[英]How can I render text on a WriteableBitmap on a background thread, in Windows Phone 7?
[英]Render text with WriteableBitmap on Canvas
我有自定義的畫布(WPF)面板。 從后面的代碼中,我需要使用WriteableBitmap
(或WriteableBitmapEx
)呈現文本。
我怎樣才能做到這一點?
使用RenderTargetBitmap對象的Render方法有效地捕獲Canvas作為內存流-然后從中創建一個位圖:
var targetBitmap = new RenderTargetBitmap((int)yourCanvas.ActualWidth, (int)yourCanvas.ActualHeight, 96d, 96d, System.Windows.Media.PixelFormats.Default);
targetBitmap.Render(yourCanvas);
// add the RenderTargetBitmap to a Bitmap encoder
var encoder = new BmpBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(targetBitmap));
// create the memory stream
var memoryStream = new MemoryStream();
encoder.Save(memoryStream);
// create the bitmap
var controlBitmap = new System.Drawing.Bitmap(memoryStream);
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