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<!doctype html>
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<h1> iching-js</h1>
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<h1 id="iching-js">IChing-JS</h1>
<p>An IChing encoding and decoding library written in typescript for use in javascript-based web apps.</p>
<h2 id="installation">Installation</h2>
<p>Clone the repository and run <code>npm install --no-save</code> followed by <code>npm run build</code>.</p>
<h3 id="node-js">Node.js</h3>
<p>The Node.js files can be found in <code>./lib/esm5</code> after building.</p>
<h3 id="javascript">Javascript</h3>
<p>This library can be used in javascript by including <code>./lib/umd/index.min.js</code> as script source.</p>
<h2 id="usage">Usage</h2>
<h3 id="encoding">Encoding</h3>
<p>IChing-JS library exports a method <code>iching.encode(payload, options?)</code>.</p>
<h4 id="arguments">Arguments</h4>
<ul>
<li><code>payload</code> - A string of alphanumeric characters that is the desired payload of the IChing.</li>
<li><code>options</code> (optional) - Additional options:<ul>
<li><code>ecLevel</code> - Error correction level, a number between 0 and 1 representing the maximum percentage of errors that can be corrected, relative to the payload length. Defaults to <a href="./src/core/encoder/Encoder.ts#L34"><code>Encoder.EC_MEDIUM</code></a> (0.15).</li>
<li><code>resolution</code> - A number representing the width and height of the square image produced by the method. Defaults to 1250.</li>
<li><code>roundEdges</code> - A boolean determining whether the symbols' edges in the output image are straight or round. Defaults to false, which means straight edges.</li>
<li><code>inverted</code> - A boolean determining whether the output image is inverted, i.e. white on black instead of black on white. Defaults to false.</li>
</ul>
</li>
</ul>
<h4 id="return-value">Return Value</h4>
<p>If the encoding process succeeds, the method will return an object that implements the <a href="./src/core/encoder/EncodedIChing.ts"><code>EncodedIChing</code></a> interface.</p>
<h4 id="example">Example</h4>
<p>Example usage with options specified:</p>
<pre><code class="language-javascript"><span class="hljs-keyword">const</span> payload = <span class="hljs-string">"thisisanexample123"</span>;
<span class="hljs-keyword">const</span> options = { <span class="hljs-attr">ecLevel</span>: <span class="hljs-number">0.5</span>, <span class="hljs-attr">resolution</span>: <span class="hljs-number">2000</span>, <span class="hljs-attr">roundEdges</span>: <span class="hljs-literal">true</span>, <span class="hljs-attr">inverted</span>: <span class="hljs-literal">false</span> };
<span class="hljs-keyword">const</span> encoded = iching.encode(payload, options);</code></pre>
<p>Or without options:</p>
<pre><code class="language-javascript"><span class="hljs-keyword">const</span> payload = <span class="hljs-string">"thisisanexample123"</span>;
<span class="hljs-keyword">const</span> encoded = iching.encode(payload);</code></pre>
<p>Which is equivalent to:</p>
<pre><code class="language-javascript"><span class="hljs-keyword">const</span> payload = <span class="hljs-string">"thisisanexample123"</span>;
<span class="hljs-keyword">const</span> defaultOptions = { <span class="hljs-attr">ecLevel</span>: <span class="hljs-number">0.15</span>, <span class="hljs-attr">resolution</span>: <span class="hljs-number">1250</span>, <span class="hljs-attr">roundEdges</span>: <span class="hljs-literal">false</span>, <span class="hljs-attr">inevrted</span>: <span class="hljs-literal">false</span> };
<span class="hljs-keyword">const</span> encoded = iching.encode(payload, defaultOptions);</code></pre>
<p>Image can be displayed using HTML canvas:</p>
<pre><code class="language-javascript"><span class="hljs-comment">// 'cvs' and 'ctx' are an HTML canvas element, and its 2D rendering context, respectively.</span>
<span class="hljs-keyword">const</span> imgData = encoded.imageData;
cvs.width = imgData.width;
cvs.height = imgData.height;
<span class="hljs-keyword">const</span> ctxImgData = <span class="hljs-keyword">new</span> ImageData(imgData.data, imgData.width, imgData.height);
ctx.putImageData(ctxImgData, <span class="hljs-number">0</span>, <span class="hljs-number">0</span>);
<span class="hljs-comment">// If 'img' is an HTML image element, its 'src' attribute can be set like follows:</span>
img.src = cvs.toDataURL();</code></pre>
<h3 id="decoding">Decoding</h3>
<p>IChing-JS library exports a method <code>iching.decode(imageData, width, height)</code>.</p>
<h4 id="arguments">Arguments</h4>
<ul>
<li><code>imageData</code> - A <code>Uint8ClampedArray</code> of RGBA pixel values in the form <code>[r0, g0, b0, a0, r1, g1, b1, a1, ...]</code>. The length of this array should be <code>4 * width * height</code>.</li>
<li><code>width</code> - The width of the image to be decoded.</li>
<li><code>height</code> - The height of the image to be decoded.</li>
</ul>
<h4 id="return-value">Return value</h4>
<p>If the decoding process succeeds, the method will return an object that implements the <a href="./src/core/decoder/DecodedIChing.ts"><code>DecodedIChing</code></a> interface.</p>
<h4 id="example">Example</h4>
<p>Example usage:</p>
<pre><code class="language-javascript"><span class="hljs-comment">// Let 'width' and 'height' be the width and height of the input image, respectively,</span>
<span class="hljs-comment">// and 'imageData' be a Uint8ClampedArray of RGBA pixel values, and of length 4 * width * height.</span>
<span class="hljs-keyword">const</span> decoded = iching.decode(imageData, width, height);
<span class="hljs-built_in">console</span>.log(decoded.version, decoded.size);
<span class="hljs-built_in">console</span>.log(decoded.data);</code></pre>
<h2 id="documentation">Documentation</h2>
<p>Detailed HTML docs can be found <a href="./docs/index.html">here</a>.</p>
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