From 16a6107b17c682047d04b53b025e7681ca273e32 Mon Sep 17 00:00:00 2001
From: Alexander Popov <iiiypuk@iiiypuk.me>
Date: Thu, 18 Nov 2021 01:21:29 +0300
Subject: [PATCH] add webpack & gameloop examples

---
 JavaScript/README.md   |   6 +++
 JavaScript/gameloop.js | 113 +++++++++++++++++++++++++++++++++++++++++
 JavaScript/webpack.md  |  33 ++++++++++++
 3 files changed, 152 insertions(+)
 create mode 100644 JavaScript/gameloop.js
 create mode 100644 JavaScript/webpack.md

diff --git a/JavaScript/README.md b/JavaScript/README.md
index 6a1fd02..f421637 100644
--- a/JavaScript/README.md
+++ b/JavaScript/README.md
@@ -1,6 +1,12 @@
 # JavaScript
 
+## Basic
+- [Webpack](webpack.md) example config
+
 ## Canvas
 - [Drawing text](drawing-text.js) - примеры рисования текста на CANVAS
 - [`measureText()`](measureText.js) - возвращает информацию об измеренном тексте, например ширину
 - [`drawImage()`](canvas.drawImage.js) - метод Canvas 2D API рисования изображения на холсте
+
+## GameDev
+- Canvas [GameLoop](gameloop.js) example
diff --git a/JavaScript/gameloop.js b/JavaScript/gameloop.js
new file mode 100644
index 0000000..a432145
--- /dev/null
+++ b/JavaScript/gameloop.js
@@ -0,0 +1,113 @@
+// Main variables
+let DEBUG = true;
+let canvas;
+let context;
+let cW;
+let cH;
+
+// FPS
+let secondsPassed;
+let oldTimeStamp;
+let fps;
+
+let dragging = false;
+
+function mMove(e) {
+  'use strict';
+
+  if (dragging) {
+    point.pX = e.offsetX * cW / canvas.clientWidth | 0;
+    point.pY = e.offsetY * cH / canvas.clientHeight | 0;
+  };
+}
+
+function mDown(e) {
+  'use strict';
+
+  dragging = true;
+}
+
+function mUp(e) {
+  'use strict';
+
+  dragging = false;
+}
+
+function clearContext() {
+  'use strict';
+
+  context.fillStyle = '#b27e56';
+  context.fillRect(0, 0, cW, cH);
+}
+
+// Init
+window.onload = function() {
+  'use strict';
+
+  canvas = document.getElementById('game');
+  context = canvas.getContext('2d');
+  cW = canvas.width;
+  cH = canvas.height;
+
+  canvas.style.height = window.innerHeight + "px";
+  if (DEBUG) {
+    console.log('Canvas set size to ' + window.innerHeight + 'px');
+    console.log(canvas.getBoundingClientRect());
+  };
+
+  canvas.addEventListener('mousedown', mDown, false);
+  canvas.addEventListener('mouseup', mUp, false);
+  canvas.addEventListener('mousemove', mMove, false);
+
+  canvas.addEventListener('touchstart', mDown, false);
+  canvas.addEventListener('touchend', mUp, false);
+  canvas.addEventListener('touchmove', mMove, false);
+
+  window.requestAnimationFrame(gameLoop);
+};
+
+window.addEventListener('resize', function() {
+  'use strict';
+
+  let canvas = document.getElementById('game');
+  canvas.style.height = window.innerHeight + "px";
+
+  if (DEBUG) {
+    console.log('Canvas resized to ' + window.innerHeight + 'px');
+    console.log(canvas.getBoundingClientRect());
+  };
+}, true);
+
+// GameLoop
+function gameLoop(timeStamp) {
+  'use strict';
+
+  // fps counter
+  secondsPassed = (timeStamp - oldTimeStamp) / 1000;
+  oldTimeStamp = timeStamp;
+  fps = Math.round(1 / secondsPassed);
+  // end fps counter
+
+  update();
+  draw();
+
+  if (DEBUG) {
+    context.font = '15px Arial';
+    context.fillStyle = '#101024';
+    context.fillText('FPS: ' + fps, 10, 20);
+  };
+
+  window.requestAnimationFrame(gameLoop);
+}
+
+function update() {
+  'use strict';
+
+  //
+}
+
+function draw() {
+  'use strict';
+
+  clearContext();
+}
diff --git a/JavaScript/webpack.md b/JavaScript/webpack.md
new file mode 100644
index 0000000..2dfe7a1
--- /dev/null
+++ b/JavaScript/webpack.md
@@ -0,0 +1,33 @@
+## WebPack
+`packages.json`
+```json
+"scripts": {
+    "serve": "webpack serve",
+    "html": "html-minifier --collapse-whitespace --remove-comments src/index.html --output dist/index.html",
+    "css": "csso src/styles.css --output dist/styles.css",
+    "build": "npm run html && npm run css && webpack --mode=production"
+},
+"devDependencies": {
+    "webpack": "^5.42.0",
+    "webpack-cli": "^4.7.2",
+    "webpack-dev-server": "^3.11.2"
+}
+```
+`webpack.config.js`
+```javascript
+const path = require('path');
+
+module.exports = {
+    mode: 'development',
+    entry: './src/index.js',
+    output: {
+        path: path.resolve(__dirname, 'dist'),
+        filename: 'engine.js',
+    },
+    devServer: {
+        contentBase: path.join(__dirname, 'src'),
+        compress: false,
+        port: 55555,
+    },
+};
+```