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Sploop.io Zoom hack

Allows to change zoom of the game using mouse wheels

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  1. // ==UserScript==
  2. // @name Sploop.io Zoom hack
  3. // @author Murka
  4. // @description Allows to change zoom of the game using mouse wheels
  5. // @icon https://sploop.io/img/ui/favicon.png
  6. // @version 0.5
  7. // @match *://sploop.io/*
  8. // @run-at document-start
  9. // @grant none
  10. // @license MIT
  11. // @namespace https://greasyfork.org/users/919633
  12. // ==/UserScript==
  13. /* jshint esversion:6 */
  14.  
  15. /*
  16.     Author: Murka
  17.     Github: https://github.com/Murka007
  18.     Discord: https://discord.gg/sG9cyfGPj5
  19.     Greasyfork: https://greasyfork.org/en/users/919633
  20. */
  21.  
  22. (function() {
  23.     "use strict";
  24.  
  25.     const log = console.log;
  26.     function createHook(target, prop, callback) {
  27.         const symbol = Symbol(prop);
  28.         Object.defineProperty(target, prop, {
  29.             get() {
  30.                 return this[symbol];
  31.             },
  32.             set(value) {
  33.                 callback(this, symbol, value);
  34.             },
  35.             configurable: true
  36.         })
  37.     }
  38.  
  39.     function findKey(target, value) {
  40.         for (const key in target) {
  41.             if (target[key] === value) return key;
  42.         }
  43.         return null;
  44.     }
  45.  
  46.     const CONFIG = {
  47.         maxWidth: {
  48.             key: null,
  49.             value: 1824 + 100 * 6
  50.         },
  51.         maxHeight: {
  52.             key: null,
  53.             value: 1026 + 100 * 6
  54.         }
  55.     };
  56.  
  57.     // "max_players", is the only way to get access to the max_width and max_height properties
  58.     // otherwise I would have to hook setTransform or Math.max
  59.     createHook(Object.prototype, "max_players", function(that, symbol, value) {
  60.         delete Object.prototype.max_players;
  61.         that.max_players = value;
  62.  
  63.         const { maxWidth, maxHeight } = CONFIG;
  64.         maxWidth.key = findKey(that, 1824);
  65.         maxHeight.key = findKey(that, 1026);
  66.  
  67.         Object.defineProperty(that, maxWidth.key, { get: () => maxWidth.value })
  68.         Object.defineProperty(that, maxHeight.key, { get: () => maxHeight.value })
  69.     })
  70.  
  71.     let wheels = 0;
  72.     const scaleFactor = 150;
  73.     window.addEventListener("wheel", function(event) {
  74.         const { maxWidth, maxHeight } = CONFIG;
  75.         if (event.target.id !== "game-canvas" || maxWidth.key === null || maxHeight.key === null) return;
  76.  
  77.         // Used to create a small gap, so users could easily find the default scale
  78.         if (maxWidth.value === 1824 && maxHeight.value === 1026) wheels += 1;
  79.         if (wheels % 5 !== 0) return;
  80.  
  81.         const zoom = event.deltaY > 0 ? -scaleFactor : scaleFactor;
  82.         maxWidth.value += zoom;
  83.         maxHeight.value += zoom;
  84.         window.dispatchEvent(new Event("resize"));
  85.     })
  86.  
  87. })();