裁剪图像通用应用程序 C#

Question

我想在通用应用程序中使用 x 和 y 裁剪图像，我搜索了很多但没有找到有用的东西我的想法是我有一张图片，我想根据开始 x 、 y - 结束 x 和 y 从中裁剪矩形

我试过这个

BitmapImage img = new BitmapImage(new Uri(file.Path));
WriteableBitmap topLeft = img.Crop(0, 0, halfWidth, halfHeight);

它说 BitmapImage 不包含裁剪的定义

另一件事：如何在通用应用程序中将 BitmapImage 转换为 WriteableBitmap？

Answer 1

你试过BitmapEncoder/BitmapDecoder类了吗？查看 MSDN code sample.

Answer 2

  /// <summary>
        /// Gets the cropped bitmap asynchronously.
        /// </summary>
        /// <param name="originalImage">The original image.</param>
        /// <param name="startPoint">The start point.</param>
        /// <param name="cropSize">Size of the corp.</param>
        /// <param name="scale">The scale.</param>
        /// <returns>The cropped image.</returns>
        public static async Task<WriteableBitmap> GetCroppedBitmapAsync(IRandomAccessStream originalImage,
            Point startPoint, Size cropSize, double scale)
        {
            if (double.IsNaN(scale) || double.IsInfinity(scale))
            {
                scale = 1;
            }

            // Convert start point and size to integer.
            var startPointX = (uint)Math.Floor(startPoint.X * scale);
            var startPointY = (uint)Math.Floor(startPoint.Y * scale);
            var height = (uint)Math.Floor(cropSize.Height * scale);
            var width = (uint)Math.Floor(cropSize.Width * scale);

            // Create a decoder from the stream. With the decoder, we can get 
            // the properties of the image.
            var decoder = await BitmapDecoder.CreateAsync(originalImage);

            // The scaledSize of original image.
            var scaledWidth = (uint)Math.Floor(decoder.PixelWidth * scale);
            var scaledHeight = (uint)Math.Floor(decoder.PixelHeight * scale);

            // Refine the start point and the size. 
            if (startPointX + width > scaledWidth)
            {
                startPointX = scaledWidth - width;
            }

            if (startPointY + height > scaledHeight)
            {
                startPointY = scaledHeight - height;
            }

            // Get the cropped pixels.
            var pixels = await GetPixelData(decoder, startPointX, startPointY, width, height,
                scaledWidth, scaledHeight);

            // Stream the bytes into a WriteableBitmap
            var cropBmp = new WriteableBitmap((int)width, (int)height);
            var pixStream = cropBmp.PixelBuffer.AsStream();
            pixStream.Write(pixels, 0, (int)(width * height * 4));

            return cropBmp;
        }

裁剪图像通用应用程序 C#

cropping image universal app c#

c#

image

crop

image-processing

win-universal-app