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