Adapted from Shadow Selection by Anveshak. Create dynamic text shadows for highlighted text using built-in algorithms or perhaps write your very own!
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/**
The MIT License (MIT)
Copyright (c) 2019 Anveshak
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
**/
// ==UserScript==
// @name Rainbow Selection
// @author Anveshak, Fractalism
// @description Adapted from Shadow Selection by Anveshak. Create dynamic text shadows for highlighted text using built-in algorithms or perhaps write your very own!
// @include *
// @version 0.0.1
// @license MIT
// @copyright 2019, Anveshak
// @icon http://oi63.tinypic.com/142f1tx.jpg
// @namespace Fractalism
// ==/UserScript==
(function(){
'use strict';
var style=document.createElement("style");
//For Firefox (Gecko) Browser
style.innerHTML = " ::-moz-selection { color: #000; background: none repeat scroll 100% 0% transparent;text-shadow: 0px 0px 2px #0048FF;} a::selection { color: #000; background: none repeat scroll 0% 0% transparent;text-shadow: 2px 2px 2px #0048FF;}";
//For Chrome (Blink) Browser
style.innerHTML += " ::selection { color: #000; background: none repeat scroll 0% 0% transparent;text-shadow: 2px 0px 2px #0048FF;} input::selection { color: #3356C6; background: none repeat scroll 0% 0% transparent;} a::selection { color: #000; background: none repeat scroll 0% 0% transparent;text-shadow: 2px 0px 2px #0048FF;}";
//For WebKit Browser
style.innerHTML += " ::-webkit-selection { color: #000; background: none repeat scroll 0% 0% transparent;text-shadow: 0px 0px 2px #0048FF;} a::selection { color: #000; background: none repeat scroll 0% 0% transparent;text-shadow: 2px 2px 2px #0048FF;}";
//For Other Browsers
style.innerHTML += " ::-ms-selection { color: #000; background: none repeat scroll 0% 0% transparent;text-shadow: 0px 0px 2px #0048FF;} a::selection { color: #000; background: none repeat scroll 0% 0% transparent;text-shadow: 2px 2px 2px #0048FF;}";
style.innerHTML += " ::-o-selection { color: #000; background: none repeat scroll 0% 0% transparent;text-shadow: 0px 0px 2px #0048FF;} a::selection { color: #000; background: none repeat scroll 0% 0% transparent;text-shadow: 2px 2px 2px #0048FF;}";
document.body.appendChild(style);
// Parameters
// browser: Firefox=1, Chrome=2, WebKit=3, Other=4, or use -1 to try them all
// shadow_count: number of text shadows to apply
// x_offset, y_offset: relative position of each text shadow in pixels, stored as array (right and down are the positive directions)
// blur: blur radius of each shadow
// color: initial color of each shadow in RGBA, where 0<=R,G,B<=255 and 0<=A<=1
// algorithm: algorithm to use for updating text shadows (enclosed within a function for technical reasons)
// exec_interval: update text shadows every x milliseconds
const browser = 2
const shadow_count = 3
const x_offset = [-2,-1,3]
const y_offset = [-4,5,-3]
const blur = [5,5,5]
const color = [{R:255, G:0, B:0, A:1},{R:0,G:255,B:0,A:1},{R:0,G:0,B:255,A:1}]
const algorithm = function() {
orbit() // change algorithm here
}
const exec_interval = 100
// Algorithms
// Please store algorithm-specific variables as static variables as in the default algorithm
// Default Algorithm:
// Made for one shadow, can support multiple shadows but the results may not be too impressive
// RGB(0,0,0) -> RGB(255,0,0) -> RGB(255,255,0) -> RGB(255,255,255) -> RGB(0,255,255) -> RGB(0,0,255) -> RGB(0,0,0) -> start over
var default_algorithm = function def_algo() {
// Initialize static variables upon first execution
if(typeof def_algo.mode === "undefined") {
def_algo.mode = 1
def_algo.delta = 20 // change amount per cycle
}
for(let i = 0; i < shadow_count; ++i) {
let colors = shadow_list[i].color
switch(def_algo.mode) {
case 1:
(colors.R < 255) ? (colors.R = Math.min(colors.R + def_algo.delta, 255)) : (++def_algo.mode)
break;
case 2:
(colors.G < 255) ? (colors.G = Math.min(colors.G + def_algo.delta, 255)) : (++def_algo.mode)
break;
case 3:
(colors.B < 255) ? (colors.B = Math.min(colors.B + def_algo.delta, 255)) : (++def_algo.mode)
break;
case 4:
(colors.R > 0) ? (colors.R = Math.max(colors.R - def_algo.delta, 0)) : (++def_algo.mode)
break;
case 5:
(colors.G > 0) ? (colors.G = Math.max(colors.G - def_algo.delta, 0)) : (++def_algo.mode)
break;
case 6:
(colors.B > 0) ? (colors.B = Math.max(colors.B - def_algo.delta, 0)) : (def_algo.mode = 1)
break;
}
}
}
// Discrete Cyclic:
// Cycle between red, green, and blue
var discrete_cyclic = function() {
for(let i = 0; i < shadow_count; ++i) {
let colors = shadow_list[i].color
if(colors.R) {
colors.R = 0
colors.G = 255
}else if(colors.G){
colors.G = 0
colors.B = 255
}else{
colors.B = 0
colors.R = 255
}
}
}
// Randomize:
// Assign random color coordinates
var randomize = function() {
for(let i = 0; i < shadow_count; ++i) {
let colors = shadow_list[i].color
colors.R = Math.floor(Math.random() * 256)
colors.G = Math.floor(Math.random() * 256)
colors.B = Math.floor(Math.random() * 256)
colors.A = Math.random()
}
}
// Orbit:
// Shadows orbit around the letters counterclockwise
// dir: 0=left 1=down 2=right 3=up
// NOTE: Initial x,y offsets must be nonzero
var orbit = function orb() {
if(typeof orb.star === "undefined") {
orb.star = []
for(let i = 0; i < shadow_count; ++i){
let star = shadow_list[i]
orb.star[i] = ({
x_max: (star.x_offset > 0) ? (star.x_offset) : (-star.x_offset),
y_max: (star.y_offset > 0) ? (star.y_offset) : (-star.y_offset),
dir: (star.x_offset > 0) ? ((star.y_offset > 0) ? (0) : (3)) : ((star.y_offset > 0) ? (1) : (2))
})
}
}
for(let i = 0; i < shadow_count; ++i) {
var shadow = shadow_list[i]
var star = orb.star[i]
switch(star.dir) {
case 0:
(shadow.x_offset > -star.x_max) ? (--shadow.x_offset) : (++star.dir, --i)
break;
case 1:
(shadow.y_offset < star.y_max) ? (++shadow.y_offset) : (++star.dir, --i)
break;
case 2:
(shadow.x_offset < star.x_max) ? (++shadow.x_offset) : (++star.dir, --i)
break;
case 3:
(shadow.y_offset > -star.y_max) ? (--shadow.y_offset) : (star.dir = 0, --i)
break;
}
}
}
// Main program
var shadow = function(x_offset, y_offset, blur, color) {
return {
x_offset: x_offset,
y_offset: y_offset,
blur: blur,
color: color
}
}
var shadow_list = []
for(let i = 0; i < shadow_count; ++i) {
shadow_list.push(shadow(x_offset[i], y_offset[i], blur[i], color[i]))
}
// Deprecated function, converts number into hex color code
// var hex_adjust = function(n) {
// var hex = n.toString(16)
// var pad = "0".repeat(6 - hex.length)
// return "#" + pad + hex
// }
var update_shadows = function() {
algorithm()
var shadow_str = ""
for(let i = 0; i < shadow_count; ++i){
if(i > 0) shadow_str += ","
shadow_str += shadow_list[i].x_offset + "px "
shadow_str += shadow_list[i].y_offset + "px "
shadow_str += shadow_list[i].blur + "px "
shadow_str += `rgba(${shadow_list[i].color.R}, ${shadow_list[i].color.G}, ${shadow_list[i].color.B}, ${shadow_list[i].color.A})`
}
var style_str = ""
if(browser == 1 || browser == -1) { // Firefox
style_str += `::-moz-selection { color: #000; background: none repeat scroll 100% 0% transparent; text-shadow: ${shadow_str};}
a::selection { color: #000; background: none repeat scroll 0% 0% transparent; text-shadow: ${shadow_str};}`
}
if(browser == 2 || browser == -1) { // Chrome
style_str += `::selection { color: #000; background: none repeat scroll 0% 0% transparent; text-shadow: ${shadow_str};}
input::selection { color: #3356C6; background: none repeat scroll 0% 0% transparent;}
a::selection { color: #000; background: none repeat scroll 0% 0% transparent; text-shadow: ${shadow_str};}"`
}
if(browser == 3 || browser == -1) { // WebKit
style_str += `::-webkit-selection { color: #000; background: none repeat scroll 0% 0% transparent; text-shadow: ${shadow_str};}
a::selection { color: #000; background: none repeat scroll 0% 0% transparent; text-shadow: ${shadow_str};}`
}
if(browser == 4 || browser == -1) { // Other
style_str += `::-ms-selection { color: #000; background: none repeat scroll 0% 0% transparent; text-shadow: ${shadow_str};}
a::selection { color: #000; background: none repeat scroll 0% 0% transparent; text-shadow: ${shadow_str};}
::-o-selection { color: #000; background: none repeat scroll 0% 0% transparent; text-shadow: ${shadow_str};}
a::selection { color: #000; background: none repeat scroll 0% 0% transparent; text-shadow: ${shadow_str};}`
}
style.innerHTML = style_str
}
// Let the party begin
setInterval(update_shadows, exec_interval)
})()