• Ian Hickson's avatar
    License update (#45373) · 449f4a66
    Ian Hickson authored
    * Update project.pbxproj files to say Flutter rather than Chromium
    
    Also, the templates now have an empty organization so that we don't cause people to give their apps a Flutter copyright.
    
    * Update the copyright notice checker to require a standard notice on all files
    
    * Update copyrights on Dart files. (This was a mechanical commit.)
    
    * Fix weird license headers on Dart files that deviate from our conventions; relicense Shrine.
    
    Some were already marked "The Flutter Authors", not clear why. Their
    dates have been normalized. Some were missing the blank line after the
    license. Some were randomly different in trivial ways for no apparent
    reason (e.g. missing the trailing period).
    
    * Clean up the copyrights in non-Dart files. (Manual edits.)
    
    Also, make sure templates don't have copyrights.
    
    * Fix some more ORGANIZATIONNAMEs
    Unverified
    449f4a66
transform_test.dart 10 KB
// Copyright 2014 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 'dart:math' as math;

import 'package:flutter/rendering.dart';
import '../flutter_test_alternative.dart';

import 'rendering_tester.dart';

Offset round(Offset value) {
  return Offset(value.dx.roundToDouble(), value.dy.roundToDouble());
}

void main() {
  test('RenderTransform - identity', () {
    RenderBox inner;
    final RenderBox sizer = RenderTransform(
      transform: Matrix4.identity(),
      alignment: Alignment.center,
      child: inner = RenderSizedBox(const Size(100.0, 100.0)),
    );
    layout(sizer, constraints: BoxConstraints.tight(const Size(100.0, 100.0)), alignment: Alignment.topLeft);
    expect(inner.globalToLocal(const Offset(0.0, 0.0)), equals(const Offset(0.0, 0.0)));
    expect(inner.globalToLocal(const Offset(100.0, 100.0)), equals(const Offset(100.0, 100.0)));
    expect(inner.globalToLocal(const Offset(25.0, 75.0)), equals(const Offset(25.0, 75.0)));
    expect(inner.globalToLocal(const Offset(50.0, 50.0)), equals(const Offset(50.0, 50.0)));
    expect(inner.localToGlobal(const Offset(0.0, 0.0)), equals(const Offset(0.0, 0.0)));
    expect(inner.localToGlobal(const Offset(100.0, 100.0)), equals(const Offset(100.0, 100.0)));
    expect(inner.localToGlobal(const Offset(25.0, 75.0)), equals(const Offset(25.0, 75.0)));
    expect(inner.localToGlobal(const Offset(50.0, 50.0)), equals(const Offset(50.0, 50.0)));
  });

  test('RenderTransform - identity with internal offset', () {
    RenderBox inner;
    final RenderBox sizer = RenderTransform(
      transform: Matrix4.identity(),
      alignment: Alignment.center,
      child: RenderPadding(
        padding: const EdgeInsets.only(left: 20.0),
        child: inner = RenderSizedBox(const Size(80.0, 100.0)),
      ),
    );
    layout(sizer, constraints: BoxConstraints.tight(const Size(100.0, 100.0)), alignment: Alignment.topLeft);
    expect(inner.globalToLocal(const Offset(0.0, 0.0)), equals(const Offset(-20.0, 0.0)));
    expect(inner.globalToLocal(const Offset(100.0, 100.0)), equals(const Offset(80.0, 100.0)));
    expect(inner.globalToLocal(const Offset(25.0, 75.0)), equals(const Offset(5.0, 75.0)));
    expect(inner.globalToLocal(const Offset(50.0, 50.0)), equals(const Offset(30.0, 50.0)));
    expect(inner.localToGlobal(const Offset(0.0, 0.0)), equals(const Offset(20.0, 0.0)));
    expect(inner.localToGlobal(const Offset(100.0, 100.0)), equals(const Offset(120.0, 100.0)));
    expect(inner.localToGlobal(const Offset(25.0, 75.0)), equals(const Offset(45.0, 75.0)));
    expect(inner.localToGlobal(const Offset(50.0, 50.0)), equals(const Offset(70.0, 50.0)));
  });

  test('RenderTransform - translation', () {
    RenderBox inner;
    final RenderBox sizer = RenderTransform(
      transform: Matrix4.translationValues(50.0, 200.0, 0.0),
      alignment: Alignment.center,
      child: inner = RenderSizedBox(const Size(100.0, 100.0)),
    );
    layout(sizer, constraints: BoxConstraints.tight(const Size(100.0, 100.0)), alignment: Alignment.topLeft);
    expect(inner.globalToLocal(const Offset(0.0, 0.0)), equals(const Offset(-50.0, -200.0)));
    expect(inner.globalToLocal(const Offset(100.0, 100.0)), equals(const Offset(50.0, -100.0)));
    expect(inner.globalToLocal(const Offset(25.0, 75.0)), equals(const Offset(-25.0, -125.0)));
    expect(inner.globalToLocal(const Offset(50.0, 50.0)), equals(const Offset(0.0, -150.0)));
    expect(inner.localToGlobal(const Offset(0.0, 0.0)), equals(const Offset(50.0, 200.0)));
    expect(inner.localToGlobal(const Offset(100.0, 100.0)), equals(const Offset(150.0, 300.0)));
    expect(inner.localToGlobal(const Offset(25.0, 75.0)), equals(const Offset(75.0, 275.0)));
    expect(inner.localToGlobal(const Offset(50.0, 50.0)), equals(const Offset(100.0, 250.0)));
  });

  test('RenderTransform - translation with internal offset', () {
    RenderBox inner;
    final RenderBox sizer = RenderTransform(
      transform: Matrix4.translationValues(50.0, 200.0, 0.0),
      alignment: Alignment.center,
      child: RenderPadding(
        padding: const EdgeInsets.only(left: 20.0),
        child: inner = RenderSizedBox(const Size(80.0, 100.0)),
      ),
    );
    layout(sizer, constraints: BoxConstraints.tight(const Size(100.0, 100.0)), alignment: Alignment.topLeft);
    expect(inner.globalToLocal(const Offset(0.0, 0.0)), equals(const Offset(-70.0, -200.0)));
    expect(inner.globalToLocal(const Offset(100.0, 100.0)), equals(const Offset(30.0, -100.0)));
    expect(inner.globalToLocal(const Offset(25.0, 75.0)), equals(const Offset(-45.0, -125.0)));
    expect(inner.globalToLocal(const Offset(50.0, 50.0)), equals(const Offset(-20.0, -150.0)));
    expect(inner.localToGlobal(const Offset(0.0, 0.0)), equals(const Offset(70.0, 200.0)));
    expect(inner.localToGlobal(const Offset(100.0, 100.0)), equals(const Offset(170.0, 300.0)));
    expect(inner.localToGlobal(const Offset(25.0, 75.0)), equals(const Offset(95.0, 275.0)));
    expect(inner.localToGlobal(const Offset(50.0, 50.0)), equals(const Offset(120.0, 250.0)));
  });

  test('RenderTransform - rotation', () {
    RenderBox inner;
    final RenderBox sizer = RenderTransform(
      transform: Matrix4.rotationZ(math.pi),
      alignment: Alignment.center,
      child: inner = RenderSizedBox(const Size(100.0, 100.0)),
    );
    layout(sizer, constraints: BoxConstraints.tight(const Size(100.0, 100.0)), alignment: Alignment.topLeft);
    expect(round(inner.globalToLocal(const Offset(0.0, 0.0))), equals(const Offset(100.0, 100.0)));
    expect(round(inner.globalToLocal(const Offset(100.0, 100.0))), equals(const Offset(0.0, 0.0)));
    expect(round(inner.globalToLocal(const Offset(25.0, 75.0))), equals(const Offset(75.0, 25.0)));
    expect(round(inner.globalToLocal(const Offset(50.0, 50.0))), equals(const Offset(50.0, 50.0)));
    expect(round(inner.localToGlobal(const Offset(0.0, 0.0))), equals(const Offset(100.0, 100.0)));
    expect(round(inner.localToGlobal(const Offset(100.0, 100.0))), equals(const Offset(0.0, 0.0)));
    expect(round(inner.localToGlobal(const Offset(25.0, 75.0))), equals(const Offset(75.0, 25.0)));
    expect(round(inner.localToGlobal(const Offset(50.0, 50.0))), equals(const Offset(50.0, 50.0)));
  });

  test('RenderTransform - rotation with internal offset', () {
    RenderBox inner;
    final RenderBox sizer = RenderTransform(
      transform: Matrix4.rotationZ(math.pi),
      alignment: Alignment.center,
      child: RenderPadding(
        padding: const EdgeInsets.only(left: 20.0),
        child: inner = RenderSizedBox(const Size(80.0, 100.0)),
      ),
    );
    layout(sizer, constraints: BoxConstraints.tight(const Size(100.0, 100.0)), alignment: Alignment.topLeft);
    expect(round(inner.globalToLocal(const Offset(0.0, 0.0))), equals(const Offset(80.0, 100.0)));
    expect(round(inner.globalToLocal(const Offset(100.0, 100.0))), equals(const Offset(-20.0, 0.0)));
    expect(round(inner.globalToLocal(const Offset(25.0, 75.0))), equals(const Offset(55.0, 25.0)));
    expect(round(inner.globalToLocal(const Offset(50.0, 50.0))), equals(const Offset(30.0, 50.0)));
    expect(round(inner.localToGlobal(const Offset(0.0, 0.0))), equals(const Offset(80.0, 100.0)));
    expect(round(inner.localToGlobal(const Offset(100.0, 100.0))), equals(const Offset(-20.0, 0.0)));
    expect(round(inner.localToGlobal(const Offset(25.0, 75.0))), equals(const Offset(55.0, 25.0)));
    expect(round(inner.localToGlobal(const Offset(50.0, 50.0))), equals(const Offset(30.0, 50.0)));
  });

  test('RenderTransform - perspective - globalToLocal', () {
    RenderBox inner;
    final RenderBox sizer = RenderTransform(
      transform: rotateAroundXAxis(math.pi * 0.25), // at pi/4, we are about 70 pixels high
      alignment: Alignment.center,
      child: inner = RenderSizedBox(const Size(100.0, 100.0)),
    );
    layout(sizer, constraints: BoxConstraints.tight(const Size(100.0, 100.0)), alignment: Alignment.topLeft);

    expect(round(inner.globalToLocal(const Offset(25.0, 50.0))), equals(const Offset(25.0, 50.0)));
    expect(inner.globalToLocal(const Offset(25.0, 17.0)).dy, greaterThan(0.0));
    expect(inner.globalToLocal(const Offset(25.0, 17.0)).dy, lessThan(10.0));
    expect(inner.globalToLocal(const Offset(25.0, 83.0)).dy, greaterThan(90.0));
    expect(inner.globalToLocal(const Offset(25.0, 83.0)).dy, lessThan(100.0));
    expect(round(inner.globalToLocal(const Offset(25.0, 17.0))).dy,
        equals(100 - round(inner.globalToLocal(const Offset(25.0, 83.0))).dy));
  });

  test('RenderTransform - perspective - localToGlobal', () {
    RenderBox inner;
    final RenderBox sizer = RenderTransform(
      transform: rotateAroundXAxis(math.pi * 0.4999), // at pi/2, we're seeing the box on its edge,
      alignment: Alignment.center,
      child: inner = RenderSizedBox(const Size(100.0, 100.0)),
    );
    layout(sizer, constraints: BoxConstraints.tight(const Size(100.0, 100.0)), alignment: Alignment.topLeft);

    // the inner widget has a height of about half a pixel at this rotation, so
    // everything should end up around the middle of the outer box.
    expect(inner.localToGlobal(const Offset(25.0, 50.0)), equals(const Offset(25.0, 50.0)));
    expect(round(inner.localToGlobal(const Offset(25.0, 75.0))), equals(const Offset(25.0, 50.0)));
    expect(round(inner.localToGlobal(const Offset(25.0, 100.0))), equals(const Offset(25.0, 50.0)));
  });
}

Matrix4 rotateAroundXAxis(double a) {
  // 3D rotation transform with alpha=a
  const double x = 1.0;
  const double y = 0.0;
  const double z = 0.0;
  final double sc = math.sin(a / 2.0) * math.cos(a / 2.0);
  final double sq = math.sin(a / 2.0) * math.sin(a / 2.0);
  return Matrix4.fromList(<double>[
    // col 1
    1.0 - 2.0 * (y * y + z * z) * sq,
    2.0 * (x * y * sq + z * sc),
    2.0 * (x * z * sq - y * sc),
    0.0,
    // col 2
    2.0 * (x * y * sq - z * sc),
    1.0 - 2.0 * (x * x + z * z) * sq,
    2.0 * (y * z * sq + x * sc),
    0.0,
    // col 3
    2.0 * (x * z * sq + y * sc),
    2.0 * (y * z * sq - x * sc),
    1.0 - 2.0 * (x * x + z * z) * sq,
    0.0,
    // col 4
    0.0, 0.0, 0.0, 1.0,
  ]);
}