initialized basic architecture and trigonometry

rasmusmerzin · Apr 17, 2020 · b1b8b88 · b1b8b88
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diff --git a/.gitignore b/.gitignore
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+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# production
+/build
+
+# misc
+.DS_Store
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
diff --git a/README.md b/README.md
@@ -0,0 +1,7 @@
+# Ants
+
+Ants is a simple web application rendering dots which move avoiding the cursor and each other.
+
+This project was created with [TypeScript](https://www.typescriptlang.org) [React](https://reactjs.org).
+
+Trigonometric functions have tests created using [Jest](https://jestjs.io).
diff --git a/package.json b/package.json
@@ -0,0 +1,39 @@
+{
+  "name": "ants",
+  "version": "0.1.0",
+  "private": true,
+  "dependencies": {
+    "@testing-library/jest-dom": "^4.2.4",
+    "@testing-library/react": "^9.3.2",
+    "@testing-library/user-event": "^7.1.2",
+    "@types/jest": "^24.0.0",
+    "@types/node": "^12.0.0",
+    "@types/react": "^16.9.0",
+    "@types/react-dom": "^16.9.0",
+    "react": "^16.13.1",
+    "react-dom": "^16.13.1",
+    "react-scripts": "3.4.1",
+    "typescript": "~3.7.2"
+  },
+  "scripts": {
+    "start": "react-scripts start",
+    "build": "react-scripts build",
+    "test": "react-scripts test",
+    "eject": "react-scripts eject"
+  },
+  "eslintConfig": {
+    "extends": "react-app"
+  },
+  "browserslist": {
+    "production": [
+      ">0.2%",
+      "not dead",
+      "not op_mini all"
+    ],
+    "development": [
+      "last 1 chrome version",
+      "last 1 firefox version",
+      "last 1 safari version"
+    ]
+  }
+}
diff --git a/public/favicon.ico b/public/favicon.ico
diff --git a/public/index.html b/public/index.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <meta name="theme-color" content="#000000" />
+    <meta
+      name="description"
+      content="Web site created using create-react-app"
+    />
+    <link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png" />
+    <!--
+      manifest.json provides metadata used when your web app is installed on a
+      user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
+    -->
+    <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
+    <!--
+      Notice the use of %PUBLIC_URL% in the tags above.
+      It will be replaced with the URL of the `public` folder during the build.
+      Only files inside the `public` folder can be referenced from the HTML.
+
+      Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
+      work correctly both with client-side routing and a non-root public URL.
+      Learn how to configure a non-root public URL by running `npm run build`.
+    -->
+    <title>React App</title>
+  </head>
+  <body>
+    <noscript>You need to enable JavaScript to run this app.</noscript>
+    <div id="root"></div>
+    <!--
+      This HTML file is a template.
+      If you open it directly in the browser, you will see an empty page.
+
+      You can add webfonts, meta tags, or analytics to this file.
+      The build step will place the bundled scripts into the <body> tag.
+
+      To begin the development, run `npm start` or `yarn start`.
+      To create a production bundle, use `npm run build` or `yarn build`.
+    -->
+  </body>
+</html>
diff --git a/public/logo192.png b/public/logo192.png
diff --git a/public/logo512.png b/public/logo512.png
diff --git a/public/manifest.json b/public/manifest.json
@@ -0,0 +1,25 @@
+{
+  "short_name": "React App",
+  "name": "Create React App Sample",
+  "icons": [
+    {
+      "src": "favicon.ico",
+      "sizes": "64x64 32x32 24x24 16x16",
+      "type": "image/x-icon"
+    },
+    {
+      "src": "logo192.png",
+      "type": "image/png",
+      "sizes": "192x192"
+    },
+    {
+      "src": "logo512.png",
+      "type": "image/png",
+      "sizes": "512x512"
+    }
+  ],
+  "start_url": ".",
+  "display": "standalone",
+  "theme_color": "#000000",
+  "background_color": "#ffffff"
+}
diff --git a/public/robots.txt b/public/robots.txt
@@ -0,0 +1,3 @@
+# https://www.robotstxt.org/robotstxt.html
+User-agent: *
+Disallow:
diff --git a/src/App.css b/src/App.css
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+body { cursor: pointer; }
+
+#app {
+  position: fixed;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+  background: #1c1c1c;
+  color: #fff;
+}
diff --git a/src/App.tsx b/src/App.tsx
@@ -0,0 +1,69 @@
+import React from 'react';
+import Dot from './Dot';
+import Trig from './Trig';
+import './App.css';
+
+
+const RENDER_RATE = 60;
+const PEEP_AGILITY = Trig.degToRad(30);
+const PEEP_SPEED = 5;
+
+
+interface Peep {
+  posX: number;
+  posY: number;
+  velX: number;
+  velY: number;
+}
+
+const App: React.FC = () => {
+  const [peeps, setPeeps] = React.useState<Peep[]>([
+    {
+      posX: 200,
+      posY: 200,
+      velX: 1,
+      velY: 0
+    }
+  ]);
+
+  const updatePeepDirections = () => setPeeps(peeps => {
+    peeps = peeps.map(node => {
+      let angle = Trig.getVelAngle(node.velX, node.velY);
+      angle += (Math.random() -.5) *PEEP_AGILITY;
+      [node.velX, node.velY] = Trig.getVelVector(angle, PEEP_SPEED);
+      return node;
+    });
+    return peeps;
+  });
+
+  const updatePeepPositions = () => setPeeps(peeps => {
+    peeps = peeps.map(node => {
+      node.posX += window.innerWidth +node.velX;
+      node.posY += window.innerHeight +node.velY;
+      node.posX %= window.innerWidth;
+      node.posY %= window.innerHeight;
+      return node;
+    });
+    return peeps;
+  });
+
+  React.useEffect(() => {
+    const ticker = setInterval(() => {
+      updatePeepDirections();
+      updatePeepPositions();
+    }, 1000 /RENDER_RATE);
+    return () => clearInterval(ticker);
+  }, []);
+
+  return <div
+    id='app'
+  >
+    {peeps.map((node, i) => <Dot
+      key={i}
+      posX={node.posX}
+      posY={node.posY}
+    />)}
+  </div>;
+};
+
+export default App;
diff --git a/src/Dot.css b/src/Dot.css
@@ -0,0 +1,7 @@
+.peep {
+  position: absolute;
+  background: #fff;
+  width: 10px;
+  height: 10px;
+  border-radius: 5px;
+}
diff --git a/src/Dot.tsx b/src/Dot.tsx
@@ -0,0 +1,19 @@
+import React from 'react';
+import './Dot.css';
+
+interface Props {
+  posX: number;
+  posY: number;
+}
+
+const Dot: React.FC<Props> = ({ posX, posY }) => {
+  return <div
+    className='peep'
+    style={{
+      left: posX +'px',
+      top: posY +'px'
+    }}
+  ></div>;
+};
+
+export default Dot;
diff --git a/src/Trig.test.ts b/src/Trig.test.ts
@@ -0,0 +1,30 @@
+import Trig from './Trig';
+
+test(
+  'fullTurn is 360°',
+  () => expect(Trig.radToDeg(Trig.fullTurn)).toBe(360)
+);
+
+test(
+  'Angle 0 corresponds to O-vector',
+  () => expect(Trig.getVelVector(0)).toEqual([0, 0])
+);
+
+test(
+  'O-vector angle is 0',
+  () => expect(Trig.getVelAngle(0, 0)).toBe(0)
+);
+
+[0, 45, 90, 135, 180, 225, 270, 315, 360].forEach(angle =>
+  test(`angle ${angle}° consistency`, () => {
+    const [posX, posY] = Trig.getVelVector(Trig.degToRad(angle));
+    expect(Math.round(Trig.radToDeg(Trig.getVelAngle(posX, posY))))
+      .toBe(angle %360);
+  }));
+
+[[3, 4, 5], [5, 12, 13], [8, 15, 17], [7, 24, 25]].forEach(triple =>
+  test(
+    `Pythagorean triple (${triple.join(', ')})`,
+    () => expect(Trig.getVelMagnitude(triple[0], triple[1]))
+      .toBe(triple[2])
+  ));
diff --git a/src/Trig.ts b/src/Trig.ts
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+const fullTurn = Math.PI *2;
+
+const getVelAngle = (velX: number, velY: number): number =>
+  velX === 0 && velY === 0
+    ? 0
+    : (fullTurn +Math.atan(velY /velX) +(velX < 0 ? Math.PI : 0)) %fullTurn;
+
+const getVelVector = (angle: number, length = 1): [number, number] =>
+  angle === 0
+    ? [0, 0]
+    : [Math.cos(angle) *length, Math.sin(angle) *length];
+
+const getVelMagnitude = (velX: number, velY: number): number =>
+  (velX **2 +velY **2) **.5;
+
+const radToDeg = (rad: number): number => rad /Math.PI *180;
+const degToRad = (deg: number): number => deg *Math.PI /180;
+
+export default {
+  getVelAngle,
+  getVelVector,
+  getVelMagnitude,
+  radToDeg,
+  degToRad,
+
+  fullTurn
+};
diff --git a/src/index.tsx b/src/index.tsx
@@ -0,0 +1,5 @@
+import React from 'react';
+import ReactDOM from 'react-dom';
+import App from './App';
+
+ReactDOM.render(<App />, document.getElementById('root'));
diff --git a/src/react-app-env.d.ts b/src/react-app-env.d.ts
@@ -0,0 +1 @@
+/// <reference types="react-scripts" />
diff --git a/tsconfig.json b/tsconfig.json
@@ -0,0 +1,25 @@
+{
+  "compilerOptions": {
+    "target": "es5",
+    "lib": [
+      "dom",
+      "dom.iterable",
+      "esnext"
+    ],
+    "allowJs": true,
+    "skipLibCheck": true,
+    "esModuleInterop": true,
+    "allowSyntheticDefaultImports": true,
+    "strict": true,
+    "forceConsistentCasingInFileNames": true,
+    "module": "esnext",
+    "moduleResolution": "node",
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "noEmit": true,
+    "jsx": "react"
+  },
+  "include": [
+    "src"
+  ]
+}