agentscript

<!DOCTYPE html><html lang="en" style="font-size:16px"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1"><link rel="icon" href="../favicon.ico"><title>Source: DataSet.js</title><script src="scripts/third-party/hljs.js" defer="defer"></script><script src="scripts/third-party/hljs-line-num.js" defer="defer"></script><script src="scripts/third-party/popper.js" defer="defer"></script><script src="scripts/third-party/tippy.js" defer="defer"></script><script src="scripts/third-party/tocbot.min.js"></script><script>var baseURL="/",locationPathname="";baseURL=(locationPathname=document.location.pathname).substr(0,locationPathname.lastIndexOf("/")+1)</script><link rel="stylesheet" href="styles/clean-jsdoc-theme.min.css"><svg aria-hidden="true" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" style="display:none"><defs><symbol id="copy-icon" viewbox="0 0 488.3 488.3"><g><path d="M314.25,85.4h-227c-21.3,0-38.6,17.3-38.6,38.6v325.7c0,21.3,17.3,38.6,38.6,38.6h227c21.3,0,38.6-17.3,38.6-38.6V124 C352.75,102.7,335.45,85.4,314.25,85.4z M325.75,449.6c0,6.4-5.2,11.6-11.6,11.6h-227c-6.4,0-11.6-5.2-11.6-11.6V124 c0-6.4,5.2-11.6,11.6-11.6h227c6.4,0,11.6,5.2,11.6,11.6V449.6z"/><path d="M401.05,0h-227c-21.3,0-38.6,17.3-38.6,38.6c0,7.5,6,13.5,13.5,13.5s13.5-6,13.5-13.5c0-6.4,5.2-11.6,11.6-11.6h227 c6.4,0,11.6,5.2,11.6,11.6v325.7c0,6.4-5.2,11.6-11.6,11.6c-7.5,0-13.5,6-13.5,13.5s6,13.5,13.5,13.5c21.3,0,38.6-17.3,38.6-38.6 V38.6C439.65,17.3,422.35,0,401.05,0z"/></g></symbol><symbol id="search-icon" viewBox="0 0 512 512"><g><g><path d="M225.474,0C101.151,0,0,101.151,0,225.474c0,124.33,101.151,225.474,225.474,225.474 c124.33,0,225.474-101.144,225.474-225.474C450.948,101.151,349.804,0,225.474,0z M225.474,409.323 c-101.373,0-183.848-82.475-183.848-183.848S124.101,41.626,225.474,41.626s183.848,82.475,183.848,183.848 S326.847,409.323,225.474,409.323z"/></g></g><g><g><path d="M505.902,476.472L386.574,357.144c-8.131-8.131-21.299-8.131-29.43,0c-8.131,8.124-8.131,21.306,0,29.43l119.328,119.328 c4.065,4.065,9.387,6.098,14.715,6.098c5.321,0,10.649-2.033,14.715-6.098C514.033,497.778,514.033,484.596,505.902,476.472z"/></g></g></symbol><symbol id="font-size-icon" viewBox="0 0 24 24"><path fill="none" d="M0 0h24v24H0z"/><path d="M11.246 15H4.754l-2 5H.6L7 4h2l6.4 16h-2.154l-2-5zm-.8-2L8 6.885 5.554 13h4.892zM21 12.535V12h2v8h-2v-.535a4 4 0 1 1 0-6.93zM19 18a2 2 0 1 0 0-4 2 2 0 0 0 0 4z"/></symbol><symbol id="add-icon" viewBox="0 0 24 24"><path fill="none" d="M0 0h24v24H0z"/><path d="M11 11V5h2v6h6v2h-6v6h-2v-6H5v-2z"/></symbol><symbol id="minus-icon" viewBox="0 0 24 24"><path fill="none" d="M0 0h24v24H0z"/><path d="M5 11h14v2H5z"/></symbol><symbol id="dark-theme-icon" viewBox="0 0 24 24"><path fill="none" d="M0 0h24v24H0z"/><path d="M10 7a7 7 0 0 0 12 4.9v.1c0 5.523-4.477 10-10 10S2 17.523 2 12 6.477 2 12 2h.1A6.979 6.979 0 0 0 10 7zm-6 5a8 8 0 0 0 15.062 3.762A9 9 0 0 1 8.238 4.938 7.999 7.999 0 0 0 4 12z"/></symbol><symbol id="light-theme-icon" viewBox="0 0 24 24"><path fill="none" d="M0 0h24v24H0z"/><path d="M12 18a6 6 0 1 1 0-12 6 6 0 0 1 0 12zm0-2a4 4 0 1 0 0-8 4 4 0 0 0 0 8zM11 1h2v3h-2V1zm0 19h2v3h-2v-3zM3.515 4.929l1.414-1.414L7.05 5.636 5.636 7.05 3.515 4.93zM16.95 18.364l1.414-1.414 2.121 2.121-1.414 1.414-2.121-2.121zm2.121-14.85l1.414 1.415-2.121 2.121-1.414-1.414 2.121-2.121zM5.636 16.95l1.414 1.414-2.121 2.121-1.414-1.414 2.121-2.121zM23 11v2h-3v-2h3zM4 11v2H1v-2h3z"/></symbol><symbol id="reset-icon" viewBox="0 0 24 24"><path fill="none" d="M0 0h24v24H0z"/><path d="M18.537 19.567A9.961 9.961 0 0 1 12 22C6.477 22 2 17.523 2 12S6.477 2 12 2s10 4.477 10 10c0 2.136-.67 4.116-1.81 5.74L17 12h3a8 8 0 1 0-2.46 5.772l.997 1.795z"/></symbol><symbol id="down-icon" viewBox="0 0 16 16"><path fill-rule="evenodd" clip-rule="evenodd" d="M12.7803 6.21967C13.0732 6.51256 13.0732 6.98744 12.7803 7.28033L8.53033 11.5303C8.23744 11.8232 7.76256 11.8232 7.46967 11.5303L3.21967 7.28033C2.92678 6.98744 2.92678 6.51256 3.21967 6.21967C3.51256 5.92678 3.98744 5.92678 4.28033 6.21967L8 9.93934L11.7197 6.21967C12.0126 5.92678 12.4874 5.92678 12.7803 6.21967Z"></path></symbol><symbol id="codepen-icon" viewBox="0 0 24 24"><path fill="none" d="M0 0h24v24H0z"/><path d="M16.5 13.202L13 15.535v3.596L19.197 15 16.5 13.202zM14.697 12L12 10.202 9.303 12 12 13.798 14.697 12zM20 10.869L18.303 12 20 13.131V10.87zM19.197 9L13 4.869v3.596l3.5 2.333L19.197 9zM7.5 10.798L11 8.465V4.869L4.803 9 7.5 10.798zM4.803 15L11 19.131v-3.596l-3.5-2.333L4.803 15zM4 13.131L5.697 12 4 10.869v2.262zM2 9a1 1 0 0 1 .445-.832l9-6a1 1 0 0 1 1.11 0l9 6A1 1 0 0 1 22 9v6a1 1 0 0 1-.445.832l-9 6a1 1 0 0 1-1.11 0l-9-6A1 1 0 0 1 2 15V9z"/></symbol><symbol id="close-icon" viewBox="0 0 24 24"><path fill="none" d="M0 0h24v24H0z"/><path d="M12 10.586l4.95-4.95 1.414 1.414-4.95 4.95 4.95 4.95-1.414 1.414-4.95-4.95-4.95 4.95-1.414-1.414 4.95-4.95-4.95-4.95L7.05 5.636z"/></symbol><symbol id="menu-icon" viewBox="0 0 24 24"><path fill="none" d="M0 0h24v24H0z"/><path d="M3 4h18v2H3V4zm0 7h18v2H3v-2zm0 7h18v2H3v-2z"/></symbol></defs></svg></head><body data-theme="dark"><div class="sidebar-container"><div class="sidebar" id="sidebar"><a href="/" class="sidebar-title sidebar-title-anchor">Home</a><div class="sidebar-items-container"><div class="sidebar-section-title with-arrow" data-isopen="false" id="sidebar-classes"><div>Classes</div><svg><use xlink:href="#down-icon"></use></svg></div><div class="sidebar-section-children-container"><div class="sidebar-section-children"><a href="AgentArray.html">AgentArray</a></div><div class="sidebar-section-children"><a href="AgentList.html">AgentList</a></div><div class="sidebar-section-children"><a href="AgentSet.html">AgentSet</a></div><div class="sidebar-section-children"><a href="Animator.html">Animator</a></div><div class="sidebar-section-children"><a href="DataSet.html">DataSet</a></div><div class="sidebar-section-children"><a href="GUI.html">GUI</a></div><div class="sidebar-section-children"><a href="GeoDataSet.html">GeoDataSet</a></div><div class="sidebar-section-children"><a href="Keyboard.html">Keyboard</a></div><div class="sidebar-section-children"><a href="Link.html">Link</a></div><div class="sidebar-section-children"><a href="Links.html">Links</a></div><div class="sidebar-section-children"><a href="Model.html">Model</a></div><div class="sidebar-section-children"><a href="Model3D.html">Model3D</a></div><div class="sidebar-section-children"><a href="Mouse.html">Mouse</a></div><div class="sidebar-section-children"><a href="Patch.html">Patch</a></div><div class="sidebar-section-children"><a href="Patches.html">Patches</a></div><div class="sidebar-section-children"><a href="RGBDataSet.html">RGBDataSet</a></div><div class="sidebar-section-children"><a href="ThreeDraw.html">ThreeDraw</a></div><div class="sidebar-section-children"><a href="Turtle.html">Turtle</a></div><div class="sidebar-section-children"><a href="Turtle3D.html">Turtle3D</a></div><div class="sidebar-section-children"><a href="Turtles.html">Turtles</a></div><div class="sidebar-section-children"><a href="TwoDraw.html">TwoDraw</a></div><div class="sidebar-section-children"><a href="World.html">World</a></div></div><div class="sidebar-section-title with-arrow" data-isopen="false" id="sidebar-modules"><div>Modules</div><svg><use xlink:href="#down-icon"></use></svg></div><div class="sidebar-section-children-container"><div class="sidebar-section-children"><a href="module-src_geojson.html">src/geojson</a></div><div class="sidebar-section-children"><a href="module-src_gis.html">src/gis</a></div><div class="sidebar-section-children"><a href="module-src_utils.html">src/utils</a></div></div><div class="sidebar-section-title with-arrow" data-isopen="false" id="sidebar-tutorials"><div>Tutorials</div><svg><use xlink:href="#down-icon"></use></svg></div><div class="sidebar-section-children-container"><div class="sidebar-section-children"><a href="tutorial-1 - AgentScript.html">1 - AgentScript</a></div><div class="sidebar-section-children"><a href="tutorial-2 - JavaScript.html">2 - JavaScript</a></div><div class="sidebar-section-children"><a href="tutorial-3 - Browser.html">3 - Browser</a></div><div class="sidebar-section-children"><a href="tutorial-4 - Model.html">4 - Model</a></div><div class="sidebar-section-children"><a href="tutorial-5 - View.html">5 - View</a></div><div class="sidebar-section-children"><a href="tutorial-6.1 - AnimatorController.html">6.1 - AnimatorController</a></div><div class="sidebar-section-children"><a href="tutorial-6.2 - KeyboardController.html">6.2 - KeyboardController</a></div><div class="sidebar-section-children"><a href="tutorial-6.3 - GuiController.html">6.3 - GuiController</a></div><div class="sidebar-section-children"><a href="tutorial-6.4 - MouseController.html">6.4 - MouseController</a></div><div class="sidebar-section-children"><a href="tutorial-7 - CodePenServer.html">7 - CodePenServer</a></div></div></div></div></div><div class="navbar-container" id="VuAckcnZhf"><nav class="navbar"><div class="navbar-left-items"><div class="navbar-item"><a id="github" href="https://github.com/backspaces/agentscript" target="">Github</a></div><div class="navbar-item"><a id="AgentScript" href="https://code.agentscript.org" target="">AgentScript.org</a></div><div class="navbar-item"><a id="npm" href="https://www.npmjs.com/package/agentscript" target="">npm</a></div><div class="navbar-item"><a id="unpkg" href="https://unpkg.com/browse/agentscript/" target="">unpkg</a></div></div><div class="navbar-right-items"><div class="navbar-right-item"><button class="icon-button search-button" aria-label="open-search"><svg><use xlink:href="#search-icon"></use></svg></button></div><div class="navbar-right-item"><button class="icon-button theme-toggle" aria-label="toggle-theme"><svg><use class="theme-svg-use" xlink:href="#light-theme-icon"></use></svg></button></div><div class="navbar-right-item"><button class="icon-button font-size" aria-label="change-font-size"><svg><use xlink:href="#font-size-icon"></use></svg></button></div></div><nav></nav></nav></div><div class="toc-container"><div class="toc-content"><span class="bold">On this page</span><div 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">DataSet.js</h1></header><article><pre class="prettyprint source lang-js"><code>import * as util from './utils.js' /** * A DataSet is an object with width/height and an array * of numbers of length = width * height. * * The array can be a TypedArray or a JavaScript Array. */ class DataSet { width height data // Return an empty dataset of given width, height, dataType /** * Factory method returning an empty dataset of given * width, height, dataType * * @static * @param {number} width The integer width of the array * @param {number} height The integer height of the array * @param {Object} Type Array (default) or one of the typed array types * @returns {DataSet} The resulting DataSet with no values assigned */ static emptyDataSet(width, height, Type = Array) { return new DataSet(width, height, new Type(width * height)) } /** * Creates an instance of DataSet. * Checks data is right size, throws an error if not. * * @param {number} width The integer width of the array * @param {number} height The integer height of the array * @param {Array} data The array of numbers of length width * height */ constructor(width, height, data) { if (data.length !== width * height) { throw Error( `new DataSet length: ${data.length} !== ${width} * ${height}` ) } Object.assign(this, { width, height, data }) } // Checks x,y are within DataSet. Throw error if not. checkXY(x, y) { if (!this.inBounds(x, y)) { throw Error(`DataSet: x,y out of range: ${x}, ${y}`) } } // true if x,y in dataset bounds inBounds(x, y) { return ( util.isBetween(x, 0, this.width - 1) && util.isBetween(y, 0, this.height - 1) ) } dataType() { return this.data.constructor } type() { return this.constructor } // Given x,y in data space, return index into data toIndex(x, y) { return x + y * this.width } // Given index into data, return dataset [x, y] position toXY(i) { return [i % this.width, Math.floor(i / this.width)] } // Get dataset value at x,y, assuming that x,y valididated previously // getXY (x, y) { return this.data[this.toIndex(Math.floor(x), Math.floor(y))] } getXY(x, y) { return this.data[this.toIndex(x, y)] } // Set the data value at x,y to num. assume x,y valid // setXY (x, y, num) { this.data[this.toIndex(Math.floor(x), Math.floor(y))] = num } setXY(x, y, num) { this.data[this.toIndex(x, y)] = num } // Wrapper for sampling, defaults to "nearest". Checks x,y valid as well. // Use this for individual sampling. sample(x, y, useNearest = true) { this.checkXY(x, y) return useNearest ? this.nearest(x, y) : this.bilinear(x, y) } // Nearest neighbor sampling, w/o x,y validity check, i.e. our inner loops nearest(x, y) { return this.getXY(Math.round(x), Math.round(y)) } // Billinear sampling w/o x,y validity check, i.e. our inner loops bilinear(x, y) { // Billinear sampling works by making two linear interpolations (lerps) // in the x direction, and a third in the y direction, between the // two x results. See wikipedia: // [bilinear sampling](http://en.wikipedia.org/wiki/Bilinear_interpolation) // The diagram shows the three lerps // const [x0, y0] = [Math.floor(x), Math.floor(y)] // replaced by next line for speed const x0 = Math.floor(x) const y0 = Math.floor(y) const i = this.toIndex(x0, y0) const w = this.width const dx = x - x0 const dy = y - y0 const dx1 = 1 - dx const dy1 = 1 - dy const f00 = this.data[i] // Edge case: fij is 0 if beyond data array; undefined -> 0. // This cancels the given component's factor in the result. const f10 = this.data[i + 1] || 0 // 0 at bottom right corner const f01 = this.data[i + w] || 0 // 0 at all bottom row const f11 = this.data[i + 1 + w] || 0 // 0 at end of next to bottom row // This is a bit involved but: // ``` // If dx = 0; dx1 = 1, dy != 0 // -> vertical linear interpolation // fxy = f00(1-dy) + f01(dy) i.e. y-lerp // // If dx != 0; dy = 0, dx !=0 // -> horizontal linear interpolation // fxy = f00(1-dx) + f10(dx) i.e. x-lerp // ``` return f00 * dx1 * dy1 + f10 * dx * dy1 + f01 * dx1 * dy + f11 * dx * dy } // Return a copy of this, with new data array clone() { return new DataSet(this.width, this.height, this.data.slice(0)) } // Return new (empty) dataset, defaulting to this type emptyDataSet(width, height, type = this.dataType()) { return DataSet.emptyDataSet(width, height, type) // see static above } // Return new (empty) array of this type emptyArray(length) { const Type = this.type() return new Type(length) } // Create new dataset of size width/height/type by resampling each point. // Type is not this.type() due to integer/float differences. Default Array. // If same size, return a copy of this. // NOTE: This used to calc an x & y scale and apply it: // const xScale = (this.width - 1) / (width - 1) // const yScale = (this.height - 1) / (height - 1) // ... // ds.setXY(x, y, this.sample(x * xScale, y * yScale, useNearest)) // .. which had precision errors. // Multiplying first, then dividing more accurate. resample(width, height, useNearest = true, Type = Array) { if (width === this.width && height === this.height) return this.clone() const ds = DataSet.emptyDataSet(width, height, Type) for (let y = 0; y < height; y++) { for (let x = 0; x < width; x++) { ds.setXY( x, y, this.sample( (x * (this.width - 1)) / (width - 1), (y * (this.height - 1)) / (height - 1), useNearest ) ) } } return ds } // Scale each data element to be between min/max // This is a linear scale from this dataset's min/max // y = mx + b // utils.objects.js: // export function normalize(array, lo = 0, hi = 1) { // const [min, max] = [arrayMin(array), arrayMax(array)] // const scale = 1 / (max - min) // return array.map(n => lerp(lo, hi, scale * (n - min))) // } scale(min, max) { // const data = ds.data const dsMin = this.min() const dsMax = this.max() const dsDelta = dsMax - dsMin const delta = max - min const m = delta / dsDelta const b = min - m * dsMin // const scaledData = data.map((x) => m * x + b) // return new DataSet(ds.width, ds.height, scaledData) return this.map(x => m * x + b) } // Return a rectangular subset of the dataset. // Returned dataset is of same array type as this. subset(x, y, width, height) { if (x + width > this.width || y + height > this.height) { console.log('subset: x+width', x + width, 'this.width', this.width) console.log( 'subset: y+height', y + height, 'this.height', this.height ) throw Error('DataSet.subSet: params out of range') } const ds = this.emptyDataSet(width, height) for (let i = 0; i < width; i++) { for (let j = 0; j < height; j++) { ds.setXY(i, j, this.getXY(i + x, j + y)) } } return ds } // Crop this dataSet by removing top, bottom rows, left, right columns. // You may pass in an obj with top, bottom, left, right key/val pairs crop(top, bottom, left, right) { if (bottom === undefined) { // note var required, let/const have initialization error var { top, bottom, left, right } = top } const width = this.width - left - right const height = this.height - top - bottom // console.log('crop top bottom left right', top, bottom, left, right) // console.log('crop height', this.height, '->', height) // console.log('crop width', this.width, '->', width) // console.log('crop this width/height', this.width, this.height) return this.subset(left, top, width, height) } // Return maped dataset by applying f to each dataset element map(f) { return new DataSet(this.width, this.height, this.data.map(f)) } // Return the column of data at position x as this array's type col(x) { const [w, h, data] = [this.width, this.height, this.data] if (x >= w) throw Error(`col: x out of range width: ${w} x: ${x}`) const colData = this.emptyArray(h) for (let i = 0; i < h; i++) colData[i] = data[x + i * w] return colData } // Return the row of data at position y as this array's type row(y) { const [w, h] = [this.width, this.height] if (y >= h) throw Error(`row: y out of range height: ${h} x: ${y}`) return this.data.slice(y * w, (y + 1) * w) } // Convert this dataset's data to new type. Precision may be lost. // Does nothing if current data is already of this Type. convertType(type) { this.data = util.convertArrayType(this.data, type) } // Concatinate a dataset of equal height to my right to my east. // New DataSet is of same type as this. // // NOTE: concatWest is dataset.concatEast(this) concatEast(ds) { const [w, h] = [this.width, this.height] const [w1, h1] = [ds.width, ds.height] if (h !== h1) throw Error(`concatEast: heights not equal ${h}, ${h1}`) const ds1 = this.emptyDataSet(w + w1, h) // copy this into new dataset for (let x = 0; x < w; x++) { for (let y = 0; y < h; y++) { ds1.setXY(x, y, this.getXY(x, y)) } } // copy ds to the left side for (let x = 0; x < w1; x++) { for (let y = 0; y < h1; y++) { ds1.setXY(x + w, y, ds.getXY(x, y)) } } return ds1 } // Concatinate a dataset of equal width to my south, returning new DataSet. // New DataSet is of same type as this. // // NOTE: concatNorth is dataset.concatSouth(this) concatSouth(dataset) { const [w, h, data] = [this.width, this.height, this.data] if (w !== dataset.width) { throw Error(`concatSouth: widths not equal ${w}, ${dataset.width}`) } const data1 = util.concatArrays(data, dataset.data) return new DataSet(w, h + dataset.height, data1) } // return dataset x,y given x,y in a euclidean space defined by tlx, tly, w, h // x,y is in topleft-bottomright box: [tlx,tly,tlx+w,tly-h], y positive util. // Ex: NetLogo's coords: x, y, minXcor, maxYcor, numX, numY transformCoords(x, y, tlx, tly, w, h) { const xs = ((x - tlx) * (this.width - 1)) / w const ys = ((tly - y) * (this.height - 1)) / h return [xs, ys] } // get a sample using a transformed euclidean coord system; see above coordSample(x, y, tlx, tly, w, h, useNearest = true) { const [xs, ys] = this.transformCoords(x, y, tlx, tly, w, h) return this.sample(xs, ys, useNearest) } // Return Array 3x3 neighbor values of the given x,y of the dataset. // Off-edge neighbors revert to nearest edge value. neighborhood(x, y, array = []) { array.length = 0 // in case user supplied an array to reduce GC const clampNeeded = x === 0 || x === this.width - 1 || y === 0 || y === this.height - 1 for (let dy = -1; dy <= +1; dy++) { for (let dx = -1; dx <= +1; dx++) { let x0 = x + dx let y0 = y + dy if (clampNeeded) { x0 = util.clamp(x0, 0, this.width - 1) y0 = util.clamp(y0, 0, this.height - 1) } array.push(this.data[this.toIndex(x0, y0)]) } } return array } // Return a new dataset of this array type convolved with the // given kernel 3x3 matrix. // See [Convolution](https://en.wikipedia.org/wiki/Kernel_(image_processing)) // // If cropped, do not convolve the edges, returning a smaller dataset. // If not, convolve the edges by extending edge values, returning // dataset of same size. convolve(kernel, factor = 1, crop = false) { const [x0, y0, h, w] = crop // optimization not needed, only called once ? [1, 1, this.height - 1, this.width - 1] : [0, 0, this.height, this.width] const newDS = this.emptyDataSet(w, h) const newData = newDS.data let i = 0 for (let y = y0; y < h; y++) { for (let x = x0; x < w; x++) { const nei = this.neighborhood(x, y) // remind: use reduce if performant let sum2 = 0 for (let i2 = 0; i2 < kernel.length; i2++) { // sum2 += kernel[i2] * nei[i2] // Chrome can't optimize compound let sum2 = sum2 + kernel[i2] * nei[i2] } newData[i++] = sum2 * factor // newDS.data[newDS.toIndex(x, y)] = sum2 * factor } } return newDS } // A few common convolutions. dzdx/y are also called horiz/vert Sobel dzdx(n = 2, factor = 1 / 8) { return this.convolve([-1, 0, 1, -n, 0, n, -1, 0, 1], factor) } dzdy(n = 2, factor = 1 / 8) { return this.convolve([1, n, 1, 0, 0, 0, -1, -n, -1], factor) } laplace8() { return this.convolve([-1, -1, -1, -1, 8, -1, -1, -1, -1]) } laplace4() { return this.convolve([0, -1, 0, -1, 4, -1, 0, -1, 0]) } blur(factor = 0.0625) { // 1/16 = 0.0625 return this.convolve([1, 2, 1, 2, 4, 2, 1, 2, 1], factor) } edge() { return this.convolve([1, 1, 1, 1, -7, 1, 1, 1, 1]) } // Create two new Array convolved datasets, slope and aspect, common in // the use of an elevation data set. See Esri tutorials for // [slope](http://goo.gl/ZcOl08) and [aspect](http://goo.gl/KoI4y5) // // It also returns the two derivitive DataSets, dzdx, dzdy for // those wanting to use the results of the two convolutions. // // Use this.convertType to convert to typed array slopeAndAspect(cellSize = 1, posAngle = true) { const dzdx = this.dzdx() // sub left z from right const dzdy = this.dzdy() // sub bottom z from top let [aspect, slope] = [[], []] const [h, w] = [dzdx.height, dzdx.width] for (let y = 0; y < h; y++) { for (let x = 0; x < w; x++) { const [gx, gy] = [dzdx.getXY(x, y), dzdy.getXY(x, y)] // slope.push(Math.atan(util.distance(gx, gy)) / cellSize) // radians slope.push(Math.atan(util.distance(0, 0, gx, gy)) / cellSize) // if (noNaNs) // while (gx === gy) { // gx += util.randomNormal(0, 0.0001) // gy += util.randomNormal(0, 0.0001) // } // radians in [-PI,PI], downhill // let rad = (gx === gy && gy === 0) ? NaN : Math.atan2(-gy, -gx) let rad = Math.atan2(-gy, -gx) // positive radians in [0,2PI] if desired if (posAngle && rad < 0) rad += 2 * Math.PI aspect.push(rad) } } slope = new DataSet(w, h, slope) aspect = new DataSet(w, h, aspect) return { slope, aspect, dzdx, dzdy } } // Return max/min/extent/sum of data max() { // return util.arrayMax(this.data) return this.data.reduce((a, b) => Math.max(a, b)) } min() { // return util.arrayMin(this.data) return this.data.reduce((a, b) => Math.min(a, b)) } extent() { return [this.min(), this.max()] } sum() { return this.data.reduce((a, b) => a + b) // return this.data.reduce((a, b) => a + b, 0) } // Return new dataset scaled between lo, hi values normalize(lo = 0, hi = 1, round = false) { const [min, max] = this.extent() const scale = 1 / (max - min) let data = this.data.map(n => util.lerp(lo, hi, scale * (n - min))) if (round) data = data.map(n => Math.round(n)) return new DataSet(this.width, this.height, data) } // Test that this has same width, height, data as dataset. // Note: does not require equal array type (Array or TypedArray) equals(dataset) { return ( this.width === dataset.width && this.height === dataset.height && util.arraysEqual(this.data, dataset.data) ) } } export default DataSet // REMIND: limit to data that can be 24 bit. Error otherwise. // DataType of Int8, 16, Int24 OK, others need testing. // Possibly use precision to minimize byte size to 3, rgb? // // Convert dataset to an image context object. // // This can be used to "visualize" the data by normalizing // which will scale the data to use the entire RGB space. // It can also be used to create tiles or image-as-data if // the defaults are used. // // Due to // [alpha-premultiply](https://en.wikipedia.org/wiki/Alpha_compositing), // the best we can do as data is 24 bit ints. // You can simulate floats/fixed by multiplying the dataset // the dividing on conversion back. // // Our preferred transport is in the works, likely in the // tile datasets via blobs or arraybuffers. Sigh. // toContext (normalize = false, gray = false, alpha = 255) { // const [w, h, data] = [this.width, this.height, this.data] // let idata // if (normalize) { // idata = gray // ? util.normalize8(data) : util.normalizeInt(data, 0, Math.pow(2, 24) - 1) // } else { // idata = data.map((a) => Math.round(a)) // } // const ctx = util.createCtx(w, h) // const id = ctx.getImageData(0, 0, w, h) // const ta = id.data // ta short for typed array // for (let i = 0; i < idata.length; i++) { // const [num, j] = [idata[i], 4 * i] // j = byte index into ta // if (gray) { // ta[j] = ta[j + 1] = ta[j + 2] = Math.floor(num); ta[j + 3] = alpha // } else { // ta[j] = (num >> 16) & 0xff // ta[j + 1] = (num >> 8) & 0xff // ta[j + 2] = num & 0xff // ta[j + 3] = alpha // if not 255, image will be premultiplied. // } // } // ctx.putImageData(id, 0, 0) // return ctx // } // // // Convert dataset to a canvas, which can be used as an image // toCanvas (normalize = false, gray = false, alpha = 255) { // return this.toContext(gray, normalize, alpha).canvas // } // // Convert dataset to a base64 string // toDataUrl (normalize = false, gray = false, alpha = 255) { // return util.ctxToDataUrl(this.toContext(gray, normalize, alpha)) // } // // Get/Set name, useful for storage key. // setName(string) { // this.name = string // return this // } // getName() { // return this.name ? this.name : this.makeName() // } // makeName() { // const { width, height } = this // const sum = this.sum().toFixed(2) // return `${this.dataType().name}-${width}-${height}-${sum}` // } </code></pre></article></section><footer class="footer" id="PeOAagUepe"><div class="wrapper">AgentScript version: 0.10.20 using clean-jsdoc-theme</div></footer></div></div></div><div class="search-container" id="PkfLWpAbet" style="display:none"><div class="wrapper" id="iCxFxjkHbP"><button class="icon-button search-close-button" id="VjLlGakifb" aria-label="close search"><svg><use xlink:href="#close-icon"></use></svg></button><div class="search-box-c"><svg><use xlink:href="#search-icon"></use></svg> <input type="text" id="vpcKVYIppa" class="search-input" placeholder="Search..." autofocus></div><div class="search-result-c" id="fWwVHRuDuN"><span class="search-result-c-text">Type anything to view search result</span></div></div></div><div class="mobile-menu-icon-container"><button class="icon-button" id="mobile-menu" data-isopen="false" aria-label="menu"><svg><use xlink:href="#menu-icon"></use></svg></button></div><div id="mobile-sidebar" class="mobile-sidebar-container"><div class="mobile-sidebar-wrapper"><a href="/" class="sidebar-title sidebar-title-anchor">Home</a><div class="mobile-nav-links"><div class="navbar-item"><a id="github-mobile" href="https://github.com/backspaces/agentscript" target="">Github</a></div><div class="navbar-item"><a id="AgentScript-mobile" href="https://code.agentscript.org" target="">AgentScript.org</a></div><div class="navbar-item"><a id="npm-mobile" href="https://www.npmjs.com/package/agentscript" target="">npm</a></div><div class="navbar-item"><a id="unpkg-mobile" href="https://unpkg.com/browse/agentscript/" target="">unpkg</a></div></div><div class="mobile-sidebar-items-c"><div class="sidebar-section-title with-arrow" data-isopen="false" id="sidebar-classes"><div>Classes</div><svg><use xlink:href="#down-icon"></use></svg></div><div class="sidebar-section-children-container"><div class="sidebar-section-children"><a href="AgentArray.html">AgentArray</a></div><div class="sidebar-section-children"><a href="AgentList.html">AgentList</a></div><div class="sidebar-section-children"><a href="AgentSet.html">AgentSet</a></div><div class="sidebar-section-children"><a href="Animator.html">Animator</a></div><div class="sidebar-section-children"><a href="DataSet.html">DataSet</a></div><div class="sidebar-section-children"><a href="GUI.html">GUI</a></div><div class="sidebar-section-children"><a href="GeoDataSet.html">GeoDataSet</a></div><div class="sidebar-section-children"><a href="Keyboard.html">Keyboard</a></div><div class="sidebar-section-children"><a href="Link.html">Link</a></div><div class="sidebar-section-children"><a href="Links.html">Links</a></div><div class="sidebar-section-children"><a href="Model.html">Model</a></div><div class="sidebar-section-children"><a href="Model3D.html">Model3D</a></div><div class="sidebar-section-children"><a href="Mouse.html">Mouse</a></div><div class="sidebar-section-children"><a href="Patch.html">Patch</a></div><div class="sidebar-section-children"><a href="Patches.html">Patches</a></div><div class="sidebar-section-children"><a href="RGBDataSet.html">RGBDataSet</a></div><div class="sidebar-section-children"><a href="ThreeDraw.html">ThreeDraw</a></div><div class="sidebar-section-children"><a href="Turtle.html">Turtle</a></div><div class="sidebar-section-children"><a href="Turtle3D.html">Turtle3D</a></div><div class="sidebar-section-children"><a href="Turtles.html">Turtles</a></div><div class="sidebar-section-children"><a href="TwoDraw.html">TwoDraw</a></div><div class="sidebar-section-children"><a href="World.html">World</a></div></div><div class="sidebar-section-title with-arrow" data-isopen="false" id="sidebar-modules"><div>Modules</div><svg><use xlink:href="#down-icon"></use></svg></div><div class="sidebar-section-children-container"><div class="sidebar-section-children"><a href="module-src_geojson.html">src/geojson</a></div><div class="sidebar-section-children"><a href="module-src_gis.html">src/gis</a></div><div class="sidebar-section-children"><a href="module-src_utils.html">src/utils</a></div></div><div class="sidebar-section-title with-arrow" data-isopen="false" id="sidebar-tutorials"><div>Tutorials</div><svg><use xlink:href="#down-icon"></use></svg></div><div class="sidebar-section-children-container"><div class="sidebar-section-children"><a href="tutorial-1 - AgentScript.html">1 - AgentScript</a></div><div class="sidebar-section-children"><a href="tutorial-2 - JavaScript.html">2 - JavaScript</a></div><div class="sidebar-section-children"><a href="tutorial-3 - Browser.html">3 - Browser</a></div><div class="sidebar-section-children"><a href="tutorial-4 - Model.html">4 - Model</a></div><div class="sidebar-section-children"><a href="tutorial-5 - View.html">5 - View</a></div><div class="sidebar-section-children"><a href="tutorial-6.1 - AnimatorController.html">6.1 - AnimatorController</a></div><div class="sidebar-section-children"><a href="tutorial-6.2 - KeyboardController.html">6.2 - KeyboardController</a></div><div class="sidebar-section-children"><a href="tutorial-6.3 - GuiController.html">6.3 - GuiController</a></div><div class="sidebar-section-children"><a href="tutorial-6.4 - MouseController.html">6.4 - MouseController</a></div><div class="sidebar-section-children"><a href="tutorial-7 - CodePenServer.html">7 - CodePenServer</a></div></div></div><div class="mobile-navbar-actions"><div class="navbar-right-item"><button class="icon-button search-button" aria-label="open-search"><svg><use xlink:href="#search-icon"></use></svg></button></div><div class="navbar-right-item"><button class="icon-button theme-toggle" aria-label="toggle-theme"><svg><use class="theme-svg-use" xlink:href="#light-theme-icon"></use></svg></button></div><div class="navbar-right-item"><button class="icon-button font-size" aria-label="change-font-size"><svg><use xlink:href="#font-size-icon"></use></svg></button></div></div></div></div><script type="text/javascript" src="scripts/core.min.js"></script><script src="scripts/search.min.js" defer="defer"></script><script src="scripts/third-party/fuse.js" defer="defer"></script><script type="text/javascript">var tocbotInstance=tocbot.init({tocSelector:"#eed4d2a0bfd64539bb9df78095dec881",contentSelector:".main-content",headingSelector:"h1, h2, h3",hasInnerContainers:!0,scrollContainer:".main-content",headingsOffset:130,onClick:bringLinkToView})</script></body></html>