Add TypeScript, generate stations and a line

src/utils.ts

@@ -0,0 +1,16 @@
+import * as PIXI from 'pixi.js';
+
+export const randomInt = (min: number, max: number): number => (
+  // inclusive of min and max
+  Math.floor(Math.random() * (max - (min + 1))) + min
+);
+
+export const randomPoint = () => (
+  new PIXI.Point(randomInt(0, window.innerWidth), randomInt(0, window.innerHeight))
+);
+
+export const distance = (pointA: PIXI.Point, pointB: PIXI.Point): number => {
+  const distX = pointA.x - pointB.x;
+  const distY = pointA.y - pointB.y;
+  return Math.sqrt((distX * distX) + (distY * distY));
+};