// <copyright file="SkewTest.cs" company="James Jackson-South">
// Copyright (c) James Jackson-South and contributors.
// Licensed under the Apache License, Version 2.0.
// </copyright>

namespace ImageSharp.Tests
{
    using System.IO;

    using Xunit;

    public class SkewTest : FileTestBase
    {
        public static readonly TheoryData<float, float> SkewValues
        = new TheoryData<float, float>
        {
            { 20, 10 },
            { -20, -10 }
        };

        [Theory]
        [MemberData("SkewValues")]
        public void ImageShouldApplySkewSampler(float x, float y)
        {
            string path = CreateOutputDirectory("Skew");

            // Matches live example 
            // http://www.w3schools.com/css/tryit.asp?filename=trycss3_transform_skew
            foreach (TestFile file in Files)
            {
                string filename = file.GetFileName(x + "-" + y);
                Image image = file.CreateImage();

                using (FileStream output = File.OpenWrite($"{path}/{filename}"))
                {
                    image.Skew(x, y)
                          .Save(output);
                }
            }
        }
    }
}