scrawl-canvas
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<h1 id="star-factory">Star factory</h1>
<p>A factory for generating star shape-based entitys</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>
</div>
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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>
</div>
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<h4 id="demos">Demos:</h4>
<ul>
<li><a href="../../demo/canvas-011.html">Canvas-011</a> - Shape entity (make, clone, method); drag and drop shape entitys</li>
<li><a href="../../demo/canvas-012.html">Canvas-012</a> - Shape entity position; shape entity as a path for other artefacts to follow</li>
<li><a href="../../demo/canvas-013.html">Canvas-013</a> - Path-defined entitys: oval, rectangle, line, quadratic, bezier, tetragon, polygon, star, spiral</li>
<li><a href="../../demo/canvas-014.html">Canvas-014</a> - Line, quadratic and bezier entitys - control lock alternatives</li>
<li><a href="../../demo/canvas-018.html">Canvas-018</a> - Phrase entity - text along a path</li>
<li><a href="../../demo/canvas-024.html">Canvas-024</a> - Loom entity functionality</li>
<li><a href="../../demo/canvas-030.html">Canvas-030</a> - Polyline entity functionality</li>
<li><a href="../../demo/canvas-038.html">Canvas-038</a> - Responsive Shape-based entitys</li>
<li><a href="../../demo/dom-015.html">DOM-015</a> - Use stacked DOM artefact corners as pivot points</li>
<li><a href="../../demo/packets-002.html">Packets-002</a> - Scrawl-canvas packets - save and load a range of different entitys</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 } <span class="hljs-keyword">from</span> <span class="hljs-string">'../core/library.js'</span>;
<span class="hljs-keyword">import</span> { mergeOver, Ωempty } <span class="hljs-keyword">from</span> <span class="hljs-string">'../core/utilities.js'</span>;
<span class="hljs-keyword">import</span> { requestVector, releaseVector } <span class="hljs-keyword">from</span> <span class="hljs-string">'./vector.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="star-constructor">Star constructor</h4>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> <span class="hljs-title class_">Star</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">items = Ωempty</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="star-prototype">Star prototype</h4>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> P = <span class="hljs-title class_">Star</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">'Star'</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="star-attributes">Star 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 = {
<span class="hljs-attr">radius1</span>: <span class="hljs-number">0</span>,
<span class="hljs-attr">radius2</span>: <span class="hljs-number">0</span>,
<span class="hljs-attr">points</span>: <span class="hljs-number">0</span>,
<span class="hljs-attr">twist</span>: <span class="hljs-number">0</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>
<p>No additional packet functionality required</p>
</div>
</li>
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<h4 id="clone-management">Clone management</h4>
<p>No additional clone functionality required</p>
</div>
</li>
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<h4 id="kill-management">Kill management</h4>
<p>No additional kill functionality required</p>
</div>
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<h4 id="get-set-deltaset">Get, Set, deltaSet</h4>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> S = P.<span class="hljs-property">setters</span>,
D = P.<span class="hljs-property">deltaSetters</span>;</pre></div></div>
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<p><strong>radius1</strong>, <strong>radius2</strong></p>
</div>
<div class="content"><div class='highlight'><pre>S.<span class="hljs-property">radius1</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) {
<span class="hljs-variable language_">this</span>.<span class="hljs-property">radius1</span> = item;
<span class="hljs-variable language_">this</span>.<span class="hljs-title function_">updateDirty</span>();
};
D.<span class="hljs-property">radius1</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) {
<span class="hljs-variable language_">this</span>.<span class="hljs-property">radius1</span> += item;
<span class="hljs-variable language_">this</span>.<span class="hljs-title function_">updateDirty</span>();
};
S.<span class="hljs-property">radius2</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) {
<span class="hljs-variable language_">this</span>.<span class="hljs-property">radius2</span> = item;
<span class="hljs-variable language_">this</span>.<span class="hljs-title function_">updateDirty</span>();
};
D.<span class="hljs-property">radius2</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) {
<span class="hljs-variable language_">this</span>.<span class="hljs-property">radius2</span> += item;
<span class="hljs-variable language_">this</span>.<span class="hljs-title function_">updateDirty</span>();
};</pre></div></div>
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<p><strong>points</strong></p>
</div>
<div class="content"><div class='highlight'><pre>S.<span class="hljs-property">points</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) {
<span class="hljs-variable language_">this</span>.<span class="hljs-property">points</span> = item;
<span class="hljs-variable language_">this</span>.<span class="hljs-title function_">updateDirty</span>();
};
D.<span class="hljs-property">points</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) {
<span class="hljs-variable language_">this</span>.<span class="hljs-property">points</span> += item;
<span class="hljs-variable language_">this</span>.<span class="hljs-title function_">updateDirty</span>();
};</pre></div></div>
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<p><strong>twist</strong></p>
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<div class="content"><div class='highlight'><pre>S.<span class="hljs-property">twist</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) {
<span class="hljs-variable language_">this</span>.<span class="hljs-property">twist</span> = item;
<span class="hljs-variable language_">this</span>.<span class="hljs-title function_">updateDirty</span>();
};
D.<span class="hljs-property">twist</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">item</span>) {
<span class="hljs-variable language_">this</span>.<span class="hljs-property">twist</span> += item;
<span class="hljs-variable language_">this</span>.<span class="hljs-title function_">updateDirty</span>();
};</pre></div></div>
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<h4 id="prototype-functions">Prototype functions</h4>
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<p><code>cleanSpecies</code> - internal helper function - called by <code>prepareStamp</code></p>
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<div class="content"><div class='highlight'><pre>P.<span class="hljs-property">cleanSpecies</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">false</span>;
<span class="hljs-keyword">let</span> p = <span class="hljs-string">'M0,0'</span>;
p = <span class="hljs-variable language_">this</span>.<span class="hljs-title function_">makeStarPath</span>();
<span class="hljs-variable language_">this</span>.<span class="hljs-property">pathDefinition</span> = p;
};</pre></div></div>
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<p><code>makeStarPath</code> - internal helper function - called by <code>cleanSpecies</code></p>
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<div class="content"><div class='highlight'><pre>P.<span class="hljs-property">makeStarPath</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) {
<span class="hljs-keyword">let</span> points = <span class="hljs-variable language_">this</span>.<span class="hljs-property">points</span>,
twist = <span class="hljs-variable language_">this</span>.<span class="hljs-property">twist</span>,
radius1 = <span class="hljs-variable language_">this</span>.<span class="hljs-property">radius1</span>,
radius2 = <span class="hljs-variable language_">this</span>.<span class="hljs-property">radius2</span>,
turn = <span class="hljs-number">360</span> / points,
xPts = [],
currentX, currentY, x, y,
myMin, myXoffset, myYoffset, i,
myPath = <span class="hljs-string">''</span>;
<span class="hljs-keyword">if</span> (radius1.<span class="hljs-property">substring</span> || radius2.<span class="hljs-property">substring</span>) {</pre></div></div>
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<p>let here = this.getHere();</p>
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<p>radius1 = (radius1.substring) ? (parseFloat(radius1) / 100) * here.w : radius1;
radius2 = (radius2.substring) ? (parseFloat(radius2) / 100) * here.w : radius2;</p>
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<div class="content"><div class='highlight'><pre>
<span class="hljs-keyword">let</span> host = <span class="hljs-variable language_">this</span>.<span class="hljs-title function_">getHost</span>();
<span class="hljs-keyword">if</span> (host) {
<span class="hljs-keyword">let</span> [hW, hH] = host.<span class="hljs-property">currentDimensions</span>;
radius1 = (radius1.<span class="hljs-property">substring</span>) ? (<span class="hljs-built_in">parseFloat</span>(radius1) / <span class="hljs-number">100</span>) * hW : radius1;
radius2 = (radius2.<span class="hljs-property">substring</span>) ? (<span class="hljs-built_in">parseFloat</span>(radius2) / <span class="hljs-number">100</span>) * hW : radius2;
}
}
<span class="hljs-keyword">let</span> v1 = <span class="hljs-title function_">requestVector</span>({<span class="hljs-attr">x</span>: <span class="hljs-number">0</span>, <span class="hljs-attr">y</span>: -radius1}),
v2 = <span class="hljs-title function_">requestVector</span>({<span class="hljs-attr">x</span>: <span class="hljs-number">0</span>, <span class="hljs-attr">y</span>: -radius2});
currentX = v1.<span class="hljs-property">x</span>;
currentY = v1.<span class="hljs-property">y</span>;
xPts.<span class="hljs-title function_">push</span>(currentX);
v2.<span class="hljs-title function_">rotate</span>(-turn/<span class="hljs-number">2</span>);
v2.<span class="hljs-title function_">rotate</span>(twist);
<span class="hljs-keyword">for</span> (i = <span class="hljs-number">0</span>; i < points; i++) {
v2.<span class="hljs-title function_">rotate</span>(turn);
x = <span class="hljs-built_in">parseFloat</span>((v2.<span class="hljs-property">x</span> - currentX).<span class="hljs-title function_">toFixed</span>(<span class="hljs-number">1</span>));
currentX += x;
xPts.<span class="hljs-title function_">push</span>(currentX);
y = <span class="hljs-built_in">parseFloat</span>((v2.<span class="hljs-property">y</span> - currentY).<span class="hljs-title function_">toFixed</span>(<span class="hljs-number">1</span>));
currentY += y;
myPath += <span class="hljs-string">`<span class="hljs-subst">${x}</span>,<span class="hljs-subst">${y}</span> `</span>;
v1.<span class="hljs-title function_">rotate</span>(turn);
x = <span class="hljs-built_in">parseFloat</span>((v1.<span class="hljs-property">x</span> - currentX).<span class="hljs-title function_">toFixed</span>(<span class="hljs-number">1</span>));
currentX += x;
xPts.<span class="hljs-title function_">push</span>(currentX);
y = <span class="hljs-built_in">parseFloat</span>((v1.<span class="hljs-property">y</span> - currentY).<span class="hljs-title function_">toFixed</span>(<span class="hljs-number">1</span>));
currentY += y;
myPath += <span class="hljs-string">`<span class="hljs-subst">${x}</span>,<span class="hljs-subst">${y}</span> `</span>;
}
<span class="hljs-title function_">releaseVector</span>(v1);
<span class="hljs-title function_">releaseVector</span>(v2);
myMin = <span class="hljs-title class_">Math</span>.<span class="hljs-title function_">min</span>(...xPts);
myXoffset = <span class="hljs-title class_">Math</span>.<span class="hljs-title function_">abs</span>(myMin).<span class="hljs-title function_">toFixed</span>(<span class="hljs-number">1</span>);
myPath = <span class="hljs-string">`m<span class="hljs-subst">${myXoffset}</span>,0l<span class="hljs-subst">${myPath}</span>z`</span>;
<span class="hljs-keyword">return</span> myPath;
};</pre></div></div>
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<h4 id="factories">Factories</h4>
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<h5 id="makestar">makeStar</h5>
<p>Accepts argument with attributes:</p>
<ul>
<li><strong>radius1</strong> (required) - the <em>outer</em> radius representing the distance between the center of the Shape and the tips of its (acute angle) points.</li>
<li><strong>radius2</strong> (required) - the <em>inner</em> radius representing the distance between the center of the Shape and the obtuse angle at the valley between the tips of its (acute angle) points.</li>
<li>… where these radius values are supplied as %Strings, they are calculated as relative to the canvas/cell <em><strong>width</strong></em> value.</li>
<li><strong>points</strong> (required) - a positive integer Number representing the number of points the star will have.</li>
<li><strong>twist</strong> - a float Number representing the degrees by which the star’s second radius will be rotated out of line from its first radius; the default value <code>0</code> will produce a star with all of its sides of equal length and the star’s valleys falling midway between its connecting points.</li>
<li>Note that the use of <em>inner</em> and <em>outer</em> above is purely descriptive: <code>radius2</code> can be larger than <code>radius1</code></li>
</ul>
<pre><code>scrawl.<span class="hljs-title function_">makeStar</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">'5star'</span>,
<span class="hljs-attr">startX</span>: <span class="hljs-number">20</span>,
<span class="hljs-attr">startY</span>: <span class="hljs-number">100</span>,
<span class="hljs-attr">radius1</span>: <span class="hljs-number">80</span>,
<span class="hljs-attr">radius2</span>: <span class="hljs-number">50</span>,
<span class="hljs-attr">points</span>: <span class="hljs-number">5</span>,
<span class="hljs-attr">fillStyle</span>: <span class="hljs-string">'linen'</span>,
<span class="hljs-attr">method</span>: <span class="hljs-string">'fillAndDraw'</span>,
});
</code></pre>
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<div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> makeStar = <span class="hljs-keyword">function</span> (<span class="hljs-params">items</span>) {
<span class="hljs-keyword">if</span> (!items) <span class="hljs-keyword">return</span> <span class="hljs-literal">false</span>;
items.<span class="hljs-property">species</span> = <span class="hljs-string">'star'</span>;
<span class="hljs-keyword">return</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">Star</span>(items);
};
constructors.<span class="hljs-property">Star</span> = <span class="hljs-title class_">Star</span>;</pre></div></div>
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<h4 id="exports">Exports</h4>
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<div class="content"><div class='highlight'><pre><span class="hljs-keyword">export</span> {
makeStar,
};</pre></div></div>
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