planck-js/src/__test__/Basic.test.ts

2D JavaScript/TypeScript physics engine for cross-platform HTML5 game development

import { describe, it, expect } from "vitest";

import { Vec2 } from "../common/Vec2";
import { CircleShape } from "../collision/shape/CircleShape";
import { World } from "../dynamics/World";

import "../collision/shape/CollideCircle";

describe("Basic", function(): void {

  it("World", function(): void {

    const world = new World();

    const circle = new CircleShape(1);

    const b1 = world.createBody({
      position : new Vec2(0, 0),
      type : "dynamic"
    });

    b1.createFixture(circle);

    expect(b1.getFixtureList().getType()).equal("circle");
    expect(b1.getWorld()).equal(world);
    expect(world.getBodyList()).equal(b1);

    b1.applyForceToCenter(new Vec2(1, 0), true);

    const b2 = world.createBody({
      position : new Vec2(2, 0),
      type : "dynamic"
    });
    b2.createFixture(circle);
    b2.applyForceToCenter(new Vec2(-1, 0), true);

    world.step(1 / 20);

    // console.log(b2.getPosition());

    const p = b1.getPosition();
    expect(p.x).closeTo(0.0, 1e-12);
    expect(p.y).closeTo(0.0, 1e-12);
  });

});