yes

.gitignore

@@ -21,3 +21,6 @@
 npm-debug.log*
 yarn-debug.log*
 yarn-error.log*
+
+*.iml
+.idea

.idea/misc.xml

@@ -1,4 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="ProjectRootManager" version="2" project-jdk-name="Haskell Tool Stack" project-jdk-type="Haskell Tool Stack SDK" />
-</project>

src/App.test.tsx

@@ -1,9 +0,0 @@
-import React from 'react';
-import { render, screen } from '@testing-library/react';
-import App from './App';
-
-test('renders learn react link', () => {
-  render(<App />);
-  const linkElement = screen.getByText(/learn react/i);
-  expect(linkElement).toBeInTheDocument();
-});

src/App.tsx

@@ -1,26 +1,33 @@
-import React from 'react';
+import React, {useEffect, useRef} from 'react';
-import logo from './logo.svg';
+import {draw, init, update} from "./draw/MainDraw";
-import './App.css';
+
+let CANVAS_WIDTH = 1500;
+let CANVAS_HEIGHT = 700;
 
 function App() {
-  return (
+    const canvasRef = useRef<HTMLCanvasElement>(null);
-    <div className="App">
+
-      <header className="App-header">
+    useEffect(() => {
-        <img src={logo} className="App-logo" alt="logo" />
+        const canvas = canvasRef.current;
-        <p>
+        if (!canvas) {
-          Edit <code>src/App.tsx</code> and save to reload.
+            return;
-        </p>
+        }
-        <a
+        const context = canvasRef.current!.getContext("2d")!;
-          className="App-link"
+        init();
-          href="https://reactjs.org"
+        const interval = setInterval(() => {
-          target="_blank"
+            update();
-          rel="noopener noreferrer"
+        }, 1000 / 30);
-        >
+        draw(context);
-          Learn React
+        return () => clearInterval(interval);
-        </a>
+    }, [canvasRef]);
-      </header>
+
-    </div>
+    return (
-  );
+        <div>
+            <h1>Redox</h1>
+            <canvas ref={canvasRef} height={CANVAS_HEIGHT} width={CANVAS_WIDTH}/>
+        </div>
+    );
 }
 
+export {CANVAS_WIDTH, CANVAS_HEIGHT};
 export default App;

src/draw/MainDraw.ts

@@ -0,0 +1,23 @@
+import {rect} from "./Shapes";
+import {updateParticles, particlesInit, drawParticles} from "./Particles";
+import {CANVAS_HEIGHT, CANVAS_WIDTH} from "../App";
+
+type FillStyle = string | CanvasGradient | CanvasPattern;
+type Ctx = CanvasRenderingContext2D;
+
+function init() {
+    particlesInit();
+}
+
+function draw(ctx: Ctx) {
+    rect(ctx, 0, 0, CANVAS_WIDTH, CANVAS_HEIGHT, "lightgrey");
+    drawParticles(ctx);
+    requestAnimationFrame(() => draw(ctx));
+}
+
+function update() {
+    updateParticles();
+}
+
+export type {Ctx, FillStyle};
+export {update, init, draw};

src/draw/Particles.ts

@@ -0,0 +1,49 @@
+import {Ctx} from "./MainDraw";
+import Particle from "./classes/Particle";
+import Vector from "./classes/Vector";
+import {CANVAS_HEIGHT, CANVAS_WIDTH} from "../App";
+
+const particles: Particle[] = [];
+
+
+export function particlesInit() {
+    for (let i = 0; i < 200; i++) {
+        particles.push(new Particle(new Vector(
+            Math.random() * (CANVAS_WIDTH - 100) + 50,
+            Math.random() * (CANVAS_HEIGHT - 100) + 50
+        ), Math.random() < 0.3 ? 0 : Math.random() < 0.6 ? -1 : 1));
+    }
+}
+
+export function drawParticles(ctx: Ctx) {
+    particles.forEach(p => p.draw(ctx));
+}
+
+export function updateParticles() {
+    calculateChargedForces();
+    particles.forEach(p => p.update());
+}
+
+function calculateChargedForces() {
+    for (let i = 0; i < particles.length; i++) {
+        const particle = particles[i];
+        if (particle.charge !== 0) {
+            for (let j = i + 1; j < particles.length; j++) {
+                const innerParticle = particles[j];
+                if (innerParticle.charge !== 0) {
+                    const dist = particle.position.distance(innerParticle.position);
+                    if (dist < 1000 && dist > 0.30) {
+                        const f1 = innerParticle.position.sub(particle.position).scale(0.5 / dist ** 2);
+                        if (particle.charge === innerParticle.charge) {
+                            particle.applyForce(f1.negated());
+                            innerParticle.applyForce(f1);
+                        } else {
+                            particle.applyForce(f1);
+                            innerParticle.applyForce(f1.negated());
+                        }
+                    }
+                }
+            }
+        }
+    }
+}

src/draw/Shapes.ts

@@ -0,0 +1,14 @@
+import {Ctx, FillStyle} from "./MainDraw";
+
+
+export function rect(ctx: Ctx, x: number, y: number, w: number, h: number, color: FillStyle = "black"): void {
+    ctx.fillStyle = color;
+    ctx.fillRect(x, y, w, h);
+}
+
+export function circle(ctx: Ctx, x: number, y: number, r: number, color: FillStyle = "black"): void {
+    ctx.fillStyle = color;
+    ctx.beginPath();
+    ctx.ellipse(x, y, r, r, 0, 0, 50);
+    ctx.fill();
+}

src/draw/classes/Drawable.ts

@@ -0,0 +1,7 @@
+import {Ctx} from "../MainDraw";
+
+export default interface SimObject {
+    draw(ctx: Ctx): void;
+
+    update(): void;
+}

src/draw/classes/Particle.ts

@@ -0,0 +1,73 @@
+import Vector from "./Vector";
+import SimObject from "./Drawable";
+import {Ctx, FillStyle} from "../MainDraw";
+import {circle} from "../Shapes";
+import {CANVAS_HEIGHT, CANVAS_WIDTH} from "../../App";
+
+const PARTICLE_SIZE = 5;
+const PARTICLE_EDGE_REPULSION_FORCE = 0.1;
+const FRICTION = 0.99;
+const RANDOM_ACCELERATION = 2;
+
+export default class Particle implements SimObject {
+    private _position: Vector;
+    private _velocity: Vector;
+    // private _color: FillStyle;
+    private _charge: number;
+
+    constructor(position: Vector, /*color = "black", */charge = 0) {
+        this._position = position;
+        this._velocity = new Vector();
+        //this._color = color;
+        this._charge = charge;
+    }
+
+    public applyForce(force: Vector) {
+        this._velocity = this._velocity.add(force);
+    }
+
+    public draw(ctx: Ctx): void {
+        circle(ctx, this._position.x, this._position.y, PARTICLE_SIZE, colorFromCharge(this._charge));
+    }
+
+    public update(): void {
+        this._position = this._position.add(this._velocity);
+        this._velocity = this._velocity.scale(FRICTION);
+
+        // random movement
+        if (this._velocity.magnitude() < 0.1 && Math.random() > 0.4) {
+            this.applyForce(new Vector((Math.random() - 0.5) * RANDOM_ACCELERATION, (Math.random() - 0.5) * RANDOM_ACCELERATION));
+        }
+
+        if (this._position.x < 50) {
+            this.applyForce(new Vector(PARTICLE_EDGE_REPULSION_FORCE, 0));
+        }
+        if (this._position.x > CANVAS_WIDTH - 50) {
+            this.applyForce(new Vector(-PARTICLE_EDGE_REPULSION_FORCE, 0));
+        }
+        if (this._position.y > CANVAS_HEIGHT - 50) {
+            this.applyForce(new Vector(0, -PARTICLE_EDGE_REPULSION_FORCE));
+        }
+        if (this._position.y < 50) {
+            this.applyForce(new Vector(0, PARTICLE_EDGE_REPULSION_FORCE));
+        }
+    }
+
+    public get charge() {
+        return this._charge;
+    }
+
+    public get position() {
+        return this._position;
+    }
+}
+
+function colorFromCharge(charge: number): FillStyle {
+    if (charge === 0) {
+        return "black";
+    }
+    if (charge < 0) {
+        return "blue";
+    }
+    return "red";
+}

src/draw/classes/Vector.ts

@@ -0,0 +1,38 @@
+export default class Vector {
+    public x: number;
+    public y: number;
+
+    constructor(x: number = 0, y: number = 0) {
+        this.x = x;
+        this.y = y;
+    }
+
+    public add(b: Vector): Vector {
+        return new Vector(this.x + b.x, this.y + b.y);
+    }
+
+    public sub(b: Vector) {
+        return new Vector(this.x - b.x, this.y - b.y);
+    }
+
+    public scale(number: number) {
+        return new Vector(this.x * number, this.y * number);
+    }
+
+    public magnitude() {
+        return Math.sqrt(this.x * this.x + this.y * this.y);
+    }
+
+    public distance(b: Vector) {
+        return Math.sqrt((this.x - b.x) ** 2 + (this.y - b.y) ** 2)
+    }
+
+    public negated() {
+        return new Vector(-this.x, -this.y);
+    }
+
+    public normalized() {
+        const factor = this.magnitude();
+        return new Vector(this.x / factor, this.y / factor);
+    }
+}

src/index.css

@@ -1,13 +0,0 @@
-body {
-  margin: 0;
-  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
-    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
-    sans-serif;
-  -webkit-font-smoothing: antialiased;
-  -moz-osx-font-smoothing: grayscale;
-}
-
-code {
-  font-family: source-code-pro, Menlo, Monaco, Consolas, 'Courier New',
-    monospace;
-}

src/index.tsx

@@ -1,17 +1,10 @@
 import React from 'react';
 import ReactDOM from 'react-dom';
-import './index.css';
 import App from './App';
-import reportWebVitals from './reportWebVitals';
 
 ReactDOM.render(
   <React.StrictMode>
     <App />
   </React.StrictMode>,
   document.getElementById('root')
-);
+);
-
-// If you want to start measuring performance in your app, pass a function
-// to log results (for example: reportWebVitals(console.log))
-// or send to an analytics endpoint. Learn more: https://bit.ly/CRA-vitals
-reportWebVitals();

src/logo.svg

@@ -1 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 841.9 595.3"><g fill="#61DAFB"><path d="M666.3 296.5c0-32.5-40.7-63.3-103.1-82.4 14.4-63.6 8-114.2-20.2-130.4-6.5-3.8-14.1-5.6-22.4-5.6v22.3c4.6 0 8.3.9 11.4 2.6 13.6 7.8 19.5 37.5 14.9 75.7-1.1 9.4-2.9 19.3-5.1 29.4-19.6-4.8-41-8.5-63.5-10.9-13.5-18.5-27.5-35.3-41.6-50 32.6-30.3 63.2-46.9 84-46.9V78c-27.5 0-63.5 19.6-99.9 53.6-36.4-33.8-72.4-53.2-99.9-53.2v22.3c20.7 0 51.4 16.5 84 46.6-14 14.7-28 31.4-41.3 49.9-22.6 2.4-44 6.1-63.6 11-2.3-10-4-19.7-5.2-29-4.7-38.2 1.1-67.9 14.6-75.8 3-1.8 6.9-2.6 11.5-2.6V78.5c-8.4 0-16 1.8-22.6 5.6-28.1 16.2-34.4 66.7-19.9 130.1-62.2 19.2-102.7 49.9-102.7 82.3 0 32.5 40.7 63.3 103.1 82.4-14.4 63.6-8 114.2 20.2 130.4 6.5 3.8 14.1 5.6 22.5 5.6 27.5 0 63.5-19.6 99.9-53.6 36.4 33.8 72.4 53.2 99.9 53.2 8.4 0 16-1.8 22.6-5.6 28.1-16.2 34.4-66.7 19.9-130.1 62-19.1 102.5-49.9 102.5-82.3zm-130.2-66.7c-3.7 12.9-8.3 26.2-13.5 39.5-4.1-8-8.4-16-13.1-24-4.6-8-9.5-15.8-14.4-23.4 14.2 2.1 27.9 4.7 41 7.9zm-45.8 106.5c-7.8 13.5-15.8 26.3-24.1 38.2-14.9 1.3-30 2-45.2 2-15.1 0-30.2-.7-45-1.9-8.3-11.9-16.4-24.6-24.2-38-7.6-13.1-14.5-26.4-20.8-39.8 6.2-13.4 13.2-26.8 20.7-39.9 7.8-13.5 15.8-26.3 24.1-38.2 14.9-1.3 30-2 45.2-2 15.1 0 30.2.7 45 1.9 8.3 11.9 16.4 24.6 24.2 38 7.6 13.1 14.5 26.4 20.8 39.8-6.3 13.4-13.2 26.8-20.7 39.9zm32.3-13c5.4 13.4 10 26.8 13.8 39.8-13.1 3.2-26.9 5.9-41.2 8 4.9-7.7 9.8-15.6 14.4-23.7 4.6-8 8.9-16.1 13-24.1zM421.2 430c-9.3-9.6-18.6-20.3-27.8-32 9 .4 18.2.7 27.5.7 9.4 0 18.7-.2 27.8-.7-9 11.7-18.3 22.4-27.5 32zm-74.4-58.9c-14.2-2.1-27.9-4.7-41-7.9 3.7-12.9 8.3-26.2 13.5-39.5 4.1 8 8.4 16 13.1 24 4.7 8 9.5 15.8 14.4 23.4zM420.7 163c9.3 9.6 18.6 20.3 27.8 32-9-.4-18.2-.7-27.5-.7-9.4 0-18.7.2-27.8.7 9-11.7 18.3-22.4 27.5-32zm-74 58.9c-4.9 7.7-9.8 15.6-14.4 23.7-4.6 8-8.9 16-13 24-5.4-13.4-10-26.8-13.8-39.8 13.1-3.1 26.9-5.8 41.2-7.9zm-90.5 125.2c-35.4-15.1-58.3-34.9-58.3-50.6 0-15.7 22.9-35.6 58.3-50.6 8.6-3.7 18-7 27.7-10.1 5.7 19.6 13.2 40 22.5 60.9-9.2 20.8-16.6 41.1-22.2 60.6-9.9-3.1-19.3-6.5-28-10.2zM310 490c-13.6-7.8-19.5-37.5-14.9-75.7 1.1-9.4 2.9-19.3 5.1-29.4 19.6 4.8 41 8.5 63.5 10.9 13.5 18.5 27.5 35.3 41.6 50-32.6 30.3-63.2 46.9-84 46.9-4.5-.1-8.3-1-11.3-2.7zm237.2-76.2c4.7 38.2-1.1 67.9-14.6 75.8-3 1.8-6.9 2.6-11.5 2.6-20.7 0-51.4-16.5-84-46.6 14-14.7 28-31.4 41.3-49.9 22.6-2.4 44-6.1 63.6-11 2.3 10.1 4.1 19.8 5.2 29.1zm38.5-66.7c-8.6 3.7-18 7-27.7 10.1-5.7-19.6-13.2-40-22.5-60.9 9.2-20.8 16.6-41.1 22.2-60.6 9.9 3.1 19.3 6.5 28.1 10.2 35.4 15.1 58.3 34.9 58.3 50.6-.1 15.7-23 35.6-58.4 50.6zM320.8 78.4z"/><circle cx="420.9" cy="296.5" r="45.7"/><path d="M520.5 78.1z"/></g></svg>

src/reportWebVitals.ts

@@ -1,15 +0,0 @@
-import { ReportHandler } from 'web-vitals';
-
-const reportWebVitals = (onPerfEntry?: ReportHandler) => {
-  if (onPerfEntry && onPerfEntry instanceof Function) {
-    import('web-vitals').then(({ getCLS, getFID, getFCP, getLCP, getTTFB }) => {
-      getCLS(onPerfEntry);
-      getFID(onPerfEntry);
-      getFCP(onPerfEntry);
-      getLCP(onPerfEntry);
-      getTTFB(onPerfEntry);
-    });
-  }
-};
-
-export default reportWebVitals;

src/setupTests.ts

@@ -1,5 +0,0 @@
-// jest-dom adds custom jest matchers for asserting on DOM nodes.
-// allows you to do things like:
-// expect(element).toHaveTextContent(/react/i)
-// learn more: https://github.com/testing-library/jest-dom
-import '@testing-library/jest-dom';