使用紧凑框架中的图形在Image上绘制DrawLines [英] DrawLines over Image using graphics in compact framework

问题描述

我有一个图片框控件，通过使用鼠标按下和鼠标移动事件，我使用点绘制图像并将其存储在我的数据库中。在更新模式下，我正在检索字节并将图像绘制到图片框控件中，现在我在图像上添加了几行，但要么是我新添加的行还是旧图像，但我想要两者

 // rect是我的图片框
位图bmp =新位图（rect.Width，rect.Height ）; 
 //创建兼容的图形
图形gxComp = Graphics.FromImage（bmp）; 
 
 //如果我有图像
 
 System.IO.MemoryStream memStream = new System.IO.MemoryStream（TmpSign）; 
 Bitmap im = new Bitmap（memStream）; 
 

Tmp是我图像的字节数组

 gxComp.DrawLines（pen，_currentStroke.ToArray （））; 
 

_currentStroke是点列表。

解决方案

创建图像和绘图的grahics那个图形对象上的线已经解决了我的问题。

  //  参考上面代码 
  //  创建图像的图形（如果存在） 

 gxcomp = Graphics.FromImage（im） ; 
 

和

  //  将新绘制的点写入图形 

 gxComp.DrawLines（pen，_ currentStroke.ToArray（））; 

I have a picturebox control in which by using mouse down and mouse move events ,I am drawing a image using points and storing it in my database. and in update mode I am retrieving the bytes and drawing an image in to the picture box control and now I am adding few lines more on the image but either I am getting newly added lines or the old image but i want both

//rect is my picture box
   Bitmap bmp = new Bitmap(rect.Width, rect.Height);
           // Create compatible graphics
           Graphics gxComp = Graphics.FromImage(bmp);

//If i have a image

          System.IO.MemoryStream memStream = new System.IO.MemoryStream(TmpSign);
                   Bitmap im = new Bitmap(memStream);

Tmp is my byte array of my image

gxComp.DrawLines(pen, _currentStroke.ToArray());

_currentStroke is the list of points.

解决方案

Creating the grahics of image and drawing lines on to that graphics object has solved my problem.

//Ref with above Code
//Creating the graphics of the image if exists

gxcomp=Graphics.FromImage(im);

and

//writing my new drawn points on to the graphics

gxComp.DrawLines(pen, _currentStroke.ToArray());

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