private static void SaveCanvasAsImg()
{
var path = DialogService.Current.GetSaveFilePath(SaveAsImg_DefaultFileName);
if (string.IsNullOrEmpty(path))
{
return;
}
try {
using (var fs = File.Create(path)) {
CanvasService.CanvasDataContext.CommitEdit();
var drawObjects = CanvasService.CanvasDataContext.GetAllVisibleDrawObjects();
var setting = new ExportImgSetting(fs);
ServiceProvider.GetInstance <IExportCanvasAsImgService>().ExportDrawObjectsAsImg(drawObjects, setting);
}
if (MsgBoxService.Show(
LanguageService.FindResourceString(
MsgText_ConfirmToShowExportedDirectory
),
MessageBoxButton.YesNo
) == MessageBoxResult.Yes)
{
LocalExplorerService.OpenFolderAndSelectFile(path);
}
}
catch (Exception ex) {
LoggerService.WriteException(ex);
MsgBoxService.Show(ex.Message);
}
}
public void ExportDrawObjectsAsImg(IEnumerable <DrawObject> drawObjects, ExportImgSetting exportImgSetting)
{
if (drawObjects == null)
{
throw new ArgumentNullException(nameof(drawObjects));
}
if (exportImgSetting == null)
{
throw new ArgumentNullException(nameof(exportImgSetting));
}
if (exportImgSetting.ExportStream == null)
{
throw new ArgumentNullException(nameof(exportImgSetting.ExportStream));
}
var stream = exportImgSetting.ExportStream;
if (!stream.CanWrite)
{
throw new ArgumentException($"{nameof(stream)} can't be written.");
}
var width = exportImgSetting.Width;
var height = exportImgSetting.Height;
var renderTargetBitMap = new RenderTargetBitmap(
width, height,
ScreenResolution,
ScreenResolution,
PixelFormats.Default
);
///使用<see cref="DrawingVisual"/>作为<see cref="Visual"/>参数;
var drawingVisual = new DrawingVisual {
Clip = new RectangleGeometry(new Rect {
Width = width,
Height = height
})
};
var drawingContext = drawingVisual.RenderOpen();
var canvasProxy = new WindowsCanvasScreenConverter {
ActualWidth = width,
ActualHeight = height,
PanScreenPosition = new Vector2D(width / 2, height / 2),
Zoom = 1
};
var canvas = new WindowsCanvas(canvasProxy)
{
DrawingContext = drawingContext
};
var scope = GetScopeWithDrawObjects(drawObjects, width, height);
canvasProxy.Zoom = scope.Zoom;
canvasProxy.PanScreenPosition = scope.PanScreenPosition;
//绘制背景;
if (exportImgSetting.Background != null)
{
drawingContext.DrawRectangle(BrushAdapter.ConvertToSystemBrush(exportImgSetting.Background), null, new Rect(new System.Windows.Size(width, height)));
}
//绘制绘制对象;
foreach (var drawObject in drawObjects.Where(p => exportImgSetting.ExportUnvisible || p.IsVisible))
{
drawObject.Draw(canvas, canvasProxy);
}
drawingContext.Close();
renderTargetBitMap.Render(drawingVisual);
var encoder = new PngBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(renderTargetBitMap));
encoder.Save(stream);
#if DEBUG
//if (stream.Length > 0)
//{
// using (var fs = File.Create($"D://Random/{Guid.NewGuid().ToString("P")}.png"))
// {
// stream.Position = 0;
// stream.CopyTo(fs);
// }
//}
#endif
}
