agentscript/docs/RGBDataSet.js.html at master · backspaces/agentscript · GitHub

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id="eed4d2a0bfd64539bb9df78095dec881"></div></div></div><div class="body-wrapper"><div class="main-content"><div class="main-wrapper"><section id="source-page" class="source-page"><header><h1 id="title" class="has-anchor">RGBDataSet.js</h1></header><article><pre class="prettyprint source lang-js"><code>import * as util from './utils.js'
import DataSet from './DataSet.js'

// See TileData.js for several rgbToData functions
// as well as their use with several tile servers

/**
 * Class for converting an image to a DataSet.
 *
 * @class
 * @extends DataSet
 */
class RGBDataSet extends DataSet {
 /**
 * Convert an r,g,b triple into an integer
 * @param {number} r Red value, integer in [0,255]
 * @param {number} g Green value, integer in [0,255]
 * @param {number} b Blue value, integer in [0,255]
 * @returns {number} A 24 bit integer
 */
 static rgbToInt24(r, g, b) {
 return r * 256 * 256 + g * 256 + b
 }

 /**
 * As above with min/scale
 * @param {number} min The min return value
 * @param {number} scale The scale factor
 * @returns {number} A 24 bit integer
 */
 static rgbScaleFunction(min, scale) {
 return (r, g, b) => min + rgbToInt24(r, g, b) * scale
 // return (r, g, b) => min + (r * 256 * 256 + g * 256 + b) * scale
 }

 // Constructor args: (img, rgbToData, ArrayType)
 // where rgbToData(r,g,b) returns a number for the dataset.
 /**
 * Create a {@link DataSet} from image pixel data
 * @param {Image} img Any "imagable" object that can be drawn to a canvas
 * @param {function} rgbToData Fnction converting 3 r,g,b bytes to a number
 * @param {constructor} ArrayType A TypedArray or Array. (default Float32)
 */
 constructor(
 img,
 rgbToData = RGBDataSet.rgbToInt24,
 ArrayType = Float32Array
 ) {
 // const [width, height] = util.imageSize(img)
 const { width, height } = img
 super(width, height, new ArrayType(width * height))
 // super(img.width, img.height, new ArrayType(img.width * img.height))

 // Not used or defined anywhere!
 // if (Array.isArray(rgbToData))
 // rgbToData = RGBDataSet.newRgbDataFunction(rgbToData)

 // const ctx = util.createCtx(img.width, img.height)
 // util.fillCtxWithImage(ctx, img)
 const ctx = util.imageToCtx(img)
 const imgData = util.ctxImageData(ctx)

 const convertedData = this.data
 for (var i = 0; i &lt; convertedData.length; i++) {
 const r = imgData.data[4 * i]
 const g = imgData.data[4 * i + 1]
 const b = imgData.data[4 * i + 2]
 convertedData[i] = rgbToData(r, g, b)
 }
 }
}

export default RGBDataSet
</code></pre></article></section><footerclass="footer" id="PeOAagUepe"><divclass="wrapper">AgentScript version: 0.10.20 using clean-jsdoc-theme</div></footer></div></div></div><divclass="search-container" id="PkfLWpAbet" style="display:none"><divclass="wrapper" id="iCxFxjkHbP"><buttonclass="icon-button search-close-button" id="VjLlGakifb" aria-label="close search"><svg><usexlink:href="#close-icon"></use></svg></button><divclass="search-box-c"><svg><usexlink:href="#search-icon"></use></svg><inputtype="text" id="vpcKVYIppa" class="search-input" placeholder="Search..." autofocus></div><divclass="search-result-c" id="fWwVHRuDuN"><spanclass="search-result-c-text">Type anything to view search result</span></div></div></div><divclass="mobile-menu-icon-container"><buttonclass="icon-button" id="mobile-menu" data-isopen="false" aria-label="menu"><svg><usexlink:href="#menu-icon"></use></svg></button></div><divid="mobile-sidebar" class="mobile-sidebar-container"><divclass="mobile-sidebar-wrapper"><ahref="/" class="sidebar-title sidebar-title-anchor">Home</a><divclass="mobile-nav-links"><divclass="navbar-item"><aid="github-mobile" href="https://github.com/backspaces/agentscript" target="">Github</a></div><divclass="navbar-item"><aid="AgentScript-mobile" href="https://agentscript.org" target="">AgentScript.org</a></div><divclass="navbar-item"><aid="npm-mobile" href="https://www.npmjs.com/package/agentscript" target="">npm</a></div><divclass="navbar-item"><aid="unpkg-mobile" href="https://unpkg.com/browse/agentscript/" target="">unpkg</a></div></div><divclass="mobile-sidebar-items-c"><divclass="sidebar-section-title with-arrow" data-isopen="false" id="sidebar-classes"><div>Classes</div><svg><usexlink:href="#down-icon"></use></svg></div><divclass="sidebar-section-children-container"><divclass="sidebar-section-children"><ahref="AgentArray.html">AgentArray</a></div><divclass="sidebar-section-children"><ahref="AgentList.html">AgentList</a></div><divclass="sidebar-section-children"><ahref="AgentSet.html">AgentSet</a></div><divclass="sidebar-section-children"><ahref="Animator.html">Animator</a></div><divclass="sidebar-section-children"><ahref="DataSet.html">DataSet</a></div><divclass="sidebar-section-children"><ahref="GUI.html">GUI</a></div><divclass="sidebar-section-children"><ahref="GeoDataSet.html">GeoDataSet</a></div><divclass="sidebar-section-children"><ahref="Keyboard.html">Keyboard</a></div><divclass="sidebar-section-children"><ahref="Link.html">Link</a></div><divclass="sidebar-section-children"><ahref="Links.html">Links</a></div><divclass="sidebar-section-children"><ahref="Model.html">Model</a></div><divclass="sidebar-section-children"><ahref="Model3D.html">Model3D</a></div><divclass="sidebar-section-children"><ahref="Mouse.html">Mouse</a></div><divclass="sidebar-section-children"><ahref="Patch.html">Patch</a></div><divclass="sidebar-section-children"><ahref="Patches.html">Patches</a></div><divclass="sidebar-section-children"><ahref="RGBDataSet.html">RGBDataSet</a></div><divclass="sidebar-section-children"><ahref="ThreeDraw.html">ThreeDraw</a></div><divclass="sidebar-section-children"><ahref="Turtle.html">Turtle</a></div><divclass="sidebar-section-children"><ahref="Turtle3D.html">Turtle3D</a></div><divclass="sidebar-section-children"><ahref="Turtles.html">Turtles</a></div><divclass="sidebar-section-children"><ahref="TwoDraw.html">TwoDraw</a></div><divclass="sidebar-section-children"><ahref="World.html">World</a></div></div><divclass="sidebar-section-title with-arrow" data-isopen="false" id="sidebar-modules"><div>Modules</div><svg><usexlink:href="#down-icon"></use></svg></div><divclass="sidebar-section-children-container"><divclass="sidebar-section-children"><ahref="module-src_geojson.html">src/geojson</a></div><divclass="sidebar-section-children"><ahref="module-src_gis.html">src/gis</a></div><divclass="sidebar-section-children"><ahref="module-src_utils.html">src/utils</a></div></div><divclass="sidebar-section-title with-arrow" data-isopen="false" id="sidebar-tutorials"><div>Tutorials</div><svg><usexlink:href="#down-icon"></use></svg></div><divclass="sidebar-section-children-container"><divclass="sidebar-section-children"><ahref="tutorial-1 - 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