scrawl-canvas
Version:
Version 8.9.4 - 19 Nov 2022
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<title>Demo Canvas 057</title>
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</li>
</ul>
<ul class="sections">
<li id="section-1">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-1">§</a>
</div>
<h1 id="demo-canvas-057">Demo Canvas 057</h1>
<p>Animation observer; animations controlled by scroll position</p>
</div>
</li>
<li id="section-2">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-2">§</a>
</div>
<p><a href="../../demo/canvas-057.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>;</pre></div></div>
</li>
<li id="section-3">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-3">§</a>
</div>
<h4 id="scene-setup">Scene setup</h4>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> fc = scrawl.<span class="hljs-property">library</span>.<span class="hljs-property">canvas</span>[<span class="hljs-string">'fixed-canvas'</span>],
rc1 = scrawl.<span class="hljs-property">library</span>.<span class="hljs-property">canvas</span>[<span class="hljs-string">'responsive-canvas-1'</span>],
rc2 = scrawl.<span class="hljs-property">library</span>.<span class="hljs-property">canvas</span>[<span class="hljs-string">'responsive-canvas-2'</span>],
rc3 = scrawl.<span class="hljs-property">library</span>.<span class="hljs-property">canvas</span>[<span class="hljs-string">'responsive-canvas-3'</span>],
bc1 = scrawl.<span class="hljs-property">library</span>.<span class="hljs-property">canvas</span>[<span class="hljs-string">'banner-canvas-1'</span>],
bc2 = scrawl.<span class="hljs-property">library</span>.<span class="hljs-property">canvas</span>[<span class="hljs-string">'banner-canvas-2'</span>];
<span class="hljs-keyword">const</span> canvasSet = {
<span class="hljs-attr">fit</span>: <span class="hljs-string">'cover'</span>,
<span class="hljs-attr">checkForResize</span>: <span class="hljs-literal">true</span>,
<span class="hljs-attr">ignoreCanvasCssDimensions</span>: <span class="hljs-literal">true</span>,
<span class="hljs-attr">baseMatchesCanvasDimensions</span>: <span class="hljs-literal">true</span>,
};
fc.<span class="hljs-title function_">set</span>(canvasSet);
rc1.<span class="hljs-title function_">set</span>(canvasSet);
rc2.<span class="hljs-title function_">set</span>(canvasSet);
rc3.<span class="hljs-title function_">set</span>(canvasSet);
bc1.<span class="hljs-title function_">set</span>(canvasSet);
bc2.<span class="hljs-title function_">set</span>(canvasSet);</pre></div></div>
</li>
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<div class="annotation">
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<a class="ss" href="#section-4">§</a>
</div>
<h4 id="fixed-canvas">Fixed canvas</h4>
<p>Update the text values of three Phrase entitys based on the positions of the top, center and base of the canvas element in the viewport</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> fixedCanvasIsDisplaying,
fixedCanvasDragZone;
<span class="hljs-keyword">const</span> fcAnimation = scrawl.<span class="hljs-title function_">makeRender</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">'fc-animation'</span>,
<span class="hljs-attr">target</span>: fc,
});</pre></div></div>
</li>
<li id="section-5">
<div class="annotation">
<div class="sswrap ">
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</div>
<h4 id="responsive-canvas-1">Responsive canvas 1</h4>
<p>Update the text values of three Phrase entitys based on the positions of the top, center and base of the <canvas> element in the viewport. The element is responsive, with positions updating as the element is resized.</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> rc1PhraseTop = scrawl.<span class="hljs-title function_">makePhrase</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">'rc1-pos-top'</span>,
<span class="hljs-attr">group</span>: rc1.<span class="hljs-property">base</span>.<span class="hljs-property">name</span>,
<span class="hljs-attr">start</span>: [<span class="hljs-string">'center'</span>, <span class="hljs-string">'5%'</span>],
<span class="hljs-attr">handle</span>: [<span class="hljs-string">'center'</span>, <span class="hljs-string">'center'</span>],
<span class="hljs-attr">font</span>: <span class="hljs-string">'20px Arial, sans-serif'</span>,
<span class="hljs-attr">lineHeight</span>: <span class="hljs-number">1</span>,
});
<span class="hljs-keyword">const</span> rc1PhraseCenter = rc1PhraseTop.<span class="hljs-title function_">clone</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">'rc1-pos-center'</span>,
<span class="hljs-attr">startY</span>: <span class="hljs-string">'center'</span>,
});
<span class="hljs-keyword">const</span> rc1PhraseBase = rc1PhraseTop.<span class="hljs-title function_">clone</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">'rc1-pos-base'</span>,
<span class="hljs-attr">startY</span>: <span class="hljs-string">'95%'</span>,
});
<span class="hljs-keyword">const</span> <span class="hljs-title function_">updateRc1</span> = (<span class="hljs-params"></span>) => {
<span class="hljs-keyword">const</span> {here} = rc1;
<span class="hljs-keyword">const</span> { inViewportTop, inViewportCenter, inViewportBase } = here;
rc1PhraseTop.<span class="hljs-title function_">set</span>({ <span class="hljs-attr">text</span>: <span class="hljs-string">`Canvas top: <span class="hljs-subst">${(here.inViewportTop * <span class="hljs-number">100</span>).toFixed(<span class="hljs-number">2</span>)}</span>%`</span> });
rc1PhraseCenter.<span class="hljs-title function_">set</span>({ <span class="hljs-attr">text</span>: <span class="hljs-string">`Canvas center: <span class="hljs-subst">${(here.inViewportCenter * <span class="hljs-number">100</span>).toFixed(<span class="hljs-number">2</span>)}</span>%`</span> });
rc1PhraseBase.<span class="hljs-title function_">set</span>({ <span class="hljs-attr">text</span>: <span class="hljs-string">`Canvas base: <span class="hljs-subst">${(here.inViewportBase * <span class="hljs-number">100</span>).toFixed(<span class="hljs-number">2</span>)}</span>%`</span> });
};
<span class="hljs-keyword">const</span> rc1Animation = scrawl.<span class="hljs-title function_">makeRender</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">"rc1-animation"</span>,
<span class="hljs-attr">target</span>: rc1,
<span class="hljs-attr">observer</span>: <span class="hljs-literal">true</span>,
<span class="hljs-attr">commence</span>: updateRc1,
});</pre></div></div>
</li>
<li id="section-6">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-6">§</a>
</div>
<h4 id="responsive-canvas-2">Responsive canvas 2</h4>
<p>Update the start and end points of a gradient based on the positions of the top and base of the <canvas> element in the viewport. Link artefact animation to the element’s position.</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> rc2Color1 = scrawl.<span class="hljs-title function_">makeColor</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">'rc2-color-factory-1'</span>,
<span class="hljs-attr">maximumColor</span>: <span class="hljs-string">'red'</span>,
<span class="hljs-attr">minimumColor</span>: <span class="hljs-string">'blue'</span>,
});
<span class="hljs-keyword">const</span> rc2Color2 = scrawl.<span class="hljs-title function_">makeColor</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">'rc2-color-factory-2'</span>,
<span class="hljs-attr">maximumColor</span>: <span class="hljs-string">'green'</span>,
<span class="hljs-attr">minimumColor</span>: <span class="hljs-string">'yellow'</span>,
});
<span class="hljs-keyword">const</span> rc2Gradient = scrawl.<span class="hljs-title function_">makeGradient</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">'rc2-gradient'</span>,
<span class="hljs-attr">endX</span>: <span class="hljs-string">'100%'</span>,
});
scrawl.<span class="hljs-title function_">makeLine</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">'rc2-line'</span>,
<span class="hljs-attr">group</span>: rc2.<span class="hljs-property">base</span>.<span class="hljs-property">name</span>,
<span class="hljs-attr">start</span>: [<span class="hljs-string">'center'</span>, <span class="hljs-string">'center'</span>],
<span class="hljs-attr">end</span>: [<span class="hljs-string">'90%'</span>, <span class="hljs-string">'center'</span>],
<span class="hljs-attr">handleX</span>: <span class="hljs-string">'50%'</span>,
<span class="hljs-attr">method</span>: <span class="hljs-string">'draw'</span>,
<span class="hljs-attr">strokeStyle</span>: <span class="hljs-string">'rc2-gradient'</span>,
<span class="hljs-attr">lockStrokeStyleToEntity</span>: <span class="hljs-literal">true</span>,
<span class="hljs-attr">lineWidth</span>: <span class="hljs-number">5</span>,
<span class="hljs-attr">lineCap</span>: <span class="hljs-string">'round'</span>,
});
scrawl.<span class="hljs-title function_">makeBlock</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">'rc2-block-1'</span>,
<span class="hljs-attr">group</span>: rc2.<span class="hljs-property">base</span>.<span class="hljs-property">name</span>,
<span class="hljs-attr">start</span>: [<span class="hljs-string">'25%'</span>, <span class="hljs-string">'25%'</span>],
<span class="hljs-attr">handle</span>: [<span class="hljs-string">'center'</span>, <span class="hljs-string">'center'</span>],
<span class="hljs-attr">dimensions</span>: [<span class="hljs-string">'40%'</span>, <span class="hljs-string">'10%'</span>],
<span class="hljs-attr">method</span>: <span class="hljs-string">'fillThenDraw'</span>,
<span class="hljs-attr">fillStyle</span>: <span class="hljs-string">'rc2-gradient'</span>,
<span class="hljs-attr">lockFillStyleToEntity</span>: <span class="hljs-literal">true</span>,
<span class="hljs-attr">lineWidth</span>: <span class="hljs-number">5</span>,
<span class="hljs-attr">lineCap</span>: <span class="hljs-string">'round'</span>,
}).<span class="hljs-title function_">clone</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">'rc2-block-2'</span>,
<span class="hljs-attr">start</span>: [<span class="hljs-string">'75%'</span>, <span class="hljs-string">'75%'</span>],
<span class="hljs-attr">flipReverse</span>: <span class="hljs-literal">true</span>,
});
scrawl.<span class="hljs-title function_">makeWheel</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">'rc2-wheel-1'</span>,
<span class="hljs-attr">group</span>: rc2.<span class="hljs-property">base</span>.<span class="hljs-property">name</span>,
<span class="hljs-attr">start</span>: [<span class="hljs-string">'25%'</span>, <span class="hljs-string">'75%'</span>],
<span class="hljs-attr">handle</span>: [<span class="hljs-string">'center'</span>, <span class="hljs-string">'center'</span>],
<span class="hljs-attr">radius</span>: <span class="hljs-string">'20%'</span>,
<span class="hljs-attr">startAngle</span>: <span class="hljs-number">20</span>,
<span class="hljs-attr">endAngle</span>: -<span class="hljs-number">20</span>,
<span class="hljs-attr">includeCenter</span>: <span class="hljs-literal">true</span>,
<span class="hljs-attr">method</span>: <span class="hljs-string">'fillThenDraw'</span>,
<span class="hljs-attr">fillStyle</span>: <span class="hljs-string">'rc2-gradient'</span>,
<span class="hljs-attr">lockFillStyleToEntity</span>: <span class="hljs-literal">true</span>,
<span class="hljs-attr">lineWidth</span>: <span class="hljs-number">5</span>,
<span class="hljs-attr">lineCap</span>: <span class="hljs-string">'round'</span>,
}).<span class="hljs-title function_">clone</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">'rc2-wheel-2'</span>,
<span class="hljs-attr">start</span>: [<span class="hljs-string">'75%'</span>, <span class="hljs-string">'25%'</span>],
<span class="hljs-attr">flipReverse</span>: <span class="hljs-literal">true</span>,
});
<span class="hljs-keyword">const</span> <span class="hljs-title function_">updateRc2</span> = (<span class="hljs-params"></span>) => {
<span class="hljs-keyword">const</span> {here} = rc2;
<span class="hljs-keyword">let</span> { inViewportTop, inViewportCenter, inViewportBase } = here;
<span class="hljs-keyword">const</span> group = scrawl.<span class="hljs-property">library</span>.<span class="hljs-property">group</span>[rc2.<span class="hljs-property">base</span>.<span class="hljs-property">name</span>];
<span class="hljs-keyword">if</span> (inViewportTop < <span class="hljs-number">0</span>) inViewportTop = <span class="hljs-number">0</span>;
<span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (inViewportTop > <span class="hljs-number">1</span>) inViewportTop = <span class="hljs-number">1</span>;
<span class="hljs-keyword">if</span> (inViewportBase < <span class="hljs-number">0</span>) inViewportBase = <span class="hljs-number">0</span>;
<span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (inViewportBase > <span class="hljs-number">1</span>) inViewportBase = <span class="hljs-number">1</span>;
<span class="hljs-keyword">if</span> (inViewportCenter < <span class="hljs-number">0</span>) inViewportCenter = <span class="hljs-number">0</span>;
<span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (inViewportCenter > <span class="hljs-number">1</span>) inViewportCenter = <span class="hljs-number">1</span>;
group.<span class="hljs-title function_">setArtefacts</span>({ <span class="hljs-attr">roll</span>: inViewportCenter * -<span class="hljs-number">360</span> });
rc2Gradient.<span class="hljs-title function_">updateColor</span>(<span class="hljs-number">0</span>, rc2Color1.<span class="hljs-title function_">getRangeColor</span>(inViewportTop));
rc2Gradient.<span class="hljs-title function_">updateColor</span>(<span class="hljs-number">999</span>, rc2Color2.<span class="hljs-title function_">getRangeColor</span>(inViewportBase));
};
<span class="hljs-keyword">const</span> rc2Animation = scrawl.<span class="hljs-title function_">makeRender</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">"rc2-animation"</span>,
<span class="hljs-attr">target</span>: rc2,
<span class="hljs-attr">observer</span>: <span class="hljs-literal">true</span>,
<span class="hljs-attr">commence</span>: updateRc2,
});</pre></div></div>
</li>
<li id="section-7">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-7">§</a>
</div>
<h4 id="banner-canvas-1">Banner canvas 1</h4>
<p>Fix an animation to the viewport while the user scrolls through the page. When the animation completes, the <canvas> element rejoins the page scroll. The canvas remains interactive before, during and after the animation’s run. The animation is reversible.</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> bc1Cell = bc1.<span class="hljs-title function_">buildCell</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">'bc1-visual-cell'</span>,
<span class="hljs-attr">width</span>: <span class="hljs-string">'100%'</span>,
<span class="hljs-attr">height</span>: <span class="hljs-string">`<span class="hljs-subst">${<span class="hljs-number">100</span> / <span class="hljs-number">3</span>}</span>%`</span>,
<span class="hljs-attr">backgroundColor</span>: