RandomLayerOrder.js

/**
 * Script © 2022 Boris Boguslavsky
 * https://github.com/borisboguslavsky
 *
 * Based on the Random Layer Order Functionality from the Randomill Illustrator Plugin
 * https://randomill.com/
 *
 * Feel free to modify this script as you see fit. I hope you find it useful.
 */

// dialog window
var dialog = new Window("dialog", "Random Layer Order - randomill.com", undefined)
dialog.orientation = "column"
dialog.alignChildren = ["left", "top"]
dialog.spacing = 10
dialog.margins = 16

// radios for selection method
var optionsPanel = dialog.add("panel", undefined, "Options:")
optionsPanel.text = "Options"
optionsPanel.orientation = "column"
optionsPanel.alignChildren = ["left", "top"]
optionsPanel.margins = 16
optionsPanel.alignment = ["fill", "top"]
var respectParentLayers = optionsPanel.add("checkbox", undefined, "Respect Parent Layers")
respectParentLayers.value = true

// footer buttons
var footerButtons = dialog.add("group")
footerButtons.alignment = ["fill", "top"]
footerButtons.alignChildren = ["fill", "fill"]
footerButtons.margins = [0, 0, 0, 0]
var upgradeBannerString =
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var upgadeButton = footerButtons.add("iconbutton", undefined, upgradeBannerString)
upgadeButton.helpTip = "Visit Randomill.com"
upgadeButton.onClick = function () {
	try {
		var URL = new File(Folder.temp + "/Randomill.html")
		URL.open("w")
		URL.writeln("<html><head>")
		URL.writeln('<meta HTTP-EQUIV="REFRESH" content="0; url=https://randomill.com/">')
		URL.writeln("</head></html>")
		URL.close()
		URL.execute()
	} catch (e) {
		alert("Error opening the Randomill site. Visit randomill.com directly.")
	}
}
var close = footerButtons.add("button", undefined, "Close")
close.helpTip = "Press Esc to Close"
close.onClick = function () {
	dialog.close()
}
var apply = footerButtons.add("button", undefined, "Apply")
apply.helpTip = "Press Enter to Run"
apply.onClick = function () {
	try {
		// ensure a document is open
		if (app.documents.length === 0 || !app.activeDocument) {
			throw new Error("No currently active document.")
		}
		// ensure some objects are selected
		var objects = app.activeDocument.selection
		if (!app.activeDocument.selection || app.activeDocument.selection.length === 0) {
			throw new Error("No currently selected objects. Select objects first.")
		}

		if (respectParentLayers.value) {
			shuffleLayersRespectParents(objects)
		} else {
			shuffleLayers(objects)
		}

		app.redraw()
	} catch (err) {
		alert("Error: \n" + err.message)
	}
}
apply.active = true

function shuffleLayers(objects) {
	var shuffled = shuffleArray(objects)
	var loopLength =
		objects.length % 2 === 0 ? objects.length / 2 : Math.floor(objects.length / 2) + 1
	for (var i = 0; i < loopLength; i++) {
		var a = shuffled[i * 2]
		var b = shuffled[i * 2 + 1]
		if (!b) {
			b = shuffled[0]
		}
		swapTwoLayers(a, b)
	}
}

function shuffleLayersRespectParents(objects) {
	// there must be at least two objects
	if (objects.length < 2) return
	// create a dictionary of arrays of all the objects where each array represents a parent layer
	var separatedObjects = collectObjectsByParentLayers(objects)
	// get the keys for that dictionary (will be the absoluteZOrderPosition) of each parent layer
	var separatedParentLayers = getKeys(separatedObjects)
	// for every parent layer in the dictionary
	for (var i = 0; i < separatedParentLayers.length; i++) {
		// arrange all the objects in order for that parent layer
		shuffleLayers(separatedObjects[separatedParentLayers[i]])
	}
}

function swapTwoLayers(a, b) {
	var temp = b.duplicate(b)
	b.move(a, ElementPlacement.PLACEBEFORE)
	a.move(temp, ElementPlacement.PLACEAFTER)
	temp.remove()
}

function collectObjectsByParentLayers(objects) {
	var objects = app.activeDocument.selection
	var topArr = new Object()
	// For each object
	for (var i = 0; i < objects.length; i++) {
		// Make sure that the topArr has an entry for the parent layer of the object
		if (!topArr[objects[i].layer.absoluteZOrderPosition])
			topArr[objects[i].layer.absoluteZOrderPosition] = new Array()
		// Push that object to the parent layer array
		topArr[objects[i].layer.absoluteZOrderPosition].push(objects[i])
	}
	return topArr
}

function getKeys(obj) {
	if (Object(obj) !== obj) {
		throw new TypeError("Object.keys can only be called on Objects.")
	}
	var hasOwnProperty = Object.prototype.hasOwnProperty
	var result = []
	for (var prop in obj) {
		if (hasOwnProperty.call(obj, prop)) {
			result.push(prop)
		}
	}
	return result
}

function shuffleArray(array) {
	var curId = array.length
	// There remain elements to shuffle
	while (0 !== curId) {
		// Pick a remaining element
		var randId = Math.floor(Math.random() * curId)
		curId -= 1
		// Swap it with the current element.
		var tmp = array[curId]
		array[curId] = array[randId]
		array[randId] = tmp
	}
	return array
}

dialog.center()
dialog.show()