scrawl-canvas
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Version 8.9.4 - 19 Nov 2022
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<h1 id="demo-canvas-034">Demo Canvas 034</h1>
<p>Determine the displayed shape of the visible canvas; react to changes in the displayed shape</p>
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<p><a href="../../demo/canvas-034.html">Run code</a></p>
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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>;
<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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<h4 id="scene-setup">Scene setup</h4>
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<div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> canvas = scrawl.<span class="hljs-property">library</span>.<span class="hljs-property">canvas</span>.<span class="hljs-property">mycanvas</span>;</pre></div></div>
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<p>Create the demo Phrase entity</p>
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<div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> mytext = scrawl.<span class="hljs-title function_">makePhrase</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">'display-shape-text'</span>,
<span class="hljs-attr">start</span>: [<span class="hljs-string">'center'</span>, <span class="hljs-string">'center'</span>],
<span class="hljs-attr">handle</span>: [<span class="hljs-string">'center'</span>, <span class="hljs-string">'center'</span>],
<span class="hljs-attr">text</span>: <span class="hljs-string">`Canvas display shape: undetermined`</span>,
<span class="hljs-attr">size</span>: <span class="hljs-string">'40px'</span>,
<span class="hljs-attr">justify</span>: <span class="hljs-string">'center'</span>,
<span class="hljs-attr">fillStyle</span>: <span class="hljs-string">'black'</span>,
});</pre></div></div>
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<p>Scrawl-canvas recognises five shapes, separated by four breakpoints: </p>
<ul>
<li><code>banner</code></li>
<li><code>landscape</code></li>
<li><code>rectangle</code></li>
<li><code>portrait</code></li>
<li><code>skyscraper</code></li>
</ul>
<p>The values assigned to the breakpoints are Float numbers for the displayed Canvas element’s width/height ratio - the value <code>3</code> represents the case where the width value is three times <strong>more</strong> than the height value, while <code>0.35</code> represents a width (roughly) 3 times <strong>less</strong> than the height.</p>
<p>We can set a Canvas artefact’s breakpoints in one go using the dedicated <code>setDisplayShapeBreakpoints()</code> function, as below. Alternatively we can use the regular <code>set()</code> function, supplying the attributes <code>breakToBanner</code>, <code>breakToLandscape</code>, <code>breakToPortrait</code> and <code>breakToSkyscraper</code> as required. The values given here are the default values for Canvas artefacts.</p>
<p>Similar functionality exists to adjust to the current (base) Cell area (width * height)</p>
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<div class="content"><div class='highlight'><pre>canvas.<span class="hljs-title function_">setDisplayShapeBreakpoints</span>({
<span class="hljs-attr">breakToBanner</span>: <span class="hljs-number">3</span>,
<span class="hljs-attr">breakToLandscape</span>: <span class="hljs-number">1.5</span>,
<span class="hljs-attr">breakToPortrait</span>: <span class="hljs-number">0.65</span>,
<span class="hljs-attr">breakToSkyscraper</span>: <span class="hljs-number">0.35</span>,
<span class="hljs-attr">breakToSmallest</span>: <span class="hljs-number">100000</span>,
<span class="hljs-attr">breakToSmaller</span>: <span class="hljs-number">150000</span>,
<span class="hljs-attr">breakToLarger</span>: <span class="hljs-number">200000</span>,
<span class="hljs-attr">breakToLargest</span>: <span class="hljs-number">300000</span>,
});</pre></div></div>
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<li id="section-6">
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<a class="ss" href="#section-6">§</a>
</div>
<p>Each display shape has an associated hook function (by default a function that does nothing) which Scrawl-canvas will run each time it detects that the Canvas display shape has changed to that shape. We can replace these null-functions with our own; this allows us to configure the scene/animation to accommodate different display shapes, thus making the code reusable in a range of different web page environments.</p>
<p>We can set/update these functions at any time using the normal <code>set()</code> function:</p>
</div>
<div class="content"><div class='highlight'><pre>canvas.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">actionBannerShape</span>: <span class="hljs-function">() =></span> {
mytext.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">text</span>: <span class="hljs-string">`Canvas display shape: <span class="hljs-subst">${canvas.get(<span class="hljs-string">'displayShape'</span>)}</span>`</span>,
<span class="hljs-attr">roll</span>: <span class="hljs-number">0</span>,
});
},
<span class="hljs-attr">actionRectangleShape</span>: <span class="hljs-function">() =></span> {
mytext.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">text</span>: <span class="hljs-string">`Canvas display shape: <span class="hljs-subst">${canvas.get(<span class="hljs-string">'displayShape'</span>)}</span>`</span>,
<span class="hljs-attr">roll</span>: -<span class="hljs-number">45</span>,
});
},
<span class="hljs-attr">actionSkyscraperShape</span>: <span class="hljs-function">() =></span> {
mytext.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">text</span>: <span class="hljs-string">`Canvas display shape: <span class="hljs-subst">${canvas.get(<span class="hljs-string">'displayShape'</span>)}</span>`</span>,
<span class="hljs-attr">roll</span>: -<span class="hljs-number">90</span>,
});
},
<span class="hljs-attr">actionLargestArea</span>: <span class="hljs-function">() =></span> {
mytext.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">size</span>: <span class="hljs-string">'40px'</span>,
});
},
<span class="hljs-attr">actionRegularArea</span>: <span class="hljs-function">() =></span> {
mytext.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">size</span>: <span class="hljs-string">'28px'</span>,
});
},
<span class="hljs-attr">actionSmallestArea</span>: <span class="hljs-function">() =></span> {
mytext.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">size</span>: <span class="hljs-string">'16px'</span>,
});
},
});</pre></div></div>
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<li id="section-7">
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<a class="ss" href="#section-7">§</a>
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<p>We can also set/update the functions using dedicated <code>setAction???Shape()</code> functions:</p>
</div>
<div class="content"><div class='highlight'><pre>canvas.<span class="hljs-title function_">setActionPortraitShape</span>(<span class="hljs-function">() =></span> {
mytext.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">text</span>: <span class="hljs-string">`Canvas display shape: <span class="hljs-subst">${canvas.get(<span class="hljs-string">'displayShape'</span>)}</span>`</span>,
<span class="hljs-attr">roll</span>: -<span class="hljs-number">67.5</span>,
});
});
canvas.<span class="hljs-title function_">setActionLandscapeShape</span>(<span class="hljs-function">() =></span> {
mytext.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">text</span>: <span class="hljs-string">`Canvas display shape: <span class="hljs-subst">${canvas.get(<span class="hljs-string">'displayShape'</span>)}</span>`</span>,
<span class="hljs-attr">roll</span>: -<span class="hljs-number">22.5</span>,
});
});
canvas.<span class="hljs-title function_">setActionLargerArea</span>(<span class="hljs-function">() =></span> {
mytext.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">size</span>: <span class="hljs-string">'34px'</span>,
});
});
canvas.<span class="hljs-title function_">setActionSmallerArea</span>(<span class="hljs-function">() =></span> {
mytext.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">size</span>: <span class="hljs-string">'22px'</span>,
});
});</pre></div></div>
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<li id="section-8">
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<a class="ss" href="#section-8">§</a>
</div>
<h4 id="scene-animation">Scene animation</h4>
<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>);</pre></div></div>
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<li id="section-9">
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<a class="ss" href="#section-9">§</a>
</div>
<p>Create the Display cycle animation</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> demoAnimation = 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">target</span>: canvas,
<span class="hljs-attr">afterShow</span>: report,
});</pre></div></div>
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<a class="ss" href="#section-10">§</a>
</div>
<h4 id="development-and-testing">Development and testing</h4>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(scrawl.<span class="hljs-property">library</span>);</pre></div></div>
</li>
</ul>
</div>
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