From 912cbac7982b12986c246719da02b5db1e73441c Mon Sep 17 00:00:00 2001
From: Rudis Muiznieks <rudis@sitosis.com>
Date: Sun, 14 Jun 2020 14:25:28 -0500
Subject: [PATCH] added CRT effect

---
 README.md         |  20 ++++++++
 package-lock.json |  59 +++++++++++++++++++----
 package.json      |  12 +++--
 src/CRT.ts        | 120 ++++++++++++++++++++++++++++++++++++++++++++++
 src/FilmGrain.ts  |   3 +-
 src/IEffect.ts    |   4 ++
 src/Util.ts       |  24 ++++++++++
 src/main.ts       |   1 +
 8 files changed, 227 insertions(+), 16 deletions(-)
 create mode 100644 src/CRT.ts
 create mode 100644 src/IEffect.ts
 create mode 100644 src/Util.ts

diff --git a/README.md b/README.md
index 6dc4f61..be1045d 100644
--- a/README.md
+++ b/README.md
@@ -22,3 +22,23 @@ Takes optional `options` configuration object:
 If no existing `canvasId` is provided then the effect will be applied to the entire browser screen.
 
 You can animate alpha changes with `fg.setAlpha(newValue, step)` where `step` is optional and will determine how quickly the fade in/out will occur.
+
+### CRT
+
+Based on original code from [Alec Lownes](http://aleclownes.com/2017/02/01/crt-display.html).
+
+```
+var crt = new Spooky.CRT({containerId: 'mydiv'});
+fg.execute();
+fg.stop();
+```
+
+Takes required `options` configuration object:
+  - `containerId`: id of the element to apply the CRT effect to (required)
+  - `screenDoorColor`: color of the screen door effect (`#000000`)
+  - `screenDoorSize`: size in pixels of the screen door effect (`2`)
+  - `screenDoorOpacity`: opacity of the screen door effect from 0-1 (`0.25`)
+  - `separationColor`: color of the separation effect (`#000000`)
+  - `separationDistance`: horizontal movement distance in pixels of the separation effect (`5`)
+  - `separationBlur`: blur size in pixels of the separation effect (`1`)
+  - `separationOpacity`: opacity of the separation effect from 0-1 (`0.5`)
diff --git a/package-lock.json b/package-lock.json
index 4d1e73c..8e0fb01 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "spooky.js",
-  "version": "0.0.1",
+  "version": "0.0.2",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -31,6 +31,12 @@
       "integrity": "sha512-7EJYyKTL7tFR8+gDbB6Wwz/arpGa0Mywk1TJbNzKzHtzbwVmY4HR9WqS5VV7dsBUKQmPNr192jHr/VpBluj/hg==",
       "dev": true
     },
+    "@types/uuid": {
+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/@types/uuid/-/uuid-8.0.0.tgz",
+      "integrity": "sha512-xSQfNcvOiE5f9dyd4Kzxbof1aTrLobL278pGLKOZI6esGfZ7ts9Ka16CzIN6Y8hFHE1C7jIBZokULhK1bOgjRw==",
+      "dev": true
+    },
     "JSONStream": {
       "version": "1.3.5",
       "resolved": "https://registry.npmjs.org/JSONStream/-/JSONStream-1.3.5.tgz",
@@ -1178,6 +1184,24 @@
       "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
       "dev": true
     },
+    "source-map-support": {
+      "version": "0.5.19",
+      "resolved": "https://registry.npmjs.org/source-map-support/-/source-map-support-0.5.19.tgz",
+      "integrity": "sha512-Wonm7zOCIJzBGQdB+thsPar0kYuCIzYvxZwlBa87yi/Mdjv7Tip2cyVbLj5o0cFPN4EVkuTwb3GDDyUx2DGnGw==",
+      "dev": true,
+      "requires": {
+        "buffer-from": "^1.0.0",
+        "source-map": "^0.6.0"
+      },
+      "dependencies": {
+        "source-map": {
+          "version": "0.6.1",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
+          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
+          "dev": true
+        }
+      }
+    },
     "stream-browserify": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/stream-browserify/-/stream-browserify-2.0.2.tgz",
@@ -1260,6 +1284,25 @@
         "acorn-node": "^1.2.0"
       }
     },
+    "terser": {
+      "version": "4.7.0",
+      "resolved": "https://registry.npmjs.org/terser/-/terser-4.7.0.tgz",
+      "integrity": "sha512-Lfb0RiZcjRDXCC3OSHJpEkxJ9Qeqs6mp2v4jf2MHfy8vGERmVDuvjXdd/EnP5Deme5F2yBRBymKmKHCBg2echw==",
+      "dev": true,
+      "requires": {
+        "commander": "^2.20.0",
+        "source-map": "~0.6.1",
+        "source-map-support": "~0.5.12"
+      },
+      "dependencies": {
+        "source-map": {
+          "version": "0.6.1",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
+          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
+          "dev": true
+        }
+      }
+    },
     "through": {
       "version": "2.3.8",
       "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
@@ -1303,15 +1346,6 @@
       "integrity": "sha512-MYlEfn5VrLNsgudQTVJeNaQFUAI7DkhnOjdpAp4T+ku1TfQClewlbSuTVHiA+8skNBgaf02TL/kLOvig4y3G8w==",
       "dev": true
     },
-    "uglify-js": {
-      "version": "3.9.2",
-      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.9.2.tgz",
-      "integrity": "sha512-zGVwKslUAD/EeqOrD1nQaBmXIHl1Vw371we8cvS8I6mYK9rmgX5tv8AAeJdfsQ3Kk5mGax2SVV/AizxdNGhl7Q==",
-      "dev": true,
-      "requires": {
-        "commander": "~2.20.3"
-      }
-    },
     "umd": {
       "version": "3.0.3",
       "resolved": "https://registry.npmjs.org/umd/-/umd-3.0.3.tgz",
@@ -1372,6 +1406,11 @@
       "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
       "dev": true
     },
+    "uuid": {
+      "version": "8.1.0",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-8.1.0.tgz",
+      "integrity": "sha512-CI18flHDznR0lq54xBycOVmphdCYnQLKn8abKn7PXUiKUGdEd+/l9LWNJmugXel4hXq7S+RMNl34ecyC9TntWg=="
+    },
     "vm-browserify": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/vm-browserify/-/vm-browserify-1.1.2.tgz",
diff --git a/package.json b/package.json
index b5340ad..926f6ae 100644
--- a/package.json
+++ b/package.json
@@ -1,23 +1,25 @@
 {
   "name": "spooky.js",
-  "version": "0.0.1",
+  "version": "0.0.2",
   "description": "Javascript/CSS effects to make a website spooky.",
   "scripts": {
     "build": "rm -rf ./build && tsc",
     "pack": "browserify build/unpacked/main.js --standalone Spooky > ./build/spooky.js",
-    "minify": "uglifyjs build/spooky.js > build/spooky.min.js",
+    "minify": "terser --compress -- build/spooky.js > build/spooky.min.js",
     "make": "npm run build && npm run pack && npm run minify"
   },
   "dependencies": {
     "core-js": "^3.6.5",
-    "jquery": "^3.5.1"
+    "jquery": "^3.5.1",
+    "uuid": "^8.1.0"
   },
   "devDependencies": {
     "@types/core-js": "^2.5.3",
     "@types/jquery": "^3.3.38",
     "@types/node": "^13.13.5",
+    "@types/uuid": "^8.0.0",
     "browserify": "^16.5.1",
-    "typescript": "^3.8.3",
-    "uglify-js": "^3.9.2"
+    "terser": "^4.7.0",
+    "typescript": "^3.8.3"
   }
 }
diff --git a/src/CRT.ts b/src/CRT.ts
new file mode 100644
index 0000000..6a1572e
--- /dev/null
+++ b/src/CRT.ts
@@ -0,0 +1,120 @@
+// credit: http://aleclownes.com/2017/02/01/crt-display.html
+
+import * as $ from 'jquery';
+import * as uuid from 'uuid';
+import { IEffect } from './IEffect';
+import { rgbColor } from './Util';
+
+export interface CRTOptions {
+  containerId: string;
+  screenDoorColor?: string;
+  screenDoorSize?: number;
+  screenDoorOpacity?: number;
+  separationColor?: string;
+  separationDistance?: number;
+  separationBlur?: number;
+  separationOpacity?: number;
+}
+
+export class CRT implements IEffect {
+  private containerId: string;
+  private styleId: string;
+  private wrapperId: string;
+
+  private separationColor: string;
+  private separationDistance: number;
+  private separationBlur: number;
+  private separationOpacity: number;
+
+  constructor(options: CRTOptions) {
+    this.containerId = options.containerId;
+    this.styleId = `crt${uuid.v4().replace(/-/g, '')}`;
+    this.wrapperId = `crt${uuid.v4().replace(/-/g, '')}`;
+
+    let screenDoorColor = options.screenDoorColor || '#000000';
+    let screenDoorRgb = new rgbColor(screenDoorColor);
+    let screenDoorSize = options.screenDoorSize || 2;
+    if (screenDoorSize < 2) {
+      screenDoorSize = 2;
+    }
+    let screenDoorOpacity = options.screenDoorOpacity || 0.25;
+
+    this.separationColor = options.separationColor || '#000000';
+    this.separationDistance = options.separationDistance || 5;
+    this.separationBlur = options.separationBlur || 1;
+    this.separationOpacity = options.separationOpacity || 0.5;
+
+    const style = $('<style />').attr('id', this.styleId).text(`
+      #${this.wrapperId} {
+        position: relative;
+      }
+      #${this.containerId}::before {
+        content: " ";
+        display: block;
+        position: absolute;
+        top: 0;
+        left: 0;
+        bottom: 0;
+        right: 0;
+        background: linear-gradient(
+          rgba(${screenDoorRgb.toString()}, 0) 50%,
+          rgba(${screenDoorRgb.toString()}, ${screenDoorOpacity}) 50%
+        ), linear-gradient(
+          90deg,
+          rgba(255, 0, 0, 0.06),
+          rgba(0, 255, 0, 0.02),
+          rgba(0, 0, 255, 0.06)
+        );
+        z-index: 2;
+        background-size: 100% ${screenDoorSize}px, 3px 100%;
+        pointer-events: none;
+      }
+      ${this.makeFlickerFrames()}
+      #${this.containerId}::after {
+        content: " ";
+        display: block;
+        position: absolute;
+        top: 0;
+        left: 0;
+        bottom: 0;
+        right: 0;
+        background: rgba(18, 16, 16, 0.1);
+        opacity: 0;
+        z-index: 2;
+        pointer-events: none;
+        animation: flicker_${this.styleId} 0.15s infinite;
+      }
+      ${this.makeSeparationFrames()}
+      #${this.containerId} {
+        animation: separation_${this.styleId} 1.6s infinite;
+      }
+    `).appendTo($('body'));
+  }
+
+  private makeFlickerFrames(): string {
+    let css = `@keyframes flicker_${this.styleId} {`;
+    for(let i = 0; i <= 20; i++) {
+      css += ` ${i * 5}% { opacity: ${Math.random()}; }`;
+    }
+    css += ' }';
+    return css;
+  }
+
+  private makeSeparationFrames(): string {
+    const rgb = new rgbColor(this.separationColor);
+    let css = `@keyframes separation_${this.styleId} {`;
+    for(let i = 0; i <= 20; i++) {
+      css += ` ${i * 5}% { text-shadow: ${Math.random() * this.separationDistance}px 0 ${this.separationBlur}px rgba(${rgb.toString()}, ${this.separationOpacity}), -${Math.random() * this.separationDistance}px 0 ${this.separationBlur}px rgba(${rgb.toString()}, ${this.separationOpacity * 0.5}), 0 0 3px; }`;
+    }
+    css += ' }';
+    return css;
+  }
+
+  public execute(): void {
+    $(`#${this.containerId}`).wrap($('<div />').attr('id', this.wrapperId));
+  }
+
+  public stop(): void {
+    $(`#${this.containerId}`).unwrap(`#${this.wrapperId}`);
+  }
+}
diff --git a/src/FilmGrain.ts b/src/FilmGrain.ts
index a1030f4..9cacafd 100644
--- a/src/FilmGrain.ts
+++ b/src/FilmGrain.ts
@@ -1,6 +1,7 @@
 // credit: https://codepen.io/zadvorsky/pen/PwyoMm
 
 import * as $ from 'jquery';
+import { IEffect } from './IEffect';
 
 export interface FilmGrainOptions {
   patternSize?: number;
@@ -10,7 +11,7 @@ export interface FilmGrainOptions {
   canvasId?: string;
 }
 
-export class FilmGrain {
+export class FilmGrain implements IEffect {
   private patternSize: number;
   private grainScaleX: number;
   private grainScaleY: number;
diff --git a/src/IEffect.ts b/src/IEffect.ts
new file mode 100644
index 0000000..aa81f92
--- /dev/null
+++ b/src/IEffect.ts
@@ -0,0 +1,4 @@
+export interface IEffect {
+  execute(): void;
+  stop(): void;
+}
diff --git a/src/Util.ts b/src/Util.ts
new file mode 100644
index 0000000..185463d
--- /dev/null
+++ b/src/Util.ts
@@ -0,0 +1,24 @@
+export class rgbColor {
+  public r: number = 0;
+  public g: number = 0;
+  public b: number = 0;
+
+  constructor(hex: string) {
+    const regex: RegExp = hex.length > 4
+      ? /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i
+      : /^#?([a-f\d])([a-f\d])([a-f\d])$/i;
+    const repeat = hex.length > 4 ? 1 : 2;
+
+    const result = regex.exec(hex);
+
+    if (result) {
+      this.r = parseInt(result[1].repeat(repeat), 16);
+      this.g = parseInt(result[2].repeat(repeat), 16);
+      this.b = parseInt(result[3].repeat(repeat), 16);
+    }
+  }
+
+  public toString(): string {
+    return `${this.r}, ${this.g}, ${this.b}`;
+  }
+}
diff --git a/src/main.ts b/src/main.ts
index 5a93d83..4be398d 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -1,3 +1,4 @@
 module.exports = {
+  CRT: require('./CRT.js').CRT,
   FilmGrain: require('./FilmGrain.js').FilmGrain,
 }