在Picturebox和高亮区域中打印图像

Question

我正在使用WinForms。在我的表格中，我有一个包含图像的图片框。我提供了我的代码，通过右键单击并拖动鼠标来突出显示图像。

如何打印图像和我在图片框中突出显示的内容？

private Random _rnd = new Random(); 
    private Point _pt; 
    private Point _pt2; 

    private void pictureBox1_MouseDown(object sender, MouseEventArgs e) 
    { 
     //set the upper left point of our selection rectangle 
     if (e.Button == MouseButtons.Left) 
      _pt = e.Location; 
    } 

    private void pictureBox1_MouseUp(object sender, MouseEventArgs e) 
    { 
     //display the selected part when mouse button gets released 
     if (e.Button == MouseButtons.Left) 
     { 
      GenerateBmp(); 
     } 
    } 

    private void pictureBox1_Paint(object sender, PaintEventArgs e) 
    { 
     //if we have a valid rectangle, draw it 
     if (_pt.X - _pt2.X != 0 && _pt.Y - _pt2.Y != 0) 
     { 
      //fill 
      using (SolidBrush sb = new SolidBrush(Color.FromArgb(95, 255, 255, 0))) 
       e.Graphics.FillRectangle(sb, new Rectangle(_pt.X, _pt.Y, _pt2.X - _pt.X, _pt2.Y - _pt.Y)); 
      //draw 
      e.Graphics.DrawRectangle(Pens.Blue, new Rectangle(_pt.X, _pt.Y, _pt2.X - _pt.X, _pt2.Y - _pt.Y)); 

     } 
    } 

    private void pictureBox1_MouseMove(object sender, MouseEventArgs e) 
    { 
     //set the bottom right one 
     if (e.Button == MouseButtons.Left) 
     { 
      _pt2 = e.Location; 
      this.pictureBox1.Invalidate(); 
     } 
    } 

    private void GenerateBmp() 
    { 
     //check, if we have a valid rectangle 
     if (_pt2.X - _pt.X > 0 && _pt2.Y - _pt.Y > 0) 
     { 
      //create that rectangle 
      Rectangle r = new Rectangle(_pt.X, _pt.Y, _pt2.X - _pt.X, _pt2.Y - _pt.Y); 

      //create a new Bitmap with the size of the selection-rectangle 
      Bitmap bmp = new Bitmap(r.Width, r.Height); 

      //draw the selectex part of the original image 
      using (Graphics g = Graphics.FromImage(bmp)) 
       g.DrawImage(this.pictureBox1.Image, new Rectangle(0, 0, r.Width, r.Height), r, GraphicsUnit.Pixel); 
     } 
    } 

    private Bitmap SetUpPictures(PictureBox pb) 
    { 
     //create a bitmap to display 
     Bitmap bmp1 = new Bitmap(pb.ClientSize.Width, pb.ClientSize.Height); 

     //get the graphics-context 
     using (Graphics g = Graphics.FromImage(bmp1)) 
     { 
      //get a random, opaque, color 
      Color c = Color.FromArgb(255, _rnd.Next(256), _rnd.Next(256), _rnd.Next(256)); 
      g.Clear(c); 

      //better smoothinmode for round shapes 
      g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias; 

      //draw ten shapes to the bitmap 
      for (int i = 0; i < 10; i++) 
      { 
       //loaction and size rectangle 
       Rectangle r = new Rectangle(_rnd.Next(pb.ClientSize.Width/2), _rnd.Next(pb.ClientSize.Height/2), 
        _rnd.Next(pb.ClientSize.Width/2), _rnd.Next(pb.ClientSize.Height/2)); 

       //random color 
       Color c2 = Color.FromArgb(_rnd.Next(256), _rnd.Next(256), _rnd.Next(256), _rnd.Next(256)); 

       //one color brush 
       using (SolidBrush sb = new SolidBrush(c2)) 
       { 
        //check, if i is odd or even and decide on that to draw rectangles or ellipses 
        if ((i & 0x01) == 1) 
         g.FillEllipse(sb, r); 
        else 
         g.FillRectangle(sb, r); 
       } 
      } 
     } 

     //return our artwork 
     return bmp1; 
    } 

    private void Btn_Print_Click(object sender, EventArgs e) 
    { 
     System.Drawing.Printing.PrintDocument myPrintDocument1 = new System.Drawing.Printing.PrintDocument(); 
     PrintDialog myPrinDialog1 = new PrintDialog(); 
     myPrintDocument1.PrintPage += new System.Drawing.Printing.PrintPageEventHandler(DVPrintDocument_PrintPage); 
     myPrinDialog1.Document = myPrintDocument1; 

     if (myPrinDialog1.ShowDialog() == DialogResult.OK) 
     { 
      myPrintDocument1.Print(); 
     } 
    } 

    private void DVPrintDocument_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e) 
    { 

     e.Graphics.DrawImage(pictureBox1.Image, 25, 25, 800, 1050); 
     var rc = new RectangleF(0, 0, pictureBox1.Image.Width/100f, pictureBox1.Image.Height/100f); 
     e.Graphics.DrawImage(pictureBox1.Image, rc); 
    } 

Answer 1

你可以简单地使用DrawToBitmap方法来绘制图片框的内容：

例如：

private void pictureBox1_Paint(object sender, PaintEventArgs e) 
{ 
    e.Graphics.DrawRectangle(Pens.Red, new Rectangle(10, 10, 100, 100)); 
} 

private void button1_Click(object sender, EventArgs e) 
{ 
    this.printDocument1.Print(); 
} 

private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e) 
{ 
    var bmp=new Bitmap(this.pictureBox1.Width, this.pictureBox1.Height); 
    this.pictureBox1.DrawToBitmap(bmp,this.pictureBox1.ClientRectangle); 
    e.Graphics.DrawImageUnscaled(bmp, 0, 0); 
} 

这里是打印结果：