scrawl-canvas
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Version 8.9.4 - 19 Nov 2022
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<h1>dom-014a.js</h1>
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<div class="sswrap ">
<a class="ss" href="#section-1">§</a>
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<h2 id="demo-dom-014---first-scene">Demo DOM 014 - first scene</h2>
<p>Load and run multiple scripts on same page</p>
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<p><a href="../../demo/dom-014.html">Run code</a></p>
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<div class="content"><div class='highlight'><pre><span class="hljs-keyword">import</span> scrawl <span class="hljs-keyword">from</span> <span class="hljs-string">'../source/scrawl.js'</span>
<span class="hljs-keyword">let</span> canvas = scrawl.<span class="hljs-property">library</span>.<span class="hljs-property">artefact</span>.<span class="hljs-property">mycanvas1</span>;
canvas.<span class="hljs-title function_">setAsCurrentCanvas</span>();
canvas.<span class="hljs-title function_">setBase</span>({
<span class="hljs-attr">backgroundColor</span>: <span class="hljs-string">'aliceblue'</span>,
});
<span class="hljs-keyword">let</span> myPivot = scrawl.<span class="hljs-title function_">makeWheel</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">'mouse-pivot'</span>,
<span class="hljs-attr">method</span>: <span class="hljs-string">'none'</span>,
<span class="hljs-attr">startX</span>: <span class="hljs-string">'center'</span>,
<span class="hljs-attr">startY</span>: <span class="hljs-string">'center'</span>,
});
<span class="hljs-keyword">let</span> myblock = scrawl.<span class="hljs-title function_">makeBlock</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">'base-block'</span>,
<span class="hljs-attr">width</span>: <span class="hljs-number">150</span>,
<span class="hljs-attr">height</span>: <span class="hljs-number">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">offsetX</span>: -<span class="hljs-number">140</span>,
<span class="hljs-attr">offsetY</span>: -<span class="hljs-number">50</span>,
<span class="hljs-attr">pivot</span>: <span class="hljs-string">'mouse-pivot'</span>,
<span class="hljs-attr">lockTo</span>: <span class="hljs-string">'pivot'</span>,
<span class="hljs-attr">fillStyle</span>: <span class="hljs-string">'darkblue'</span>,
<span class="hljs-attr">strokeStyle</span>: <span class="hljs-string">'gold'</span>,
<span class="hljs-attr">method</span>: <span class="hljs-string">'fillAndDraw'</span>,
<span class="hljs-attr">lineWidth</span>: <span class="hljs-number">6</span>,
<span class="hljs-attr">lineJoin</span>: <span class="hljs-string">'round'</span>,
<span class="hljs-attr">delta</span>: {
<span class="hljs-attr">roll</span>: <span class="hljs-number">0.5</span>,
},
});
<span class="hljs-keyword">let</span> mywheel = scrawl.<span class="hljs-title function_">makeWheel</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">'base-wheel'</span>,
<span class="hljs-attr">radius</span>: <span class="hljs-number">60</span>,
<span class="hljs-attr">startAngle</span>: <span class="hljs-number">35</span>,
<span class="hljs-attr">endAngle</span>: -<span class="hljs-number">35</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">offsetX</span>: <span class="hljs-number">140</span>,
<span class="hljs-attr">offsetY</span>: <span class="hljs-number">50</span>,
<span class="hljs-attr">pivot</span>: <span class="hljs-string">'mouse-pivot'</span>,
<span class="hljs-attr">lockTo</span>: <span class="hljs-string">'pivot'</span>,
<span class="hljs-attr">fillStyle</span>: <span class="hljs-string">'purple'</span>,
<span class="hljs-attr">strokeStyle</span>: <span class="hljs-string">'gold'</span>,
<span class="hljs-attr">method</span>: <span class="hljs-string">'fillAndDraw'</span>,
<span class="hljs-attr">lineWidth</span>: <span class="hljs-number">6</span>,
<span class="hljs-attr">lineJoin</span>: <span class="hljs-string">'round'</span>,
<span class="hljs-attr">delta</span>: {
<span class="hljs-attr">roll</span>: -<span class="hljs-number">0.5</span>,
},
});
myblock.<span class="hljs-title function_">clone</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">'pivot-block'</span>,
<span class="hljs-attr">height</span>: <span class="hljs-number">30</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">strokeStyle</span>: <span class="hljs-string">'red'</span>,
<span class="hljs-attr">lineWidth</span>: <span class="hljs-number">3</span>,
<span class="hljs-attr">method</span>: <span class="hljs-string">'draw'</span>,
<span class="hljs-attr">pivot</span>: <span class="hljs-string">'base-block'</span>,
<span class="hljs-attr">lockTo</span>: <span class="hljs-string">'pivot'</span>,
<span class="hljs-attr">offsetX</span>: <span class="hljs-number">0</span>,
<span class="hljs-attr">offsetY</span>: <span class="hljs-number">110</span>,
<span class="hljs-attr">addPivotOffset</span>: <span class="hljs-literal">true</span>,
<span class="hljs-attr">delta</span>: {
<span class="hljs-attr">roll</span>: <span class="hljs-number">0</span>,
},
}).<span class="hljs-title function_">clone</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">'pivot-wheel'</span>,
<span class="hljs-attr">pivot</span>: <span class="hljs-string">'base-wheel'</span>,
<span class="hljs-attr">addPivotRotation</span>: <span class="hljs-literal">true</span>,
<span class="hljs-attr">handleX</span>: <span class="hljs-number">0</span>,
<span class="hljs-attr">handleY</span>: <span class="hljs-string">'50%'</span>,
<span class="hljs-attr">offsetY</span>: <span class="hljs-number">0</span>,
}).<span class="hljs-title function_">clone</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">'mimic-wheel'</span>,
<span class="hljs-attr">mimic</span>: <span class="hljs-string">'base-wheel'</span>,
<span class="hljs-attr">lockTo</span>: <span class="hljs-string">'mimic'</span>,
<span class="hljs-attr">width</span>: <span class="hljs-number">20</span>,
<span class="hljs-attr">height</span>: <span class="hljs-number">20</span>,
<span class="hljs-attr">handleX</span>: <span class="hljs-number">10</span>,
<span class="hljs-attr">handleY</span>: <span class="hljs-number">10</span>,
<span class="hljs-attr">strokeStyle</span>: <span class="hljs-string">'darkgreen'</span>,
<span class="hljs-attr">useMimicDimensions</span>: <span class="hljs-literal">true</span>,
<span class="hljs-attr">useMimicScale</span>: <span class="hljs-literal">true</span>,
<span class="hljs-attr">useMimicStart</span>: <span class="hljs-literal">true</span>,
<span class="hljs-attr">useMimicHandle</span>: <span class="hljs-literal">true</span>,
<span class="hljs-attr">useMimicOffset</span>: <span class="hljs-literal">true</span>,
<span class="hljs-attr">useMimicRotation</span>: <span class="hljs-literal">true</span>,
<span class="hljs-attr">useMimicFlip</span>: <span class="hljs-literal">true</span>,
<span class="hljs-attr">addOwnDimensionsToMimic</span>: <span class="hljs-literal">true</span>,
<span class="hljs-attr">addOwnScaleToMimic</span>: <span class="hljs-literal">false</span>,
<span class="hljs-attr">addOwnStartToMimic</span>: <span class="hljs-literal">false</span>,
<span class="hljs-attr">addOwnHandleToMimic</span>: <span class="hljs-literal">true</span>,
<span class="hljs-attr">addOwnOffsetToMimic</span>: <span class="hljs-literal">false</span>,
<span class="hljs-attr">addOwnRotationToMimic</span>: <span class="hljs-literal">false</span>,
});
mywheel.<span class="hljs-title function_">clone</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">'mimic-block'</span>,
<span class="hljs-attr">mimic</span>: <span class="hljs-string">'base-block'</span>,
<span class="hljs-attr">lockTo</span>: <span class="hljs-string">'mimic'</span>,
<span class="hljs-attr">width</span>: <span class="hljs-number">60</span>,
<span class="hljs-attr">strokeStyle</span>: <span class="hljs-string">'darkgreen'</span>,
<span class="hljs-attr">lineWidth</span>: <span class="hljs-number">3</span>,
<span class="hljs-attr">method</span>: <span class="hljs-string">'draw'</span>,
<span class="hljs-attr">useMimicDimensions</span>: <span class="hljs-literal">true</span>,
<span class="hljs-attr">useMimicScale</span>: <span class="hljs-literal">true</span>,
<span class="hljs-attr">useMimicStart</span>: <span class="hljs-literal">true</span>,
<span class="hljs-attr">useMimicHandle</span>: <span class="hljs-literal">false</span>,
<span class="hljs-attr">useMimicOffset</span>: <span class="hljs-literal">true</span>,
<span class="hljs-attr">useMimicRotation</span>: <span class="hljs-literal">true</span>,
<span class="hljs-attr">addOwnDimensionsToMimic</span>: <span class="hljs-literal">true</span>,
<span class="hljs-attr">addOwnScaleToMimic</span>: <span class="hljs-literal">false</span>,
<span class="hljs-attr">addOwnStartToMimic</span>: <span class="hljs-literal">false</span>,
<span class="hljs-attr">addOwnHandleToMimic</span>: <span class="hljs-literal">false</span>,
<span class="hljs-attr">addOwnOffsetToMimic</span>: <span class="hljs-literal">false</span>,
<span class="hljs-attr">addOwnRotationToMimic</span>: <span class="hljs-literal">false</span>,
});
<span class="hljs-keyword">let</span> mouseCheck = <span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) {
<span class="hljs-keyword">let</span> active = <span class="hljs-literal">false</span>;
<span class="hljs-keyword">return</span> <span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) {
<span class="hljs-keyword">if</span> (canvas.<span class="hljs-property">here</span>.<span class="hljs-property">active</span> !== active) {
active = canvas.<span class="hljs-property">here</span>.<span class="hljs-property">active</span>;
myPivot.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">lockTo</span>: (active) ? <span class="hljs-string">'mouse'</span> : <span class="hljs-string">'start'</span>
});
}
};
}();
<span class="hljs-keyword">let</span> report = <span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) {
<span class="hljs-keyword">let</span> testTicker = <span class="hljs-title class_">Date</span>.<span class="hljs-title function_">now</span>(),
testTime, testNow,
testMessage = <span class="hljs-variable language_">document</span>.<span class="hljs-title function_">querySelector</span>(<span class="hljs-string">'#reportmessage1'</span>);
<span class="hljs-keyword">return</span> <span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) {
testNow = <span class="hljs-title class_">Date</span>.<span class="hljs-title function_">now</span>();
testTime = testNow - testTicker;
testTicker = testNow;
testMessage.<span class="hljs-property">textContent</span> = <span class="hljs-string">`Animation threshhold set to 0.5
- 50% of canvas must be visible for animation to run
Screen refresh: <span class="hljs-subst">${<span class="hljs-built_in">Math</span>.ceil(testTime)}</span>ms; fps: <span class="hljs-subst">${<span class="hljs-built_in">Math</span>.floor(<span class="hljs-number">1000</span> / testTime)}</span>`</span>;
};
}();
<span class="hljs-keyword">let</span> animation = scrawl.<span class="hljs-title function_">makeRender</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">'demo-animation1'</span>,
<span class="hljs-attr">target</span>: canvas,
<span class="hljs-attr">commence</span>: mouseCheck,
<span class="hljs-attr">afterShow</span>: report,
<span class="hljs-attr">delay</span>: <span class="hljs-literal">true</span>
});</pre></div></div>
</li>
<li id="section-3">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-3">§</a>
</div>
<p>Switch animation on/off when at least 50% of canvas is showing - this is standard ES16 Javascript, not part of Scrawl-canvas</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> observer = <span class="hljs-keyword">new</span> <span class="hljs-title class_">IntersectionObserver</span>(<span class="hljs-function">(<span class="hljs-params">entries, observer</span>) =></span> {
entries.<span class="hljs-title function_">forEach</span>(<span class="hljs-function"><span class="hljs-params">entry</span> =></span> {
<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-string">'observer A starts'</span>, animation.<span class="hljs-property">name</span>, animation.<span class="hljs-title function_">isRunning</span>(), entry.<span class="hljs-property">intersectionRatio</span>, entry.<span class="hljs-property">isIntersecting</span>);
<span class="hljs-keyword">if</span> (entry.<span class="hljs-property">isIntersecting</span> && !animation.<span class="hljs-title function_">isRunning</span>()) animation.<span class="hljs-title function_">run</span>();
<span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (!entry.<span class="hljs-property">isIntersecting</span> && animation.<span class="hljs-title function_">isRunning</span>()) animation.<span class="hljs-title function_">halt</span>();
<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-string">'observer A completes'</span>, animation.<span class="hljs-property">name</span>, animation.<span class="hljs-title function_">isRunning</span>(), entry.<span class="hljs-property">intersectionRatio</span>, entry.<span class="hljs-property">isIntersecting</span>);
});
}, { <span class="hljs-attr">threshold</span>: <span class="hljs-number">0.5</span> });
observer.<span class="hljs-title function_">observe</span>(canvas.<span class="hljs-property">domElement</span>);
<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-string">'#014a'</span>, scrawl.<span class="hljs-property">library</span>);</pre></div></div>
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