lib/web_ui/test/path_test.dart

// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'package:test/test.dart';
import 'package:ui/ui.dart';

void main() {
  test('Should have no subpaths when created', () {
    final Path path = Path();
    expect(path.subpaths.length, 0);
  });

  test('LineTo should add command', () {
    final Path path = Path();
    path.moveTo(5.0, 10.0);
    path.lineTo(20.0, 40.0);
    path.lineTo(30.0, 50.0);
    expect(path.subpaths.length, 1);
    expect(path.subpaths[0].currentX, 30.0);
    expect(path.subpaths[0].currentY, 50.0);
  });

  test('LineTo should add moveTo 0,0 when first call to Path API', () {
    final Path path = Path();
    path.lineTo(20.0, 40.0);
    expect(path.subpaths.length, 1);
    expect(path.subpaths[0].currentX, 20.0);
    expect(path.subpaths[0].currentY, 40.0);
  });

  test('relativeLineTo should increments currentX', () {
    final Path path = Path();
    path.moveTo(5.0, 10.0);
    path.lineTo(20.0, 40.0);
    path.relativeLineTo(5.0, 5.0);
    expect(path.subpaths.length, 1);
    expect(path.subpaths[0].currentX, 25.0);
    expect(path.subpaths[0].currentY, 45.0);
  });

  test('Should allow calling relativeLineTo before moveTo', () {
    final Path path = Path();
    path.relativeLineTo(5.0, 5.0);
    path.moveTo(5.0, 10.0);
    expect(path.subpaths.length, 2);
    expect(path.subpaths[0].currentX, 5.0);
    expect(path.subpaths[0].currentY, 5.0);
    expect(path.subpaths[1].currentX, 5.0);
    expect(path.subpaths[1].currentY, 10.0);
  });

  test('Should allow relativeLineTo after reset', () {
    final Path path = Path();
    final Path subPath = Path();
    subPath.moveTo(50.0, 60.0);
    subPath.lineTo(200.0, 200.0);
    path.extendWithPath(subPath, Offset(0.0, 0.0));
    path.reset();
    path.relativeLineTo(5.0, 5.0);
    expect(path.subpaths.length, 1);
    expect(path.subpaths[0].currentX, 5.0);
    expect(path.subpaths[0].currentY, 5.0);
  });

  test('Should detect rectangular path', () {
    final Path path = Path();
    path.addRect(Rect.fromLTWH(1.0, 2.0, 3.0, 4.0));
    expect(path.webOnlyPathAsRect, Rect.fromLTWH(1.0, 2.0, 3.0, 4.0));
  });

  test('Should detect non rectangular path if empty', () {
    final Path path = Path();
    expect(path.webOnlyPathAsRect, null);
  });

  test('Should detect non rectangular path if there are multiple subpaths', () {
    final Path path = Path();
    path.addRect(Rect.fromLTWH(1.0, 2.0, 3.0, 4.0));
    path.addRect(Rect.fromLTWH(5.0, 6.0, 7.0, 8.0));
    expect(path.webOnlyPathAsRect, null);
  });

  test('Should detect rounded rectangular path', () {
    final Path path = Path();
    path.addRRect(RRect.fromRectAndRadius(
        Rect.fromLTWH(1.0, 2.0, 3.0, 4.0), Radius.circular(2.0)));
    expect(
        path.webOnlyPathAsRoundedRect,
        RRect.fromRectAndRadius(
            Rect.fromLTWH(1.0, 2.0, 3.0, 4.0), Radius.circular(2.0)));
  });

  test('Should detect non rounded rectangular path if empty', () {
    final Path path = new Path();
    expect(path.webOnlyPathAsRoundedRect, null);
  });

  test('Should detect rectangular path is not round', () {
    final Path path = new Path();
    path.addRect(Rect.fromLTWH(1.0, 2.0, 3.0, 4.0));
    expect(path.webOnlyPathAsRoundedRect, null);
  });

  test(
      'Should detect non rounded  rectangular path if there are '
      'multiple subpaths', () {
    final Path path = new Path();
    path.addRRect(RRect.fromRectAndRadius(
        Rect.fromLTWH(1.0, 2.0, 3.0, 4.0), Radius.circular(2.0)));
    path.addRRect(RRect.fromRectAndRadius(
        Rect.fromLTWH(1.0, 2.0, 3.0, 4.0), Radius.circular(2.0)));
    expect(path.webOnlyPathAsRoundedRect, null);
  });

  test('Should compute bounds as empty for empty and moveTo only path', () {
    final Path emptyPath = new Path();
    expect(emptyPath.getBounds(), Rect.zero);

    final Path path = new Path();
    path.moveTo(50, 60);
    expect(path.getBounds(), Rect.fromLTRB(50, 60, 50, 60));
  });

  test('Should compute bounds for lines', () {
    final Path path = new Path();
    path.moveTo(25, 30);
    path.lineTo(100, 200);
    expect(path.getBounds(), Rect.fromLTRB(25, 30, 100, 200));

    final Path path2 = new Path();
    path2.moveTo(250, 300);
    path2.lineTo(50, 60);
    expect(path2.getBounds(), Rect.fromLTRB(50, 60, 250, 300));
  });

  // test('Should compute bounds for quadraticBezierTo', () {
  //   final Path path1 = new Path();
  //   path1.moveTo(285.2, 682.1);
  //   path1.quadraticBezierTo(432.0, 431.4, 594.9, 681.2);
  //   expect(
  //       path1.getBounds(),
  //       within<Rect>(
  //           distance: 0.1, from: Rect.fromLTRB(285.2, 556.5, 594.9, 682.1)));

  //   // Control point below start , end.
  //   final Path path2 = new Path();
  //   path2.moveTo(285.2, 682.1);
  //   path2.quadraticBezierTo(447.4, 946.8, 594.9, 681.2);
  //   expect(
  //       path2.getBounds(),
  //       within<Rect>(
  //           distance: 0.1, from: Rect.fromLTRB(285.2, 681.2, 594.9, 814.2)));

  //   // Control point to the right of end point.
  //   final Path path3 = new Path();
  //   path3.moveTo(468.3, 685.6);
  //   path3.quadraticBezierTo(644.7, 555.2, 594.9, 681.2);
  //   expect(
  //       path3.getBounds(),
  //       within<Rect>(
  //           distance: 0.1, from: Rect.fromLTRB(468.3, 619.3, 605.9, 685.6)));
  // });

  // test('Should compute bounds for cubicTo', () {
  //   final Path path1 = new Path();
  //   path1.moveTo(220, 300);
  //   path1.cubicTo(230, 120, 400, 125, 410, 280);
  //   expect(
  //       path1.getBounds(),
  //       within<Rect>(
  //           distance: 0.1, from: Rect.fromLTRB(220.0, 164.3, 410.0, 300.0)));

  //   // control point 1 to the right of control point 2
  //   final Path path2 = new Path();
  //   path2.moveTo(220, 300);
  //   path2.cubicTo(564.2, 13.7, 400.0, 125.0, 410.0, 280.0);
  //   expect(
  //       path2.getBounds(),
  //       within<Rect>(
  //           distance: 0.1, from: Rect.fromLTRB(220.0, 122.8, 440.5, 300.0)));

  //   // control point 1 to the right of control point 2 inflection
  //   final Path path3 = new Path();
  //   path3.moveTo(220, 300);
  //   path3.cubicTo(839.8, 67.9, 400.0, 125.0, 410.0, 280.0);
  //   expect(
  //       path3.getBounds(),
  //       within<Rect>(
  //           distance: 0.1, from: Rect.fromLTRB(220.0, 144.5, 552.1, 300.0)));

  //   // control point 1 below and between start and end points
  //   final Path path4 = new Path();
  //   path4.moveTo(220.0, 300.0);
  //   path4.cubicTo(354.8, 388.3, 400.0, 125.0, 410.0, 280.0);
  //   expect(
  //       path4.getBounds(),
  //       within<Rect>(
  //           distance: 0.1, from: Rect.fromLTRB(220.0, 230.0, 410.0, 318.6)));

  //   // control points inverted below
  //   final Path path5 = new Path();
  //   path5.moveTo(220.0, 300.0);
  //   path5.cubicTo(366.5, 487.3, 256.4, 489.9, 410.0, 280.0);
  //   expect(
  //       path5.getBounds(),
  //       within<Rect>(
  //           distance: 0.1, from: Rect.fromLTRB(220.0, 280.0, 410.0, 439.0)));

  //   // control points inverted below wide
  //   final Path path6 = new Path();
  //   path6.moveTo(220.0, 300.0);
  //   path6.cubicTo(496.1, 485.5, 121.4, 491.6, 410.0, 280.0);
  //   expect(
  //       path6.getBounds(),
  //       within<Rect>(
  //           distance: 0.1, from: Rect.fromLTRB(220.0, 280.0, 410.0, 439.0)));

  //   // control point 2 and end point swapped
  //   final Path path7 = new Path();
  //   path7.moveTo(220.0, 300.0);
  //   path7.cubicTo(230.0, 120.0, 394.5, 296.1, 382.3, 124.1);
  //   expect(
  //       path7.getBounds(),
  //       within<Rect>(
  //           distance: 0.1, from: Rect.fromLTRB(220.0, 124.1, 382.9, 300.0)));
  // });
}