如何将文本添加到一个位图图像编程? WPF [英] How to add text to a bitmap image programmatically? WPF
问题描述
我使用Kinect感应器通过设置视频输入作为位图源如下图所示,显示图像的视频饲料。但我的问题是如何将我的文字添加到图像/位图例如比分反超,我添加了以下图片显示我想要达到的。
I'm using a Kinect sensor to show a video feed on an image by setting the video feed as bitmap source like shown below. But my question is how would I add text to the image/bitmap for example a score counter, I added a picture below to show what I'm trying to achieve.
void myKinect_ColorFrameReady(object sender, ColorImageFrameReadyEventArgs e)
{
using (ColorImageFrame colorFrame = e.OpenColorImageFrame())
{
if (colorFrame == null) return;
byte[] colorData = new byte[colorFrame.PixelDataLength];
colorFrame.CopyPixelDataTo(colorData);
KinectVideo.Source = BitmapSource.Create(colorFrame.Width, colorFrame.Height, 96, 96,
PixelFormats.Bgr32, null, colorData, colorFrame.Width * colorFrame.BytesPerPixel);
}
}
推荐答案
您可以通过实现这个 DrawingVisual
和 DrawingImage
类:
You can achieve this using DrawingVisual
and DrawingImage
classes :
var random = new Random();
var pixels = new byte[256 * 256 * 4];
random.NextBytes(pixels);
BitmapSource bitmapSource = BitmapSource.Create(256, 256, 96, 96, PixelFormats.Pbgra32, null, pixels, 256 * 4);
var visual = new DrawingVisual();
using (DrawingContext drawingContext = visual.RenderOpen())
{
drawingContext.DrawImage(bitmapSource, new Rect(0, 0, 256, 256));
drawingContext.DrawText(
new FormattedText("Hi!", CultureInfo.InvariantCulture, FlowDirection.LeftToRight,
new Typeface("Segoe UI"), 32, Brushes.Black), new Point(0, 0));
}
var image = new DrawingImage(visual.Drawing);
Image1.Source = image;
不幸的是,你必须创建一个新的的BitmapSource
,因为目前还没有办法,我知道直接写入文字吧。
Unfortunately you will have to create a new BitmapSource
as there's currently no way I know of writing text directly to it.
另外,您可以使用 WriteableBitmapEx
: HTTPS://writeablebitmapex.$c $ cplex.com /
- 从你的框架使用创建WriteableBitmap的
BitmapFactory
(1) - 创建另一个WriteableBitmap的,并使用上面的方法就可以绘制文本(2)
- blit的文本位图(2)在你的框架(1)
同样的结果,但不同的方法,不能确定是否方法2是更好,因为它的繁琐。
Same result but different approach, not sure whether approach 2 is better as it's cumbersome.
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