ImageSharp/tests/ImageSharp.Tests/Primitives/RectangleFTests.cs

// Copyright (c) Six Labors.
// Licensed under the Apache License, Version 2.0.

using System;
using System.Globalization;
using Xunit;

namespace SixLabors.ImageSharp.Tests
{
    /// <summary>
    /// Tests the <see cref="RectangleF"/> struct.
    /// </summary>
    public class RectangleFTests
    {
        [Fact]
        public void DefaultConstructorTest()
        {
            Assert.Equal(default, RectangleF.Empty);
        }

        [Theory]
        [InlineData(0, 0, 0, 0)]
        [InlineData(float.MaxValue, float.MinValue, float.MinValue, float.MaxValue)]
        [InlineData(float.MaxValue, 0, 0, float.MaxValue)]
        [InlineData(0, float.MinValue, float.MaxValue, 0)]
        public void NonDefaultConstructorTest(float x, float y, float width, float height)
        {
            var rect1 = new RectangleF(x, y, width, height);
            var p = new PointF(x, y);
            var s = new SizeF(width, height);
            var rect2 = new RectangleF(p, s);

            Assert.Equal(rect1, rect2);
        }

        [Theory]
        [InlineData(0, 0, 0, 0)]
        [InlineData(float.MaxValue, float.MinValue, float.MinValue, float.MaxValue)]
        [InlineData(float.MaxValue, 0, 0, float.MaxValue)]
        [InlineData(0, float.MinValue, float.MaxValue, 0)]
        public void FromLTRBTest(float left, float top, float right, float bottom)
        {
            var expected = new RectangleF(left, top, right - left, bottom - top);
            var actual = RectangleF.FromLTRB(left, top, right, bottom);

            Assert.Equal(expected, actual);
        }

        [Theory]
        [InlineData(0, 0, 0, 0)]
        [InlineData(float.MaxValue, float.MinValue, float.MinValue, float.MaxValue)]
        [InlineData(float.MaxValue, 0, 0, float.MaxValue)]
        [InlineData(0, float.MinValue, float.MaxValue, 0)]
        public void DimensionsTest(float x, float y, float width, float height)
        {
            var rect = new RectangleF(x, y, width, height);
            var p = new PointF(x, y);
            var s = new SizeF(width, height);

            Assert.Equal(p, rect.Location);
            Assert.Equal(s, rect.Size);
            Assert.Equal(x, rect.X);
            Assert.Equal(y, rect.Y);
            Assert.Equal(width, rect.Width);
            Assert.Equal(height, rect.Height);
            Assert.Equal(x, rect.Left);
            Assert.Equal(y, rect.Top);
            Assert.Equal(x + width, rect.Right);
            Assert.Equal(y + height, rect.Bottom);
        }

        [Fact]
        public void IsEmptyTest()
        {
            Assert.True(RectangleF.Empty.IsEmpty);
            Assert.True(default(RectangleF).IsEmpty);
            Assert.True(new RectangleF(1, -2, -10, 10).IsEmpty);
            Assert.True(new RectangleF(1, -2, 10, -10).IsEmpty);
            Assert.True(new RectangleF(1, -2, 0, 0).IsEmpty);

            Assert.False(new RectangleF(0, 0, 10, 10).IsEmpty);
        }

        [Theory]
        [InlineData(0, 0)]
        [InlineData(float.MaxValue, float.MinValue)]
        public void LocationSetTest(float x, float y)
        {
            var point = new PointF(x, y);
            var rect = new RectangleF(10, 10, 10, 10) { Location = point };
            Assert.Equal(point, rect.Location);
            Assert.Equal(point.X, rect.X);
            Assert.Equal(point.Y, rect.Y);
        }

        [Theory]
        [InlineData(0, 0)]
        [InlineData(float.MaxValue, float.MinValue)]
        public void SizeSetTest(float x, float y)
        {
            var size = new SizeF(x, y);
            var rect = new RectangleF(10, 10, 10, 10) { Size = size };
            Assert.Equal(size, rect.Size);
            Assert.Equal(size.Width, rect.Width);
            Assert.Equal(size.Height, rect.Height);
        }

        [Theory]
        [InlineData(float.MaxValue, float.MinValue, float.MinValue, float.MaxValue)]
        [InlineData(float.MaxValue, 0, 0, float.MaxValue)]
        [InlineData(0, float.MinValue, float.MaxValue, 0)]
        public void EqualityTest(float x, float y, float width, float height)
        {
            var rect1 = new RectangleF(x, y, width, height);
            var rect2 = new RectangleF(width, height, x, y);

            Assert.True(rect1 != rect2);
            Assert.False(rect1 == rect2);
            Assert.False(rect1.Equals(rect2));
            Assert.False(rect1.Equals((object)rect2));
        }

        [Fact]
        public void EqualityTestNotRectangleF()
        {
            var rectangle = new RectangleF(0, 0, 0, 0);
            Assert.False(rectangle.Equals(null));
            Assert.False(rectangle.Equals(0));

            // If RectangleF implements IEquatable<RectangleF> (e.g. in .NET Core), then classes that are implicitly
            // convertible to RectangleF can potentially be equal.
            // See https://github.com/dotnet/corefx/issues/5255.
            bool expectsImplicitCastToRectangleF = typeof(IEquatable<RectangleF>).IsAssignableFrom(rectangle.GetType());
            Assert.Equal(expectsImplicitCastToRectangleF, rectangle.Equals(new Rectangle(0, 0, 0, 0)));

            Assert.False(rectangle.Equals((object)new Rectangle(0, 0, 0, 0))); // No implicit cast
        }

        [Fact]
        public void GetHashCodeTest()
        {
            var rect1 = new RectangleF(10, 10, 10, 10);
            var rect2 = new RectangleF(10, 10, 10, 10);
            Assert.Equal(rect1.GetHashCode(), rect2.GetHashCode());
            Assert.NotEqual(rect1.GetHashCode(), new RectangleF(20, 10, 10, 10).GetHashCode());
            Assert.NotEqual(rect1.GetHashCode(), new RectangleF(10, 20, 10, 10).GetHashCode());
            Assert.NotEqual(rect1.GetHashCode(), new RectangleF(10, 10, 20, 10).GetHashCode());
            Assert.NotEqual(rect1.GetHashCode(), new RectangleF(10, 10, 10, 20).GetHashCode());
        }

        [Theory]
        [InlineData(float.MaxValue, float.MinValue, float.MinValue, float.MaxValue)]
        [InlineData(0, float.MinValue, float.MaxValue, 0)]
        public void ContainsTest(float x, float y, float width, float height)
        {
            var rect = new RectangleF(x, y, width, height);
            float x1 = (x + width) / 2;
            float y1 = (y + height) / 2;
            var p = new PointF(x1, y1);
            var r = new RectangleF(x1, y1, width / 2, height / 2);

            Assert.False(rect.Contains(x1, y1));
            Assert.False(rect.Contains(p));
            Assert.False(rect.Contains(r));
        }

        [Theory]
        [InlineData(0, 0, 0, 0)]
        [InlineData(float.MaxValue / 2, float.MinValue / 2, float.MinValue / 2, float.MaxValue / 2)]
        [InlineData(0, float.MinValue, float.MaxValue, 0)]
        public void InflateTest(float x, float y, float width, float height)
        {
            var rect = new RectangleF(x, y, width, height);
            var inflatedRect = new RectangleF(x - width, y - height, width + (2 * width), height + (2 * height));

            rect.Inflate(width, height);
            Assert.Equal(inflatedRect, rect);

            var s = new SizeF(x, y);
            inflatedRect = RectangleF.Inflate(rect, x, y);

            rect.Inflate(s);
            Assert.Equal(inflatedRect, rect);
        }

        [Theory]
        [InlineData(float.MaxValue, float.MinValue, float.MaxValue / 2, float.MinValue / 2)]
        [InlineData(0, float.MinValue, float.MaxValue, 0)]
        public void IntersectTest(float x, float y, float width, float height)
        {
            var rect1 = new RectangleF(x, y, width, height);
            var rect2 = new RectangleF(y, x, width, height);
            var expectedRect = RectangleF.Intersect(rect1, rect2);
            rect1.Intersect(rect2);
            Assert.Equal(expectedRect, rect1);
            Assert.False(rect1.IntersectsWith(expectedRect));
        }

        [Fact]
        public void IntersectIntersectingRectsTest()
        {
            var rect1 = new RectangleF(0, 0, 5, 5);
            var rect2 = new RectangleF(1, 1, 3, 3);
            var expected = new RectangleF(1, 1, 3, 3);

            Assert.Equal(expected, RectangleF.Intersect(rect1, rect2));
        }

        [Theory]
        [InlineData(0, 0, 0, 0)]
        [InlineData(float.MaxValue, float.MinValue, float.MinValue, float.MaxValue)]
        [InlineData(float.MaxValue, 0, 0, float.MaxValue)]
        [InlineData(0, float.MinValue, float.MaxValue, 0)]
        public void UnionTest(float x, float y, float width, float height)
        {
            var a = new RectangleF(x, y, width, height);
            var b = new RectangleF(width, height, x, y);

            float x1 = Math.Min(a.X, b.X);
            float x2 = Math.Max(a.X + a.Width, b.X + b.Width);
            float y1 = Math.Min(a.Y, b.Y);
            float y2 = Math.Max(a.Y + a.Height, b.Y + b.Height);

            var expectedRectangle = new RectangleF(x1, y1, x2 - x1, y2 - y1);

            Assert.Equal(expectedRectangle, RectangleF.Union(a, b));
        }

        [Theory]
        [InlineData(0, 0, 0, 0)]
        [InlineData(float.MaxValue, float.MinValue, float.MinValue, float.MaxValue)]
        [InlineData(float.MaxValue, 0, 0, float.MaxValue)]
        [InlineData(0, float.MinValue, float.MaxValue, 0)]
        public void OffsetTest(float x, float y, float width, float height)
        {
            var r1 = new RectangleF(x, y, width, height);
            var expectedRect = new RectangleF(x + width, y + height, width, height);
            var p = new PointF(width, height);

            r1.Offset(p);
            Assert.Equal(expectedRect, r1);

            expectedRect.Offset(p);
            r1.Offset(width, height);
            Assert.Equal(expectedRect, r1);
        }

        [Fact]
        public void ToStringTest()
        {
            var r = new RectangleF(5, 5.1F, 1.3F, 1);
            Assert.Equal(string.Format(CultureInfo.CurrentCulture, "RectangleF [ X={0}, Y={1}, Width={2}, Height={3} ]", r.X, r.Y, r.Width, r.Height), r.ToString());
        }

        [Theory]
        [InlineData(float.MinValue, float.MaxValue, float.MaxValue, float.MaxValue)]
        [InlineData(float.MinValue, float.MaxValue, float.MaxValue, float.MinValue)]
        [InlineData(float.MinValue, float.MaxValue, float.MinValue, float.MaxValue)]
        [InlineData(float.MinValue, float.MaxValue, float.MinValue, float.MinValue)]
        [InlineData(float.MinValue, float.MinValue, float.MaxValue, float.MaxValue)]
        [InlineData(float.MinValue, float.MinValue, float.MaxValue, float.MinValue)]
        [InlineData(float.MinValue, float.MinValue, float.MinValue, float.MaxValue)]
        [InlineData(float.MinValue, float.MinValue, float.MinValue, float.MinValue)]
        [InlineData(float.MaxValue, float.MaxValue, float.MaxValue, float.MaxValue)]
        [InlineData(float.MaxValue, float.MaxValue, float.MaxValue, float.MinValue)]
        [InlineData(float.MaxValue, float.MaxValue, float.MinValue, float.MaxValue)]
        [InlineData(float.MaxValue, float.MaxValue, float.MinValue, float.MinValue)]
        [InlineData(float.MaxValue, float.MinValue, float.MaxValue, float.MaxValue)]
        [InlineData(float.MaxValue, float.MinValue, float.MaxValue, float.MinValue)]
        [InlineData(float.MaxValue, float.MinValue, float.MinValue, float.MaxValue)]
        [InlineData(float.MaxValue, float.MinValue, float.MinValue, float.MinValue)]
        [InlineData(0, 0, 0, 0)]
        public void DeconstructTest(float x, float y, float width, float height)
        {
            RectangleF r = new RectangleF(x, y, width, height);

            (float dx, float dy, float dw, float dh) = r;

            Assert.Equal(x, dx);
            Assert.Equal(y, dy);
            Assert.Equal(width, dw);
            Assert.Equal(height, dh);
        }
    }
}