scrawl-canvas
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<h1 id="polyline-factory">Polyline factory</h1>
<p>A factory for generating an open or closed line/curve based shape entity, using a set of pins to mark the course the line</p>
<p><em><strong>To be aware - this entity factory is experimental; its API will be subject to short-notice breaking changes as we amend and improve the entity’s functionality</strong></em></p>
<p>Path-defined entitys represent a diverse range of shapes rendered onto a DOM <canvas> element using the Canvas API’s <a href="https://developer.mozilla.org/en-US/docs/Web/API/Path2D">Path2D interface</a>. They use the <a href="../mixin/shapeBasic.html">shapeBasic</a> and <a href="../mixin/shapePathCalculation.html">shapePathCalculation</a> (some also use <a href="../mixin/shapeCurve.html">shapeCurve</a>) mixins to define much of their functionality.</p>
<p>All path-defined entitys can be positioned, cloned, filtered etc:</p>
<ul>
<li>Positioning functionality for the entity is supplied by the <strong>position</strong> mixin, while rendering functionality comes from the <strong>entity</strong> mixin. </li>
<li>Dimensions, however, have little meaning for path-defined entitys - their width and height are determined by their SVG path data Strings; use <code>scale</code> instead.</li>
<li>Path-defined entitys can use CSS color Strings for their fillStyle and strokeStyle values, alongside <strong>Gradient</strong>, <strong>RadialGradient</strong>, <strong>Color</strong> and <strong>Pattern</strong> objects. </li>
<li>They will also accept <strong>Filter</strong> objects.</li>
<li>They can use <strong>Anchor</strong> objects for user navigation. </li>
<li>They can be rendered to the canvas by including them in a <strong>Cell</strong> object’s <strong>Group</strong>. </li>
<li>They can be <strong>animated</strong> directly, or using delta animation, or act as the target for <strong>Tween</strong> animations.</li>
<li>Path-defined entitys can be cloned, and killed.</li>
</ul>
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<h4 id="using-path-defined-entitys-as-scrawl-canvas-paths">Using path-defined entitys as Scrawl-canvas paths</h4>
<p>A path is a track - straight, or curved, or as complex as required - placed across a container which artefacts can use as a source of their positioning data. We can animate an artifact to move along the path:</p>
<ul>
<li>To enable a path-defined entity to be used as a path by other artefacts, set its <code>useAsPath</code> flag to <code>true</code>.</li>
<li>The artefact can then set its <code>path</code> attribute to the path-defined entity’s name-String (or the entity itself), and set its <code>lockTo</code> Array values to <code>"path"</code>.</li>
<li>We position the artefact by setting its <code>pathPosition</code> attribute to a float Number value between <code>0.0 - 1.0</code>, with <code>0</code> being the start of the path, and <code>1</code> being its end.</li>
<li>Path-defined entitys can use other path-defined entitys as a path.</li>
<li>Phrase entitys can use a path to position their text block; they can also use a path to position each letter individually along the path.</li>
<li>Artefacts (and letters) can be rotated so that they match the rotation at that point along the path - <em><strong>tangential rotation</strong></em> by setting their <code>addPathRotation</code> flag to <code>true</code>.</li>
<li>Animate an artefact along the path by either using the artefact’s <code>delta</code> object, or triggering a Tween to perform the movement.</li>
</ul>
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<h4 id="demos">Demos:</h4>
<ul>
<li><a href="../../demo/canvas-030.html">Canvas-030</a> - Polyline entity functionality</li>
<li><a href="../../demo/canvas-032.html">Canvas-032</a> - Freehand drawing</li>
</ul>
</div>
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<h4 id="imports">Imports</h4>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">import</span> { constructors, artefact, particle } <span class="hljs-keyword">from</span> <span class="hljs-string">'../core/library.js'</span>;
<span class="hljs-keyword">import</span> { mergeOver, isa_obj, isa_boolean, pushUnique, xt, xta, removeItem, correctForZero, Ωempty } <span class="hljs-keyword">from</span> <span class="hljs-string">'../core/utilities.js'</span>;
<span class="hljs-keyword">import</span> { makeCoordinate } <span class="hljs-keyword">from</span> <span class="hljs-string">'../factory/coordinate.js'</span>;
<span class="hljs-keyword">import</span> baseMix <span class="hljs-keyword">from</span> <span class="hljs-string">'../mixin/base.js'</span>;
<span class="hljs-keyword">import</span> shapeMix <span class="hljs-keyword">from</span> <span class="hljs-string">'../mixin/shapeBasic.js'</span>;</pre></div></div>
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<h4 id="polyline-constructor">Polyline constructor</h4>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> <span class="hljs-title class_">Polyline</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">items = Ωempty</span>) {
<span class="hljs-variable language_">this</span>.<span class="hljs-property">pins</span> = [];
<span class="hljs-variable language_">this</span>.<span class="hljs-property">currentPins</span> = [];
<span class="hljs-variable language_">this</span>.<span class="hljs-property">controlledLineOffset</span> = <span class="hljs-title function_">makeCoordinate</span>();
<span class="hljs-variable language_">this</span>.<span class="hljs-title function_">shapeInit</span>(items);
<span class="hljs-keyword">return</span> <span class="hljs-variable language_">this</span>;
};</pre></div></div>
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<h4 id="polyline-prototype">Polyline prototype</h4>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> P = <span class="hljs-title class_">Polyline</span>.<span class="hljs-property"><span class="hljs-keyword">prototype</span></span> = <span class="hljs-title class_">Object</span>.<span class="hljs-title function_">create</span>(<span class="hljs-title class_">Object</span>.<span class="hljs-property"><span class="hljs-keyword">prototype</span></span>);
P.<span class="hljs-property">type</span> = <span class="hljs-string">'Polyline'</span>;
P.<span class="hljs-property">lib</span> = <span class="hljs-string">'entity'</span>;
P.<span class="hljs-property">isArtefact</span> = <span class="hljs-literal">true</span>;
P.<span class="hljs-property">isAsset</span> = <span class="hljs-literal">false</span>;</pre></div></div>
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<h4 id="mixins">Mixins</h4>
<ul>
<li><a href="../mixin/base.html">base</a></li>
<li><a href="../mixin/shapeBasic.html">shapeBasic</a></li>
</ul>
</div>
<div class="content"><div class='highlight'><pre>P = <span class="hljs-title function_">baseMix</span>(P);
P = <span class="hljs-title function_">shapeMix</span>(P);</pre></div></div>
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<h4 id="polyline-attributes">Polyline attributes</h4>
<ul>
<li>Attributes defined in the <a href="../mixin/base.html">base mixin</a>: <strong>name</strong>.</li>
<li>Attributes defined in the <a href="../mixin/position.html">position mixin</a>: <strong>group, visibility, order, calculateOrder, stampOrder, start, <em>startX</em>, <em>startY</em>, handle, <em>handleX</em>, <em>handleY</em>, offset, <em>offsetX</em>, <em>offsetY</em>, dimensions, <em>width</em>, <em>height</em>, pivoted, mimicked, lockTo, <em>lockXTo</em>, <em>lockYTo</em>, scale, roll, noUserInteraction, noPositionDependencies, noCanvasEngineUpdates, noFilters, noPathUpdates, purge, bringToFrontOnDrag</strong>.</li>
<li>Attributes defined in the <a href="../mixin/delta.html">delta mixin</a>: <strong>delta, noDeltaUpdates</strong>.</li>
<li>Attributes defined in the <a href="../mixin/pivot.html">pivot mixin</a>: <strong>pivot, pivotCorner, addPivotHandle, addPivotOffset, addPivotRotation</strong>.</li>
<li>Attributes defined in the <a href="../mixin/mimic.html">mimic mixin</a>: <strong>mimic, useMimicDimensions, useMimicScale, useMimicStart, useMimicHandle, useMimicOffset, useMimicRotation, useMimicFlip, addOwnDimensionsToMimic, addOwnScaleToMimic, addOwnStartToMimic, addOwnHandleToMimic, addOwnOffsetToMimic, addOwnRotationToMimic</strong>.</li>
<li>Attributes defined in the <a href="../mixin/path.html">path mixin</a>: <strong>path, pathPosition, addPathHandle, addPathOffset, addPathRotation, constantPathSpeed</strong>.</li>
<li>Attributes defined in the <a href="../mixin/entity.html">entity mixin</a>: <strong>method, pathObject, winding, flipReverse, flipUpend, scaleOutline, lockFillStyleToEntity, lockStrokeStyleToEntity, onEnter, onLeave, onDown, onUp, <em>fillStyle, strokeStyle, globalAlpha, globalCompositeOperation, lineWidth, lineCap, lineJoin, lineDash, lineDashOffset, miterLimit, shadowOffsetX, shadowOffsetY, shadowBlur, shadowColor, filter</em></strong>.</li>
<li>Attributes defined in the <a href="../mixin/anchor.html">anchor mixin</a>: <strong>anchor</strong>.</li>
<li>Attributes defined in the <a href="../mixin/filter.html">filter mixin</a>: <strong>filters, isStencil</strong>.</li>
<li>Attributes defined in the <a href="../mixin/shapeBasic.html">shapeBasic mixin</a>: <strong>species, useAsPath, precision, pathDefinition, showBoundingBox, boundingBoxColor, minimumBoundingBoxDimensions, constantPathSpeed</strong>.</li>
</ul>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> defaultAttributes = {</pre></div></div>
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<p>The <strong>pins</strong> attribute takes an array with elements which are:</p>
<ul>
<li>[x, y] coordinate arrays, where values can be absolute (Numbers) and/or relative (String%) values</li>
<li>Artefact objects, or their name-String values</li>
<li>(<code>set</code> function will also accept an object with attributes: <code>index, x, y</code> - to be used by Tweens)</li>
</ul>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-attr">pins</span>: <span class="hljs-literal">null</span>,</pre></div></div>
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<p><strong>tension</strong> - gives us the curviness of the line:</p>
<ul>
<li>0 - straight lines connecting the pins</li>
<li>0.4ish - reasonable looking curves</li>
<li>1 - exaggerated curves</li>
<li>negative values - add loops at the pins</li>
</ul>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-attr">tension</span>: <span class="hljs-number">0</span>,</pre></div></div>
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<p><strong>closed</strong> - whether to connect all the pins (true), or run from first to last pin only (false)</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-attr">closed</span>: <span class="hljs-literal">false</span>,
<span class="hljs-attr">mapToPins</span>: <span class="hljs-literal">false</span>,</pre></div></div>
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<p><strong>useParticlesAsPins</strong> - when true, all pins should map directly to Particle objects (as supplied in a Net entity)</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-attr">useParticlesAsPins</span>: <span class="hljs-literal">false</span>,
};
P.<span class="hljs-property">defs</span> = <span class="hljs-title function_">mergeOver</span>(P.<span class="hljs-property">defs</span>, defaultAttributes);</pre></div></div>
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<h4 id="packet-management">Packet management</h4>
</div>
<div class="content"><div class='highlight'><pre>P.<span class="hljs-property">packetExclusions</span> = <span class="hljs-title function_">pushUnique</span>(P.<span class="hljs-property">packetExclusions</span>, [<span class="hljs-string">'controlledLineOffset'</span>]);
P.<span class="hljs-property">packetExclusionsByRegex</span> = <span class="hljs-title function_">pushUnique</span>(P.<span class="hljs-property">packetExclusionsByRegex</span>, []);
P.<span class="hljs-property">packetCoordinates</span> = <span class="hljs-title function_">pushUnique</span>(P.<span class="hljs-property">packetCoordinates</span>, []);
P.<span class="hljs-property">packetObjects</span> = <span class="hljs-title function_">pushUnique</span>(P.<span class="hljs-property">packetObjects</span>, []);
P.<span class="hljs-property">packetFunctions</span> = <span class="hljs-title function_">pushUnique</span>(P.<span class="hljs-property">packetFunctions</span>, []);
P.<span class="hljs-property">finalizePacketOut</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">copy, items</span>) {
<span class="hljs-keyword">let</span> stateCopy = <span class="hljs-title class_">JSON</span>.<span class="hljs-title function_">parse</span>(<span class="hljs-variable language_">this</span>.<span class="hljs-property">state</span>.<span class="hljs-title function_">saveAsPacket</span>(items))[<span class="hljs-number">3</span>];
copy = <span class="hljs-title function_">mergeOver</span>(copy, stateCopy);
copy = <span class="hljs-variable language_">this</span>.<span class="hljs-title function_">handlePacketAnchor</span>(copy, items);
<span class="hljs-title class_">Object</span>.<span class="hljs-title function_">keys</span>(copy).<span class="hljs-title function_">forEach</span>(<span class="hljs-function"><span class="hljs-params">key</span> =></span> {
<span class="hljs-keyword">if</span> (key === <span class="hljs-string">'pins'</span>) {
<span class="hljs-keyword">let</span> temp = [];
copy.<span class="hljs-property">pins</span>.<span class="hljs-title function_">forEach</span>(<span class="hljs-function"><span class="hljs-params">pin</span> =></span> {
<span class="hljs-keyword">if</span> (<span class="hljs-title function_">isa_obj</span>(pin)) temp.<span class="hljs-title function_">push</span>(pin.<span class="hljs-property">name</span>);
<span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (<span class="hljs-title class_">Array</span>.<span class="hljs-title function_">isArray</span>(pin)) temp.<span class="hljs-title function_">push</span>([].<span class="hljs-title function_">concat</span>(pin));
<span class="hljs-keyword">else</span> temp.<span class="hljs-title function_">push</span>(pin);
});
copy.<span class="hljs-property">pins</span> = temp;
}
});
<span class="hljs-keyword">return</span> copy;
};</pre></div></div>
</li>
<li id="section-14">
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<a class="ss" href="#section-14">§</a>
</div>
<h4 id="clone-management">Clone management</h4>
<p>No additional clone functionality required</p>
</div>
</li>
<li id="section-15">
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<a class="ss" href="#section-15">§</a>
</div>
<h4 id="kill-management">Kill management</h4>
<p>No additional kill functionality required</p>
</div>
</li>
<li id="section-16">
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</div>
<h4 id="get-set-deltaset">Get, Set, deltaSet</h4>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> G = P.<span class="hljs-property">getters</span>,
S = P.<span class="hljs-property">setters</span>,
D = P.<span class="hljs-property">deltaSetters</span>;
G.<span class="hljs-property">pins</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) {
<span class="hljs-keyword">if</span> (<span class="hljs-title function_">xt</span>(item)) <span class="hljs-keyword">return</span> <span class="hljs-variable language_">this</span>.<span class="hljs-title function_">getPinAt</span>(item);
<span class="hljs-keyword">return</span> <span class="hljs-variable language_">this</span>.<span class="hljs-property">currentPins</span>.<span class="hljs-title function_">concat</span>();
};
S.<span class="hljs-property">pins</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) {
<span class="hljs-keyword">if</span> (<span class="hljs-title function_">xt</span>(item)) {
<span class="hljs-keyword">let</span> pins = <span class="hljs-variable language_">this</span>.<span class="hljs-property">pins</span>;
<span class="hljs-keyword">if</span> (<span class="hljs-title class_">Array</span>.<span class="hljs-title function_">isArray</span>(item)) {
pins.<span class="hljs-title function_">forEach</span>(<span class="hljs-function">(<span class="hljs-params">item, index</span>) =></span> <span class="hljs-variable language_">this</span>.<span class="hljs-title function_">removePinAt</span>(index));
pins.<span class="hljs-property">length</span> = <span class="hljs-number">0</span>;
pins.<span class="hljs-title function_">push</span>(...item);
<span class="hljs-variable language_">this</span>.<span class="hljs-title function_">updateDirty</span>();
}
<span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (<span class="hljs-title function_">isa_obj</span>(item) && <span class="hljs-title function_">xt</span>(item.<span class="hljs-property">index</span>)) {
<span class="hljs-keyword">let</span> element = pins[item.<span class="hljs-property">index</span>];
<span class="hljs-keyword">if</span> (<span class="hljs-title class_">Array</span>.<span class="hljs-title function_">isArray</span>(element)) {
<span class="hljs-keyword">if</span> (<span class="hljs-title function_">xt</span>(item.<span class="hljs-property">x</span>)) element[<span class="hljs-number">0</span>] = item.<span class="hljs-property">x</span>;
<span class="hljs-keyword">if</span> (<span class="hljs-title function_">xt</span>(item.<span class="hljs-property">y</span>)) element[<span class="hljs-number">1</span>] = item.<span class="hljs-property">y</span>;
<span class="hljs-variable language_">this</span>.<span class="hljs-title function_">updateDirty</span>();
}
}
}
};
D.<span class="hljs-property">pins</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) {
<span class="hljs-keyword">if</span> (<span class="hljs-title function_">xt</span>(item)) {
<span class="hljs-keyword">let</span> pins = <span class="hljs-variable language_">this</span>.<span class="hljs-property">pins</span>;
<span class="hljs-keyword">if</span> (<span class="hljs-title function_">isa_obj</span>(item) && <span class="hljs-title function_">xt</span>(item.<span class="hljs-property">index</span>)) {
<span class="hljs-keyword">let</span> element = pins[item.<span class="hljs-property">index</span>];
<span class="hljs-keyword">if</span> (<span class="hljs-title class_">Array</span>.<span class="hljs-title function_">isArray</span>(element)) {
<span class="hljs-keyword">if</span> (<span class="hljs-title function_">xt</span>(item.<span class="hljs-property">x</span>)) element[<span class="hljs-number">0</span>] = <span class="hljs-title function_">addStrings</span>(element[<span class="hljs-number">0</span>], item.<span class="hljs-property">x</span>);
<span class="hljs-keyword">if</span> (<span class="hljs-title function_">xt</span>(item.<span class="hljs-property">y</span>)) element[<span class="hljs-number">1</span>] = <span class="hljs-title function_">addStrings</span>(element[<span class="hljs-number">1</span>], item.<span class="hljs-property">y</span>);
<span class="hljs-variable language_">this</span>.<span class="hljs-title function_">updateDirty</span>();
}
}
}
};
S.<span class="hljs-property">tension</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) {
<span class="hljs-keyword">if</span> (item.<span class="hljs-property">toFixed</span>) {
<span class="hljs-variable language_">this</span>.<span class="hljs-property">tension</span> = item;
<span class="hljs-variable language_">this</span>.<span class="hljs-title function_">updateDirty</span>();
}
};
D.<span class="hljs-property">tension</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) {
<span class="hljs-keyword">if</span> (item.<span class="hljs-property">toFixed</span>) {
<span class="hljs-variable language_">this</span>.<span class="hljs-property">tension</span> += item;
<span class="hljs-variable language_">this</span>.<span class="hljs-title function_">updateDirty</span>();
}
};
S.<span class="hljs-property">closed</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) {
<span class="hljs-variable language_">this</span>.<span class="hljs-property">closed</span> = item;
<span class="hljs-variable language_">this</span>.<span class="hljs-title function_">updateDirty</span>();
};
S.<span class="hljs-property">mapToPins</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) {
<span class="hljs-variable language_">this</span>.<span class="hljs-property">mapToPins</span> = item;
<span class="hljs-variable language_">this</span>.<span class="hljs-title function_">updateDirty</span>();
};</pre></div></div>
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<li id="section-17">
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<p><strong>flipUpend</strong></p>
</div>
<div class="content"><div class='highlight'><pre>S.<span class="hljs-property">flipUpend</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) {
<span class="hljs-variable language_">this</span>.<span class="hljs-property">flipUpend</span> = item;
<span class="hljs-variable language_">this</span>.<span class="hljs-title function_">updateDirty</span>();
};</pre></div></div>
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</div>
<p><strong>flipReverse</strong></p>
</div>
<div class="content"><div class='highlight'><pre>S.<span class="hljs-property">flipReverse</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) {
<span class="hljs-variable language_">this</span>.<span class="hljs-property">flipReverse</span> = item;
<span class="hljs-variable language_">this</span>.<span class="hljs-title function_">updateDirty</span>();
};</pre></div></div>
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</div>
<p><strong>flipReverse</strong></p>
</div>
<div class="content"><div class='highlight'><pre>S.<span class="hljs-property">useAsPath</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) {
<span class="hljs-variable language_">this</span>.<span class="hljs-property">useAsPath</span> = item;
<span class="hljs-variable language_">this</span>.<span class="hljs-title function_">updateDirty</span>();
};</pre></div></div>
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<li id="section-20">
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</div>
<p><strong>pivot</strong></p>
</div>
<div class="content"><div class='highlight'><pre>S.<span class="hljs-property">pivot</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) {
<span class="hljs-keyword">if</span> (<span class="hljs-title function_">isa_boolean</span>(item) && !item) {
<span class="hljs-variable language_">this</span>.<span class="hljs-property">pivot</span> = <span class="hljs-literal">null</span>;
<span class="hljs-keyword">if</span> (<span class="hljs-variable language_">this</span>.<span class="hljs-property">lockTo</span>[<span class="hljs-number">0</span>] === <span class="hljs-string">'pivot'</span>) <span class="hljs-variable language_">this</span>.<span class="hljs-property">lockTo</span>[<span class="hljs-number">0</span>] = <span class="hljs-string">'start'</span>;
<span class="hljs-keyword">if</span> (<span class="hljs-variable language_">this</span>.<span class="hljs-property">lockTo</span>[<span class="hljs-number">1</span>] === <span class="hljs-string">'pivot'</span>) <span class="hljs-variable language_">this</span>.<span class="hljs-property">lockTo</span>[<span class="hljs-number">1</span>] = <span class="hljs-string">'start'</span>;
<span class="hljs-variable language_">this</span>.<span class="hljs-property">dirtyStampPositions</span> = <span class="hljs-literal">true</span>;
<span class="hljs-variable language_">this</span>.<span class="hljs-property">dirtyStampHandlePositions</span> = <span class="hljs-literal">true</span>;
}
<span class="hljs-keyword">else</span> {
<span class="hljs-keyword">let</span> oldPivot = <span class="hljs-variable language_">this</span>.<span class="hljs-property">pivot</span>,
newPivot = (item.<span class="hljs-property">substring</span>) ? artefact[item] : item,
name = <span class="hljs-variable language_">this</span>.<span class="hljs-property">name</span>;
<span class="hljs-keyword">if</span> (newPivot && newPivot.<span class="hljs-property">name</span>) {
<span class="hljs-keyword">if</span> (oldPivot && oldPivot.<span class="hljs-property">name</span> !== newPivot.<span class="hljs-property">name</span>) <span class="hljs-title function_">removeItem</span>(oldPivot.<span class="hljs-property">pivoted</span>, name);
<span class="hljs-title function_">pushUnique</span>(newPivot.<span class="hljs-property">pivoted</span>, name);
<span class="hljs-variable language_">this</span>.<span class="hljs-property">pivot</span> = newPivot;
<span class="hljs-variable language_">this</span>.<span class="hljs-property">dirtyStampPositions</span> = <span class="hljs-literal">true</span>;
<span class="hljs-variable language_">this</span>.<span class="hljs-property">dirtyStampHandlePositions</span> = <span class="hljs-literal">true</span>;
}
}
<span class="hljs-variable language_">this</span>.<span class="hljs-title function_">updateDirty</span>();
};</pre></div></div>
</li>
<li id="section-21">
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</div>
<h4 id="prototype-functions">Prototype functions</h4>
</div>
</li>
<li id="section-22">
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</div>
<p><code>updateDirty</code> - internal setter helper function</p>
</div>
<div class="content"><div class='highlight'><pre>P.<span class="hljs-property">updateDirty</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) {
<span class="hljs-variable language_">this</span>.<span class="hljs-property">dirtySpecies</span> = <span class="hljs-literal">true</span>;
<span class="hljs-variable language_">this</span>.<span class="hljs-property">dirtyPathObject</span> = <span class="hljs-literal">true</span>;
<span class="hljs-variable language_">this</span>.<span class="hljs-property">dirtyPins</span> = <span class="hljs-literal">true</span>;
};</pre></div></div>
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<li id="section-23">
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</div>
<p><code>getPinAt</code> - </p>
</div>
<div class="content"><div class='highlight'><pre>P.<span class="hljs-property">getPinAt</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">index</span>) {
<span class="hljs-keyword">let</span> i = <span class="hljs-title class_">Math</span>.<span class="hljs-title function_">floor</span>(index);
<span class="hljs-keyword">if</span> (<span class="hljs-variable language_">this</span>.<span class="hljs-property">useAsPath</span>) {
<span class="hljs-keyword">let</span> pos = <span class="hljs-variable language_">this</span>.<span class="hljs-title function_">getPathPositionData</span>(<span class="hljs-variable language_">this</span>.<span class="hljs-property">unitPartials</span>[i]);
<span class="hljs-keyword">return</span> [pos.<span class="hljs-property">x</span>, pos.<span class="hljs-property">y</span>];
}
<span class="hljs-keyword">else</span> {
<span class="hljs-keyword">let</span> pins = <span class="hljs-variable language_">this</span>.<span class="hljs-property">currentPins</span>,
pin = pins[i];
<span class="hljs-keyword">let</span> [x, y, w, h] = <span class="hljs-variable language_">this</span>.<span class="hljs-property">localBox</span>;
<span class="hljs-keyword">let</span> [px, py] = pin;
<span class="hljs-keyword">let</span> [ox, oy] = pins[<span class="hljs-number">0</span>];
<span class="hljs-keyword">let</span> [lx, ly] = <span class="hljs-variable language_">this</span>.<span class="hljs-property">localOffset</span>;
<span class="hljs-keyword">let</span> [sx, sy] = <span class="hljs-variable language_">this</span>.<span class="hljs-property">currentStampPosition</span>;
<span class="hljs-keyword">let</span> dx, dy