using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Imaging;

namespace FWindSoft.Wpf
{
    public static class ImageUtil
    {
        /// <summary>
        /// 获取图像的中间区域
        /// </summary>
        /// <param name="source"></param>
        /// <returns></returns>
        public static ImageSource GetCenterCropped(BitmapSource source)
        {
            BitmapSource imageSource = source;
            double originWidth = imageSource.Width / 96 * imageSource.DpiX;
            double originHeight = imageSource.Height / 96 * imageSource.DpiY;
            double useSize = Math.Min(originWidth, originHeight);
            var rect = new Int32Rect((int)((originWidth - useSize) / 2), (int)((originHeight - useSize) / 2), (int)useSize - 1, (int)useSize - 1);
            var cropped = new CroppedBitmap(imageSource, rect);
            return cropped;
        }
    }
}