RandomSelection.js

/**
 * Script © 2022 Boris Boguslavsky
 * https://github.com/borisboguslavsky
 *
 * Based on the Random Selection 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 Selection - randomill.com", undefined)
dialog.orientation = "column"
dialog.alignChildren = ["left", "top"]
dialog.spacing = 10
dialog.margins = 16

// options group
var options = dialog.add("group")
options.orientation = "row"
options.alignChildren = ["fill", "fill"]
options.alignment = ["fill", "top"]

// selection method panel
var selectionMethodSelect = options.add("panel", undefined, "Selection Method:")
selectionMethodSelect.orientation = "column"
selectionMethodSelect.alignChildren = ["left", "top"]
selectionMethodSelect.margins = 16
selectionMethodSelect.alignment = ["fill", "top"]
var selMethodPercentageRadio = selectionMethodSelect.add("radiobutton", undefined, "Percentage")
var selMethodCountRadio = selectionMethodSelect.add("radiobutton", undefined, "Count")
selMethodPercentageRadio.value = true

// value field panel
var valueInputTextField = options.add("panel", undefined, "Value:")
valueInputTextField.orientation = "column"
valueInputTextField.alignChildren = ["left", "top"]
valueInputTextField.margins = 10
valueInputTextField.alignment = ["fill", "fill"]
var selectionValue = valueInputTextField.add("edittext", undefined, 50)
selectionValue.characters = 5

// 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 {
		PageSwapEvent
		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.onClick = function () {
	dialog.close()
}
var apply = footerButtons.add("button", undefined, "Apply")
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.")
		}

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

function randomizeSelection(objects) {
	// ensure there's at least two objects in the selection
	if (objects.length < 2) {
		throw new Error("Select at least two objects to randomize selection.")
	}

	// establish the selection method
	var selectionMethod = selMethodPercentageRadio.value ? "percentage" : "count"

	// make sure the entered value is valid
	var value = parseFloat(selectionValue.text)
	if (isNaN(value)) {
		throw new Error("Could not parse entered value.")
	}

	// determine the number of objects that should end up selected
	var numberOfObjectsInFinalSelection = calculateNumberOfObjectsToSelect(
		objects.length,
		selectionMethod,
		value
	)

	// if the number of objects calculated ends up being zero, deslect everything
	if (numberOfObjectsInFinalSelection <= 0) {
		app.activeDocument.selection = []
		return
	}

	// if the number of objects to select is somehow greater than the selection length, just return
	if (numberOfObjectsInFinalSelection >= objects.length) {
		return
	}

	// determine whether the most efficient way is to select objects starting from an empty array,
	// or to deslect objects from the currently selected object array
	var whatToDo = selectOrDeselect(objects.length, numberOfObjectsInFinalSelection)
	var deselect = whatToDo.deselect

	// how many objects must be either selected or deselected?
	var howManyTimes = whatToDo.number

	// create a randomized array of indices with the length of the current selection
	var selectionIndexList = randomizedIndexListFischerYates(objects.length)

	// if selecting instead of deselecting, start with an empty array
	if (!deselect) app.activeDocument.selection = []

	// set selection by modifying each object's 'selected' attribute
	for (i = 0; i < howManyTimes; i++) {
		var j = selectionIndexList[i]
		if (objects[j] !== undefined) {
			objects[j].selected = !deselect
		}
	}

	return
}

function calculateNumberOfObjectsToSelect(selectionLength, selectionMethod, value) {
	var numberOfObjectsToSelect =
		selectionMethod === "percentage" ? Math.round((selectionLength * value) / 100) : value

	$.writeln("	Number of objects to select: " + numberOfObjectsToSelect)

	if (numberOfObjectsToSelect <= 0) return 0
	if (numberOfObjectsToSelect >= selectionLength) return selectionLength

	return numberOfObjectsToSelect
}

function selectOrDeselect(selectionLength, numObjToSelect) {
	var deselect = false
	var modeTippingPoint = 0.6
	var remainingSelectionPercentage = numObjToSelect / selectionLength
	if (remainingSelectionPercentage <= modeTippingPoint) {
		// select
		var numberOfItemsToOperateOn = numObjToSelect
	} else {
		// deselect
		var numberOfItemsToOperateOn = selectionLength - numObjToSelect
		deselect = true
	}

	return { deselect: deselect, number: numberOfItemsToOperateOn }
}

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
}

function randomizedIndexListFischerYates(length) {
	// create an unshuffled array
	var randomizedArray = new Array()
	for (var i = 0; i < length; i++) {
		randomizedArray.push(i)
	}
	// shuffle the array using fischer-yates
	return shuffleArray(randomizedArray)
}

dialog.center()
dialog.show()