winforms/src/System.Drawing.Common/tests/Graphics_GetContextTests.cs at main · reactapi/winforms · GitHub

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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using System.Drawing.Drawing2D;
using Xunit;

namespace System.Drawing.Tests
{
#pragma warning disable SYSLIB0016 // Type or member is obsolete
    public partial class Graphics_GetContextTests : DrawingTest
    {
        [ConditionalFact(Helpers.IsWindows)]
        public void GetContextInfo_DefaultGraphics()
        {
            using (var image = new Bitmap(10, 10))
            using (Graphics graphics = Graphics.FromImage(image))
            {
                object info = graphics.GetContextInfo();
                Assert.IsType<object[]>(info);
                object[] infoArray = (object[])info;
                Assert.Equal(2, infoArray.Length);
                Assert.IsType<Region>(infoArray[0]);
                Assert.IsType<Matrix>(infoArray[1]);
                using (Region region = (Region)infoArray[0])
                using (Matrix matrix = (Matrix)infoArray[1])
                {
                    Assert.True(region.IsInfinite(graphics));
                    Assert.True(matrix.IsIdentity);
                }
            }
        }

        [ConditionalFact(Helpers.IsWindows)]
        public void GetContextInfo_Clipping()
        {
            using (var image = new Bitmap(10, 10))
            using (Graphics graphics = Graphics.FromImage(image))
            using (Region initialClip = new Region(new Rectangle(1, 2, 9, 10)))
            {
                graphics.Clip = initialClip;

                object[] info = (object[])graphics.GetContextInfo();
                using (Region region = (Region)info[0])
                using (Matrix matrix = (Matrix)info[1])
                {
                    Assert.Equal(initialClip.GetBounds(graphics), region.GetBounds(graphics));
                    Assert.True(matrix.IsIdentity);
                }
            }
        }

        [ConditionalFact(Helpers.IsWindows)]
        public void GetContextInfo_Transform()
        {
            using (var image = new Bitmap(10, 10))
            using (Graphics graphics = Graphics.FromImage(image))
            using (Matrix initialTransform = new Matrix())
            {
                initialTransform.Translate(1, 2);
                graphics.Transform = initialTransform;

                object[] info = (object[])graphics.GetContextInfo();
                using (Region region = (Region)info[0])
                using (Matrix matrix = (Matrix)info[1])
                {
                    Assert.True(region.IsInfinite(graphics));
                    Assert.Equal(initialTransform, matrix);
                }
            }
        }

        [ConditionalFact(Helpers.IsWindows)]
        public void GetContextInfo_ClipAndTransform()
        {
            using (var image = new Bitmap(10, 10))
            using (Graphics graphics = Graphics.FromImage(image))
            using (Matrix initialTransform = new Matrix())
            using (Region initialClip = new Region(new Rectangle(1, 2, 9, 10)))
            {
                graphics.Clip = initialClip;
                initialTransform.Translate(1, 2);
                graphics.Transform = initialTransform;

                object[] info = (object[])graphics.GetContextInfo();
                using (Region region = (Region)info[0])
                using (Matrix matrix = (Matrix)info[1])
                {
                    Assert.Equal(new RectangleF(0, 0, 9, 10), region.GetBounds(graphics));
                    Assert.Equal(initialTransform, matrix);
                }
            }
        }

        [ConditionalFact(Helpers.IsWindows)]
        public void GetContextInfo_TransformAndClip()
        {
            using (var image = new Bitmap(10, 10))
            using (Graphics graphics = Graphics.FromImage(image))
            using (Matrix initialTransform = new Matrix())
            using (Region initialClip = new Region(new Rectangle(1, 2, 9, 10)))
            {
                initialTransform.Translate(1, 2);
                graphics.Transform = initialTransform;
                graphics.Clip = initialClip;

                object[] info = (object[])graphics.GetContextInfo();
                using (Region region = (Region)info[0])
                using (Matrix matrix = (Matrix)info[1])
                {
                    Assert.Equal(new RectangleF(1, 2, 9, 10), region.GetBounds(graphics));
                    Assert.Equal(initialTransform, matrix);
                }
            }
        }

        [ConditionalFact(Helpers.IsWindows)]
        public void GetContextInfo_ClipAndTransformSaveState()
        {
            using (var image = new Bitmap(10, 10))
            using (Graphics graphics = Graphics.FromImage(image))
            using (Matrix initialTransform = new Matrix())
            using (Region initialClip = new Region(new Rectangle(1, 2, 9, 10)))
            {
                graphics.Clip = initialClip;
                initialTransform.Translate(1, 2);
                graphics.Transform = initialTransform;

                GraphicsState state = graphics.Save();
                object[] info = (object[])graphics.GetContextInfo();

                using (Region region = (Region)info[0])
                using (Matrix matrix = (Matrix)info[1])
                {
                    initialTransform.Translate(1, 2);
                    Assert.Equal(new RectangleF(0, 0, 8, 8), region.GetBounds(graphics));
                    Assert.Equal(initialTransform, matrix);
                }
            }
        }

        [ConditionalFact(Helpers.IsWindows)]
        public void GetContextInfo_ClipAndTransformSaveAndRestoreState()
        {
            using (var image = new Bitmap(10, 10))
            using (Graphics graphics = Graphics.FromImage(image))
            using (Matrix initialTransform = new Matrix())
            using (Region initialClip = new Region(new Rectangle(1, 2, 9, 10)))
            {
                graphics.Clip = initialClip;
                initialTransform.Translate(1, 2);
                graphics.Transform = initialTransform;

                GraphicsState state = graphics.Save();
                object[] info = (object[])graphics.GetContextInfo();
                graphics.Restore(state);

                using (Region region = (Region)info[0])
                using (Matrix matrix = (Matrix)info[1])
                {
                    initialTransform.Translate(1, 2);
                    Assert.Equal(new RectangleF(0, 0, 8, 8), region.GetBounds(graphics));
                    Assert.Equal(initialTransform, matrix);
                }
            }
        }
    }
#pragma warning restore SYSLIB0016 // Type or member is obsolete
}