scrawl-canvas
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<h1 id="pattern-mixin">Pattern mixin</h1>
<p>Most of the code relating to the <a href="https://developer.mozilla.org/en-US/docs/Web/API/CanvasPattern">CanvasPattern API</a> can be found here.</p>
<ul>
<li>To create a pattern from an image asset, use the <a href="../factory/pattern.html">Pattern factory</a>.</li>
<li>We can also use a Scrawl-canvas <a href="../factory/cell.html">Cell</a> as the asset for a pattern.</li>
<li>In both cases, we assign the pattern to an entity’s <code>fillStyle</code> or <code>strokeStyle</code> attribute by supplying the Pattern object or Cell wrapper’s String name to it.</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> { mergeOver, isa_number, Ωempty } <span class="hljs-keyword">from</span> <span class="hljs-string">'../core/utilities.js'</span>;
<span class="hljs-keyword">import</span> { cell } <span class="hljs-keyword">from</span> <span class="hljs-string">'../core/library.js'</span>;</pre></div></div>
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<h4 id="export-function">Export function</h4>
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<div class="content"><div class='highlight'><pre><span class="hljs-keyword">export</span> <span class="hljs-keyword">default</span> <span class="hljs-keyword">function</span> (<span class="hljs-params">P = Ωempty</span>) {</pre></div></div>
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<h4 id="shared-attributes">Shared attributes</h4>
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<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">let</span> defaultAttributes = {</pre></div></div>
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<p><strong>repeat</strong> - String indicating how to repeat the pattern’s image. Possible values are: <code>repeat</code> (default), <code>repeat-x</code>, <code>repeat-y</code>, <code>no-repeat</code></p>
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<div class="content"><div class='highlight'><pre> <span class="hljs-attr">repeat</span>: <span class="hljs-string">'repeat'</span>,</pre></div></div>
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<p><strong>patternMatrix</strong> - Scrawl-canvas will apply a 2d-style, 6 value <a href="https://developer.mozilla.org/en-US/docs/Web/API/DOMMatrix">DOMMatrix</a> to the pattern each time it is recreated. Changing the values of the matrix will change the rotation, skew, etc of the pattern. Pseudo-attributes can be used to set individual elements of the matrix, as follows:</p>
<ul>
<li><code>stretchX</code> (or <code>matrixA</code>) - generally used for horizontal (x axis) scale</li>
<li><code>skewY</code> (or <code>matrixB</code>) - generally used for horizontal (x axis) skew</li>
<li><code>skewX</code> (or <code>matrixC</code>) - generally used for vertical (y axis) skew</li>
<li><code>stretchY</code> (or <code>matrixD</code>) - generally used for vertical (y axis) scale</li>
<li><code>shiftX</code> (or <code>matrixE</code>) - generally used for horizontal (x axis) positioning</li>
<li><code>shiftY</code> (or <code>matrixF</code>) - generally used for vertical (y axis) positioning</li>
</ul>
<p>To rotate the pattern, update the B and C matrix values in tandem. Results will be dependent on the surrounding matrix values. See demo <a href="../../demo/canvas-035.html">Canvas-035</a> to explore further.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-attr">patternMatrix</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>No additional packet functionality defined here</p>
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<h4 id="clone-management">Clone management</h4>
<p>No additional clone functionality defined here</p>
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<h4 id="kill-management">Kill management</h4>
<p>No additional kill functionality defined here</p>
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<h4 id="get-set-deltaset">Get, Set, deltaSet</h4>
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<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">let</span> S = P.<span class="hljs-property">setters</span>;</pre></div></div>
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<p><strong>repeat</strong></p>
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<div class="content"><div class='highlight'><pre> P.<span class="hljs-property">repeatValues</span> = [<span class="hljs-string">'repeat'</span>, <span class="hljs-string">'repeat-x'</span>, <span class="hljs-string">'repeat-y'</span>, <span class="hljs-string">'no-repeat'</span>];
S.<span class="hljs-property">repeat</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) {
<span class="hljs-keyword">if</span> (<span class="hljs-variable language_">this</span>.<span class="hljs-property">repeatValues</span>.<span class="hljs-title function_">indexOf</span>(item) >= <span class="hljs-number">0</span>) <span class="hljs-variable language_">this</span>.<span class="hljs-property">repeat</span> = item;
<span class="hljs-keyword">else</span> <span class="hljs-variable language_">this</span>.<span class="hljs-property">repeat</span> = <span class="hljs-variable language_">this</span>.<span class="hljs-property">defs</span>.<span class="hljs-property">repeat</span>;
};</pre></div></div>
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<p><code>updateMatrixNumber</code> - internal helper function</p>
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<div class="content"><div class='highlight'><pre> P.<span class="hljs-property">matrixNumberPosCheck</span> = [<span class="hljs-string">'a'</span>, <span class="hljs-string">'b'</span>, <span class="hljs-string">'c'</span>, <span class="hljs-string">'d'</span>, <span class="hljs-string">'e'</span>, <span class="hljs-string">'f'</span>];
P.<span class="hljs-property">updateMatrixNumber</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item, pos</span>) {
<span class="hljs-keyword">if</span> (!<span class="hljs-variable language_">this</span>.<span class="hljs-property">patternMatrix</span>) <span class="hljs-variable language_">this</span>.<span class="hljs-property">patternMatrix</span> = <span class="hljs-keyword">new</span> <span class="hljs-title class_">DOMMatrix</span>();
item = (item.<span class="hljs-property">substring</span>) ? <span class="hljs-built_in">parseFloat</span>(item) : item;
<span class="hljs-keyword">let</span> posCheck = <span class="hljs-variable language_">this</span>.<span class="hljs-property">matrixNumberPosCheck</span>.<span class="hljs-title function_">indexOf</span>(pos);
<span class="hljs-keyword">if</span> (<span class="hljs-title function_">isa_number</span>(item) && posCheck >= <span class="hljs-number">0</span>) <span class="hljs-variable language_">this</span>.<span class="hljs-property">patternMatrix</span>[pos] = item;
};</pre></div></div>
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<p><strong>matrixA</strong>, <strong>matrixB</strong>, <strong>matrixC</strong>, <strong>matrixD</strong>, <strong>matrixE</strong>, <strong>matrixF</strong> - these <em>pseudo-attributes</em> can be used to set individual attributes of the <code>patternMatrix</code> DOMMatrix object</p>
</div>
<div class="content"><div class='highlight'><pre> S.<span class="hljs-property">matrixA</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) { <span class="hljs-variable language_">this</span>.<span class="hljs-title function_">updateMatrixNumber</span>(item, <span class="hljs-string">'a'</span>); };
S.<span class="hljs-property">matrixB</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) { <span class="hljs-variable language_">this</span>.<span class="hljs-title function_">updateMatrixNumber</span>(item, <span class="hljs-string">'b'</span>); };
S.<span class="hljs-property">matrixC</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) { <span class="hljs-variable language_">this</span>.<span class="hljs-title function_">updateMatrixNumber</span>(item, <span class="hljs-string">'c'</span>); };
S.<span class="hljs-property">matrixD</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) { <span class="hljs-variable language_">this</span>.<span class="hljs-title function_">updateMatrixNumber</span>(item, <span class="hljs-string">'d'</span>); };
S.<span class="hljs-property">matrixE</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) { <span class="hljs-variable language_">this</span>.<span class="hljs-title function_">updateMatrixNumber</span>(item, <span class="hljs-string">'e'</span>); };
S.<span class="hljs-property">matrixF</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) { <span class="hljs-variable language_">this</span>.<span class="hljs-title function_">updateMatrixNumber</span>(item, <span class="hljs-string">'f'</span>); };</pre></div></div>
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<p><strong>stretchX</strong>, <strong>skewY</strong>, <strong>skewX</strong>, <strong>stretchY</strong>, <strong>shiftX</strong>, <strong>shiftY</strong> - these <em>pseudo-attributes</em> can be used to set individual attributes of the <code>patternMatrix</code> DOMMatrix object</p>
</div>
<div class="content"><div class='highlight'><pre> S.<span class="hljs-property">stretchX</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) { <span class="hljs-variable language_">this</span>.<span class="hljs-title function_">updateMatrixNumber</span>(item, <span class="hljs-string">'a'</span>); };
S.<span class="hljs-property">skewY</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) { <span class="hljs-variable language_">this</span>.<span class="hljs-title function_">updateMatrixNumber</span>(item, <span class="hljs-string">'b'</span>); };
S.<span class="hljs-property">skewX</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) { <span class="hljs-variable language_">this</span>.<span class="hljs-title function_">updateMatrixNumber</span>(item, <span class="hljs-string">'c'</span>); };
S.<span class="hljs-property">stretchY</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) { <span class="hljs-variable language_">this</span>.<span class="hljs-title function_">updateMatrixNumber</span>(item, <span class="hljs-string">'d'</span>); };
S.<span class="hljs-property">shiftX</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) { <span class="hljs-variable language_">this</span>.<span class="hljs-title function_">updateMatrixNumber</span>(item, <span class="hljs-string">'e'</span>); };
S.<span class="hljs-property">shiftY</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) { <span class="hljs-variable language_">this</span>.<span class="hljs-title function_">updateMatrixNumber</span>(item, <span class="hljs-string">'f'</span>); };</pre></div></div>
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<p><strong>patternMatrix</strong> - the argument must be an Array containing 6 Number elements in the form of <code>[a, b, c, d, e, f]</code></p>
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<div class="content"><div class='highlight'><pre> S.<span class="hljs-property">patternMatrix</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) {
<span class="hljs-keyword">if</span> (<span class="hljs-title class_">Array</span>.<span class="hljs-title function_">isArray</span>(item)) {
<span class="hljs-keyword">let</span> update = <span class="hljs-variable language_">this</span>.<span class="hljs-property">updateMatrixNumber</span>;
<span class="hljs-title function_">update</span>(item[<span class="hljs-number">0</span>], <span class="hljs-string">'a'</span>);
<span class="hljs-title function_">update</span>(item[<span class="hljs-number">1</span>], <span class="hljs-string">'b'</span>);
<span class="hljs-title function_">update</span>(item[<span class="hljs-number">2</span>], <span class="hljs-string">'c'</span>);
<span class="hljs-title function_">update</span>(item[<span class="hljs-number">3</span>], <span class="hljs-string">'d'</span>);
<span class="hljs-title function_">update</span>(item[<span class="hljs-number">4</span>], <span class="hljs-string">'e'</span>);
<span class="hljs-title function_">update</span>(item[<span class="hljs-number">5</span>], <span class="hljs-string">'f'</span>);
}
};</pre></div></div>
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<h4 id="prototype-functions">Prototype functions</h4>
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<p><code>buildStyle</code> - internal function: creates the pattern on the Cell’s CanvasRenderingContext2D engine.</p>
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<div class="content"><div class='highlight'><pre> P.<span class="hljs-property">buildStyle</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">mycell</span>) {
<span class="hljs-keyword">if</span> (mycell) {
<span class="hljs-keyword">if</span> (mycell.<span class="hljs-property">substring</span>) mycell = cell[mycell];
<span class="hljs-keyword">let</span> source = <span class="hljs-variable language_">this</span>.<span class="hljs-property">source</span>,
loaded = <span class="hljs-variable language_">this</span>.<span class="hljs-property">sourceLoaded</span>,
repeat = <span class="hljs-variable language_">this</span>.<span class="hljs-property">repeat</span>,
engine = mycell.<span class="hljs-property">engine</span>;
<span class="hljs-keyword">if</span> (<span class="hljs-variable language_">this</span>.<span class="hljs-property">type</span> === <span class="hljs-string">'Cell'</span> || <span class="hljs-variable language_">this</span>.<span class="hljs-property">type</span> === <span class="hljs-string">'Noise'</span>) {
source = <span class="hljs-variable language_">this</span>.<span class="hljs-property">element</span>;
loaded = <span class="hljs-literal">true</span>;
}
<span class="hljs-keyword">if</span> (engine && loaded) {
<span class="hljs-keyword">let</span> p = engine.<span class="hljs-title function_">createPattern</span>(source, repeat);
p.<span class="hljs-title function_">setTransform</span>(<span class="hljs-variable language_">this</span>.<span class="hljs-property">patternMatrix</span>);
<span class="hljs-keyword">return</span> p;
}
}
<span class="hljs-keyword">return</span> <span class="hljs-string">'rgba(0,0,0,0)'</span>;
};</pre></div></div>
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<li id="section-18">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-18">§</a>
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<p>Return the prototype</p>
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<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">return</span> P;
};</pre></div></div>
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