test/specs/helpers.segment.tests.js - master - githubmirror/Chart.js

test/specs/helpers.segment.tests.js
61 строка3 KB
Jukka Kurkela
Fix line segments with alignToPixel (#9042)
07 май 2021, 04:06
07 май 2021, 04:06137b51d
const {_boundSegment} = Chart.helpers;

describe('helpers.segments', function() {
  describe('_boundSegment', function() {
    const points = [{x: 10, y: 1}, {x: 20, y: 2}, {x: 30, y: 3}];
    const segment = {start: 0, end: 2, loop: false};

    it('should not find segment from before the line', function() {
      expect(_boundSegment(segment, points, {property: 'x', start: 5, end: 9.99999})).toEqual([]);
    });

    it('should not find segment from after the line', function() {
      expect(_boundSegment(segment, points, {property: 'x', start: 30.00001, end: 800})).toEqual([]);
    });

    it('should find segment when starting before line', function() {
      expect(_boundSegment(segment, points, {property: 'x', start: 5, end: 15})).toEqual([{start: 0, end: 1, loop: false, style: undefined}]);
    });

    it('should find segment directly on point', function() {
      expect(_boundSegment(segment, points, {property: 'x', start: 10, end: 10})).toEqual([{start: 0, end: 0, loop: false, style: undefined}]);
    });

    it('should find segment from range between points', function() {
      expect(_boundSegment(segment, points, {property: 'x', start: 11, end: 14})).toEqual([{start: 0, end: 1, loop: false, style: undefined}]);
    });

    it('should find segment from point between points', function() {
      expect(_boundSegment(segment, points, {property: 'x', start: 22, end: 22})).toEqual([{start: 1, end: 2, loop: false, style: undefined}]);
    });

    it('should find whole segment', function() {
      expect(_boundSegment(segment, points, {property: 'x', start: 0, end: 50})).toEqual([{start: 0, end: 2, loop: false, style: undefined}]);
    });

    it('should find correct segment from near points', function() {
      expect(_boundSegment(segment, points, {property: 'x', start: 10.001, end: 29.999})).toEqual([{start: 0, end: 2, loop: false, style: undefined}]);
    });

    it('should find segment from after the line', function() {
      expect(_boundSegment(segment, points, {property: 'x', start: 25, end: 35})).toEqual([{start: 1, end: 2, loop: false, style: undefined}]);
    });

    it('should find multiple segments', function() {
      const points2 = [{x: 0, y: 100}, {x: 1, y: 50}, {x: 2, y: 70}, {x: 4, y: 80}, {x: 5, y: -100}];
      expect(_boundSegment({start: 0, end: 4, loop: false}, points2, {property: 'y', start: 60, end: 60})).toEqual([
        {start: 0, end: 1, loop: false, style: undefined},
        {start: 1, end: 2, loop: false, style: undefined},
        {start: 3, end: 4, loop: false, style: undefined},
      ]);
    });

    it('should find correct segments when there are multiple points with same property value', function() {
      const repeatedPoints = [{x: 1, y: 5}, {x: 1, y: 6}, {x: 2, y: 5}, {x: 2, y: 6}, {x: 3, y: 5}, {x: 3, y: 6}, {x: 3, y: 7}];
      expect(_boundSegment({start: 0, end: 6, loop: false}, repeatedPoints, {property: 'x', start: 1, end: 1.1})).toEqual([{start: 0, end: 2, loop: false, style: undefined}]);
      expect(_boundSegment({start: 0, end: 6, loop: false}, repeatedPoints, {property: 'x', start: 2, end: 2.1})).toEqual([{start: 2, end: 4, loop: false, style: undefined}]);
      expect(_boundSegment({start: 0, end: 6, loop: false}, repeatedPoints, {property: 'x', start: 2, end: 3.1})).toEqual([{start: 2, end: 6, loop: false, style: undefined}]);
      expect(_boundSegment({start: 0, end: 6, loop: false}, repeatedPoints, {property: 'x', start: 0, end: 8})).toEqual([{start: 0, end: 6, loop: false, style: undefined}]);
    });
  });
});