refactor: move world elements into dedicated module

Signed-off-by: André Jaenisch <andre.jaenisch@posteo.de>

src/js/world.js

@@ -0,0 +1,61 @@
+import { RigidShape } from './shape.js'
+import { Vec2 } from './vector.js'
+
+/** @typedef {import('./shape').Shape} Shape */
+
+/**
+ * Creates player avatar.
+ *
+ * @returns {Shape}
+ */
+export function makeAstronaut () {
+  const center = Vec2(200, 200)
+  const friction = 20
+  const restitution = 0
+  const mass = 400
+  const bounds = 1
+  const width = 20
+  const height = 20
+
+  const shape = RigidShape({
+    center,
+    mass,
+    friction,
+    restitution,
+    bounds,
+    width,
+    height
+  })
+
+  return shape
+}
+
+/**
+ * Creates a boundary at the bottom of the screen.
+ *
+ * @param {object} config
+ * @param {number} config.x
+ * @param {number} config.y
+ * @param {number} config.height
+ * @param {number} config.width
+ * @returns {Shape}
+ */
+export function makeBottomBoundary ({ x, y, height, width }) {
+  const center = Vec2(x + width / 2, y + height / 2)
+  const friction = 20
+  const restitution = 0
+  const mass = 0
+  const bounds = 1
+
+  const shape = RigidShape({
+    center,
+    mass,
+    friction,
+    restitution,
+    bounds,
+    width,
+    height
+  })
+
+  return shape
+}

test/js/world.test.js

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+import { expect } from 'chai'
+
+import { Vec2 } from '../../src/js/vector.js'
+import { makeAstronaut, makeBottomBoundary } from '../../src/js/world.js'
+
+describe('World', function () {
+  describe('makeAstronaut', function () {
+    it('should make an astronaut shape', function () {
+      // Arrange
+      /* nothing to do here */
+
+      // Act
+      const astronaut = makeAstronaut()
+
+      // Assert
+      expect(astronaut).to.be.an('object')
+    })
+  })
+
+  describe('makeBottomBoundary', function () {
+    it('should make an immobil shape', function () {
+      // Arrange
+      const x = 0
+      const y = 100
+      const height = 1
+      const width = 200
+
+      // Act
+      const boundary = makeBottomBoundary({ x, y, height, width })
+
+      // Assert
+      expect(boundary.X[0]).to.deep.equal(Vec2(x, y))
+      expect(boundary.X[2]).to.deep.equal(Vec2(x + width, y + height))
+    })
+  })
+})

types/world.d.ts

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+/** @typedef {import('./shape').Shape} Shape */
+/**
+ * Creates player avatar.
+ *
+ * @returns {Shape}
+ */
+export function makeAstronaut(): Shape;
+/**
+ * Creates a boundary at the bottom of the screen.
+ *
+ * @param {object} config
+ * @param {number} config.x
+ * @param {number} config.y
+ * @param {number} config.height
+ * @param {number} config.width
+ * @returns {Shape}
+ */
+export function makeBottomBoundary({ x, y, height, width }: {
+    x: number;
+    y: number;
+    height: number;
+    width: number;
+}): Shape;
+export type Shape = import('./shape').Shape;