gistfile1.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;

namespace CapyPuzzleSolver
{
    /// <summary>
    /// MainWindow.xaml の相互作用ロジック
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private class Pixel
        {
            public byte R { get; }
            public byte G { get; }
            public byte B { get; }
            public int Index { get; }

            public Pixel(IList<byte> data, int index)
            {
                B = data[0];
                G = data[1];
                R = data[2];
                Index = index;
            }
        }

        private static (int x1, int x2, int y1, int y2) Solve(BitmapSource source)
        {
            var width = source.PixelWidth;
            var height = source.PixelHeight;
            var stride = width * source.Format.BitsPerPixel / 8;
            var data = new byte[stride * height];
            source.CopyPixels(data, stride, 0);

            var pixels = data.Buffer(source.Format.BitsPerPixel / 8).Select((x, i) => new Pixel(x, i));
            var list = new List<(int x, int y)>();

            //何故か背景色がFFA07A固定なのでそれ使って適当に
            list.AddRange(pixels.Where(x =>
                    Math.Abs(x.R - 0xFF) < 5 &&
                    Math.Abs(x.G - 0xA0) < 5 &&
                    Math.Abs(x.B - 0x7A) < 5
                ).Select(x => (x.Index % width, x.Index / width)));

            var x1 = list.Min(x => x.x);
            var x2 = list.Max(x => x.x);
            var y1 = list.Min(x => x.y);
            var y2 = list.Max(x => x.y);

            return (x1, x2, y1, y2);
        }

        private void SetRectangle((int x1, int x2, int y1, int y2) result)
        {
            Rectangle.Margin = new Thickness(result.x1 - 5, result.y1 - 5, 0, 0);
            Rectangle.Width = result.x2 - result.x1 + 10;
            Rectangle.Height = result.y2 - result.y1 + 10;
        }

        private void MainWindow_OnMouseDown(object sender, MouseButtonEventArgs e)
        {
            if (Clipboard.ContainsImage())
            {
                var image = Clipboard.GetImage();
                var bitmap = new FormatConvertedBitmap(image, PixelFormats.Bgr32, null, 0);
                Image.Source = bitmap;
                SetRectangle(Solve(bitmap));
            }
        }
    }
}