agentscript
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AgentScript Model in Model/View architecture
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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">World.js</h1></header><article><pre class="prettyprint source lang-js"><code>import * as util from './utils.js'
// class World defines the coordinate system for the model.
// It will be upgraded with methods converting from other
// transforms like GIS and DataSets.
// const defaultZ = (maxX, maxY) => Math.max(maxX, maxY)
/**
* @private
* @typedef {Object} WorldOptions
* @property {number} minX Min world patch x integer value
* @property {number} minY Min world patch y integer value
* @property {number} minZ Min world patch z integer value
* @property {number} maxX Max world patch x integer value
* @property {number} maxY Max world patch y integer value
* @property {number} maxZ Max world patch z integer value
*/
/**
* Class World defines the coordinate system for the model.
* It has transforms for multiple coordinate systems.
*
* The world is defined by an object with 6 properties:
*
* WorldOptions = {
* minX: integer,
* maxX: integer,
* minY: integer,
* maxY: integer,
* minZ: integer,
* maxZ: integer,
* }
*/
class World {
maxX = 16
minX = -16
maxY = 16
minY = -16
// maxZ = 0
// minZ = 0
maxZ = 16
minZ = -16
/**
* Return a default options object, origin at center.
*
* @param {number} [maxX=16] Integer max X value
* @param {number} [maxY=maxX] Integer max Y value
* @param {number} [maxZ=Math.max(maxX, maxY)] Integer max Z value
* @returns WorldOptions
*/
static defaultOptions(maxX = 16, maxY = maxX, maxZ = Math.max(maxX, maxY)) {
return {
minX: -maxX,
maxX: maxX,
minY: -maxY,
maxY: maxY,
minZ: -maxZ,
maxZ: maxZ,
}
}
/**
* Factory to create a default World instance.
*
* @param {number} [maxX=16] Integer max X value
* @param {number} [maxY=maxX] Integer max Y value
* @param {number} [maxZ=Math.max(maxX, maxY)] Integer max Z value
* @returns {World}
*/
static defaultWorld(maxX = 16, maxY = maxX, maxZ = maxX) {
return new World(World.defaultOptions(maxX, maxY, maxZ))
}
// ======================
/**
* Create a new World object given an Object with optional
* minX, maxX, minY, maxY, minZ, maxZ overriding class properties.
* @param {World|WorldOptions|Object} options Object with overrides for class properties
*/
constructor(options = {}) {
Object.assign(this, options) // set the option override values
this.setWorld() // convert these to rest of world parameters
}
// ======================
setWorld() {
// Complete properties derived from minX/Y, maxX/Y (patchSize === 1)
let { minX, maxX, minY, maxY, minZ, maxZ } = this
util.forLoop({ minX, maxX, minY, maxY, minZ, maxZ }, (val, key) => {
if (!Number.isInteger(val))
throw Error(`World: ${key}:${val} must be an integer`)
})
this.numX = this.width = maxX - minX + 1
this.numY = this.height = maxY - minY + 1
// if (maxZ == null) maxZ = this.maxZ = Math.max(this.width, this.height)
this.numZ = this.depth = maxZ - minZ + 1
this.minXcor = minX - 0.5
this.maxXcor = maxX + 0.5
this.minYcor = minY - 0.5
this.maxYcor = maxY + 0.5
this.minZcor = minZ - 0.5
this.maxZcor = maxZ + 0.5
// The midpoints of the world, in world coords.
this.centerX = (minX + maxX) / 2
this.centerY = (minY + maxY) / 2
this.centerZ = (minZ + maxZ) / 2
this.numPatches = this.numX * this.numY
}
/**
* Return the options (minX, maxX, ..) used to create this world.
*
* @returns {Object} A WorldOptions object
*/
getOptions() {
const { minX, minY, minZ, maxX, maxY, maxZ } = this
return { minX, minY, minZ, maxX, maxY, maxZ }
}
/**
* Return a random 2D float point within the World
*
* @returns {Array} A random x,y float array
*/
randomPoint() {
return [
util.randomFloat2(this.minXcor, this.maxXcor),
util.randomFloat2(this.minYcor, this.maxYcor),
]
}
/**
* Return a random 3D point within the World
*
* @returns {Array} A random x,y,z float array
*/
random3DPoint() {
return [
util.randomFloat2(this.minXcor, this.maxXcor),
util.randomFloat2(this.minYcor, this.maxYcor),
util.randomFloat2(this.minZcor, this.maxZcor),
]
}
/**
* Return a random Patch 2D integer point
*
* @returns {Array} A random x,y integer array
*/
randomPatchPoint() {
return [
util.randomInt2(this.minX, this.maxX),
util.randomInt2(this.minY, this.maxY),
]
}
/**
* Given x,y,z values return true if within the world
*
* @param {number} x x value
* @param {number} y y value
* @param {number} [z=this.centerZ] z value
* @returns {boolean} Whether or not on-world
*/
isOnWorld(x, y, z = this.centerZ) {
return (
this.minXcor <= x &&
x <= this.maxXcor &&
//
this.minYcor <= y &&
y <= this.maxYcor &&
//
this.minZcor <= z &&
z <= this.maxZcor
)
}
// cropToWorld(x, y) {}
/**
* Return an instance of a bounding box 2D transform.
* It linearly interpolates between the given minX, minY, maxX, maxY,
* and the world's values of the same properties.
*
* The parameters are in the popular geojson order: west, south, east, north
*
* Useful for Canvas (pixel) top-left transforms and geojson transforms.
*
* Note minX etc NOT the world's but of the coord sys we want to use.
*
* @param {number} minX min bounding box x value
* @param {number} minY min bounding box y value
* @param {number} maxX max bounding box x value
* @param {number} maxY max bounding box y value
* @returns {BBoxTransform} Instance of the BBoxTransform
*/
bboxTransform(minX, minY, maxX, maxY) {
return new BBoxTransform(minX, minY, maxX, maxY, this)
}
// ### Following functions use PatchSize
// Get the world size in pixels. PatchSize is optional, defaulting to 1
// getWorldSize(patchSize = 1) {
// return [this.numX * patchSize, this.numY * patchSize]
// }
getWorldSize() {
return [this.numX, this.numY]
}
// Convert a canvas context to world euclidean coordinates
// Change the ctx.canvas size, determined by patchSize.
setEuclideanTransform(ctx, patchSize) {
// ctx.canvas.width = this.numX * patchSize
// ctx.canvas.height = this.numY * patchSize
this.setCanvasSize(ctx.canvas, patchSize)
ctx.restore() // close earlier save(). OK if no save called yet.
ctx.save()
ctx.scale(patchSize, -patchSize)
ctx.translate(-this.minXcor, -this.maxYcor)
}
// Return patch size for given canvas.
// Error if canvas patch width/height differ.
patchSize(canvas) {
const { numX, numY } = this
// const { clientWidth: width, clientHeight: height } = canvas
// const xSize = width / numX
// const ySize = height / numY
const { clientWidth, clientHeight } = canvas
const xSize = clientWidth / numX
const ySize = clientHeight / numY
if (xSize !== ySize) {
throw Error(`World patchSize: x/y sizes differ ${xSize}, ${ySize}`)
}
return xSize
}
// Change canvas size to this world's size.
// Does not change size if already the same, preserving the ctx content.
setCanvasSize(canvas, patchSize) {
// const [width, height] = this.getWorldSize(patchSize)
// const [width, height] = this.getWorldSize()
util.setCanvasSize(canvas, this.numX * patchSize, this.numY * patchSize)
}
// Convert pixel location (top/left offset i.e. mouse) to patch coords (float)
pixelXYtoPatchXY(x, y, patchSize) {
return [this.minXcor + x / patchSize, this.maxYcor - y / patchSize]
}
// Convert patch coords (float) to pixel location (top/left offset i.e. mouse)
patchXYtoPixelXY(x, y, patchSize) {
return [(x - this.minXcor) * patchSize, (this.maxYcor - y) * patchSize]
}
xyToPatchIndex(x, y) {
if (!this.isOnWorld(x, y)) return undefined
const { minX, maxX, maxY, numX, maxXcor, maxYcor } = this
x = x === maxXcor ? maxX : Math.round(x)
y = y === maxYcor ? maxY : Math.round(y)
return x - minX + numX * (maxY - y)
}
// patchIndexToXY(index) {}
}
export default World
/**
* A linear transformer between world coords and the given bounding box.
* @private
*/
class BBoxTransform {
/**
* Creates an instance of BBoxTransform.
*
* - See [ietf reference](https://tools.ietf.org/html/rfc7946#section-5)
* - .. which defines bbox as [west, south, east, north]
* - .. which is the bbox [minX, minY, maxX, maxY]
*
* @param {number} minX min bounding box x value
* @param {number} minY max bounding box x value
* @param {number} maxX min bounding box y value
* @param {number} maxY max bounding box y value
* @param {World} world instance of a World object
*/
constructor(minX, minY, maxX, maxY, world) {
this.bbox = [minX, minY, maxX, maxY]
if (minX < maxX) console.log('flipX')
if (maxY < minY) console.log('flipY')
if (minX < maxX) [minX, maxX] = [maxX, minX]
if (maxY < minY) [maxY, minY] = [minY, maxY]
const { maxXcor, maxYcor, minXcor, minYcor } = world
const mx = (minX - maxX) / (maxXcor - minXcor)
const my = (maxY - minY) / (maxYcor - minYcor)
const bx = (minX + maxX - mx * (maxXcor + minXcor)) / 2
const by = (maxY + minY - my * (maxYcor + minYcor)) / 2
Object.assign(this, { mx, my, bx, by })
}
/**
* Convert from bbox point to world point
*
* @param {Array} bboxPoint A point in the bbox coordinates
* @returns {Array} A point in the world coordinates
*/
toWorld(bboxPoint) {
const { mx, my, bx, by } = this
const [bboxX, bboxY] = bboxPoint
const x = (bboxX - bx) / mx
const y = (bboxY - by) / my
return [x, y]
}
/**
* Convert from world point to bbox point
*
* @param {Array} worldPoint A point in the world coordinates
* @returns {Array} A point in the bbox coordinates
*/
toBBox(worldPoint) {
const { mx, my, bx, by } = this
const [worldX, worldY] = worldPoint
const x = mx * worldX + bx
const y = my * worldY + by
return [x, y]
}
// aspectRatio() {
// const [west, south, east, north] = this.bbox
// return Math.abs((east - west) / (north - south))
// }
// Return bbox in xfm coords
// bbox() {
// const [west, south, east, north] = this.bbox
// return [west, south, east, north]
// // return this.bbox // name conflict?
// }
// // Return center [x,y] of bbox in bbox coords.
// bboxCenter() {
// const [west, south, east, north] = this.bbox
// return [(west + east) / 2, (south + north) / 2]
// }
// // Return 4 coordinate points of bbox corners, from topLeft, clockwise.
// bboxCoords() {
// const [west, south, east, north] = this.bbox
// return [
// [west, north],
// [east, north],
// [east, south],
// [west, south],
// ]
// }
// // Return a geojson feature for this bbox
// bboxFeature(properties = {}) {
// const coords = this.bboxCoords(bbox)
// coords.push(coords[0]) // polys are closed, repeat first coord
// return {
// type: 'feature',
// geometry: {
// cordinates: coords,
// type: 'Polygon',
// },
// properties,
// }
// }
}
</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 - 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