scrawl-canvas
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Version 8.9.4 - 19 Nov 2022
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<ul class="sections">
<li id="section-1">
<div class="annotation">
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<a class="ss" href="#section-1">§</a>
</div>
<h1 id="demo-dom-007">Demo DOM 007</h1>
<p>Animate a DOM element using the delta attribute object; dynamically change classes on a DOM element</p>
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<li id="section-2">
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<p><a href="../../demo/dom-007.html">Run code</a></p>
</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>
<span class="hljs-keyword">import</span> { reportSpeed } <span class="hljs-keyword">from</span> <span class="hljs-string">'./utilities.js'</span>;</pre></div></div>
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</div>
<h4 id="scene-setup">Scene setup</h4>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> artefact = scrawl.<span class="hljs-property">library</span>.<span class="hljs-property">artefact</span>,
stack = artefact.<span class="hljs-property">mystack</span>,
flower = artefact.<span class="hljs-property">flower</span>,
currentClass = <span class="hljs-string">''</span>;</pre></div></div>
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<p>Create a new Group for the box elements, against which we will be checking for hits</p>
<ul>
<li>the box elements have been imported already and assigned to the Stack’s default group, but we can move them to the new Group using <code>.set()</code></li>
</ul>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> hitgroup = scrawl.<span class="hljs-title function_">makeGroup</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">'hitareas'</span>,
<span class="hljs-attr">host</span>: <span class="hljs-string">'mystack'</span>,
});</pre></div></div>
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<li id="section-5">
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<p>Update the Stack</p>
</div>
<div class="content"><div class='highlight'><pre>stack.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">width</span>: <span class="hljs-number">600</span>,
<span class="hljs-attr">height</span>: <span class="hljs-number">400</span>,</pre></div></div>
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<p>This gets the browser to add a drag icon to the stack element’s lower right corner, which in turn allows the user to drag-resize the element in real time.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-attr">css</span>: {
<span class="hljs-attr">overflow</span>: <span class="hljs-string">'hidden'</span>,
<span class="hljs-attr">resize</span>: <span class="hljs-string">'both'</span>
},</pre></div></div>
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<p>Switch on automated element resize capture and processing</p>
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<div class="content"><div class='highlight'><pre> <span class="hljs-attr">checkForResize</span>: <span class="hljs-literal">true</span>,
});</pre></div></div>
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<p>Update the boxes</p>
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<div class="content"><div class='highlight'><pre>artefact.<span class="hljs-property">rightbox</span>.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">group</span>: <span class="hljs-string">'hitareas'</span>,
<span class="hljs-attr">startX</span>: <span class="hljs-string">'55%'</span>,
<span class="hljs-attr">startY</span>: <span class="hljs-string">'15%'</span>,
<span class="hljs-attr">roll</span>: <span class="hljs-number">10</span>,
<span class="hljs-attr">css</span>: { <span class="hljs-attr">backgroundColor</span>: <span class="hljs-string">'red'</span> },
});
artefact.<span class="hljs-property">leftbox</span>.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">group</span>: hitgroup.<span class="hljs-property">name</span>,
<span class="hljs-attr">startX</span>: <span class="hljs-string">'10%'</span>,
<span class="hljs-attr">startY</span>: <span class="hljs-string">'35%'</span>,
<span class="hljs-attr">css</span>: { <span class="hljs-attr">backgroundColor</span>: <span class="hljs-string">'blue'</span> },
});</pre></div></div>
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<p>Batch-update the box artefacts using their shared Group</p>
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<div class="content"><div class='highlight'><pre>hitgroup.<span class="hljs-title function_">setArtefacts</span>({
<span class="hljs-attr">width</span>: <span class="hljs-string">'25%'</span>,
<span class="hljs-attr">height</span>: <span class="hljs-string">'50%'</span>,
<span class="hljs-attr">css</span>: { <span class="hljs-attr">opacity</span>: <span class="hljs-string">'0.4'</span> },
});</pre></div></div>
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<p>Update the flower wheel</p>
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<div class="content"><div class='highlight'><pre>flower.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">width</span>: <span class="hljs-number">200</span>,
<span class="hljs-attr">height</span>: <span class="hljs-number">200</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">handleX</span>: <span class="hljs-string">'center'</span>,
<span class="hljs-attr">handleY</span>: <span class="hljs-string">'center'</span>,
<span class="hljs-attr">classes</span>: <span class="hljs-string">'make_round'</span>,
<span class="hljs-attr">delta</span>: {
<span class="hljs-attr">startX</span>: <span class="hljs-string">'0.4%'</span>,
<span class="hljs-attr">startY</span>: <span class="hljs-string">'-0.3%'</span>,
<span class="hljs-attr">roll</span>: <span class="hljs-number">0.5</span>,
},</pre></div></div>
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<p>We will check for <strong>boundary collisions</strong> using Scrawl-canvas delta checking functionality</p>
<ul>
<li>We supply an array for each delta attribute we want to check in the deltaConstraints Object</li>
<li>The Array holds three items: <code>[minimum-value, maximum-value, action-to-take]</code></li>
<li>When the attribute updated by the delta value falls outside our boundaries, Scrawl-canvas takes the appropriate action</li>
<li>The <strong>reverse</strong> action will reverse the numerical sign of the affected delta object attribute value</li>
<li>The <strong>loop</strong> action will loop the artefact’s attribute value from the maximum to the minimum value, or vice-versa as appropriate</li>
</ul>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-attr">deltaConstraints</span>: {
<span class="hljs-attr">startX</span>: [<span class="hljs-string">'10%'</span>, <span class="hljs-string">'90%'</span>, <span class="hljs-string">'reverse'</span>],
<span class="hljs-attr">startY</span>: [<span class="hljs-string">'10%'</span>, <span class="hljs-string">'90%'</span>, <span class="hljs-string">'reverse'</span>],
},
<span class="hljs-attr">checkDeltaConstraints</span>: <span class="hljs-literal">true</span>,
});</pre></div></div>
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<h4 id="scene-animation">Scene animation</h4>
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<p>Updating the flower’s DOM element’s class attribute</p>
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<div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> checkForFlowerClassUpdates = <span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) {</pre></div></div>
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<p>@ts-expect-error</p>
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<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">let</span> current = hitgroup.<span class="hljs-title function_">getArtefactAt</span>([flower.<span class="hljs-title function_">get</span>(<span class="hljs-string">'start'</span>)]).<span class="hljs-property">artefact</span>;
<span class="hljs-keyword">if</span> (current && !currentClass) {
currentClass = (current.<span class="hljs-property">name</span> === <span class="hljs-string">'leftbox'</span>) ? <span class="hljs-string">'make_blue'</span> : <span class="hljs-string">'make_red'</span>;
flower.<span class="hljs-title function_">addClasses</span>(currentClass);
}
<span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (!current && currentClass) {
flower.<span class="hljs-title function_">removeClasses</span>(currentClass);
currentClass = <span class="hljs-string">''</span>;
}
};</pre></div></div>
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<p>Function to display frames-per-second data, and other information relevant to the demo</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> report = <span class="hljs-title function_">reportSpeed</span>(<span class="hljs-string">'#reportmessage'</span>, <span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) {
<span class="hljs-keyword">return</span> <span class="hljs-string">` Current classes: "<span class="hljs-subst">${flower.get(<span class="hljs-string">'classes'</span>)}</span>"`</span>;
});</pre></div></div>
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<p>Create the Display cycle animation</p>
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<div class="content"><div class='highlight'><pre>scrawl.<span class="hljs-title function_">makeRender</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">'demo-animation'</span>,
<span class="hljs-attr">commence</span>: checkForFlowerClassUpdates,
<span class="hljs-attr">target</span>: stack,
<span class="hljs-attr">afterShow</span>: report,</pre></div></div>
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<p>We need to finalize the stack’s display after the first Display cycle completes</p>
<ul>
<li>Tweaking the stack’s <code>height</code> attribute should cascade through to its constituent elements, so that they can finalize their own dimensions and positioning (which in this case are both set relative to the stack’s dimensions).</li>
</ul>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-attr">afterCreated</span>: <span class="hljs-function">() =></span> stack.<span class="hljs-title function_">set</span>({<span class="hljs-attr">height</span>: <span class="hljs-number">400</span>}),
});</pre></div></div>
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</ul>
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