scrawl-canvas
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Version 8.9.4 - 19 Nov 2022
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<h1 id="demo-snippets-004">Demo Snippets 004</h1>
<p>Snippets included in the Scrawl-canvas demo/snippets folder</p>
<p>Related files:</p>
<ul>
<li><a href="../snippets-004.html">Snippets included in the Scrawl-canvas demo/snippets folder</a></li>
<li><a href="./animated-hover-gradient-snippet.html">Animated hover gradient snippet</a></li>
<li><a href="./animated-word-gradient-snippet.html">Animated word gradient snippet</a></li>
<li><a href="./green-box-snippet.html">Green box snippet</a></li>
<li><a href="./jazzy-button-snippet.html">Jazzy button snippet</a></li>
<li><a href="./page-performance-snippet.html">Page performance snippet</a></li>
<li><a href="./pan-image-snippet.html">Pan image snippet</a></li>
<li><a href="./placeholder-effect-snippet.html">Placeholder effect snippet</a></li>
<li><a href="./ripple-effect-snippet.html">Ripple effect snippet</a></li>
<li><a href="./spotlight-text-snippet.html">Spotlight text snippet</a></li>
<li><a href="./word-highlighter-snippet.html">Word highlighter snippet</a></li>
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<h3 id="animated-hover-gradient-snippet">‘Animated hover gradient’ snippet</h3>
<p><strong>Purpose:</strong> adds a gradient behind the words, which animates on user hover over the <span> (or similar) element.</p>
<p><strong>Function input:</strong> </p>
<ul>
<li>the DOM element - generally a block or inline-block element.</li>
</ul>
<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>
<h5 id="usage-example">Usage example:</h5>
<pre><code><span class="hljs-keyword">import</span> hoverGradient <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_">hoverGradient</span>(el));
</code></pre>
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<p>Import the Scrawl-canvas object </p>
<ul>
<li>there’s various ways to do this. See <a href="../dom-001.html">Demo DOM-001</a> for more details</li>
</ul>
</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>;</pre></div></div>
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<p><strong>Effects on the element:</strong> </p>
<ul>
<li>no additional effects on the DOM element</li>
<li>setting any background fill on the DOM element will hide the snippet canvas, unless it is deliberately brought forward</li>
</ul>
</div>
<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, args = {}</span>) {</pre></div></div>
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<p>Apply the snippet to the DOM element</p>
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<div class="content"><div class='highlight'><pre> <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) {</pre></div></div>
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<p>Set some convenience variables</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">let</span> canvas = snippet.<span class="hljs-property">canvas</span>,
group = canvas.<span class="hljs-property">base</span>.<span class="hljs-property">name</span>,
animation = snippet.<span class="hljs-property">animation</span>,
wrapper = snippet.<span class="hljs-property">element</span>,
name = wrapper.<span class="hljs-property">name</span>;
<span class="hljs-keyword">const</span> animatedGradient = scrawl.<span class="hljs-title function_">makeRadialGradient</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">`<span class="hljs-subst">${name}</span>-gradient`</span>,
<span class="hljs-attr">start</span>: [<span class="hljs-number">0</span>, <span class="hljs-number">0</span>],
<span class="hljs-attr">end</span>: [<span class="hljs-number">0</span>, <span class="hljs-number">0</span>],
<span class="hljs-attr">endRadius</span>: <span class="hljs-string">'120%'</span>,
<span class="hljs-attr">paletteStart</span>: <span class="hljs-number">0</span>,
<span class="hljs-attr">paletteEnd</span>: <span class="hljs-number">99</span>,
<span class="hljs-attr">delta</span>: {
<span class="hljs-attr">paletteStart</span>: -<span class="hljs-number">3</span>,
<span class="hljs-attr">paletteEnd</span>: -<span class="hljs-number">3</span>,
},
<span class="hljs-attr">cyclePalette</span>: <span class="hljs-literal">true</span>,
})
.<span class="hljs-title function_">updateColor</span>(<span class="hljs-number">0</span>, <span class="hljs-string">'orange'</span>)
.<span class="hljs-title function_">updateColor</span>(<span class="hljs-number">99</span>, <span class="hljs-string">'orange'</span>)
.<span class="hljs-title function_">updateColor</span>(<span class="hljs-number">100</span>, <span class="hljs-string">'red'</span>)
.<span class="hljs-title function_">updateColor</span>(<span class="hljs-number">299</span>, <span class="hljs-string">'red'</span>)
.<span class="hljs-title function_">updateColor</span>(<span class="hljs-number">300</span>, <span class="hljs-string">'lightblue'</span>)
.<span class="hljs-title function_">updateColor</span>(<span class="hljs-number">499</span>, <span class="hljs-string">'lightblue'</span>)
.<span class="hljs-title function_">updateColor</span>(<span class="hljs-number">500</span>, <span class="hljs-string">'gold'</span>)
.<span class="hljs-title function_">updateColor</span>(<span class="hljs-number">699</span>, <span class="hljs-string">'gold'</span>)
.<span class="hljs-title function_">updateColor</span>(<span class="hljs-number">700</span>, <span class="hljs-string">'green'</span>)
.<span class="hljs-title function_">updateColor</span>(<span class="hljs-number">899</span>, <span class="hljs-string">'green'</span>)
.<span class="hljs-title function_">updateColor</span>(<span class="hljs-number">900</span>, <span class="hljs-string">'orange'</span>)
.<span class="hljs-title function_">updateColor</span>(<span class="hljs-number">999</span>, <span class="hljs-string">'orange'</span>);
scrawl.<span class="hljs-title function_">makeBlock</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">`<span class="hljs-subst">${name}</span>-block`</span>,
group,
<span class="hljs-attr">dimensions</span>: [<span class="hljs-string">'100%'</span>, <span class="hljs-string">'100%'</span>],
<span class="hljs-attr">fillStyle</span>: <span class="hljs-string">`<span class="hljs-subst">${name}</span>-gradient`</span>,
<span class="hljs-attr">method</span>: <span class="hljs-string">'fill'</span>,
});
animation.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">commence</span>: <span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) {
<span class="hljs-keyword">if</span> (canvas.<span class="hljs-property">here</span>.<span class="hljs-property">active</span>) animatedGradient.<span class="hljs-title function_">updateByDelta</span>();
},
});
}</pre></div></div>
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<p>Return the snippet, so coders can access the snippet’s parts - in case they need to tweak the output to meet the web page’s specific requirements</p>
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<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">return</span> snippet;
};</pre></div></div>
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