scrawl-canvas
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Version 8.9.4 - 19 Nov 2022
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<h1 id="demo-snippets-002">Demo Snippets 002</h1>
<p>Scrawl-canvas stack element snippets</p>
<p>Related files:</p>
<ul>
<li><a href="../snippets-002.html">Stack element snippets - main module</a></li>
</ul>
<h3 id="green-box-snippet">‘Green box’ snippet</h3>
<p><strong>Purpose:</strong> adds a translucent green box to an element.</p>
<p><strong>Function input:</strong> the DOM element, or a handle to it, as the only argument.</p>
<p><strong>Function output:</strong> a Javascript object will be returned, containing the following attributes</p>
<pre><code>{
element <span class="hljs-comment">// the Scrawl-canvas wrapper for the DOM element supplied to the function</span>
canvas <span class="hljs-comment">// the Scrawl-canvas wrapper for the snippet's canvas</span>
animation <span class="hljs-comment">// the Scrawl-canvas animation object</span>
demolish <span class="hljs-comment">// remove the snippet from the Scrawl-canvas library</span>
}
</code></pre>
<p><strong>Usage example:</strong></p>
<pre><code><span class="hljs-keyword">import</span> greenBox <span class="hljs-keyword">from</span> <span class="hljs-string">'./relative/or/absolute/path/to/this/file.js'</span>;
<span class="hljs-keyword">let</span> myElements = <span class="hljs-variable language_">document</span>.<span class="hljs-title function_">querySelectorAll</span>(<span class="hljs-string">'.some-class'</span>);
myElements.<span class="hljs-title function_">forEach</span>(<span class="hljs-function"><span class="hljs-params">el</span> =></span> <span class="hljs-title function_">greenBox</span>(el));
</code></pre>
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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> * <span class="hljs-keyword">as</span> scrawl <span class="hljs-keyword">from</span> <span class="hljs-string">'../../source/scrawl.js'</span></pre></div></div>
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<p><strong>Effects on the element:</strong> </p>
<ul>
<li>Adds a green box to the background display</li>
</ul>
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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">el</span>) {
<span class="hljs-keyword">let</span> snippet = scrawl.<span class="hljs-title function_">makeSnippet</span>({
<span class="hljs-attr">domElement</span>: el,
});
<span class="hljs-keyword">if</span> (snippet) {
scrawl.<span class="hljs-title function_">makeBlock</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">`<span class="hljs-subst">${snippet.element.name}</span>-box`</span>,
<span class="hljs-attr">group</span>: snippet.<span class="hljs-property">canvas</span>.<span class="hljs-property">base</span>.<span class="hljs-property">name</span>,
<span class="hljs-attr">width</span>: <span class="hljs-string">'50%'</span>,
<span class="hljs-attr">height</span>: <span class="hljs-string">'50%'</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">globalAlpha</span>: <span class="hljs-number">0.3</span>,
<span class="hljs-attr">strokeStyle</span>: <span class="hljs-string">'lightgreen'</span>,
<span class="hljs-attr">lineWidth</span>: <span class="hljs-number">40</span>,
<span class="hljs-attr">method</span>: <span class="hljs-string">'draw'</span>,
});
}
<span class="hljs-keyword">return</span> snippet;
};</pre></div></div>
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