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="animated-bubbles-effect-used-to-color-text-snippet">‘Animated bubbles effect used to color text’ snippet</h3>
<p><strong>Purpose:</strong> Displays text with an animation of rising bubbles over the text fill</p>
<ul>
<li>This snippet supports dark-mode alternative colors</li>
<li>This snippet supports 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-text-color</code> - any CSS color string</li>
<li><code>data-dark-text-color</code> - any CSS color string</li>
<li><code>data-outline-color</code> - any CSS color string</li>
<li><code>data-dark-outline-color</code> - any CSS color string</li>
<li><code>data-outline-width</code> - (unit % of font size) percentage of the font size for text outline width</li>
<li><code>data-bubble-color</code> - any CSS color string</li>
<li><code>data-dark-bubble-color</code> - any CSS color string</li>
<li><code>data-bubble-outline-color</code> - any CSS color string</li>
<li><code>data-dark-bubble-outline-color</code> - any CSS color string</li>
<li><code>data-bubble-density</code> - the number of bubbles to generate</li>
<li><code>data-contrast-color</code> - any CSS color string, used when user has set <code>prefers-contrast: more</code></li>
<li><code>data-dark-contrast-color</code> - any CSS color string, used when user has set <code>prefers-contrast: more</code></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, dataset, compStyles, name, yOffset, fontSize, lineHeight, initCanvas, initPhrase, textGroup, eternalTweens, responsiveFunctions, contrastMoreActions, contrastOtherActions, colorSchemeDarkActions, colorSchemeLightActions, 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> textColor = <span class="hljs-string">'#c213bc'</span>,
darkTextColor = <span class="hljs-string">'#fcdeef'</span>,
outlineColor = <span class="hljs-string">'#f59dcf'</span>,
darkOutlineColor = <span class="hljs-string">'#f59dcf'</span>,
outlineWidth = <span class="hljs-number">0.05</span>,
bubbleColor = <span class="hljs-string">'#fcdeef'</span>,
darkBubbleColor = <span class="hljs-string">'#ed5fb0'</span>,
bubbleOutlineColor = <span class="hljs-string">'#c213bc'</span>,
darkBubbleOutlineColor = <span class="hljs-string">'#c213bc'</span>,
bubbleDensity = <span class="hljs-number">50</span>,
contrastColor = <span class="hljs-string">'black'</span>,
darkContrastColor = <span class="hljs-string">'white'</span>;
<span class="hljs-keyword">if</span> (dataset.<span class="hljs-property">textColor</span>) textColor = dataset.<span class="hljs-property">textColor</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-text-color'</span>);
<span class="hljs-keyword">if</span> (s) textColor = s;
}
<span class="hljs-keyword">if</span> (dataset.<span class="hljs-property">darkTextColor</span>) darkTextColor = dataset.<span class="hljs-property">darkTextColor</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-dark-text-color'</span>);
<span class="hljs-keyword">if</span> (s) darkTextColor = s;
}
<span class="hljs-keyword">if</span> (dataset.<span class="hljs-property">outlineColor</span>) outlineColor = dataset.<span class="hljs-property">outlineColor</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-outline-color'</span>);
<span class="hljs-keyword">if</span> (s) outlineColor = s;
}
<span class="hljs-keyword">if</span> (dataset.<span class="hljs-property">darkOutlineColor</span>) darkOutlineColor = dataset.<span class="hljs-property">darkOutlineColor</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-dark-outline-color'</span>);
<span class="hljs-keyword">if</span> (s) darkOutlineColor = s;
}
<span class="hljs-keyword">if</span> (dataset.<span class="hljs-property">outlineWidth</span>) outlineWidth = <span class="hljs-built_in">parseFloat</span>(dataset.<span class="hljs-property">outlineWidth</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-outline-width'</span>);
<span class="hljs-keyword">if</span> (s) outlineWidth = <span class="hljs-built_in">parseFloat</span>(s);
}
<span class="hljs-keyword">if</span> (dataset.<span class="hljs-property">bubbleColor</span>) bubbleColor = dataset.<span class="hljs-property">bubbleColor</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-bubble-color'</span>);
<span class="hljs-keyword">if</span> (s) bubbleColor = s;
}
<span class="hljs-keyword">if</span> (dataset.<span class="hljs-property">darkBubbleColor</span>) darkBubbleColor = dataset.<span class="hljs-property">darkBubbleColor</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-dark-bubble-color'</span>);
<span class="hljs-keyword">if</span> (s) darkBubbleColor = s;
}
<span class="hljs-keyword">if</span> (dataset.<span class="hljs-property">bubbleOutlineColor</span>) bubbleOutlineColor = dataset.<span class="hljs-property">bubbleOutlineColor</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-bubble-outline-color'</span>);
<span class="hljs-keyword">if</span> (s) bubbleOutlineColor = s;
}
<span class="hljs-keyword">if</span> (dataset.<span class="hljs-property">darkBubbleOutlineColor</span>) darkBubbleOutlineColor = dataset.<span class="hljs-property">darkBubbleOutlineColor</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-dark-bubble-outline-color'</span>);
<span class="hljs-keyword">if</span> (s) darkBubbleOutlineColor = s;
}
<span class="hljs-keyword">if</span> (dataset.<span class="hljs-property">bubbleDensity</span>) bubbleDensity = <span class="hljs-built_in">parseFloat</span>(dataset.<span class="hljs-property">bubbleDensity</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-bubble-density'</span>);
<span class="hljs-keyword">if</span> (s) bubbleDensity = <span class="hljs-built_in">parseFloat</span>(s);
}
<span class="hljs-keyword">if</span> (dataset.<span class="hljs-property">contrastColor</span>) contrastColor = dataset.<span class="hljs-property">contrastColor</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-contrast-color'</span>);
<span class="hljs-keyword">if</span> (s) contrastColor = s;
}
<span class="hljs-keyword">if</span> (dataset.<span class="hljs-property">darkContrastColor</span>) darkContrastColor = dataset.<span class="hljs-property">darkContrastColor</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-dark-contrast-color'</span>);
<span class="hljs-keyword">if</span> (s) darkContrastColor = 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">const</span> bubblesGroup = scrawl.<span class="hljs-title function_">makeGroup</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">`<span class="hljs-subst">${name}</span>-bubbles-group`</span>,
});
<span class="hljs-keyword">const</span> fizz = scrawl.<span class="hljs-title function_">makeWheel</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">`<span class="hljs-subst">${name}</span>-bubbles-template`</span>,
group,
<span class="hljs-attr">order</span>: <span class="hljs-number">1</span>,
<span class="hljs-attr">startY</span>: <span class="hljs-string">'100%'</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">fillStyle</span>: bubbleColor,
<span class="hljs-attr">strokeStyle</span>: bubbleOutlineColor,
<span class="hljs-attr">method</span>: <span class="hljs-string">'fillThenDraw'</span>,
<span class="hljs-attr">globalCompositeOperation</span>: <span class="hljs-string">'source-atop'</span>,
<span class="hljs-attr">noDeltaUpdates</span>: <span class="hljs-literal">true</span>,
<span class="hljs-attr">noPositionDependencies</span>: <span class="hljs-literal">true</span>,
<span class="hljs-attr">noFilters</span>: <span class="hljs-literal">true</span>,
<span class="hljs-attr">noUserInteraction</span>: <span class="hljs-literal">true</span>,
<span class="hljs-attr">purge</span>: <span class="hljs-string">'all'</span>,
});
bubblesGroup.<span class="hljs-title function_">addArtefacts</span>(fizz);
<span class="hljs-keyword">for</span> (<span class="hljs-keyword">let</span> i = <span class="hljs-number">0</span>; i < bubbleDensity; i++) {
<span class="hljs-keyword">const</span> bubble = fizz.<span class="hljs-title function_">clone</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">`<span class="hljs-subst">${name}</span>-bubble-<span class="hljs-subst">${i}</span>`</span>,
<span class="hljs-attr">radius</span>: <span class="hljs-title class_">Math</span>.<span class="hljs-title function_">round</span>((<span class="hljs-title class_">Math</span>.<span class="hljs-title function_">random</span>() * (fontSize / <span class="hljs-number">2</span>)) + <span class="hljs-number">4</span>),
<span class="hljs-attr">startX</span>: <span class="hljs-string">`<span class="hljs-subst">${<span class="hljs-built_in">Math</span>.random() * <span class="hljs-number">100</span>}</span>%`</span>,
<span class="hljs-attr">noCanvasEngineUpdates</span>: <span class="hljs-literal">true</span>,
<span class="hljs-attr">sharedState</span>: <span class="hljs-literal">true</span>,
});
bubblesGroup.<span class="hljs-title function_">addArtefacts</span>(bubble);
<span class="hljs-keyword">const</span> myRandom = <span class="hljs-title class_">Math</span>.<span class="hljs-title function_">random</span>();
eternalTweens.<span class="hljs-title function_">push</span>(scrawl.<span class="hljs-title function_">makeTween</span>({
<span class="hljs-attr">name</span>: bubble.<span class="hljs-property">name</span>,
<span class="hljs-attr">targets</span>: bubble,
<span class="hljs-attr">duration</span>: <span class="hljs-title class_">Math</span>.<span class="hljs-title function_">round</span>((myRandom * <span class="hljs-number">3000</span>) + <span class="hljs-number">5000</span>),
<span class="hljs-attr">cycles</span>: <span class="hljs-number">0</span>,
<span class="hljs-attr">definitions</span>: [{
<span class="hljs-attr">attribute</span>: <span class="hljs-string">'startY'</span>,
<span class="hljs-attr">start</span>: <span class="hljs-string">'100%'</span>,
<span class="hljs-attr">end</span>: <span class="hljs-string">'0%'</span>,
}, {
<span class="hljs-attr">attribute</span>: <span class="hljs-string">'scale'</span>,
<span class="hljs-attr">start</span>: <span class="hljs-number">0.3</span>,
<span class="hljs-attr">end</span>: <span class="hljs-title class_">Math</span>.<span class="hljs-title function_">round</span>((<span class="hljs-number">1</span> - myRandom) * <span class="hljs-number">0.9</span>) + <span class="hljs-number">0.6</span>,
}],
}).<span class="hljs-title function_">run</span>());
}
<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">fillStyle</span>: textColor,
<span class="hljs-attr">underlineStyle</span>: <span class="hljs-string">'rgba(0 0 0 / 0)'</span>,
<span class="hljs-attr">method</span>: <span class="hljs-string">'fill'</span>,
<span class="hljs-attr">order</span>: <span class="hljs-number">0</span>,
});
<span class="hljs-title function_">initPhrase</span>(textFill);
<span class="hljs-keyword">const</span> textStroke = textFill.<span class="hljs-title function_">clone</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">`<span class="hljs-subst">${name}</span>-text-outline`</span>,
<span class="hljs-attr">order</span>: <span class="hljs-number">2</span>,
<span class="hljs-attr">strokeStyle</span>: outlineColor,
<span class="hljs-attr">lineWidth</span>: outlineWidth * fontSize,
<span class="hljs-attr">underlineStyle</span>: outlineColor,
<span class="hljs-attr">method</span>: <span class="hljs-string">'draw'</span>,
});
textGroup.<span class="hljs-title function_">addArtefacts</span>(textFill, textStroke);</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> {
fizz.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">fillStyle</span>: bubbleColor,
<span class="hljs-attr">strokeStyle</span>: bubbleOutlineColor,
});
textFill.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">fillStyle</span>: textColor,
});
textStroke.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">strokeStyle</span>: outlineColor,
<span class="hljs-attr">underlineStyle</span>: outlineColor,
});
});
colorSchemeDarkActions.<span class="hljs-title function_">push</span>(<span class="hljs-function">() =></span> {
fizz.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">fillStyle</span>: darkBubbleColor,
<span class="hljs-attr">strokeStyle</span>: darkBubbleOutlineColor,
});
textFill.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">fillStyle</span>: darkTextColor,
});
textStroke.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">strokeStyle</span>: darkOutlineColor,
<span class="hljs-attr">underlineStyle</span>: darkOutlineColor,
});
});
contrastMoreActions.<span class="hljs-title function_">push</span>(<span class="hljs-function">() =></span> {
el.<span class="hljs-property">style</span>.<span class="hljs-property">color</span> = (canvas.<span class="hljs-property">here</span>.<span class="hljs-property">prefersDarkColorScheme</span>) ? darkContrastColor : contrastColor;
textGroup.<span class="hljs-title function_">setArtefacts</span>({
<span class="hljs-attr">visibility</span>: <span class="hljs-literal">false</span>,
});
});
contrastOtherActions.<span class="hljs-title function_">push</span>(<span class="hljs-function">() =></span> {
el.<span class="hljs-property">style</span>.<span class="hljs-property">color</span> = <span class="hljs-string">'transparent'</span>;
textGroup.<span class="hljs-title function_">setArtefacts</span>({
<span class="hljs-attr">visibility</span>: <span class="hljs-literal">true</span>,
});
});</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> localFontSize = <span class="hljs-built_in">parseFloat</span>(items.<span class="hljs-property">fontSize</span>),
localRadius = localFontSize / <span class="hljs-number">2</span>;
textStroke.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">lineWidth</span>: outlineWidth * localFontSize,
});
bubblesGroup.<span class="hljs-title function_">setArtefacts</span>({
<span class="hljs-attr">radius</span>: <span class="hljs-title class_">Math</span>.<span class="hljs-title function_">round</span>((<span class="hljs-title class_">Math</span>.<span class="hljs-title function_">random</span>() * localRadius) + <span class="hljs-number">4</span>),
});
});</pre></div></div>
</li>
<li id="section-12">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-12">§</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> {
bubblesGroup.<span class="hljs-title function_">kill</span>();
});
}</pre></div></div>
</li>
<li id="section-13">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-13">§</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>
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