d3-curve-circlecorners/src/index.spec.js

A curve function that can be passed to the d3.js line.curve and area.curve functions

const tape = require('tape');
const { line } = require('d3-shape');
const circleCorners = require('../dist/d3-curve-circlecorners');

tape('line.curve(circleCorners)(data) generates the expected path', (test) => {
  var l = line().curve(circleCorners);
  test.equal(l([]), null);
  test.equal(l([[0, 1]]), 'M0,1');
  test.equal(
    l([
      [0, 1],
      [1, 3],
    ]),
    'M0,1L1,3'
  );
  test.equal(
    l([
      [0, 1],
      [1, 3],
      [2, 1],
    ]),
    'M0,1L0.10557280900008392,1.2111456180001683A1,1,0,0,0,1.8944271909999157,1.2111456180001683L2,1'
  );
  test.equal(
    l([
      [0, 1],
      [1, 3],
      [2, 1],
      [3, 3],
    ]),
    'M0,1L0.10557280900008392,1.2111456180001683A1,1,0,0,0,1.8944271909999157,1.2111456180001683L1.8944271909999157,1.2111456180001683A0.11803398874989496,0.11803398874989496,0,0,1,2.1055728090000843,1.2111456180001683L3,3'
  );
  // test.equal(l(POINTS), RADIUS1_FIXTURE);
  test.end();
});

tape(
  'line.curve(circleCorners.radius(r))(data) allows radii to be specified, with a default of 1',
  (test) => {
    test.equal(
      line().curve(circleCorners.radius(1))([
        [0, 1],
        [1, 3],
        [2, 1],
        [3, 3],
      ]),
      line().curve(circleCorners)([
        [0, 1],
        [1, 3],
        [2, 1],
        [3, 3],
      ])
    );
    test.equal(
      line().curve(circleCorners.radius(20))([
        [50, 50],
        [200, 50],
        [100, 100],
        [100, 250],
        [400, 100],
      ]),
      'M50,50L115.2786404500042,50A20,20,0,0,1,124.22291236000336,87.88854381999832L111.05572809000084,94.47213595499957A20,20,0,0,0,100,112.36067977499789L100,217.6393202250021A20,20,0,0,0,128.94427190999915,235.52786404500043L400,100'
    );
    test.equal(
      line().curve(circleCorners.radius(0.65))([
        [-2, 1.15],
        [-3.15, 1.15],
        [-3.15, -1],
      ]),
      'M-2,1.15L-2.5,1.15A0.65,0.65,0,0,1,-3.15,0.4999999999999998L-3.15,-1'
    );
    test.equal(
      line().curve(circleCorners.radius(0.5))([
        [-3.15, -1],
        [-3.65, -1],
        [-3.65, -5.25],
        [-4.75, -6.35],
        [-7, -4],
        [-8, -4],
        [-8, -5],
      ]),
      'M-3.15,-1L-3.15,-1A0.49999999999999994,0.49999999999999994,0,0,1,-3.65,-1.5L-3.65,-5.042893218813452A0.5,0.5,0,0,0,-3.7964466094067264,-5.396446609406726L-4.388677133139332,-5.988677133139332A0.5,0.5,0,0,0,-5.1033845288317465,-5.980909492109065L-6.8523480580922405,-4.154214250436993A0.5,0.5,0,0,1,-7.21350206319138,-4L-7.5,-4A0.5,0.5,0,0,1,-8,-4.5L-8,-5'
    );
    test.end();
  }
);

tape('should not crash on overlapping segments', (test) => {
  var l = line().curve(circleCorners.radius(6));
  test.equal(
    l([
      [-1, -1],
      [-1, 0],
      [-1, -5],
    ]),
    'M-1,-1L-1,0A0,0,0,0,0,-1,0L-1,-5'
  );
  test.end();
});

// tape(
//   "line.curve(circleCorners)(data) should end the path into a closed shape",
//   test => {}
// );