Photoshop Script to generate a random letter pattern. Includes a generous option dialog.

RandomLetters.jsx

/**
* Created by Aram Becker - 09/25/2019
* You are free to use and modify this by any means, but it would be great
* if you would credit me.
*
* http://arambecker.de
**/

function coupleSlider(slider, box, round) {
	round = typeof round == "number" ? Math.pow(10, round) : 100;
	regex = round == 1 ? /\d+/ : /\d+\.?\d*/;
	box.onChange = function() {
		if (!regex.test(box.text)) box.text = Math.round(slider.value * round) / round;
		slider.value = parseFloat(box.text);
	};
	slider.onChange = function() { box.text = Math.round(slider.value * round) / round; };
}

function coupleEnable(radioButton, target) {
	if (!(target instanceof Array)) target = [target];
	function update() { for (var i = 0; i < target.length; i++) target[i].enabled = radioButton.value; }
	radioButton.onClick = update;
	for (var i = 0; i < radioButton.parent.children.length; i++)
		radioButton.parent.children[i].onClick = update;
}

// DIALOG
// ======
var dialog = new Window("dialog"); 
    dialog.text = "Generate Random Letters"; 
    dialog.orientation = "column"; 
    dialog.alignChildren = ["center","top"]; 
    dialog.spacing = 10; 
    dialog.margins = 16; 

// LETTER_SETTINGS
// ===============
var letter_settings = dialog.add("panel", undefined, undefined, {name: "letter_settings"}); 
    letter_settings.text = "Letter Settings"; 
    letter_settings.preferredSize.width = 512; 
    letter_settings.orientation = "column"; 
    letter_settings.alignChildren = ["left","top"]; 
    letter_settings.spacing = 10; 
    letter_settings.margins = 10; 
	
// GROUP0
// ======
var group0 = letter_settings.add("group", undefined, {name: "group0"}); 
    group0.orientation = "row"; 
    group0.alignChildren = ["left","center"]; 
    group0.spacing = 10; 
    group0.margins = 0; 

var statictext0 = group0.add("statictext", undefined, undefined, {name: "statictext0"}); 
    statictext0.text = "Font:"; 
    statictext0.preferredSize.width = 64;

var font_array = [];
for (var i = 0; i < app.fonts.length; i++) font_array.push(app.fonts[i].name);
font_array.sort();
var font = group0.add("dropdownlist", undefined, undefined, {name: "font", items: font_array}); 
    font.preferredSize.width = 212;
    font.selection = 0;
	
var font_bold = group0.add("checkbox", undefined, undefined, {name: "font_bold"}); 
    font_bold.text = "Bold";
	
var font_italic = group0.add("checkbox", undefined, undefined, {name: "font_italic"}); 
    font_italic.text = "Italic";
	
var preview = group0.add("statictext", undefined, undefined, {name: "preview"}); 
    preview.text = "ABCD abcd 1234 #?!.";
    preview.preferredSize.width = 196;
	preview.graphics.font = font_array[0];
	
font.onChange = font_bold.onClick = font_italic.onClick = function() {
	preview.graphics.font =  ScriptUI.newFont(font_array[parseInt(font.selection)], font_bold.value ? (font_italic.value ? 3 : 1) : (font_italic.value ? 2 : 0), 12);
}
	
var select

// GROUP1
// ======
var group1 = letter_settings.add("group", undefined, {name: "group1"}); 
    group1.orientation = "row"; 
    group1.alignChildren = ["left","center"]; 
    group1.spacing = 10; 
    group1.margins = 0; 

var statictext1 = group1.add("statictext", undefined, undefined, {name: "statictext1"}); 
    statictext1.text = "Number:"; 
    statictext1.preferredSize.width = 64; 

var letter_count_slider = group1.add("slider", undefined, undefined, undefined, undefined, {name: "letter_count_slider"}); 
    letter_count_slider.minvalue = 0; 
    letter_count_slider.maxvalue = 200; 
    letter_count_slider.value = 10; 
	letter_count_slider.preferredSize.width = 256; 

var letter_count_box = group1.add('edittext {justify: "right", properties: {name: "letter_count_box", enterKeySignalsOnChange: true}}'); 
    letter_count_box.text = "10"; 
    letter_count_box.preferredSize.width = 64;
	
var letter_count_reset = group1.add("button", undefined, undefined, {name: "letter_size_reset"}); 
    letter_count_reset.text = "Reset"; 
    letter_count_reset.alignment = ["left","top"];
	
	coupleSlider(letter_count_slider, letter_count_box, 0);
	
	letter_count_reset.onClick = function() {
		letter_count_slider.value = 10;
		letter_count_box.text = "10";
	}

// LETTER_SETTINGS
// ===============
var divider1 = letter_settings.add("panel", undefined, undefined, {name: "divider1"}); 
    divider1.alignment = "fill"; 

// GROUP2
// ======
var group2 = letter_settings.add("group", undefined, {name: "group2"}); 
    group2.orientation = "row"; 
    group2.alignChildren = ["left","center"]; 
    group2.spacing = 10; 
    group2.margins = 0; 

var statictext2 = group2.add("statictext", undefined, undefined, {name: "statictext2"}); 
    statictext2.text = "Min Size:"; 
    statictext2.preferredSize.width = 64; 

var letter_min_size_slider = group2.add("slider", undefined, undefined, undefined, undefined, {name: "letter_min_size_slider"}); 
    letter_min_size_slider.minvalue = 0; 
    letter_min_size_slider.maxvalue = 100; 
    letter_min_size_slider.value = 16; 
	letter_min_size_slider.preferredSize.width = 256; 

var letter_min_size_box = group2.add('edittext {justify: "right", properties: {name: "letter_min_size_box", enterKeySignalsOnChange: true}}'); 
    letter_min_size_box.text = "16"; 
    letter_min_size_box.preferredSize.width = 64;
	
	coupleSlider(letter_min_size_slider, letter_min_size_box, 1);

// GROUP3
// ======
var group3 = letter_settings.add("group", undefined, {name: "group3"}); 
    group3.orientation = "row"; 
    group3.alignChildren = ["left","center"]; 
    group3.spacing = 10; 
    group3.margins = 0; 

var statictext3 = group3.add("statictext", undefined, undefined, {name: "statictext3"}); 
    statictext3.text = "Max Size:"; 
    statictext3.preferredSize.width = 64; 

var letter_max_size_slider = group3.add("slider", undefined, undefined, undefined, undefined, {name: "letter_max_size_slider"}); 
    letter_max_size_slider.minvalue = 0; 
    letter_max_size_slider.maxvalue = 100; 
    letter_max_size_slider.value = 20;
	letter_max_size_slider.preferredSize.width = 256; 

var letter_max_size_box = group3.add('edittext {justify: "right", properties: {name: "letter_max_size_box", enterKeySignalsOnChange: true}}'); 
    letter_max_size_box.text = "20"; 
    letter_max_size_box.preferredSize.width = 64; 

var letter_size_reset = group3.add("button", undefined, undefined, {name: "letter_size_reset"}); 
    letter_size_reset.text = "Reset"; 
    letter_size_reset.alignment = ["left","top"];
	
	coupleSlider(letter_max_size_slider, letter_max_size_box, 1);
	
	letter_size_reset.onClick = function() {
		letter_min_size_slider.value = 16;
		letter_min_size_box.text = "16";
		letter_max_size_slider.value = 20;
		letter_max_size_box.text = "20";
	}

// LETTER_SETTINGS
// ===============
var divider2 = letter_settings.add("panel", undefined, undefined, {name: "divider2"}); 
    divider2.alignment = "fill"; 

// GROUP4
// ======
var group4 = letter_settings.add("group", undefined, {name: "group4"}); 
    group4.orientation = "row"; 
    group4.alignChildren = ["left","center"]; 
    group4.spacing = 10; 
    group4.margins = 0; 

var statictext4 = group4.add("statictext", undefined, undefined, {name: "statictext4"}); 
    statictext4.text = "Letters:"; 
    statictext4.preferredSize.width = 64; 

var letter_caps = group4.add("radiobutton", undefined, undefined, {name: "letter_caps"}); 
    letter_caps.text = "CAPS";

var letter_small = group4.add("radiobutton", undefined, undefined, {name: "letter_small"}); 
    letter_small.text = "small"; 

var letter_mixed = group4.add("radiobutton", undefined, undefined, {name: "letter_mixed"}); 
    letter_mixed.text = "MiXeD"; 

var letter_numbers = group4.add("checkbox", undefined, undefined, {name: "letter_numbers"}); 
    letter_numbers.text = "Numbers";
	
var divider_custom = group4.add("panel", undefined, undefined, {name: "divider_custom"}); 
    divider_custom.alignment = "fill";
	
var letter_custom = group4.add("radiobutton", undefined, undefined, {name: "letter_custom"}); 
    letter_custom.text = "Custom";

// GROUP5
// ======
var group5 = letter_settings.add("group", undefined, {name: "group5"}); 
    group5.orientation = "row"; 
    group5.alignChildren = ["left","center"]; 
    group5.spacing = 10; 
    group5.margins = 0;
	group5.enabled = false;

var statictext5 = group5.add("statictext", undefined, undefined, {name: "statictext5"}); 
    statictext5.preferredSize.width = 64; 

var letter_custom_regex = group5.add('edittext {properties: {name: "letter_custom_regex"}}');
    letter_custom_regex.text = "A-Za-z0-9"; 
    letter_custom_regex.preferredSize.width = 320; 

var letter_custom_reset = group5.add("button", undefined, undefined, {name: "letter_custom_reset"});
    letter_custom_reset.text = "Default"; 
	
	coupleEnable(letter_custom, group5);

// PANEL1
// ======
var panel1 = dialog.add("panel", undefined, undefined, {name: "panel1"}); 
    panel1.text = "Positioning"; 
    panel1.preferredSize.width = 512; 
    panel1.orientation = "column"; 
    panel1.alignChildren = ["left","top"]; 
    panel1.spacing = 10; 
    panel1.margins = 10; 

// GROUP6
// ======
var group6 = panel1.add("group", undefined, {name: "group6"}); 
    group6.orientation = "row"; 
    group6.alignChildren = ["left","center"]; 
    group6.spacing = 10; 
    group6.margins = 0; 

var statictext6 = group6.add("statictext", undefined, undefined, {name: "statictext6"}); 
    statictext6.text = "Random:"; 
    statictext6.preferredSize.width = 64; 

var position_random = group6.add("checkbox", undefined, undefined, {name: "position_random"}); 
    position_random.text = "Position"; 
    position_random.value = true; 

var rotation_random = group6.add("checkbox", undefined, undefined, {name: "rotation_random"}); 
    rotation_random.text = "Rotation"; 
    rotation_random.value = true; 

var divider3 = group6.add("panel", undefined, undefined, {name: "divider3"}); 
    divider3.alignment = "fill"; 

var position_reset = group6.add("button", undefined, undefined, {name: "position_reset"}); 
    position_reset.text = "Reset Position"; 

var rotation_reset = group6.add("button", undefined, undefined, {name: "rotation_reset"}); 
    rotation_reset.text = "Reset Rotation"; 

// GROUP7
// ======
var group7 = panel1.add("group", undefined, {name: "group7"}); 
    group7.orientation = "row"; 
    group7.alignChildren = ["left","center"]; 
    group7.spacing = 10; 
    group7.margins = 0; 

var statictext7 = group7.add("statictext", undefined, undefined, {name: "statictext7"}); 
    statictext7.text = "Position:"; 
    statictext7.preferredSize.width = 64; 

var statictext8 = group7.add("statictext", undefined, undefined, {name: "statictext8"}); 
    statictext8.text = "X:"; 

var position_from_x = group7.add('edittext {properties: {name: "position_from_x"}}'); 
    position_from_x.text = "0"; 
    position_from_x.preferredSize.width = 64; 

var statictext9 = group7.add("statictext", undefined, undefined, {name: "statictext9"}); 
    statictext9.text = "to"; 

var position_to_x = group7.add('edittext {properties: {name: "position_to_x"}}'); 
    position_to_x.text = activeDocument.width.as("px"); 
    position_to_x.preferredSize.width = 64; 

var divider4 = group7.add("panel", undefined, undefined, {name: "divider4"}); 
    divider4.alignment = "fill"; 

var statictext10 = group7.add("statictext", undefined, undefined, {name: "statictext10"}); 
    statictext10.text = "Y:"; 

var position_from_y = group7.add('edittext {properties: {name: "position_from_y"}}'); 
    position_from_y.text = "0"; 
    position_from_y.preferredSize.width = 64; 

var statictext11 = group7.add("statictext", undefined, undefined, {name: "statictext11"}); 
    statictext11.text = "to"; 

var position_to_y = group7.add('edittext {properties: {name: "position_to_y"}}'); 
    position_to_y.text = activeDocument.height.as("px"); 
    position_to_y.preferredSize.width = 64;
	
	coupleEnable(position_random, [position_to_x, position_to_y]);
	
	position_reset.onClick = function() {
		position_from_x.text = "0";
		position_to_x.text = activeDocument.width.as("px"); 
		position_from_y.text = "0";
		position_to_y.text = activeDocument.height.as("px"); 
	}

// GROUP8
// ======
var group8 = panel1.add("group", undefined, {name: "group8"}); 
    group8.orientation = "row"; 
    group8.alignChildren = ["left","center"]; 
    group8.spacing = 10; 
    group8.margins = 0; 

var statictext12 = group8.add("statictext", undefined, undefined, {name: "statictext12"}); 
    statictext12.text = "Rotation:"; 
    statictext12.preferredSize.width = 64; 

var rotation_from = group8.add('edittext {properties: {name: "rotation_from"}}'); 
    rotation_from.text = "0"; 
    rotation_from.preferredSize.width = 64; 

var statictext13 = group8.add("statictext", undefined, undefined, {name: "statictext13"}); 
    statictext13.text = "to"; 

var rotation_to = group8.add('edittext {properties: {name: "rotation_to"}}'); 
    rotation_to.text = "360"; 
    rotation_to.preferredSize.width = 64; 

var divider5 = group8.add("panel", undefined, undefined, {name: "divider5"}); 
    divider5.alignment = "fill"; 

var statictext14 = group8.add("statictext", undefined, undefined, {name: "statictext14"}); 
    statictext14.text = "Pivot:"; 

var pivot_center = group8.add("radiobutton", undefined, undefined, {name: "pivot_center"}); 
    pivot_center.text = "Center";

var pivot_corner = group8.add("radiobutton", undefined, undefined, {name: "pivot_corner"}); 
    pivot_corner.text = "Top Left";
	
	coupleEnable(rotation_random, rotation_to);
	
	rotation_reset.onClick = function() {
		pivot_center.value = true;
		rotation_from.text = "0"; 
		rotation_to.text = "360"; 
	}

// PANEL2
// ======
var panel2 = dialog.add("panel", undefined, undefined, {name: "panel2"}); 
    panel2.text = "Colors"; 
    panel2.preferredSize.width = 512; 
    panel2.orientation = "column"; 
    panel2.alignChildren = ["left","top"]; 
    panel2.spacing = 10; 
    panel2.margins = 10; 

// GROUP9
// ======
var group9 = panel2.add("group", undefined, {name: "group9"}); 
    group9.orientation = "row"; 
    group9.alignChildren = ["left","center"]; 
    group9.spacing = 10; 
    group9.margins = 0; 

var statictext15 = group9.add("statictext", undefined, undefined, {name: "statictext15"}); 
    statictext15.text = "Colors:"; 
    statictext15.preferredSize.width = 64; 

var colors_all = group9.add("radiobutton", undefined, undefined, {name: "colors_all"}); 
    colors_all.text = "All";

var colors_gray = group9.add("radiobutton", undefined, undefined, {name: "colors_gray"}); 
    colors_gray.text = "Grayscale"; 

var colors_mono = group9.add("radiobutton", undefined, undefined, {name: "colors_mono"}); 
    colors_mono.text = "Monochrome"; 

var colors_mono_color_array = ["Red","Green","Blue"]; 
var colors_mono_color = group9.add("dropdownlist", undefined, undefined, {name: "colors_mono_color", items: colors_mono_color_array}); 
    colors_mono_color.enabled = false; 
    colors_mono_color.selection = 0; 

var colors_custom = group9.add("radiobutton", undefined, undefined, {name: "colors_custom"}); 
    colors_custom.text = "Custom";
	
	coupleEnable(colors_mono, colors_mono_color);

// GROUP10
// =======
var group10 = panel2.add("group", undefined, {name: "group10"}); 
    group10.enabled = false; 
    group10.orientation = "row"; 
    group10.alignChildren = ["left","center"]; 
    group10.spacing = 10; 
    group10.margins = 0; 

var statictext16 = group10.add("statictext", undefined, undefined, {name: "statictext16"}); 
    statictext16.preferredSize.width = 64; 

var statictext17 = group10.add("statictext", undefined, undefined, {name: "statictext17"}); 
    statictext17.text = "Red:"; 
    statictext17.preferredSize.width = 48; 

var colors_red_from_slider = group10.add("slider", undefined, undefined, undefined, undefined, {name: "colors_red_from_slider"}); 
    colors_red_from_slider.minvalue = 0; 
    colors_red_from_slider.maxvalue = 255; 
    colors_red_from_slider.value = 0;
	colors_red_from_slider.preferredSize.width = 98; 

var colors_red_from_box = group10.add('edittext {properties: {name: "colors_red_from_box"}}'); 
    colors_red_from_box.text = "0"; 
    colors_red_from_box.preferredSize.width = 48;

var statictext18 = group10.add("statictext", undefined, undefined, {name: "statictext18"}); 
    statictext18.text = "to"; 

var colors_red_to_slider = group10.add("slider", undefined, undefined, undefined, undefined, {name: "colors_red_to_slider"}); 
    colors_red_to_slider.minvalue = 0; 
    colors_red_to_slider.maxvalue = 255; 
    colors_red_to_slider.value = 255; 
	colors_red_to_slider.preferredSize.width = 98;

var colors_red_to_box = group10.add('edittext {properties: {name: "colors_red_to_box"}}'); 
    colors_red_to_box.text = "255"; 
    colors_red_to_box.preferredSize.width = 48;
	
	coupleSlider(colors_red_from_slider, colors_red_from_box, 0);
	coupleSlider(colors_red_to_slider, colors_red_to_box, 0);

// GROUP11
// =======
var group11 = panel2.add("group", undefined, {name: "group11"}); 
    group11.enabled = false; 
    group11.orientation = "row"; 
    group11.alignChildren = ["left","center"]; 
    group11.spacing = 10; 
    group11.margins = 0; 

var statictext19 = group11.add("statictext", undefined, undefined, {name: "statictext19"}); 
    statictext19.preferredSize.width = 64; 

var statictext20 = group11.add("statictext", undefined, undefined, {name: "statictext20"}); 
    statictext20.text = "Green:"; 
    statictext20.preferredSize.width = 48; 

var colors_green_from_slider = group11.add("slider", undefined, undefined, undefined, undefined, {name: "colors_green_from_slider"}); 
    colors_green_from_slider.minvalue = 0; 
    colors_green_from_slider.maxvalue = 255; 
    colors_green_from_slider.value = 0; 
	colors_green_from_slider.preferredSize.width = 98;

var colors_green_from_box = group11.add('edittext {properties: {name: "colors_green_from_box"}}'); 
    colors_green_from_box.text = "0"; 
    colors_green_from_box.preferredSize.width = 48; 

var statictext21 = group11.add("statictext", undefined, undefined, {name: "statictext21"}); 
    statictext21.text = "to"; 

var colors_green_to_slider = group11.add("slider", undefined, undefined, undefined, undefined, {name: "colors_green_to_slider"}); 
    colors_green_to_slider.minvalue = 0; 
    colors_green_to_slider.maxvalue = 255; 
    colors_green_to_slider.value = 255; 
	colors_green_to_slider.preferredSize.width = 98;

var colors_green_to_box = group11.add('edittext {properties: {name: "colors_green_to_box"}}'); 
    colors_green_to_box.text = "255"; 
    colors_green_to_box.preferredSize.width = 48;
	
	coupleSlider(colors_green_from_slider, colors_green_from_box, 0);
	coupleSlider(colors_green_to_slider, colors_green_to_box, 0);

// GROUP12
// =======
var group12 = panel2.add("group", undefined, {name: "group12"}); 
    group12.enabled = false; 
    group12.orientation = "row"; 
    group12.alignChildren = ["left","center"]; 
    group12.spacing = 10; 
    group12.margins = 0; 

var statictext22 = group12.add("statictext", undefined, undefined, {name: "statictext22"}); 
    statictext22.preferredSize.width = 64; 

var statictext23 = group12.add("statictext", undefined, undefined, {name: "statictext23"}); 
    statictext23.text = "Blue:"; 
    statictext23.preferredSize.width = 48; 

var colors_blue_from_slider = group12.add("slider", undefined, undefined, undefined, undefined, {name: "colors_blue_from_slider"}); 
    colors_blue_from_slider.minvalue = 0; 
    colors_blue_from_slider.maxvalue = 255; 
    colors_blue_from_slider.value = 0;
	colors_blue_from_slider.preferredSize.width = 98;

var colors_blue_from_box = group12.add('edittext {properties: {name: "colors_blue_from_box"}}'); 
    colors_blue_from_box.text = "0"; 
    colors_blue_from_box.preferredSize.width = 48; 

var statictext24 = group12.add("statictext", undefined, undefined, {name: "statictext24"}); 
    statictext24.text = "to"; 

var colors_blue_to_slider = group12.add("slider", undefined, undefined, undefined, undefined, {name: "colors_blue_to_slider"}); 
    colors_blue_to_slider.minvalue = 0; 
    colors_blue_to_slider.maxvalue = 255; 
    colors_blue_to_slider.value = 255; 
	colors_blue_to_slider.preferredSize.width = 98;

var colors_blue_to_box = group12.add('edittext {properties: {name: "colors_blue_to_box"}}'); 
    colors_blue_to_box.text = "255"; 
    colors_blue_to_box.preferredSize.width = 48;
	
	coupleSlider(colors_blue_from_slider, colors_blue_from_box, 0);
	coupleSlider(colors_blue_to_slider, colors_blue_to_box, 0);
	
// GROUP15
// =======
var group15 = panel2.add("group", undefined, {name: "group15"}); 
    group15.enabled = false; 
    group15.orientation = "row"; 
    group15.alignChildren = ["left","center"]; 
    group15.spacing = 10; 
    group15.margins = 0; 

var statictextAlpha = group15.add("statictext", undefined, undefined, {name: "statictextAlpha"}); 
    statictextAlpha.preferredSize.width = 64; 

var statictextAlpha1 = group15.add("statictext", undefined, undefined, {name: "statictextAlpha1"}); 
    statictextAlpha1.text = "Alpha:"; 
    statictextAlpha1.preferredSize.width = 48; 

var colors_alpha_from_slider = group15.add("slider", undefined, undefined, undefined, undefined, {name: "colors_alpha_from_slider"}); 
    colors_alpha_from_slider.minvalue = 0; 
    colors_alpha_from_slider.maxvalue = 100; 
    colors_alpha_from_slider.value = 0; 
	colors_alpha_from_slider.preferredSize.width = 98;

var colors_alpha_from_box = group15.add('edittext {properties: {name: "colors_alpha_from_box"}}'); 
    colors_alpha_from_box.text = "0"; 
    colors_alpha_from_box.preferredSize.width = 48; 

var statictextAlpha2 = group15.add("statictext", undefined, undefined, {name: "statictextAlpha2"}); 
    statictextAlpha2.text = "to"; 

var colors_alpha_to_slider = group15.add("slider", undefined, undefined, undefined, undefined, {name: "colors_alpha_to_slider"}); 
    colors_alpha_to_slider.minvalue = 0; 
    colors_alpha_to_slider.maxvalue = 100; 
    colors_alpha_to_slider.value = 100; 
	colors_alpha_to_slider.preferredSize.width = 98;

var colors_alpha_to_box = group15.add('edittext {properties: {name: "colors_alpha_to_box"}}'); 
    colors_alpha_to_box.text = "100"; 
    colors_alpha_to_box.preferredSize.width = 48;
	
	coupleSlider(colors_alpha_from_slider, colors_alpha_from_box, 0);
	coupleSlider(colors_alpha_to_slider, colors_alpha_to_box, 0);
	
	coupleEnable(colors_custom, [group10, group11, group12, group15]);
	
// PANEL3
// ======
var panel3 = dialog.add("panel", undefined, undefined, {name: "panel2"}); 
    panel3.text = "Layers"; 
    panel3.preferredSize.width = 512; 
    panel3.orientation = "column"; 
    panel3.alignChildren = ["left","top"]; 
    panel3.spacing = 10; 
    panel3.margins = 10; 

// GROUP14
// ======
var group14 = panel3.add("group", undefined, {name: "group14"}); 
    group14.orientation = "row"; 
    group14.alignChildren = ["left","center"]; 
    group14.spacing = 10; 
    group14.margins = 0;
	
var statictextLayer = group2.add("statictext", undefined, undefined, {name: "statictextLayer"}); 
    statictextLayer.text = "Layer Mode:"; 
    statictextLayer.preferredSize.width = 64; 
	
var keep = group14.add("radiobutton", undefined, undefined, {name: "keep"}); 
    keep.text = "Keep as Text";
	
var rasterize = group14.add("radiobutton", undefined, undefined, {name: "rasterize"}); 
    rasterize.text = "Rasterize";
	
var merge = group14.add("radiobutton", undefined, undefined, {name: "merge"}); 
    merge.text = "Merge";
	
var fillBackground = group14.add("radiobutton", undefined, undefined, {name: "fillBackground"}); 
    fillBackground.text = "Fill Background";

// GROUP13
// =======
var group13 = dialog.add("group", undefined, {name: "group13"}); 
    group13.orientation = "row"; 
    group13.alignChildren = ["left","center"]; 
    group13.spacing = 10; 
    group13.margins = 0; 
    group13.alignment = ["right","top"]; 

var cancel = group13.add("button", undefined, undefined, {name: "cancel"}); 
    cancel.text = "Cancel"; 
    cancel.alignment = ["left","top"]; 

var generate = group13.add("button", undefined, undefined, {name: "generate"}); 
    generate.text = "Generate"; 
    generate.alignment = ["left","bottom"];
	
letter_caps.value = true;
pivot_center.value = true;
colors_all.value = true;
keep.value = true;
	
// Progress Dialog
	
var progress = new Window("palette", "Generating Letters...", undefined, {closeButton: false});
    progress.orientation = "column"; 
    progress.alignChildren = ["center","top"]; 
    progress.spacing = 10; 
    progress.margins = 16;
	
var group20 = progress.add("group", undefined, {name: "group20"}); 
    group20.orientation = "row"; 
    group20.alignChildren = ["left","center"]; 
    group20.spacing = 10; 
    group20.margins = 0; 
    group20.alignment = ["right","top"]; 
	
var progressbar = group20.add("progressbar", undefined, undefined, undefined, undefined, {name: "progressbar"}); 
    progressbar.minvalue = 0; 
    progressbar.maxvalue = 100; 
    progressbar.value = 0; 
	progressbar.preferredSize.width = 256;
	
var percentage = group20.add("statictext", undefined, undefined, {name: "percentage"}); 
    percentage.text = "0%"; 
    percentage.preferredSize.width = 64; 

	generate.onClick = function() {		
		var settings = {
			count: parseInt(letter_count_box.text),
			font: ScriptUI.newFont(font_array[parseInt(font.selection)], font_bold.value ? (font_italic.value ? 3 : 1) : (font_italic.value ? 2 : 0), 12)
				.toString().split(":")[0],
			size: [parseFloat(letter_min_size_box.text), parseFloat(letter_max_size_box.text)],
			letters: "",
			position: position_random.value ? [{ x: parseFloat(position_from_x.text), y: parseFloat(position_from_y.text) },
												{ x: parseFloat(position_to_x.text), y: parseFloat(position_to_y.text) }] :
											{ x: parseFloat(position_from_x.text), y: parseFloat(position_from_y.text) },
			rotation: rotation_random.value ? [ parseFloat(rotation_from.text) , parseFloat(rotation_to.text) ] :
											parseFloat(rotation_from.text),
			pivotCenter: pivot_center.value,
			colors: {},
			grayscale: colors_gray.value,
			rasterize: rasterize.value,
			merge: merge.value,
			fillBackground: fillBackground.value
		}
		
		var letterRegex = letter_numbers.value ? "0-9" : "";
		if (letter_caps.value) letterRegex += "A-Z";
		else if (letter_small.value) letterRegex += "a-z";
		else if (letter_mixed.value) letterRegex += "A-Za-z";
		else letterRegex = letter_custom_regex.text;
		
		letterRegex = letterRegex.replace(/-/g, "");
		for (var i = 0; i < letterRegex.length; i += 2) {
			if (i+1 >= letterRegex.length) letterRegex += letterRegex[i];
			else {
				for (var c = letterRegex.charCodeAt(i); c < letterRegex.charCodeAt(i+1); c++)
					settings.letters += String.fromCharCode(c);
			}
		}
		
		if (colors_all.value) {
			settings.colors.r = [0, 255];
			settings.colors.g = [0, 255];
			settings.colors.b = [0, 255];
		}
		if (colors_mono.value) {
			settings.colors.r = [0, 0];
			settings.colors.g = [0, 0];
			settings.colors.b = [0, 0];
			switch(colors_mono_color.selection) {
				case "0":
					settings.colors.r[1] = 255;
					break;
				case "1":
					settings.colors.g[1] = 255;
					break;
				case "2":
					settings.colors.b[1] = 255;
					break;
			}
		}
		if (colors_custom.value) {
			settings.colors.r = [parseInt(colors_red_from_box.text), parseInt(colors_red_to_box.text)];
			settings.colors.g = [parseInt(colors_green_from_box.text), parseInt(colors_green_to_box.text)];
			settings.colors.b = [parseInt(colors_blue_from_box.text), parseInt(colors_blue_to_box.text)];
			settings.colors.a = [parseInt(colors_alpha_from_box.text), parseInt(colors_alpha_to_box.text)];
		}
		
		dialog.close();
		progress.show();
		
		try {
			generateLetters(settings);
		} catch(e) {
			alert("An Error occured: " + e.message);
		}
		
		progress.close();
	}

dialog.show();

function generateLetters(settings) {
	var layers = activeDocument.artLayers;
	
	progressbar.maxvalue = settings.count;
	
	if (settings.fillBackground || settings.merge) {
		progressbar.maxvalue++;
		var layer = layers.add();
		layer.name = "Random Letters";
		if (settings.fillBackground )
				activeDocument.selection.fill(backgroundColor );
			
		progressbar.value++;
	}
	
	for (var i = 0; i < settings.count; i++) {
		var content = settings.letters[Math.floor(Math.random()*settings.letters.length)];
		
		var layer = layers.add();
		layer.kind = LayerKind.TEXT;
		layer.textItem.name = content;
		layer.textItem.contents = content;
		
		layer.textItem.font = settings.font;
		layer.textItem.size = Math.random()*(settings.size[1]-settings.size[0])+settings.size[0];
		if (typeof settings.rotation == "number") layer.rotate(settings.rotation, settings.pivotCenter ? AnchorPosition.MIDDLECENTER : AnchorPosition.TOPLEFT);
		else layer.rotate((Math.random()*(settings.rotation[1] - settings.rotation[0]) + settings.rotation[0]),
			settings.pivotCenter ? AnchorPosition.MIDDLECENTER : AnchorPosition.TOPLEFT);
		
		var color = new SolidColor();
		if (settings.grayscale) {
			color.rgb.red = color.rgb.green = color.rgb.blue = Math.round(Math.random()*255);
		} else {
			color.rgb.red = Math.round(Math.random()*(settings.colors.r[1] - settings.colors.r[0]) + settings.colors.r[0]);
			color.rgb.green = Math.round(Math.random()*(settings.colors.g[1] - settings.colors.g[0]) + settings.colors.g[0]);;
			color.rgb.blue = Math.round(Math.random()*(settings.colors.b[1] - settings.colors.b[0]) + settings.colors.b[0]);;
		}
		layer.textItem.color = color;
		
		if (settings.colors.a) {
			layer.opacity = Math.random()*(settings.colors.a[1]-settings.colors.a[0])+settings.colors.a[0];
		}
		
		var bounds = [layer.bounds[0].as("px")*0.5+layer.bounds[2].as("px")*0.5, layer.bounds[1].as("px")*0.5+layer.bounds[3].as("px")*0.5];
		layer.translate(-bounds[0], -bounds[1]);
		if (!(settings.position instanceof Array)) layer.translate(settings.position.x, settings.position.y);
		else layer.translate(Math.random()*(settings.position[1].x - settings.position[0].x) + settings.position[0].x,
			Math.random()*(settings.position[1].y - settings.position[0].y) + settings.position[0].y);
			
		if (settings.rasterize || settings.merge || settings.fillBackground) layer.rasterize(RasterizeType.TEXTCONTENTS);
		if (settings.merge || settings.fillBackground) layer.merge();
		
		progressbar.value++;
		percentage = Math.round(i / settings.count * 100) + "%";
	}
}

For an Example: https://imgur.com/a/3GmRVNH