scrawl-canvas
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Version 8.9.4 - 19 Nov 2022
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<ul class="sections">
<li id="section-1">
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<h1 id="demo-dom-002">Demo DOM 002</h1>
<p>Element mouse, pivot and mimic functionality</p>
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<p><a href="../../demo/dom-002.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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<h4 id="scene-setup">Scene setup</h4>
<p>Create some useful variables for use elsewhere in the script</p>
</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>,
element = artefact.<span class="hljs-property">myelement</span>,
mimic = artefact.<span class="hljs-property">mymimic</span>,
pivot = artefact.<span class="hljs-property">mypivot</span>;</pre></div></div>
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<p>Give the stack element some depth</p>
</div>
<div class="content"><div class='highlight'><pre>stack.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">perspectiveZ</span>: <span class="hljs-number">1200</span>
});</pre></div></div>
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<p>Setup the main element</p>
</div>
<div class="content"><div class='highlight'><pre>element.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">startX</span>: <span class="hljs-number">250</span>,
<span class="hljs-attr">startY</span>: <span class="hljs-number">250</span>,
<span class="hljs-attr">handleX</span>: <span class="hljs-number">125</span>,
<span class="hljs-attr">handleY</span>: <span class="hljs-number">125</span>,
<span class="hljs-attr">width</span>: <span class="hljs-number">250</span>,
<span class="hljs-attr">height</span>: <span class="hljs-number">250</span>,
<span class="hljs-attr">roll</span>: <span class="hljs-number">10</span>,
<span class="hljs-attr">pitch</span>: <span class="hljs-number">20</span>,
<span class="hljs-attr">yaw</span>: <span class="hljs-number">30</span>
});</pre></div></div>
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<p>Setup the mimic element</p>
</div>
<div class="content"><div class='highlight'><pre>mimic.<span class="hljs-title function_">set</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">offsetX</span>: <span class="hljs-number">60</span>,
<span class="hljs-attr">roll</span>: <span class="hljs-number">15</span>,
<span class="hljs-attr">pitch</span>: <span class="hljs-number">15</span>,
<span class="hljs-attr">yaw</span>: <span class="hljs-number">15</span>,
<span class="hljs-attr">mimic</span>: <span class="hljs-string">'myelement'</span>,
<span class="hljs-attr">lockTo</span>: <span class="hljs-string">'mimic'</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">false</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">true</span>,
<span class="hljs-attr">addOwnRotationToMimic</span>: <span class="hljs-literal">false</span>,
});</pre></div></div>
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<li id="section-7">
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</div>
<p>Setup the pivot element</p>
</div>
<div class="content"><div class='highlight'><pre>pivot.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">pivot</span>: <span class="hljs-string">'myelement'</span>,
<span class="hljs-attr">lockTo</span>: <span class="hljs-string">'pivot'</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 check whether mouse cursor is over stack, and lock the element artefact accordingly</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> stackCheck = <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> (stack.<span class="hljs-property">here</span>.<span class="hljs-property">active</span> !== active) {
active = stack.<span class="hljs-property">here</span>.<span class="hljs-property">active</span>;
element.<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>
});
}
};
}();</pre></div></div>
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<li id="section-9">
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</div>
<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">const</span> [width, height] = element.<span class="hljs-property">dimensions</span>;
<span class="hljs-keyword">const</span> [startX, startY] = element.<span class="hljs-property">start</span>;
<span class="hljs-keyword">const</span> [handleX, handleY] = element.<span class="hljs-property">handle</span>;
<span class="hljs-keyword">const</span> lockTo = element.<span class="hljs-property">lockTo</span>.<span class="hljs-title function_">join</span>(<span class="hljs-string">', '</span>);
<span class="hljs-keyword">const</span> {roll, pitch, yaw, scale} = element;
<span class="hljs-keyword">return</span> <span class="hljs-string">` lock to: «<span class="hljs-subst">${lockTo}</span>»
dimensions - width: <span class="hljs-subst">${width}</span>, height: <span class="hljs-subst">${height}</span>
start - x: <span class="hljs-subst">${startX}</span>, y: <span class="hljs-subst">${startY}</span>
handle - x: <span class="hljs-subst">${handleX}</span>, y: <span class="hljs-subst">${handleY}</span>
scale: <span class="hljs-subst">${scale}</span>
roll: <span class="hljs-subst">${roll}</span>°, pitch: <span class="hljs-subst">${pitch}</span>°, yaw: <span class="hljs-subst">${yaw}</span>°`</span>;
});</pre></div></div>
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<li id="section-10">
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</div>
<p>Create the Display cycle animation</p>
</div>
<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">target</span>: stack,
<span class="hljs-attr">commence</span>: stackCheck,
<span class="hljs-attr">afterShow</span>: report,
});</pre></div></div>
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<li id="section-11">
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</div>
<h4 id="user-interaction">User interaction</h4>
<p>For this demo we will suppress touchmove functionality over the canvas; we also need to disable Android magnification gesture - this is done in CSS with <code>touch-action: none;</code> - note: dragging issue does not affect Demo DOM-008</p>
</div>
<div class="content"><div class='highlight'><pre>scrawl.<span class="hljs-title function_">addNativeListener</span>([<span class="hljs-string">'touchmove'</span>], <span class="hljs-function">(<span class="hljs-params">e</span>) =></span> {
e.<span class="hljs-title function_">preventDefault</span>();
e.<span class="hljs-property">returnValue</span> = <span class="hljs-literal">false</span>;
}, stack.<span class="hljs-property">domElement</span>);</pre></div></div>
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<li id="section-12">
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</div>
<p>Setup form observer functionality</p>
</div>
<div class="content"><div class='highlight'><pre>scrawl.<span class="hljs-title function_">observeAndUpdate</span>({
<span class="hljs-attr">event</span>: [<span class="hljs-string">'input'</span>, <span class="hljs-string">'change'</span>],
<span class="hljs-attr">origin</span>: <span class="hljs-string">'.controlItem'</span>,
<span class="hljs-attr">target</span>: element,
<span class="hljs-attr">useNativeListener</span>: <span class="hljs-literal">true</span>,
<span class="hljs-attr">preventDefault</span>: <span class="hljs-literal">true</span>,
<span class="hljs-attr">updates</span>: {
<span class="hljs-attr">dims_widthPercent</span>: [<span class="hljs-string">'width'</span>, <span class="hljs-string">'%'</span>],
<span class="hljs-attr">dims_widthAbsolute</span>: [<span class="hljs-string">'width'</span>, <span class="hljs-string">'round'</span>],
<span class="hljs-attr">dims_heightPercent</span>: [<span class="hljs-string">'height'</span>, <span class="hljs-string">'%'</span>],
<span class="hljs-attr">dims_heightAbsolute</span>: [<span class="hljs-string">'height'</span>, <span class="hljs-string">'round'</span>],
<span class="hljs-attr">start_xPercent</span>: [<span class="hljs-string">'startX'</span>, <span class="hljs-string">'%'</span>],
<span class="hljs-attr">start_xAbsolute</span>: [<span class="hljs-string">'startX'</span>, <span class="hljs-string">'round'</span>],
<span class="hljs-attr">start_xString</span>: [<span class="hljs-string">'startX'</span>, <span class="hljs-string">'raw'</span>],
<span class="hljs-attr">start_yPercent</span>: [<span class="hljs-string">'startY'</span>, <span class="hljs-string">'%'</span>],
<span class="hljs-attr">start_yAbsolute</span>: [<span class="hljs-string">'startY'</span>, <span class="hljs-string">'round'</span>],
<span class="hljs-attr">start_yString</span>: [<span class="hljs-string">'startY'</span>, <span class="hljs-string">'raw'</span>],
<span class="hljs-attr">handle_xPercent</span>: [<span class="hljs-string">'handleX'</span>, <span class="hljs-string">'%'</span>],
<span class="hljs-attr">handle_xAbsolute</span>: [<span class="hljs-string">'handleX'</span>, <span class="hljs-string">'round'</span>],
<span class="hljs-attr">handle_xString</span>: [<span class="hljs-string">'handleX'</span>, <span class="hljs-string">'raw'</span>],
<span class="hljs-attr">handle_yPercent</span>: [<span class="hljs-string">'handleY'</span>, <span class="hljs-string">'%'</span>],
<span class="hljs-attr">handle_yAbsolute</span>: [<span class="hljs-string">'handleY'</span>, <span class="hljs-string">'round'</span>],
<span class="hljs-attr">handle_yString</span>: [<span class="hljs-string">'handleY'</span>, <span class="hljs-string">'raw'</span>],
<span class="hljs-attr">roll</span>: [<span class="hljs-string">'roll'</span>, <span class="hljs-string">'float'</span>],
<span class="hljs-attr">pitch</span>: [<span class="hljs-string">'pitch'</span>, <span class="hljs-string">'float'</span>],
<span class="hljs-attr">yaw</span>: [<span class="hljs-string">'yaw'</span>, <span class="hljs-string">'float'</span>],
<span class="hljs-attr">scale</span>: [<span class="hljs-string">'scale'</span>, <span class="hljs-string">'float'</span>],
},
});</pre></div></div>
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<li id="section-13">
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<a class="ss" href="#section-13">§</a>
</div>
<p><code>target</code> doesn’t have to be a Scrawl-canvas object. We can use the object’s name, though we also have to tell the function where the object lives in the Scrawl-canvas library (usually this will be ‘artefact’)</p>
</div>
<div class="content"><div class='highlight'><pre>scrawl.<span class="hljs-title function_">observeAndUpdate</span>({
<span class="hljs-attr">event</span>: [<span class="hljs-string">'input'</span>, <span class="hljs-string">'change'</span>],
<span class="hljs-attr">origin</span>: <span class="hljs-string">'.controlItem'</span>,
<span class="hljs-attr">target</span>: <span class="hljs-string">'mypivot'</span>,
<span class="hljs-attr">targetLibrarySection</span>: <span class="hljs-string">'artefact'</span>,
<span class="hljs-attr">useNativeListener</span>: <span class="hljs-literal">true</span>,
<span class="hljs-attr">preventDefault</span>: <span class="hljs-literal">true</span>,
<span class="hljs-attr">updates</span>: {
<span class="hljs-attr">pivot_handle</span>: [<span class="hljs-string">'addPivotHandle'</span>, <span class="hljs-string">'boolean'</span>],
<span class="hljs-attr">pivot_rotation</span>: [<span class="hljs-string">'addPivotRotation'</span>, <span class="hljs-string">'boolean'</span>],
},
});</pre></div></div>
</li>
<li id="sectio