c# - InkCanvas 保存产生错误的尺寸

Question

我使用具有固定宽度和高度的 Canvas 。它有 500x500 大，我也想用这种方法保存它:

    private async void SaveasGIF(object sender, RoutedEventArgs e)
    {
        var savePicker = new Windows.Storage.Pickers.FileSavePicker();
        savePicker.SuggestedStartLocation = Windows.Storage.Pickers.PickerLocationId.PicturesLibrary;
        savePicker.FileTypeChoices.Add("Gif with embedded ISF", new[] { ".gif" });

        Windows.Storage.StorageFile file = await savePicker.PickSaveFileAsync();
        if (null != file)
        {
            try
            {
                using (Windows.Storage.Streams.IRandomAccessStream stream = await file.OpenAsync(Windows.Storage.FileAccessMode.ReadWrite))
                {
                    // Truncate any existing stream in case the new file
                    // is smaller than the old file.
                    stream.Size = 0;

                    await MyInkCanvas.InkPresenter.StrokeContainer.SaveAsync(stream);
                }
                //MainPage.NotifyUser("File has been saved!", NotifyType.StatusMessage);
            }
            catch (Exception ex)
            {
                //MainPage.NotifyUser(ex.Message, NotifyType.ErrorMessage);
            }
        }
        SaveGIF.IsChecked = false;
    }

但是当我这样做时，完成的 .gif 文件被裁剪并且尺寸类似于 421x643。

我可以做些什么来解决这个问题？

Answer 1

此代码 await MyInkCanvas.InkPresenter.StrokeContainer.SaveAsync(stream); 用于将墨迹笔画集合保存到文件中。这与将 InkCanvas 控件的内容渲染到图像中并不完全相同。如果笔划超出 InkCanvas，生成的 .gif 尺寸将大于原始 InkCanvas 的尺寸，反之亦然。

如果您的主要目标是将 InkCanvas 的内容保存为图像(而不是您计划稍后加载到 InkCanvas 中的墨迹笔划) , 使用 Win2D as described here .