ImageSharp/tests/ImageSharp.Tests/Processing/Transforms/ProjectiveTransformBuilderTests.cs

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

using System;
using System.Numerics;
using SixLabors.ImageSharp.Processing;
using SixLabors.Primitives;
using Xunit;

namespace SixLabors.ImageSharp.Tests.Processing.Transforms
{
    public class ProjectiveTransformBuilderTests : TransformBuilderTestBase<ProjectiveTransformBuilder>
    {
        [Fact]
        public void ConstructorAssignsProperties()
        {
            var s = new Size(1, 1);
            var builder = new ProjectiveTransformBuilder(new Rectangle(Point.Empty, s));
            Assert.Equal(s, builder.Size);
        }

        [Fact]
        public void ConstructorThrowsInvalid()
        {
            Assert.Throws<ArgumentOutOfRangeException>(() =>
            {
                var s = new Size(0, 1);
                var builder = new ProjectiveTransformBuilder(new Rectangle(Point.Empty, s));
            });

            Assert.Throws<ArgumentOutOfRangeException>(() =>
            {
                var s = new Size(1, 0);
                var builder = new ProjectiveTransformBuilder(new Rectangle(Point.Empty, s));
            });
        }
        protected override void AppendTranslation(ProjectiveTransformBuilder builder, PointF translate) => builder.AppendTranslation(translate);
        protected override void AppendScale(ProjectiveTransformBuilder builder, SizeF scale) => builder.AppendScale(scale);
        protected override void AppendRotationRadians(ProjectiveTransformBuilder builder, float radians) => builder.AppendRotationRadians(radians);

        protected override void PrependTranslation(ProjectiveTransformBuilder builder, PointF translate) => builder.PrependTranslation(translate);
        protected override void PrependScale(ProjectiveTransformBuilder builder, SizeF scale) => builder.PrependScale(scale);
        protected override void PrependRotationRadians(ProjectiveTransformBuilder builder, float radians) => builder.PrependRotationRadians(radians);

        protected override Vector2 Execute(
            ProjectiveTransformBuilder builder,
            Rectangle rectangle,
            Vector2 sourcePoint)
        {
            Matrix4x4 matrix = builder.BuildMatrix();
            return Vector2.Transform(sourcePoint, matrix);
        }
    }
}