scrawl-canvas
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<h1 id="pattern-factory">Pattern factory</h1>
<p>Scrawl-canvas Pattern objects implement the Canvas API’s <a href="https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/createPattern">createPattern</a> method. The resulting <a href="https://developer.mozilla.org/en-US/docs/Web/API/CanvasPattern">CanvasPattern</a> object can be used by any Scrawl-canvas entity as its <code>fillStyle</code> or <code>strokeStyle</code>.</p>
<ul>
<li>Most pattern-related functionality has been coded up in the <a href="../mixin/styles.html">styles mixin</a>, and is documented there.</li>
<li>Functionality associated with <strong>assets</strong>, which Patterns use as their source, has been coded up in the <a href="../mixin/assetConsumer.html">assetConsumer mixin</a>.</li>
<li>Patterns fully participate in the Scrawl-canvas packet system, thus can be saved, restored, cloned, killed, etc.</li>
<li>Patterns cannot be animated as such, but a Cell wrapper that is used as the Pattern’s source can be animated in any of the normal ways.</li>
<li>Scrawl-canvas does not support the Canvas API <code>CanvasPattern.setTransform()</code> method - it appears to be based on the SVGMatrix interface, which was deprecated in the SVG2 standard.</li>
</ul>
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<h4 id="demos">Demos:</h4>
<ul>
<li><a href="../../demo/canvas-009.html">Canvas-009</a> - Pattern styles; Entity web link anchors; Dynamic accessibility</li>
<li><a href="../../demo/canvas-035.html">Canvas-035</a> - Pattern style functionality</li>
</ul>
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<h4 id="imports">Imports</h4>
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<div class="content"><div class='highlight'><pre><span class="hljs-keyword">import</span> { constructors, cell, entity } <span class="hljs-keyword">from</span> <span class="hljs-string">'../core/library.js'</span>;
<span class="hljs-keyword">import</span> { mergeOver, pushUnique, isa_obj, Ωempty } <span class="hljs-keyword">from</span> <span class="hljs-string">'../core/utilities.js'</span>;
<span class="hljs-keyword">import</span> { stateKeys } <span class="hljs-keyword">from</span> <span class="hljs-string">'./state.js'</span>;
<span class="hljs-keyword">import</span> { gettableVideoAssetAtributes, settableVideoAssetAtributes } <span class="hljs-keyword">from</span> <span class="hljs-string">'./videoAsset.js'</span>;
<span class="hljs-keyword">import</span> { gettableImageAssetAtributes, settableImageAssetAtributes } <span class="hljs-keyword">from</span> <span class="hljs-string">'./imageAsset.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> patternMix <span class="hljs-keyword">from</span> <span class="hljs-string">'../mixin/pattern.js'</span>;
<span class="hljs-keyword">import</span> assetConsumerMix <span class="hljs-keyword">from</span> <span class="hljs-string">'../mixin/assetConsumer.js'</span>;</pre></div></div>
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<h4 id="pattern-constructor">Pattern constructor</h4>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> <span class="hljs-title class_">Pattern</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-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-title function_">set</span>(items);
<span class="hljs-keyword">return</span> <span class="hljs-variable language_">this</span>;
};</pre></div></div>
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<h4 id="pattern-prototype">Pattern prototype</h4>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> P = <span class="hljs-title class_">Pattern</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">'Pattern'</span>;
P.<span class="hljs-property">lib</span> = <span class="hljs-string">'styles'</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">false</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_">patternMix</span>(P);
P = <span class="hljs-title function_">assetConsumerMix</span>(P);</pre></div></div>
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<h4 id="pattern-attributes">Pattern 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/pattern.html">pattern mixin</a>: <strong>repeat, patternMatrix, matrixA, matrixB, matrixC, matrixD, matrixE, matrixF</strong>.</li>
<li>Attributes defined in the <a href="../mixin/assetConsumer.html">assetConsumer mixin</a>: <strong>asset, spriteTrack, imageSource, spriteSource, videoSource, source</strong>.</li>
</ul>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> defaultAttributes = {};
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>
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<div class="content"><div class='highlight'><pre>P.<span class="hljs-property">packetObjects</span> = <span class="hljs-title function_">pushUnique</span>(P.<span class="hljs-property">packetObjects</span>, [<span class="hljs-string">'asset'</span>]);
P.<span class="hljs-property">finalizePacketOut</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">copy, items</span>) {
<span class="hljs-keyword">if</span> (<span class="hljs-title class_">Array</span>.<span class="hljs-title function_">isArray</span>(items.<span class="hljs-property">patternMatrix</span>)) copy.<span class="hljs-property">patternMatrix</span> = items.<span class="hljs-property">patternMatrix</span>;
<span class="hljs-keyword">else</span> {
<span class="hljs-keyword">let</span> m = <span class="hljs-variable language_">this</span>.<span class="hljs-property">patternMatrix</span>;
<span class="hljs-keyword">if</span> (m) copy.<span class="hljs-property">patternMatrix</span> = [m.<span class="hljs-property">a</span>, m.<span class="hljs-property">b</span>, m.<span class="hljs-property">c</span>, m.<span class="hljs-property">d</span>, m.<span class="hljs-property">e</span>, m.<span class="hljs-property">f</span>];
}
<span class="hljs-keyword">return</span> copy;
};</pre></div></div>
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<h4 id="clone-management">Clone management</h4>
<p>No additional clone functionality required</p>
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<h4 id="kill-management">Kill management</h4>
</div>
<div class="content"><div class='highlight'><pre>P.<span class="hljs-property">kill</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) {
<span class="hljs-keyword">let</span> { name, asset, removeAssetOnKill } = <span class="hljs-variable language_">this</span>;
<span class="hljs-keyword">if</span> (<span class="hljs-title function_">isa_obj</span>(asset)) asset.<span class="hljs-title function_">unsubscribe</span>(<span class="hljs-variable language_">this</span>);</pre></div></div>
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<p>Remove style from all entity state objects</p>
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<div class="content"><div class='highlight'><pre> <span class="hljs-title class_">Object</span>.<span class="hljs-title function_">entries</span>(entity).<span class="hljs-title function_">forEach</span>(<span class="hljs-function">(<span class="hljs-params">[label, ent]</span>) =></span> {
<span class="hljs-keyword">let</span> state = ent.<span class="hljs-property">state</span>;
<span class="hljs-keyword">if</span> (state) {
<span class="hljs-keyword">let</span> fill = state.<span class="hljs-property">fillStyle</span>,
stroke = state.<span class="hljs-property">strokeStyle</span>;
<span class="hljs-keyword">if</span> (<span class="hljs-title function_">isa_obj</span>(fill) && fill.<span class="hljs-property">name</span> === name) state.<span class="hljs-property">fillStyle</span> = state.<span class="hljs-property">defs</span>.<span class="hljs-property">fillStyle</span>;
<span class="hljs-keyword">if</span> (<span class="hljs-title function_">isa_obj</span>(stroke) && stroke.<span class="hljs-property">name</span> === name) state.<span class="hljs-property">strokeStyle</span> = state.<span class="hljs-property">defs</span>.<span class="hljs-property">strokeStyle</span>;
}
});</pre></div></div>
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<p>Cascade kill invocation to the asset object, if required</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">if</span> (removeAssetOnKill) {
<span class="hljs-keyword">if</span> (removeAssetOnKill.<span class="hljs-property">substring</span>) asset.<span class="hljs-title function_">kill</span>(<span class="hljs-literal">true</span>);
<span class="hljs-keyword">else</span> asset.<span class="hljs-title function_">kill</span>();
}</pre></div></div>
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<p>Remove style from the Scrawl-canvas library</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-variable language_">this</span>.<span class="hljs-title function_">deregister</span>();
<span class="hljs-keyword">return</span> <span class="hljs-variable language_">this</span>;
};</pre></div></div>
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<h4 id="get-set-deltaset">Get, Set, deltaSet</h4>
<p>Pattern <code>get</code> and <code>set</code> (but not <code>deltaSet</code>) functions need to take into account their current source, whose attributes can be retrieved/amended directly on the Picture object</p>
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<p><code>get</code></p>
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<div class="content"><div class='highlight'><pre>P.<span class="hljs-property">get</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</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> ((item.<span class="hljs-title function_">indexOf</span>(<span class="hljs-string">'video_'</span>) === <span class="hljs-number">0</span> || item.<span class="hljs-title function_">indexOf</span>(<span class="hljs-string">'image_'</span>) === <span class="hljs-number">0</span>) && source) {
<span class="hljs-keyword">if</span> (gettableVideoAssetAtributes.<span class="hljs-title function_">indexOf</span>(item) >= <span class="hljs-number">0</span>) <span class="hljs-keyword">return</span> source[item.<span class="hljs-title function_">substring</span>(<span class="hljs-number">6</span>)];
<span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (gettableImageAssetAtributes.<span class="hljs-title function_">indexOf</span>(item) >= <span class="hljs-number">0</span>) <span class="hljs-keyword">return</span> source[item.<span class="hljs-title function_">substring</span>(<span class="hljs-number">6</span>)];
}
<span class="hljs-keyword">else</span> {
<span class="hljs-keyword">let</span> getter = <span class="hljs-variable language_">this</span>.<span class="hljs-property">getters</span>[item];
<span class="hljs-keyword">if</span> (getter) <span class="hljs-keyword">return</span> getter.<span class="hljs-title function_">call</span>(<span class="hljs-variable language_">this</span>);
<span class="hljs-keyword">else</span> {
<span class="hljs-keyword">let</span> def = <span class="hljs-variable language_">this</span>.<span class="hljs-property">defs</span>[item],
val;
<span class="hljs-keyword">if</span> (<span class="hljs-keyword">typeof</span> def != <span class="hljs-string">'undefined'</span>) {
val = <span class="hljs-variable language_">this</span>[item];
<span class="hljs-keyword">return</span> (<span class="hljs-keyword">typeof</span> val != <span class="hljs-string">'undefined'</span>) ? val : def;
}
<span class="hljs-keyword">return</span> undef;
}
}
};</pre></div></div>
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<p><code>set</code></p>
</div>
<div class="content"><div class='highlight'><pre>P.<span class="hljs-property">set</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">items = Ωempty</span>) {
<span class="hljs-keyword">const</span> keys = <span class="hljs-title class_">Object</span>.<span class="hljs-title function_">keys</span>(items),
keysLen = keys.<span class="hljs-property">length</span>;
<span class="hljs-keyword">if</span> (keysLen) {
<span class="hljs-keyword">const</span> setters = <span class="hljs-variable language_">this</span>.<span class="hljs-property">setters</span>,
source = <span class="hljs-variable language_">this</span>.<span class="hljs-property">source</span>,
defs = <span class="hljs-variable language_">this</span>.<span class="hljs-property">defs</span>;
<span class="hljs-keyword">let</span> predefined, i, key, value;
<span class="hljs-keyword">for</span> (i = <span class="hljs-number">0</span>; i < keysLen; i++) {
key = keys[i];
value = items[key];
<span class="hljs-keyword">if</span> ((key.<span class="hljs-title function_">indexOf</span>(<span class="hljs-string">'video_'</span>) === <span class="hljs-number">0</span> || key.<span class="hljs-title function_">indexOf</span>(<span class="hljs-string">'image_'</span>) === <span class="hljs-number">0</span>) && source) {
<span class="hljs-keyword">if</span> (settableVideoAssetAtributes.<span class="hljs-title function_">indexOf</span>(key) >= <span class="hljs-number">0</span>) source[key.<span class="hljs-title function_">substring</span>(<span class="hljs-number">6</span>)] = value
<span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (settableImageAssetAtributes.<span class="hljs-title function_">indexOf</span>(key) >= <span class="hljs-number">0</span>) source[key.<span class="hljs-title function_">substring</span>(<span class="hljs-number">6</span>)] = value
}
<span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (key && key !== <span class="hljs-string">'name'</span> && value != <span class="hljs-literal">null</span>) {
predefined = setters[key];
<span class="hljs-keyword">if</span> (predefined) predefined.<span class="hljs-title function_">call</span>(<span class="hljs-variable language_">this</span>, value);
<span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (<span class="hljs-keyword">typeof</span> defs[key] !== <span class="hljs-string">'undefined'</span>) <span class="hljs-variable language_">this</span>[key] = value;
}
}
<span class="hljs-variable language_">this</span>.<span class="hljs-property">dirtyFilterIdentifier</span> = <span class="hljs-literal">true</span>;
}
<span class="hljs-keyword">return</span> <span class="hljs-variable language_">this</span>;
};</pre></div></div>
</li>
<li id="section-17">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-17">§</a>
</div>
<h4 id="prototype-functions">Prototype functions</h4>
</div>
</li>
<li id="section-18">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-18">§</a>
</div>
<p><code>getData</code> function called by Cell objects when calculating required updates to its CanvasRenderingContext2D engine, specifically for an entity’s <strong>fillStyle</strong>, <strong>strokeStyle</strong> and <strong>shadowColor</strong> attributes.</p>
<ul>
<li>This is the point when we clean Scrawl-canvas assets which have told their subscribers that asset data/attributes have updated</li>
</ul>
</div>
<div class="content"><div class='highlight'><pre>P.<span class="hljs-property">getData</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">entity, cell</span>) {
<span class="hljs-keyword">if</span> (<span class="hljs-variable language_">this</span>.<span class="hljs-property">dirtyAsset</span>) <span class="hljs-variable language_">this</span>.<span class="hljs-title function_">cleanAsset</span>();
<span class="hljs-variable language_">this</span>.<span class="hljs-property">asset</span>.<span class="hljs-title function_">checkSource</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-keyword">return</span> <span class="hljs-variable language_">this</span>.<span class="hljs-title function_">buildStyle</span>(cell);
};</pre></div></div>
</li>
<li id="section-19">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-19">§</a>
</div>
<h4 id="factory">Factory</h4>
<pre><code>scrawl.<span class="hljs-title function_">importDomImage</span>(<span class="hljs-string">'.mypatterns'</span>);
scrawl.<span class="hljs-title function_">makePattern</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">'brick-pattern'</span>,
<span class="hljs-attr">asset</span>: <span class="hljs-string">'brick'</span>,
}).<span class="hljs-title function_">clone</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">'marble-pattern'</span>,
<span class="hljs-attr">imageSource</span>: <span class="hljs-string">'img/marble.png'</span>,
});
scrawl.<span class="hljs-title function_">makeBlock</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">'marble-block'</span>,
<span class="hljs-attr">width</span>: <span class="hljs-string">'40%'</span>,
<span class="hljs-attr">height</span>: <span class="hljs-string">'40%'</span>,
<span class="hljs-attr">startX</span>: <span class="hljs-string">'25%'</span>,
<span class="hljs-attr">startY</span>: <span class="hljs-string">'25%'</span>,
<span class="hljs-attr">handleX</span>: <span class="hljs-string">'center'</span>,
<span class="hljs-attr">handleY</span>: <span class="hljs-string">'center'</span>,
<span class="hljs-attr">lineWidth</span>: <span class="hljs-number">20</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>,
<span class="hljs-attr">fillStyle</span>: <span class="hljs-string">'marble-pattern'</span>,
<span class="hljs-attr">strokeStyle</span>: <span class="hljs-string">'brick-pattern'</span>,
});
</code></pre>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> makePattern = <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_">Pattern</span>(items);
};
constructors.<span class="hljs-property">Pattern</span> = <span class="hljs-title class_">Pattern</span>;</pre></div></div>
</li>
<li id="section-20">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-20">§</a>
</div>
<h4 id="exports">Exports</h4>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">export</span> {
makePattern,
};</pre></div></div>
</li>
</ul>
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