svg-pathdata/src/tests/quadraticbeziercurveto.test.ts

Manipulate SVG path data (path[d] attribute content) simply and efficiently.

import { describe, test, expect } from '@jest/globals';
import { SVGPathData } from '../index.js';
import type { CommandQ } from '../types.js';

describe('Parsing quadratic bezier curve to commands', () => {
  test('should not work when badly declared', () => {
    expect(() => new SVGPathData('Q')).toThrow(
      new SyntaxError('Unterminated command at the path end.'),
    );

    expect(() => new SVGPathData('Q10')).toThrow(
      new SyntaxError('Unterminated command at the path end.'),
    );

    expect(() => new SVGPathData('Q10 10')).toThrow(
      new SyntaxError('Unterminated command at the path end.'),
    );

    expect(() => new SVGPathData('Q10 10 10')).toThrow(
      new SyntaxError('Unterminated command at the path end.'),
    );

    expect(() => new SVGPathData('Q10 10 10 10 10 10')).toThrow(
      new SyntaxError('Unterminated command at the path end.'),
    );

    expect(() => new SVGPathData('Q10 10 10Q10 10 10 10')).toThrow(
      new SyntaxError('Unterminated command at index 9.'),
    );
  });

  test('should work with comma separated coordinates', () => {
    const commands = new SVGPathData('Q123,456 789,987').commands as CommandQ[];

    expect(commands[0].type).toEqual(SVGPathData.QUAD_TO);
    expect(commands[0].relative).toEqual(false);
    expect(commands[0].x1).toEqual(123);
    expect(commands[0].y1).toEqual(456);
    expect(commands[0].x).toEqual(789);
    expect(commands[0].y).toEqual(987);
  });

  test('should work with space separated coordinates', () => {
    const commands = new SVGPathData('Q123 456 789 987').commands as CommandQ[];

    expect(commands[0].type).toEqual(SVGPathData.QUAD_TO);
    expect(commands[0].relative).toEqual(false);
    expect(commands[0].x1).toEqual(123);
    expect(commands[0].y1).toEqual(456);
    expect(commands[0].x).toEqual(789);
    expect(commands[0].y).toEqual(987);
  });

  test('should work with nested separated complexer coordinate pairs', () => {
    const commands = new SVGPathData(
      'Q-10.0032e-5,-20.0032e-5 -30.0032e-5,-40.0032e-5',
    ).commands as CommandQ[];

    expect(commands[0].type).toEqual(SVGPathData.QUAD_TO);
    expect(commands[0].relative).toEqual(false);
    expect(commands[0].x1).toEqual(-10.0032e-5);
    expect(commands[0].y1).toEqual(-20.0032e-5);
    expect(commands[0].x).toEqual(-30.0032e-5);
    expect(commands[0].y).toEqual(-40.0032e-5);
  });

  test('should work with multiple pairs of coordinates', () => {
    const commands = new SVGPathData(`
      Q-10.0032e-5,-20.0032e-5 -30.0032e-5,-40.0032e-5
        -10.0032e-5,-20.0032e-5 -30.0032e-5,-40.0032e-5
        -10.0032e-5,-20.0032e-5 -30.0032e-5,-40.0032e-5
    `).commands as CommandQ[];

    expect(commands[0].type).toEqual(SVGPathData.QUAD_TO);
    expect(commands[0].relative).toEqual(false);
    expect(commands[0].x1).toEqual(-10.0032e-5);
    expect(commands[0].y1).toEqual(-20.0032e-5);
    expect(commands[0].x).toEqual(-30.0032e-5);
    expect(commands[0].y).toEqual(-40.0032e-5);
    expect(commands[1].type).toEqual(SVGPathData.QUAD_TO);
    expect(commands[1].relative).toEqual(false);
    expect(commands[1].x1).toEqual(-10.0032e-5);
    expect(commands[1].y1).toEqual(-20.0032e-5);
    expect(commands[1].x).toEqual(-30.0032e-5);
    expect(commands[1].y).toEqual(-40.0032e-5);
    expect(commands[2].type).toEqual(SVGPathData.QUAD_TO);
    expect(commands[2].relative).toEqual(false);
    expect(commands[2].x1).toEqual(-10.0032e-5);
    expect(commands[2].y1).toEqual(-20.0032e-5);
    expect(commands[2].x).toEqual(-30.0032e-5);
    expect(commands[2].y).toEqual(-40.0032e-5);
  });

  test('should work with multiple declared pairs of coordinates', () => {
    const commands = new SVGPathData(`
      Q-10.0032e-5,-20.0032e-5 -30.0032e-5,-40.0032e-5
        q-10.0032e-5,-20.0032e-5 -30.0032e-5,-40.0032e-5
      Q-10.0032e-5,-20.0032e-5 -30.0032e-5,-40.0032e-5
    `).commands as CommandQ[];

    expect(commands[0].type).toEqual(SVGPathData.QUAD_TO);
    expect(commands[0].relative).toEqual(false);
    expect(commands[0].x1).toEqual(-10.0032e-5);
    expect(commands[0].y1).toEqual(-20.0032e-5);
    expect(commands[0].x).toEqual(-30.0032e-5);
    expect(commands[0].y).toEqual(-40.0032e-5);
    expect(commands[1].type).toEqual(SVGPathData.QUAD_TO);
    expect(commands[1].relative).toEqual(true);
    expect(commands[1].x1).toEqual(-10.0032e-5);
    expect(commands[1].y1).toEqual(-20.0032e-5);
    expect(commands[1].x).toEqual(-30.0032e-5);
    expect(commands[1].y).toEqual(-40.0032e-5);
    expect(commands[2].type).toEqual(SVGPathData.QUAD_TO);
    expect(commands[2].relative).toEqual(false);
    expect(commands[2].x1).toEqual(-10.0032e-5);
    expect(commands[2].y1).toEqual(-20.0032e-5);
    expect(commands[2].x).toEqual(-30.0032e-5);
    expect(commands[2].y).toEqual(-40.0032e-5);
  });
});

describe('Encoding line to commands', () => {
  test('should work with one command', () => {
    expect(
      new SVGPathData(
        'Q-10.0032e-5 -20.0032e-5 -30.0032e-5 -40.0032e-5',
      ).encode(),
    ).toEqual('Q-0.000100032 -0.000200032 -0.000300032 -0.000400032');
  });

  test('should work with several commands', () => {
    expect(
      new SVGPathData(
        'Q-10.0032e-5 -20.0032e-5 -30.0032e-5 -40.0032e-5q-10.0032e-5 -20.0032e-5 -30.0032e-5 -40.0032e-5Q-10.0032e-5 -20.0032e-5 -30.0032e-5 -40.0032e-5',
      ).encode(),
    ).toEqual(
      'Q-0.000100032 -0.000200032 -0.000300032 -0.000400032q-0.000100032 -0.000200032 -0.000300032 -0.000400032Q-0.000100032 -0.000200032 -0.000300032 -0.000400032',
    );
  });
});