scrawl-canvas
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Version 8.9.4 - 19 Nov 2022
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<h1 id="demo-snippets-006">Demo Snippets 006</h1>
<p>Editable header text colorizer and animation effect snippets</p>
<p>Related files:</p>
<ul>
<li><a href="../snippets-006.html">Editable header text colorizer and animation effect snippets</a></li>
<li><a href="./text-snippet-helper.html">Text snippet helper</a></li>
</ul>
<h3 id="horizontally-striped-text-with-swirl-animation-snippet">‘Horizontally striped text with swirl animation’ snippet</h3>
<p><strong>Purpose:</strong> Paints the text with a striped gradient pattern, and adds a swirl effect when the user moves their browser’s cursor over the text</p>
<ul>
<li>This snippet supports dark-mode alternative colors</li>
<li>This snippet does not support high contrast alternative colors</li>
<li>This snippet supports an animation effect which can be disabled in an accessible manner</li>
</ul>
<p><strong>Function input:</strong> </p>
<ul>
<li>the DOM element - generally a block or inline-block element.</li>
</ul>
<p><strong>Customisation:</strong> The snippet can be customised using the following data- attributes applied using CSS variables, or directly to the HTML header element:</p>
<ul>
<li><code>data-main-color</code> - any CSS color string</li>
<li><code>data-dark-main-color</code> - any CSS color string</li>
<li><code>data-stripe-color</code> - any CSS color string</li>
<li><code>data-dark-stripe-color</code> - any CSS color string</li>
<li><code>data-stripe-ratio</code> - (0 - 1) the ratio of stripe to main color; higher values show wider stripes</li>
<li><code>data-swirl-angle</code> - (degrees) higher values lead to a tighter swirl; use negative values to reverse the swirl direction</li>
<li><code>data-gradient-skew-x</code> - (-2 - 2) skew the gradient pattern horizontally</li>
<li><code>data-gradient-skew-y</code> - (-2 - 2) skew the gradient pattern vertically</li>
<li><code>data-gradient-stretch-x</code> - (0 - 4) stretch the gradient pattern horizontally</li>
<li><code>data-gradient-stretch-y</code> - (0 - 4) stretch the gradient pattern vertically</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> * <span class="hljs-keyword">as</span> scrawl <span class="hljs-keyword">from</span> <span class="hljs-string">'path/to/scrawl-canvas/library'</span>;
<span class="hljs-keyword">import</span> mySnippet <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_">mySnippet</span>(el, scrawl));
</code></pre>
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<p>Additional font-specific customisation can be added courtesy of the Text Snippet Helper module</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">import</span> { getSnippetData } <span class="hljs-keyword">from</span> <span class="hljs-string">'./text-snippet-helper.js'</span>;</pre></div></div>
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<p><strong>Effects on the element:</strong> </p>
<ul>
<li>Imports the element’s background color, and sets the element background to <code>transparent</code></li>
<li>Imports the element’s text node text, and sets the text color to <code>transparent</code></li>
<li><em><strong>Note that canvas text will NEVER be as good as DOM text!</strong></em></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, scrawl</span>) {</pre></div></div>
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<p>Apply the snippet to the DOM element</p>
</div>
<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,
});</pre></div></div>
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<p>Only proceed if the snippet is successfully generated</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">if</span> (snippet) {</pre></div></div>
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<p>Import data and functionality from the Text Snippet Helper module</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">let</span> { canvas, group, animation, compStyles, dataset, name, height, lineHeight, initCanvas, initPhrase, textGroup, responsiveFunctions, colorSchemeDarkActions, colorSchemeLightActions, animationFunctions, animationEndFunctions, additionalDemolishActions } = <span class="hljs-title function_">getSnippetData</span>(snippet, scrawl);</pre></div></div>
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<p>Initialise the canvas</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-title function_">initCanvas</span>();</pre></div></div>
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<p>Initialize and collect developer-supplied data</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">let</span> mainColor = <span class="hljs-string">'black'</span>,
darkMainColor = <span class="hljs-string">'white'</span>,
stripeColor = <span class="hljs-string">'red'</span>,
darkStripeColor = <span class="hljs-string">'#e34e49'</span>,
stripeRatio = <span class="hljs-number">0.5</span>,
swirlAngle = <span class="hljs-number">90</span>,
gradientSkewX = <span class="hljs-number">0</span>,
gradientSkewY = <span class="hljs-number">0</span>,
gradientStretchX = <span class="hljs-number">1</span>,
gradientStretchY = <span class="hljs-number">1</span>;
<span class="hljs-keyword">if</span> (dataset.<span class="hljs-property">mainColor</span>) mainColor = dataset.<span class="hljs-property">mainColor</span>;
<span class="hljs-keyword">else</span> {
<span class="hljs-keyword">const</span> s = compStyles.<span class="hljs-title function_">getPropertyValue</span>(<span class="hljs-string">'--data-main-color'</span>);
<span class="hljs-keyword">if</span> (s) mainColor = s;
}
<span class="hljs-keyword">if</span> (dataset.<span class="hljs-property">darkMainColor</span>) darkMainColor = dataset.<span class="hljs-property">darkMainColor</span>;
<span class="hljs-keyword">else</span> {
<span class="hljs-keyword">const</span> s = compStyles.<span class="hljs-title function_">getPropertyValue</span>(<span class="hljs-string">'--data-main-color'</span>);
<span class="hljs-keyword">if</span> (s) darkMainColor = s;
}
<span class="hljs-keyword">if</span> (dataset.<span class="hljs-property">stripeColor</span>) stripeColor = dataset.<span class="hljs-property">stripeColor</span>;
<span class="hljs-keyword">else</span> {
<span class="hljs-keyword">const</span> s = compStyles.<span class="hljs-title function_">getPropertyValue</span>(<span class="hljs-string">'--data-stripe-color'</span>);
<span class="hljs-keyword">if</span> (s) stripeColor = s;
}
<span class="hljs-keyword">if</span> (dataset.<span class="hljs-property">darkStripeColor</span>) darkStripeColor = dataset.<span class="hljs-property">darkStripeColor</span>;
<span class="hljs-keyword">else</span> {
<span class="hljs-keyword">const</span> s = compStyles.<span class="hljs-title function_">getPropertyValue</span>(<span class="hljs-string">'--data-stripe-color'</span>);
<span class="hljs-keyword">if</span> (s) darkStripeColor = s;
}
<span class="hljs-keyword">if</span> (dataset.<span class="hljs-property">stripeRatio</span>) stripeRatio = <span class="hljs-built_in">parseFloat</span>(dataset.<span class="hljs-property">stripeRatio</span>);
<span class="hljs-keyword">else</span> {
<span class="hljs-keyword">const</span> s = compStyles.<span class="hljs-title function_">getPropertyValue</span>(<span class="hljs-string">'--data-gradient-easing'</span>);
<span class="hljs-keyword">if</span> (s) stripeRatio = <span class="hljs-built_in">parseFloat</span>(s);
}
<span class="hljs-keyword">if</span> (dataset.<span class="hljs-property">swirlAngle</span>) swirlAngle = <span class="hljs-built_in">parseFloat</span>(dataset.<span class="hljs-property">swirlAngle</span>);
<span class="hljs-keyword">else</span> {
<span class="hljs-keyword">const</span> s = compStyles.<span class="hljs-title function_">getPropertyValue</span>(<span class="hljs-string">'--data-swirl-angle'</span>);
<span class="hljs-keyword">if</span> (s) swirlAngle = <span class="hljs-built_in">parseFloat</span>(s);
}
<span class="hljs-keyword">if</span> (dataset.<span class="hljs-property">gradientSkewX</span>) gradientSkewX = <span class="hljs-built_in">parseFloat</span>(dataset.<span class="hljs-property">gradientSkewX</span>);
<span class="hljs-keyword">else</span> {
<span class="hljs-keyword">const</span> s = compStyles.<span class="hljs-title function_">getPropertyValue</span>(<span class="hljs-string">'--data-gradient-skew-x'</span>);
<span class="hljs-keyword">if</span> (s) gradientSkewX = <span class="hljs-built_in">parseFloat</span>(s);
}
<span class="hljs-keyword">if</span> (dataset.<span class="hljs-property">gradientSkewY</span>) gradientSkewY = <span class="hljs-built_in">parseFloat</span>(dataset.<span class="hljs-property">gradientSkewY</span>);
<span class="hljs-keyword">else</span> {
<span class="hljs-keyword">const</span> s = compStyles.<span class="hljs-title function_">getPropertyValue</span>(<span class="hljs-string">'--data-gradient-skew-y'</span>);
<span class="hljs-keyword">if</span> (s) gradientSkewY = <span class="hljs-built_in">parseFloat</span>(s);
}
<span class="hljs-keyword">if</span> (dataset.<span class="hljs-property">gradientStretchX</span>) gradientStretchX = <span class="hljs-built_in">parseFloat</span>(dataset.<span class="hljs-property">gradientStretchX</span>);
<span class="hljs-keyword">else</span> {
<span class="hljs-keyword">const</span> s = compStyles.<span class="hljs-title function_">getPropertyValue</span>(<span class="hljs-string">'--data-gradient-stretch-x'</span>);
<span class="hljs-keyword">if</span> (s) gradientStretchX = <span class="hljs-built_in">parseFloat</span>(s);
}
<span class="hljs-keyword">if</span> (dataset.<span class="hljs-property">gradientStretchY</span>) gradientStretchY = <span class="hljs-built_in">parseFloat</span>(dataset.<span class="hljs-property">gradientStretchY</span>);
<span class="hljs-keyword">else</span> {
<span class="hljs-keyword">const</span> s = compStyles.<span class="hljs-title function_">getPropertyValue</span>(<span class="hljs-string">'--data-gradient-stretch-y'</span>);
<span class="hljs-keyword">if</span> (s) gradientStretchY = <span class="hljs-built_in">parseFloat</span>(s);
}</pre></div></div>
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<p>Build the text effect</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">let</span> gradientChangeAt = <span class="hljs-title class_">Math</span>.<span class="hljs-title function_">floor</span>(stripeRatio * <span class="hljs-number">1000</span>);
<span class="hljs-keyword">if</span> (gradientChangeAt < <span class="hljs-number">1</span>) gradientChangeAt = <span class="hljs-number">1</span>;
<span class="hljs-keyword">if</span> (gradientChangeAt > <span class="hljs-number">997</span>) gradientChangeAt = <span class="hljs-number">997</span>;
<span class="hljs-keyword">const</span> myGradient = scrawl.<span class="hljs-title function_">makeGradient</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">`<span class="hljs-subst">${name}</span>-swirlstripe-gradient`</span>,
<span class="hljs-attr">colors</span>: [
[<span class="hljs-number">0</span>, stripeColor],
[gradientChangeAt, stripeColor],
[gradientChangeAt + <span class="hljs-number">1</span>, mainColor],
[<span class="hljs-number">999</span>, mainColor],
],
<span class="hljs-attr">endY</span>: <span class="hljs-string">'100%'</span>,
<span class="hljs-attr">precision</span>: <span class="hljs-number">10</span>,
});
<span class="hljs-keyword">const</span> cell = canvas.<span class="hljs-title function_">buildCell</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">`<span class="hljs-subst">${name}</span>-swirlstripe-gradient-cell`</span>,
<span class="hljs-attr">width</span>: <span class="hljs-number">16</span>,
<span class="hljs-attr">height</span>: lineHeight,
<span class="hljs-attr">shown</span>: <span class="hljs-literal">false</span>,
<span class="hljs-attr">useAsPattern</span>: <span class="hljs-literal">true</span>,
});
scrawl.<span class="hljs-title function_">makeBlock</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">`<span class="hljs-subst">${name}</span>-swirlstripe-gradient-block-0`</span>,
<span class="hljs-attr">group</span>: <span class="hljs-string">`<span class="hljs-subst">${name}</span>-swirlstripe-gradient-cell`</span>,
<span class="hljs-attr">dimensions</span>: [<span class="hljs-string">'100%'</span>, <span class="hljs-string">'20%'</span>],
<span class="hljs-attr">fillStyle</span>: <span class="hljs-string">`<span class="hljs-subst">${name}</span>-swirlstripe-gradient`</span>,
<span class="hljs-attr">lockFillStyleToEntity</span>: <span class="hljs-literal">true</span>,
}).<span class="hljs-title function_">clone</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">`<span class="hljs-subst">${name}</span>-swirlstripe-gradient-block-1`</span>,
<span class="hljs-attr">startY</span>: <span class="hljs-string">'20%'</span>,
}).<span class="hljs-title function_">clone</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">`<span class="hljs-subst">${name}</span>-swirlstripe-gradient-block-2`</span>,
<span class="hljs-attr">startY</span>: <span class="hljs-string">'40%'</span>,
}).<span class="hljs-title function_">clone</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">`<span class="hljs-subst">${name}</span>-swirlstripe-gradient-block-3`</span>,
<span class="hljs-attr">startY</span>: <span class="hljs-string">'60%'</span>,
}).<span class="hljs-title function_">clone</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">`<span class="hljs-subst">${name}</span>-swirlstripe-gradient-block-4`</span>,
<span class="hljs-attr">startY</span>: <span class="hljs-string">'80%'</span>,
});
<span class="hljs-keyword">const</span> p1 = scrawl.<span class="hljs-title function_">makePattern</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">`<span class="hljs-subst">${name}</span>-swirlstripe-gradient-pattern`</span>,
<span class="hljs-attr">asset</span>: <span class="hljs-string">`<span class="hljs-subst">${name}</span>-swirlstripe-gradient-cell`</span>,
<span class="hljs-attr">stretchX</span>: gradientStretchY,
<span class="hljs-attr">stretchY</span>: gradientStretchX,
<span class="hljs-attr">skewX</span>: gradientSkewY,
<span class="hljs-attr">skewY</span>: gradientSkewX,
});
<span class="hljs-keyword">const</span> textFill = scrawl.<span class="hljs-title function_">makePhrase</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">`<span class="hljs-subst">${name}</span>-text-stencil`</span>,
group,
<span class="hljs-attr">order</span>: <span class="hljs-number">0</span>,
});
<span class="hljs-title function_">initPhrase</span>(textFill);
textGroup.<span class="hljs-title function_">addArtefacts</span>(textFill);
scrawl.<span class="hljs-title function_">makeBlock</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">`<span class="hljs-subst">${name}</span>-text-fill`</span>,
group,
<span class="hljs-attr">order</span>: <span class="hljs-number">1</span>,
<span class="hljs-attr">width</span>: <span class="hljs-string">'100%'</span>,
<span class="hljs-attr">height</span>: <span class="hljs-string">'100%'</span>,
<span class="hljs-attr">fillStyle</span>: <span class="hljs-string">`<span class="hljs-subst">${name}</span>-swirlstripe-gradient-pattern`</span>,
<span class="hljs-attr">globalCompositeOperation</span>: <span class="hljs-string">'source-in'</span>,
});
<span class="hljs-keyword">const</span> swirl = scrawl.<span class="hljs-title function_">makeFilter</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">`<span class="hljs-subst">${name}</span>-swirl-filter`</span>,
<span class="hljs-attr">method</span>: <span class="hljs-string">'swirl'</span>,
<span class="hljs-attr">startX</span>: <span class="hljs-string">'50%'</span>,
<span class="hljs-attr">startY</span>: <span class="hljs-string">'50%'</span>,
<span class="hljs-attr">innerRadius</span>: <span class="hljs-number">0</span>,
<span class="hljs-attr">outerRadius</span>: <span class="hljs-title class_">Math</span>.<span class="hljs-title function_">ceil</span>(lineHeight * <span class="hljs-number">2</span>),
<span class="hljs-attr">easing</span>: <span class="hljs-string">'easeOutIn'</span>,
<span class="hljs-attr">angle</span>: swirlAngle,
<span class="hljs-attr">transparentEdges</span>: <span class="hljs-literal">true</span>,
});
canvas.<span class="hljs-property">base</span>.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">compileOrder</span>: <span class="hljs-number">1</span>,
<span class="hljs-attr">memoizeFilterOutput</span>: <span class="hljs-literal">true</span>,
});</pre></div></div>
</li>
<li id="section-10">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-10">§</a>
</div>
<p>Accessibility</p>
</div>
<div class="content"><div class='highlight'><pre> colorSchemeLightActions.<span class="hljs-title function_">push</span>(<span class="hljs-function">() =></span> {
myGradient.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">colors</span>: [
[<span class="hljs-number">0</span>, stripeColor],
[gradientChangeAt, stripeColor],
[gradientChangeAt + <span class="hljs-number">1</span>, mainColor],
[<span class="hljs-number">999</span>, mainColor],
],
});
});
colorSchemeDarkActions.<span class="hljs-title function_">push</span>(<span class="hljs-function">() =></span> {
myGradient.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">colors</span>: [
[<span class="hljs-number">0</span>, darkStripeColor],
[gradientChangeAt, darkStripeColor],
[gradientChangeAt + <span class="hljs-number">1</span>, darkMainColor],
[<span class="hljs-number">999</span>, darkMainColor],
],
});
});</pre></div></div>
</li>
<li id="section-11">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-11">§</a>
</div>
<p>Responsiveness</p>
</div>
<div class="content"><div class='highlight'><pre> responsiveFunctions.<span class="hljs-title function_">push</span>(<span class="hljs-function">(<span class="hljs-params">items = {}</span>) =></span> {
<span class="hljs-keyword">const</span> localLineHeight = <span class="hljs-built_in">parseFloat</span>(items.<span class="hljs-property">lineHeight</span>);
cell.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">height</span>: localLineHeight,
});
swirl.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">outerRadius</span>: <span class="hljs-title class_">Math</span>.<span class="hljs-title function_">ceil</span>(localLineHeight * <span class="hljs-number">2</span>),
});
});</pre></div></div>
</li>
<li id="section-12">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-12">§</a>
</div>
<p>Additional animation functionality</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">let</span> isActive = <span class="hljs-literal">false</span>;
animationFunctions.<span class="hljs-title function_">push</span>(<span class="hljs-function">() =></span> {
<span class="hljs-keyword">const</span> {x, y, active} = canvas.<span class="hljs-property">here</span>;
<span class="hljs-keyword">if</span> (active && !isActive) {
isActive = <span class="hljs-literal">true</span>;
canvas.<span class="hljs-property">base</span>.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">filters</span>: [swirl.<span class="hljs-property">name</span>],
});
}
<span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (!active && isActive) {
isActive = <span class="hljs-literal">false</span>;
canvas.<span class="hljs-property">base</span>.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">filters</span>: [],
});
}
<span class="hljs-keyword">if</span> (isActive) {
swirl.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">startX</span>: x,
<span class="hljs-attr">startY</span>: y,
});
}
});
animationEndFunctions.<span class="hljs-title function_">push</span>(<span class="hljs-function">() =></span> {
canvas.<span class="hljs-property">base</span>.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">filters</span>: [],
});
});</pre></div></div>
</li>
<li id="section-13">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-13">§</a>
</div>
<p>Cleanup</p>
</div>
<div class="content"><div class='highlight'><pre> additionalDemolishActions.<span class="hljs-title function_">push</span>(<span class="hljs-function">() =></span> {
myGradient.<span class="hljs-title function_">kill</span>();
p1.<span class="hljs-title function_">kill</span>();
swirl.<span class="hljs-title function_">kill</span>();
cell.<span class="hljs-title function_">kill</span>();
});
}</pre></div></div>
</li>
<li id="section-14">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-14">§</a>
</div>
<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>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">return</span> snippet;
};</pre></div></div>
</li>
</ul>
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