freesewing/tests/utils.test.js

let expect = require("chai").expect;
let freesewing = require("./dist/index.js");
let utils = freesewing.utils;

it("Should return the correct macro name", () => {
  expect(utils.macroName("test")).to.equal("_macro_test");
});

it("Should find the intersection of two endless line segments", () => {
  let a = new freesewing.Point(10, 20);
  let b = new freesewing.Point(20, 24);
  let c = new freesewing.Point(90, 19);
  let d = new freesewing.Point(19, 70);
  let X = freesewing.utils.beamsCross(a, b, c, d);
  expect(X.x).to.equal(60.49);
  expect(X.y).to.equal(40.2);
});

it("Should detect parallel lines", () => {
  let a = new freesewing.Point(10, 20);
  let b = new freesewing.Point(20, 20);
  let c = new freesewing.Point(90, 40);
  let d = new freesewing.Point(19, 40);
  expect(freesewing.utils.beamsCross(a, b, c, d)).to.equal(false);
  expect(freesewing.utils.linesCross(a, b, c, d)).to.equal(false);
});

it("Should detect vertical lines", () => {
  let a = new freesewing.Point(10, 20);
  let b = new freesewing.Point(10, 90);
  let c = new freesewing.Point(90, 40);
  let d = new freesewing.Point(19, 40);
  let X = freesewing.utils.beamsCross(a, b, c, d);
  expect(X.x).to.equal(10);
  expect(X.y).to.equal(40);
  X = freesewing.utils.beamsCross(c, d, a, b);
  expect(X.x).to.equal(10);
});

it("Should swap direction prior to finding beam intersection", () => {
  let a = new freesewing.Point(10, 20);
  let b = new freesewing.Point(00, 90);
  let c = new freesewing.Point(90, 40);
  let d = new freesewing.Point(19, 40);
  let X = freesewing.utils.beamsCross(a, b, c, d);
  expect(X.x).to.equal(7.14);
  expect(X.y).to.equal(40);
});

it("Should return false when two lines don't intersect", () => {
  let a = new freesewing.Point(10, 20);
  let b = new freesewing.Point(20, 24);
  let c = new freesewing.Point(90, 19);
  let d = new freesewing.Point(19, 70);
  expect(freesewing.utils.linesCross(a, b, c, d)).to.equal(false);
});

it("Should find the intersection of two line segments", () => {
  let a = new freesewing.Point(10, 10);
  let b = new freesewing.Point(90, 74);
  let c = new freesewing.Point(90, 19);
  let d = new freesewing.Point(11, 70);
  let X = freesewing.utils.beamsCross(a, b, c, d);
  expect(X.x).to.equal(51.95);
  expect(X.y).to.equal(43.56);
});

it("Should find the intersection of an endles line and a give X-value", () => {
  let a = new freesewing.Point(10, 10);
  let b = new freesewing.Point(90, 74);
  let X = freesewing.utils.beamCrossesX(a, b, 69);
  expect(X.x).to.equal(69);
  expect(X.y).to.equal(57.2);
});

it("Should find the intersection of an endles line and a give Y-value", () => {
  let a = new freesewing.Point(10, 10);
  let b = new freesewing.Point(90, 74);
  let X = freesewing.utils.beamCrossesY(a, b, 69);
  expect(X.x).to.equal(83.75);
  expect(X.y).to.equal(69);
});

it("Should detect vertical lines never pass a give X-value", () => {
  let a = new freesewing.Point(10, 10);
  let b = new freesewing.Point(10, 90);
  expect(freesewing.utils.beamCrossesX(a, b, 69)).to.equal(false);
});

it("Should detect horizontal lines never pass a give Y-value", () => {
  let a = new freesewing.Point(10, 10);
  let b = new freesewing.Point(90, 10);
  expect(freesewing.utils.beamCrossesY(a, b, 69)).to.equal(false);
});

it("Should find no intersections between a curve and a line", () => {
  let A = new freesewing.Point(10, 10);
  let Acp = new freesewing.Point(310, 40);
  let B = new freesewing.Point(110, 70);
  let Bcp = new freesewing.Point(-210, 40);
  let E = new freesewing.Point(-20, -20);
  let D = new freesewing.Point(30, -85);

  let hit = freesewing.utils.curveCrossesLine(A, Acp, Bcp, B, E, D);
  expect(hit).to.equal(false);
});

it("Should find 1 intersection between a curve and a line", () => {
  let A = new freesewing.Point(10, 10);
  let Acp = new freesewing.Point(310, 40);
  let B = new freesewing.Point(110, 70);
  let Bcp = new freesewing.Point(-210, 40);
  let E = new freesewing.Point(20, 20);
  let D = new freesewing.Point(30, -85);

  let hit = freesewing.utils.curveCrossesLine(A, Acp, Bcp, B, E, D);
  expect(hit.x).to.equal(20.85);
  expect(hit.y).to.equal(11.11);
});

it("Should find 3 intersections between a curve and a line", () => {
  let A = new freesewing.Point(10, 10);
  let Acp = new freesewing.Point(310, 40);
  let B = new freesewing.Point(110, 70);
  let Bcp = new freesewing.Point(-210, 40);
  let E = new freesewing.Point(20, -5);
  let D = new freesewing.Point(100, 85);

  let hits = freesewing.utils.curveCrossesLine(A, Acp, Bcp, B, E, D);
  expect(hits.length).to.equal(3);
});

it("Should find 9 intersections between two curves", () => {
  let A = new freesewing.Point(10, 10);
  let Acp = new freesewing.Point(310, 40);
  let B = new freesewing.Point(110, 70);
  let Bcp = new freesewing.Point(-210, 40);
  let C = new freesewing.Point(20, -5);
  let Ccp = new freesewing.Point(60, 300);
  let D = new freesewing.Point(100, 85);
  let Dcp = new freesewing.Point(70, -220);

  let hits = freesewing.utils.curveCrossesCurve(A, Acp, Bcp, B, C, Ccp, Dcp, D);
  expect(hits.length).to.equal(9);
});

it("Should find 1 intersection between two curves", () => {
  let A = new freesewing.Point(10, 10);
  let Acp = new freesewing.Point(310, 40);
  let B = new freesewing.Point(110, 70);
  let Bcp = new freesewing.Point(-210, 40);
  let C = new freesewing.Point(20, -5);
  let Ccp = new freesewing.Point(-60, 300);
  let D = new freesewing.Point(-200, 85);
  let Dcp = new freesewing.Point(-270, -220);

  let hit = freesewing.utils.curveCrossesCurve(A, Acp, Bcp, B, C, Ccp, Dcp, D);
  expect(hit.x).to.equal(15.58);
  expect(hit.y).to.equal(10.56);
});

it("Should find no intersection between two curves", () => {
  let A = new freesewing.Point(10, 10);
  let Acp = new freesewing.Point(310, 40);
  let B = new freesewing.Point(110, 70);
  let Bcp = new freesewing.Point(-210, 40);
  let C = new freesewing.Point(20, -5);
  let Ccp = new freesewing.Point(-60, -300);
  let D = new freesewing.Point(-200, 85);
  let Dcp = new freesewing.Point(-270, -220);

  let hit = freesewing.utils.curveCrossesCurve(A, Acp, Bcp, B, C, Ccp, Dcp, D);
  expect(hit).to.equal(false);
});

it("Should correctly format units", () => {
  expect(freesewing.utils.units(123.456)).to.equal("12.35cm");
  expect(freesewing.utils.units(123.456, "imperial")).to.equal('4.86"');
});