scrawl-canvas
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Version 8.9.4 - 19 Nov 2022
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<ul class="sections">
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<h1 id="demo-dom-009">Demo DOM 009</h1>
<p>Stop and restart the main animation loop; add and remove event listener; retrieve all artefacts at a given coordinate</p>
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<p><a href="../../demo/dom-009.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">let</span> artefact = scrawl.<span class="hljs-property">library</span>.<span class="hljs-property">artefact</span>,
stack = artefact.<span class="hljs-property">mystack</span>;
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">600</span>,
});</pre></div></div>
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<p>Create a group to hold all the circles</p>
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<div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> circleGroup = scrawl.<span class="hljs-title function_">makeGroup</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">'circles'</span>,
<span class="hljs-attr">host</span>: <span class="hljs-string">'mystack'</span>,
}).<span class="hljs-title function_">moveArtefactsIntoGroup</span>(<span class="hljs-string">'f_0'</span>, <span class="hljs-string">'f_1'</span>, <span class="hljs-string">'f_2'</span>, <span class="hljs-string">'f_3'</span>, <span class="hljs-string">'f_4'</span>, <span class="hljs-string">'f_5'</span>, <span class="hljs-string">'f_6'</span>, <span class="hljs-string">'f_7'</span>, <span class="hljs-string">'f_8'</span>, <span class="hljs-string">'f_9'</span>, <span class="hljs-string">'f_10'</span>, <span class="hljs-string">'f_11'</span>, <span class="hljs-string">'f_12'</span>, <span class="hljs-string">'f_13'</span>, <span class="hljs-string">'f_14'</span>, <span class="hljs-string">'f_15'</span>, <span class="hljs-string">'f_16'</span>, <span class="hljs-string">'f_17'</span>, <span class="hljs-string">'f_18'</span>, <span class="hljs-string">'f_19'</span>, <span class="hljs-string">'f_20'</span>, <span class="hljs-string">'f_21'</span>, <span class="hljs-string">'f_22'</span>, <span class="hljs-string">'f_23'</span>, <span class="hljs-string">'f_24'</span>, <span class="hljs-string">'f_25'</span>, <span class="hljs-string">'f_26'</span>, <span class="hljs-string">'f_27'</span>, <span class="hljs-string">'f_28'</span>, <span class="hljs-string">'f_29'</span>, <span class="hljs-string">'f_30'</span>, <span class="hljs-string">'f_31'</span>, <span class="hljs-string">'f_32'</span>, <span class="hljs-string">'f_33'</span>, <span class="hljs-string">'f_34'</span>, <span class="hljs-string">'f_35'</span>, <span class="hljs-string">'f_36'</span>, <span class="hljs-string">'f_37'</span>, <span class="hljs-string">'f_38'</span>, <span class="hljs-string">'f_39'</span>, <span class="hljs-string">'f_40'</span>, <span class="hljs-string">'f_41'</span>, <span class="hljs-string">'f_42'</span>, <span class="hljs-string">'f_43'</span>, <span class="hljs-string">'f_44'</span>, <span class="hljs-string">'f_45'</span>, <span class="hljs-string">'f_46'</span>, <span class="hljs-string">'f_47'</span>, <span class="hljs-string">'f_48'</span>, <span class="hljs-string">'f_49'</span>);</pre></div></div>
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<p>Simple random integer number generator</p>
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<div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> <span class="hljs-title function_">getRandom</span> = (<span class="hljs-params">n</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>() * n);</pre></div></div>
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<p>Using a color factory object to generate random colors within a restricted palette</p>
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<div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> colorFactory = scrawl.<span class="hljs-title function_">makeColor</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">'myColorObject'</span>,
<span class="hljs-attr">minimumColor</span>: <span class="hljs-string">'maroon'</span>,
<span class="hljs-attr">maximumColor</span>: <span class="hljs-string">'darkgreen'</span>,
});
circleGroup.<span class="hljs-property">artefacts</span>.<span class="hljs-title function_">forEach</span>(<span class="hljs-function"><span class="hljs-params">name</span> =></span> {
<span class="hljs-keyword">let</span> d = <span class="hljs-title function_">getRandom</span>(<span class="hljs-number">50</span>) + <span class="hljs-number">50</span>;
<span class="hljs-keyword">let</span> art = artefact[name];
art.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">width</span>: d,
<span class="hljs-attr">height</span>: d,
<span class="hljs-attr">startX</span>: <span class="hljs-string">`<span class="hljs-subst">${getRandom(<span class="hljs-number">20</span>) + <span class="hljs-number">40</span>}</span>%`</span>,
<span class="hljs-attr">startY</span>: <span class="hljs-string">`<span class="hljs-subst">${getRandom(<span class="hljs-number">20</span>) + <span class="hljs-number">40</span>}</span>%`</span>,
<span class="hljs-attr">handleX</span>: <span class="hljs-title function_">getRandom</span>(<span class="hljs-number">500</span>) - <span class="hljs-number">250</span>,
<span class="hljs-attr">handleY</span>: <span class="hljs-title function_">getRandom</span>(<span class="hljs-number">500</span>) - <span class="hljs-number">250</span>,
<span class="hljs-attr">roll</span>: <span class="hljs-title function_">getRandom</span>(<span class="hljs-number">360</span>),
<span class="hljs-attr">collides</span>: <span class="hljs-literal">true</span>,
<span class="hljs-attr">delta</span>: {
<span class="hljs-attr">roll</span>: (<span class="hljs-title function_">getRandom</span>(<span class="hljs-number">5</span>) / <span class="hljs-number">20</span>) + <span class="hljs-number">0.15</span>
},
<span class="hljs-attr">css</span>: {
<span class="hljs-attr">backgroundColor</span>: colorFactory.<span class="hljs-title function_">getRangeColor</span>(<span class="hljs-title class_">Math</span>.<span class="hljs-title function_">random</span>()),
<span class="hljs-attr">border</span>: <span class="hljs-string">'1px solid black'</span>,
}
});
});</pre></div></div>
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<p>Create a group to hold the buttons (also: test Group cloning and packet functionality)</p>
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<div class="content"><div class='highlight'><pre><span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(circleGroup.<span class="hljs-title function_">saveAsPacket</span>());</pre></div></div>
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<pre><code><span class="hljs-attr">RESULTS</span>:
[
<span class="hljs-string">"circles"</span>,
<span class="hljs-string">"Group"</span>,
<span class="hljs-string">"group"</span>,
{
<span class="hljs-string">"name"</span>:<span class="hljs-string">"circles"</span>,
<span class="hljs-string">"artefacts"</span>:[<span class="hljs-string">"f_0"</span>,<span class="hljs-string">"f_1"</span>,<span class="hljs-string">"f_2"</span>,<span class="hljs-string">"f_3"</span>,etc],
<span class="hljs-string">"host"</span>:<span class="hljs-string">"mystack"</span>
}
]
</code></pre>
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<p>Test group cloning</p>
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<div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> buttonGroup = circleGroup.<span class="hljs-title function_">clone</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">'buttons'</span>,
}).<span class="hljs-title function_">clearArtefacts</span>().<span class="hljs-title function_">moveArtefactsIntoGroup</span>(<span class="hljs-string">'start_animation'</span>, <span class="hljs-string">'stop_animation'</span>, <span class="hljs-string">'start_listeners'</span>, <span class="hljs-string">'stop_listeners'</span>);
<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(buttonGroup.<span class="hljs-title function_">saveAsPacket</span>());</pre></div></div>
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<pre><code><span class="hljs-attr">RESULTS</span>:
[
<span class="hljs-string">"buttons"</span>,
<span class="hljs-string">"Group"</span>,
<span class="hljs-string">"group"</span>,
{
<span class="hljs-string">"name"</span>:<span class="hljs-string">"buttons"</span>,
<span class="hljs-string">"artefacts"</span>:[<span class="hljs-string">"start_animation"</span>,<span class="hljs-string">"stop_animation"</span>,<span class="hljs-string">"start_listeners"</span>,<span class="hljs-string">"stop_listeners"</span>],
<span class="hljs-string">"host"</span>:<span class="hljs-string">"mystack"</span>
}
]
</code></pre>
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<p>User controls setup</p>
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<div class="content"><div class='highlight'><pre>buttonGroup.<span class="hljs-title function_">setArtefacts</span>({
<span class="hljs-attr">width</span>: <span class="hljs-number">240</span>,
<span class="hljs-attr">height</span>: <span class="hljs-number">28</span>,
<span class="hljs-attr">css</span>: {
<span class="hljs-attr">textAlign</span>: <span class="hljs-string">'left'</span>,
},
<span class="hljs-attr">domAttributes</span>: {
<span class="hljs-attr">disabled</span>: <span class="hljs-string">''</span>,
},
});
artefact.<span class="hljs-property">start_animation</span>.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">startY</span>: <span class="hljs-number">0</span>,
});
artefact.<span class="hljs-property">stop_animation</span>.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">startY</span>: <span class="hljs-number">30</span>,
<span class="hljs-attr">domAttributes</span>: {
<span class="hljs-attr">disabled</span>: <span class="hljs-string">'disabled'</span>,
},
});
artefact.<span class="hljs-property">start_listeners</span>.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">startY</span>: <span class="hljs-number">60</span>,
});
artefact.<span class="hljs-property">stop_listeners</span>.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">startY</span>: <span class="hljs-number">90</span>,
<span class="hljs-attr">domAttributes</span>: {
<span class="hljs-attr">disabled</span>: <span class="hljs-string">'disabled'</span>,
},
});</pre></div></div>
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<p>The <code>apply</code> function triggers the artefact to render itself outside of the Scrawl-canvas display cycle - this will then trigger artefacts (in this case the 50 circles) to recalculate their positions so they can correctly place themselves within the Stack</p>
</div>
<div class="content"><div class='highlight'><pre>stack.<span class="hljs-title function_">apply</span>();</pre></div></div>
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<p>Variable holds a value shared betwen two different functions</p>
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<div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> targetsLength = <span class="hljs-number">0</span>;</pre></div></div>
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<h4 id="scene-animation">Scene animation</h4>
<p>Clean up circles before the start of next display cycle</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> reviewCircleClasses = <span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) {
<span class="hljs-keyword">let</span> firstRun = <span class="hljs-literal">true</span>;
<span class="hljs-keyword">return</span> <span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) {</pre></div></div>
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<p>we need the animation cycle to run once before we disable it</p>
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<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">if</span>(firstRun){
firstRun = <span class="hljs-literal">false</span>;
scrawl.<span class="hljs-title function_">stopCoreAnimationLoop</span>();
}</pre></div></div>
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