[英]cropping image universal app c#
我想在通用應用程序中裁剪帶有x和y的圖像,我搜索了很多,沒有找到任何有用的我的想法是我有一個圖像,我想基於開始x,y - 結束x和y裁剪矩形
我試過這個
BitmapImage img = new BitmapImage(new Uri(file.Path));
WriteableBitmap topLeft = img.Crop(0, 0, halfWidth, halfHeight);
它說BitmapImage不包含crop的定義
另一件事:如何在通用應用程序中將BitmapImage轉換為WriteableBitmap?
您是否嘗試過BitmapEncoder / BitmapDecoder類? 簽出MSDN代碼示例。
/// <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;
}
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