Csharp/C Sharp/2D Graphics/Image

Center an Image (VerticalResolution, HorizontalResolution)

 

using System;
using System.Drawing;
using System.Windows.Forms;
   
class CenterImage: Form
{
     Image image = Image.FromFile("Color.jpg");
   
     public static void Main()
     {
          Application.Run(new CenterImage());
     }
     public CenterImage()
     {
          ResizeRedraw = true; 
     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          DoPage(pea.Graphics, ForeColor,ClientSize.Width, ClientSize.Height);
     }     
     protected void DoPage(Graphics grfx, Color clr, int cx, int cy)
     {
          grfx.PageUnit = GraphicsUnit.Pixel;
          grfx.PageScale = 1;
   
          RectangleF rectf = grfx.VisibleClipBounds;
   
          float cxImage = grfx.DpiX * image.Width / 
                                             image.HorizontalResolution;
          float cyImage = grfx.DpiY * image.Height / 
                                             image.VerticalResolution;
   
          grfx.DrawImage(image, (rectf.Width  - cxImage) / 2, 
                                (rectf.Height - cyImage) / 2);
     }
}

Center Pixel-Size Image by using Image.Width and Image.Height

 
using System;
using System.Drawing;
using System.Windows.Forms;
   
class CenterPixelSizeImage: Form
{
     Image image = Image.FromFile("Color.jpg");
   
     public static void Main()
     {
          Application.Run(new CenterPixelSizeImage());
     }
     public CenterPixelSizeImage()
     {
          ResizeRedraw = true; 
     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          DoPage(pea.Graphics, ForeColor,ClientSize.Width, ClientSize.Height);
     }     
     protected void DoPage(Graphics grfx, Color clr, int cx, int cy)
     {
          grfx.DrawImage(image, (cx - image.Width)  / 2,
                                (cy - image.Height) / 2,
                                image.Width, image.Height);
     }
}

Clone Image

  using System;
  using System.Drawing;
  using System.Drawing.Drawing2D;
  using System.Collections;
  using System.ruponentModel;
  using System.Windows.Forms;
  using System.Data;
  using System.Drawing.Imaging;
  public class Form1 : System.Windows.Forms.Form
  {
    public Form1()
    {
      InitializeComponent();
    }
    private void InitializeComponent()
    {
      this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
      this.ClientSize = new System.Drawing.Size(292, 273);
      this.Text = "";
      this.Resize += new System.EventHandler(this.Form1_Resize);
      this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);
    }
    static void Main() 
    {
      Application.Run(new Form1());
    }
    private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
    {      
      Graphics g = e.Graphics;
      Bitmap bmp = new Bitmap("winter.jpg");
      g.FillRectangle(Brushes.White, this.ClientRectangle);
      Rectangle r = new Rectangle(120, 120, 400, 400);
      Bitmap bmp2 = bmp.Clone(r, System.Drawing.Imaging.PixelFormat.DontCare);
      g.DrawImage(bmp, new Rectangle(0, 0, 200, 200));
      g.DrawImage(bmp2, new Rectangle(210, 0, 200, 200));
      bmp2.Dispose();
    }
    private void Form1_Resize(object sender, System.EventArgs e)
    {
      Invalidate();
    }
  }

Draw image based on its size

  using System;
  using System.Drawing;
  using System.Drawing.Drawing2D;
  using System.Collections;
  using System.ruponentModel;
  using System.Windows.Forms;
  using System.Data;
  using System.Drawing.Imaging;
  public class Form1 : System.Windows.Forms.Form
  {
    public Form1()
    {
      InitializeComponent();
    }
    private void InitializeComponent()
    {
      this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
      this.ClientSize = new System.Drawing.Size(292, 273);
      this.Text = "";
      this.Resize += new System.EventHandler(this.Form1_Resize);
      this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);
    }
    static void Main() 
    {
      Application.Run(new Form1());
    }
    private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
    {      
      Graphics g = e.Graphics;
      Bitmap bmp = new Bitmap("winter.jpg");
      Rectangle r = new Rectangle(0, 0, bmp.Width, bmp.Height);
      g.DrawImage(bmp, r, r, GraphicsUnit.Pixel);
    }
    private void Form1_Resize(object sender, System.EventArgs e)
    {
      Invalidate();
    }
  }

Draw on Pixel-Size Image

 
using System;
using System.Drawing;
using System.Windows.Forms;
   
class DrawOnPixelSizeImage: Form
{
     Image  image = Image.FromFile("Color.jpg");
     string str = "www.nfex.ru";
   
     public static void Main()
     {
          Application.Run(new DrawOnPixelSizeImage());
     }
     public DrawOnPixelSizeImage()
     {
          ResizeRedraw = true;
          
          Graphics grfxImage  = Graphics.FromImage(image);
          Graphics grfxScreen = CreateGraphics();
   
          Font font = new Font(Font.FontFamily, grfxScreen.DpiY / grfxImage.DpiY * Font.SizeInPoints);
   
          SizeF sizef = grfxImage.MeasureString(str, font);
   
          grfxImage.DrawString(str, font, Brushes.White, image.Width - sizef.Width, 0);
          grfxImage.Dispose();
          grfxScreen.Dispose();
     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          DoPage(pea.Graphics, ForeColor,ClientSize.Width, ClientSize.Height);
     }   
     protected void DoPage(Graphics grfx, Color clr, int cx, int cy)
     {
          grfx.DrawImage(image, 0, 0, image.Width, image.Height);
          grfx.DrawString(str, Font, new SolidBrush(clr), image.Width, 0);
     }
}

Draw Partial Image

 

using System;
using System.Drawing;
using System.Windows.Forms;
   
class PartialImage: Form
{
     Image image = Image.FromFile("Color.jpg");
   
     public static void Main()
     {
          Application.Run(new PartialImage());
     }
     public PartialImage()
     {
          ResizeRedraw = true; 
     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          DoPage(pea.Graphics, ForeColor,ClientSize.Width, ClientSize.Height);
     }      
     protected void DoPage(Graphics grfx, Color clr, int cx, int cy)
     {
          Rectangle rect = new Rectangle(95, 5, 50, 55);
   
          grfx.DrawImage(image, 0, 0, rect, GraphicsUnit.Pixel);
     }
}

Draw text on an Image

 
using System;
using System.Drawing;
using System.Windows.Forms;
   
class DrawOnImage: Form
{
     Image  image = Image.FromFile("Color.jpg");
     string str = "www.nfex.ru";
   
     public static void Main()
     {
          Application.Run(new DrawOnImage());
     }
     public DrawOnImage()
     {
          ResizeRedraw = true; 
          Graphics grfxImage = Graphics.FromImage(image);
   
          grfxImage.PageUnit = GraphicsUnit.Inch;
          grfxImage.PageScale = 1;
   
          SizeF sizef = grfxImage.MeasureString(str, Font);
   
          grfxImage.DrawString(str, Font, Brushes.White, grfxImage.VisibleClipBounds.Width - sizef.Width, 0);
   
          grfxImage.Dispose();
     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          DoPage(pea.Graphics, ForeColor,ClientSize.Width, ClientSize.Height);
     }       
     protected void DoPage(Graphics grfx, Color clr, int cx, int cy)
     {
          grfx.PageUnit = GraphicsUnit.Pixel;
          grfx.DrawImage(image, 0, 0);
          grfx.DrawString(str, Font, new SolidBrush(clr),
                    grfx.DpiX * image.Width / image.HorizontalResolution, 0);
     }
}

Fill Ellipse with image based Texture Brush

using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
public class Form1 : System.Windows.Forms.Form{
   private System.ruponentModel.Container components = null;
   private Image theImage;
   private Image smallImage;
   public Form1() {
      InitializeComponent();
      SetStyle(ControlStyles.Opaque, true);
      theImage = new Bitmap("Winter.jpg");
      smallImage = new Bitmap(theImage,new Size(theImage.Width / 2, theImage.Height / 2));
   }
    protected override void OnPaint(PaintEventArgs e){
       Graphics g = e.Graphics;
       g.FillRectangle(Brushes.White, ClientRectangle);
       Brush tBrush = new TextureBrush(smallImage, new Rectangle(0, 0,smallImage.Width, smallImage.Height));
       g.FillEllipse(tBrush, ClientRectangle);
       tBrush.Dispose();
    }
     private void InitializeComponent() {
        this.ruponents = new System.ruponentModel.Container();
        this.Size = new System.Drawing.Size(300,300);
        this.Text = "Form1";
     }
     static void Main() {
         Application.Run(new Form1());
     }
}

Get Image Resolution and Image size and Display size

  using System;
  using System.Drawing;
  using System.Drawing.Drawing2D;
  using System.Collections;
  using System.ruponentModel;
  using System.Windows.Forms;
  using System.Data;
  using System.Drawing.Imaging;
  public class Form1 : System.Windows.Forms.Form
  {
    public Form1()
    {
      InitializeComponent();
    }
    private void InitializeComponent()
    {
      this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
      this.ClientSize = new System.Drawing.Size(292, 273);
      this.Text = "";
      this.Resize += new System.EventHandler(this.Form1_Resize);
      this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);
    }
    static void Main() 
    {
      Application.Run(new Form1());
    }
    private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
    {      
      Graphics g = e.Graphics;
      Bitmap bmp = new Bitmap("winter.jpg");
      g.DrawImage(bmp, 0, 0);
      Console.WriteLine("Screen resolution: " + g.DpiX + "DPI");
      Console.WriteLine("Image resolution: " + bmp.HorizontalResolution + "DPI");
      Console.WriteLine("Image Width: " + bmp.Width);
      Console.WriteLine("Image Height: " + bmp.Height);
      SizeF s = new SizeF(bmp.Width * (g.DpiX / bmp.HorizontalResolution),
                bmp.Height * (g.DpiY / bmp.VerticalResolution));
      Console.WriteLine("Display size of image: " + s);
    }
    private void Form1_Resize(object sender, System.EventArgs e)
    {
      Invalidate();
    }
  }

Image At Points (Draw part of the image)

 
using System;
using System.Drawing;
using System.Windows.Forms;
   
class ImageAtPoints: Form
{
     Image image = Image.FromFile("Color.jpg");
   
     public static void Main()
     {
          Application.Run(new ImageAtPoints());
     }
     public ImageAtPoints()
     {
          ResizeRedraw = true;
     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          DoPage(pea.Graphics, ForeColor,ClientSize.Width, ClientSize.Height);
     }        
     protected void DoPage(Graphics grfx, Color clr, int cx, int cy)
     {
          grfx.DrawImage(image, new Point[] { new Point(cx / 2, 0),
                                              new Point(cx,     cy / 2),
                                              new Point(0,      cy / 2)});
               
        
     }
}

Image Flipping and Rotating

 
using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
public class Form1 : System.Windows.Forms.Form {
    private System.Windows.Forms.GroupBox groupBox1;
    private System.Windows.Forms.CheckBox checkBox1;
    private System.Windows.Forms.RadioButton radioButton1;
    Image im = null;
    Image im2 = null;
    private System.Windows.Forms.Label label1;
    private System.Windows.Forms.RadioButton radioButton2;
    private System.Windows.Forms.RadioButton radioButton3;
    public Form1() {
        this.groupBox1 = new System.Windows.Forms.GroupBox();
        this.radioButton1 = new System.Windows.Forms.RadioButton();
        this.checkBox1 = new System.Windows.Forms.CheckBox();
        this.label1 = new System.Windows.Forms.Label();
        this.radioButton2 = new System.Windows.Forms.RadioButton();
        this.radioButton3 = new System.Windows.Forms.RadioButton();
        this.groupBox1.SuspendLayout();
        this.SuspendLayout();
        this.groupBox1.Controls.AddRange(new System.Windows.Forms.Control[] {
                                          this.radioButton3,
                                          this.radioButton2,
                                          this.radioButton1,
                                          this.checkBox1});
        this.groupBox1.Location = new System.Drawing.Point(312, 64);
        this.groupBox1.Size = new System.Drawing.Size(248, 80);
        this.radioButton1.Location = new System.Drawing.Point(120, 16);
        this.radioButton1.Size = new System.Drawing.Size(112, 24);
        this.checkBox1.Location = new System.Drawing.Point(16, 16);
        this.checkBox1.CheckedChanged += new System.EventHandler(this.checkBox1_CheckedChanged);
        this.label1.Location = new System.Drawing.Point(8, 8);
        this.label1.Size = new System.Drawing.Size(304, 200);
        this.radioButton2.Location = new System.Drawing.Point(16, 48);
        this.radioButton3.Location = new System.Drawing.Point(120, 48);
        this.radioButton3.Size = new System.Drawing.Size(120, 24);
        this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
        this.ClientSize = new System.Drawing.Size(560, 214);
        this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                      this.label1,
                                      this.groupBox1});
        this.groupBox1.ResumeLayout(false);
        this.ResumeLayout(false);
        this.radioButton1.Checked = false;
        this.label1.Text = "";
        this.groupBox1.Text = "RotateFlipType";
        this.checkBox1.Text = "Paint";
        this.radioButton1.Text = "Rotate180FlipY";
        this.radioButton2.Text = "Rotate180FlipX";
        this.radioButton3.Text = "Rotate180FlipNone";
        this.radioButton1.CheckedChanged += new System.EventHandler(this.radioButtons_CheckedChanged);
        this.radioButton2.CheckedChanged += new System.EventHandler(this.radioButtons_CheckedChanged);
        this.radioButton3.CheckedChanged += new System.EventHandler(this.radioButtons_CheckedChanged);

    }
    [STAThread]
    static void Main() {
        Application.Run(new Form1());
    }
    protected override void OnPaint(PaintEventArgs e) { RotateFlip(); }
    private void label1_Paint(object sender, System.Windows.Forms.PaintEventArgs e) { RotateFlip(); }
    private void checkBox1_CheckedChanged(object sender, System.EventArgs e) { RotateFlip(); }
    private void radioButtons_CheckedChanged(object sender, System.EventArgs e) { RotateFlip(); }
    protected void RotateFlip() {
        Graphics g = Graphics.FromHwnd(this.label1.Handle);
        Brush b = new SolidBrush(this.label1.BackColor);
        if (this.checkBox1.Checked) {
            if (im == null) ReadImage();
            Graphics g2 = Graphics.FromImage(im); 
            FontFamily ff = new FontFamily("Times New Roman");
            Font f = new Font(ff, 25, FontStyle.Bold);
            g2.DrawString("HIMALAYA", f, new SolidBrush(Color.Yellow), 170, 210);
            g2.Dispose();
            im2 = (Image)im.Clone();
            int w2 = label1.Width / 2, h2 = label1.Height / 2;
            g.DrawImage(im, 0, 0, w2, h2);
            if (this.radioButton1.Checked){
                im2.RotateFlip(RotateFlipType.Rotate180FlipY);
                g.DrawImage(im2, w2, 0, w2, h2);
            } else 
                g.FillRectangle(b, w2, 0, w2, h2);
            if (this.radioButton2.Checked) {
                im2.RotateFlip(RotateFlipType.Rotate180FlipX);
                g.DrawImage(im2, 0, h2, w2, h2);
            } else 
                g.FillRectangle(b, 0, h2, w2, h2);
            if (this.radioButton3.Checked) {
                im2.RotateFlip(RotateFlipType.Rotate180FlipNone);
                g.DrawImage(im2, w2, h2, w2, h2);
            } else 
                g.FillRectangle(b, w2, h2, w2, h2);
            im2.Dispose();
        } else Clear(g);
        b.Dispose(); g.Dispose();
    }
    protected void ReadImage() {
        string path = "a.bmp";
        im = Image.FromFile(path);
        this.radioButton1.Enabled = true;
        this.radioButton2.Enabled = true;
        this.radioButton3.Enabled = true;
    }
    protected void Clear(Graphics g) {
        g.Clear(this.BackColor);
        g.Dispose();
        im = null;
        im2 = null;
        this.radioButton1.Checked = false;
        this.radioButton2.Checked = false;
        this.radioButton3.Checked = false;
        this.radioButton1.Enabled = false;
        this.radioButton2.Enabled = false;
        this.radioButton3.Enabled = false;
    }
}

Image.FromStream: load image from stream

 
using System;
using System.Net;
using System.IO;
using System.Drawing;
using System.Windows.Forms;
public class MainClass {
    public static void Main() {
        WebRequest requestPic = WebRequest.Create("http://www.your.ru/1.jpg");
        WebRequest requestHtml = WebRequest.Create("http://www.your.ru");
        WebResponse responsePic = requestPic.GetResponse();
        WebResponse responseHtml = requestHtml.GetResponse();
        Image img = Image.FromStream(responsePic.GetResponseStream());
        using (StreamReader r = new StreamReader(responseHtml.GetResponseStream())) {
            Console.WriteLine(r.ReadToEnd());
        }
    }
}

Image.GetThumbnailImage

 
using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
using System.Net;
using System.IO;
public class Form1 : System.Windows.Forms.Form {
    [STAThread]
    static void Main() {
        Application.Run(new Form1());
    }
    protected override void OnPaint(System.Windows.Forms.PaintEventArgs e) {
        string p = "s.JPG";
        Image i = Image.FromFile(p);
        Image tn = i.GetThumbnailImage(50, 50, null, IntPtr.Zero);  // <=>(IntPtr)0
        e.Graphics.DrawImage(tn, 100, 0, tn.Width, tn.Height);
        e.Graphics.Dispose();
    }
}

Image Open

 
using System;
using System.Drawing;
using System.IO;
using System.Windows.Forms;
   
class ImageOpen: Form
{
     protected string strProgName;
     protected string strFileName;
     protected Image  image;
   
     public static void Main()
     {
          Application.Run(new ImageOpen());
     }
     public ImageOpen()
     {
          ResizeRedraw = true;
   
          Menu = new MainMenu();
          Menu.MenuItems.Add("&File");
          Menu.MenuItems[0].MenuItems.Add(new MenuItem("&Open...", 
                                   new EventHandler(MenuFileOpenOnClick),
                                   Shortcut.CtrlO));
     }
     void MenuFileOpenOnClick(object obj, EventArgs ea)
     {
          OpenFileDialog dlg = new OpenFileDialog();
   
          dlg.Filter = "All Image Files|*.bmp;*.ico;*.gif;*.jpeg;*.jpg;" +
                              "*.jfif;*.png;*.tif;*.tiff;*.wmf;*.emf|" +
                       "Windows Bitmap (*.bmp)|*.bmp|" +
                       "Windows Icon (*.ico)|*.ico|" +
                       "Graphics Interchange Format (*.gif)|*.gif|" +
                       "JPEG File Interchange Format (*.jpg)|" +
                              "*.jpg;*.jpeg;*.jfif|" +
                       "Portable Network Graphics (*.png)|*.png|" +
                       "Tag Image File Format (*.tif)|*.tif;*.tiff|" +
                       "Windows Metafile (*.wmf)|*.wmf|" +
                       "Enhanced Metafile (*.emf)|*.emf|" +
                       "All Files (*.*)|*.*";
   
          if (dlg.ShowDialog() == DialogResult.OK)
          {    
   
               try
               {
                    image = Image.FromFile(dlg.FileName);
               }
               catch (Exception exc)
               {
                    Console.WriteLine(exc.Message);
                    return;
               }
               strFileName = dlg.FileName;
               Text = Path.GetFileName(strFileName);
               Invalidate();
          }
     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          Graphics grfx = pea.Graphics;
   
          if (image != null)
               grfx.DrawImage(image, 0, 0);
     }
}

Image Reflection

 
using System;
using System.Drawing;
using System.Windows.Forms;
   
class ImageReflection: Form
{
     Image image = Image.FromFile("Color.jpg");
   
     public static void Main()
     {
          Application.Run(new ImageReflection());
     }
     public ImageReflection()
     {
          ResizeRedraw = true;
          
     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          DoPage(pea.Graphics, ForeColor,ClientSize.Width, ClientSize.Height);
     }     
     protected void DoPage(Graphics grfx, Color clr, int cx, int cy)
     {
          int cxImage = image.Width;
          int cyImage = image.Height;
   
          grfx.DrawImage(image, cx / 2, cy / 2,  cxImage,  cyImage);
          grfx.DrawImage(image, cx / 2, cy / 2, -cxImage,  cyImage);
          grfx.DrawImage(image, cx / 2, cy / 2,  cxImage, -cyImage);
          grfx.DrawImage(image, cx / 2, cy / 2, -cxImage, -cyImage);
     }
}

Image Save

 
using System;
using System.Drawing;
using System.IO;
using System.Windows.Forms;
   
class ImageOpen: Form
{
     protected string strProgName;
     protected string strFileName;
     protected Image  image;
     MenuItem miSaveAs;
     public static void Main()
     {
          Application.Run(new ImageOpen());
     }
     public ImageOpen()
     {
          ResizeRedraw = true;
   
          Menu = new MainMenu();
          Menu.MenuItems.Add("&File");
          Menu.MenuItems[0].MenuItems.Add(new MenuItem("&Open...", 
                                   new EventHandler(MenuFileOpenOnClick),
                                   Shortcut.CtrlO));
          Menu.MenuItems[0].Popup += new EventHandler(MenuFileOnPopup);
          miSaveAs = new MenuItem("Save &As...");
          miSaveAs.Click += new EventHandler(MenuFileSaveAsOnClick);
          Menu.MenuItems[0].MenuItems.Add(miSaveAs);
     }
     void MenuFileOnPopup(object obj, EventArgs ea)
     {
          miSaveAs.Enabled = (image != null);
     }
     void MenuFileSaveAsOnClick(object obj, EventArgs ea)
     {
          SaveFileDialog savedlg = new SaveFileDialog();
   
          savedlg.InitialDirectory = Path.GetDirectoryName(strFileName);
          savedlg.FileName = Path.GetFileNameWithoutExtension(strFileName);
          savedlg.AddExtension = true;
          savedlg.Filter = "Windows Bitmap (*.bmp)|*.bmp|" +
                           "Graphics Interchange Format (*.gif)|*.gif|" +
                           "JPEG File Interchange Format (*.jpg)|" +
                              "*.jpg;*.jpeg;*.jfif|" +
                           "Portable Network Graphics (*.png)|*.png|" +
                           "Tagged Imaged File Format (*.tif)|*.tif;*.tiff";
   
          if (savedlg.ShowDialog() == DialogResult.OK)
          {
               try
               {
                    image.Save(savedlg.FileName);
               }
               catch (Exception exc)
               {
                    MessageBox.Show(exc.Message, Text);
                    return;
               }
               strFileName = savedlg.FileName;
               Text = strProgName + " - " + Path.GetFileName(strFileName);
          }
     }
     void MenuFileOpenOnClick(object obj, EventArgs ea)
     {
          OpenFileDialog dlg = new OpenFileDialog();
   
          dlg.Filter = "All Image Files|*.bmp;*.ico;*.gif;*.jpeg;*.jpg;" +
                              "*.jfif;*.png;*.tif;*.tiff;*.wmf;*.emf|" +
                       "Windows Bitmap (*.bmp)|*.bmp|" +
                       "Windows Icon (*.ico)|*.ico|" +
                       "Graphics Interchange Format (*.gif)|*.gif|" +
                       "JPEG File Interchange Format (*.jpg)|" +
                              "*.jpg;*.jpeg;*.jfif|" +
                       "Portable Network Graphics (*.png)|*.png|" +
                       "Tag Image File Format (*.tif)|*.tif;*.tiff|" +
                       "Windows Metafile (*.wmf)|*.wmf|" +
                       "Enhanced Metafile (*.emf)|*.emf|" +
                       "All Files (*.*)|*.*";
   
          if (dlg.ShowDialog() == DialogResult.OK)
          {    
   
               try
               {
                    image = Image.FromFile(dlg.FileName);
               }
               catch (Exception exc)
               {
                    Console.WriteLine(exc.Message);
                    return;
               }
               strFileName = dlg.FileName;
               Text = Path.GetFileName(strFileName);
               Invalidate();
          }
     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          Graphics grfx = pea.Graphics;
   
          if (image != null)
               grfx.DrawImage(image, 0, 0);
     }
     
}

Image Scale Isotropic

 
using System;
using System.Drawing;
using System.Windows.Forms;
   
class ImageScaleIsotropic: Form
{
     Image image = Image.FromFile("Color.jpg");
   
     public static void Main()
     {
          Application.Run(new ImageScaleIsotropic());
     }
     public ImageScaleIsotropic()
     {
          ResizeRedraw = true; 
     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          DoPage(pea.Graphics, ForeColor,ClientSize.Width, ClientSize.Height);
     }     
     protected void DoPage(Graphics grfx, Color clr, int cx, int cy)
     {
          Rectangle rect = new Rectangle(0, 0, cx, cy);
     
          SizeF sizef = new SizeF(image.Width / image.HorizontalResolution,
                                  image.Height / image.VerticalResolution);
   
          float fScale = Math.Min(rect.Width  / sizef.Width,
                                  rect.Height / sizef.Height);
   
          sizef.Width  *= fScale;
          sizef.Height *= fScale;
          
          grfx.DrawImage(image, rect.X + (rect.Width  - sizef.Width ) / 2,
                                rect.Y + (rect.Height - sizef.Height) / 2,
                                sizef.Width, sizef.Height);
     }
}

Image Scale To Rectangle

 
using System;
using System.Drawing;
using System.Windows.Forms;
   
class ImageScaleToRectangle: Form
{
     Image image = Image.FromFile("Color.jpg");
   
     public static void Main()
     {
          Application.Run(new ImageScaleToRectangle());
     }
     public ImageScaleToRectangle()
     {
          ResizeRedraw = true; 
     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          DoPage(pea.Graphics, ForeColor,ClientSize.Width, ClientSize.Height);
     }     
     protected void DoPage(Graphics grfx, Color clr, int cx, int cy)
     {
          grfx.DrawImage(image, 0, 0, cx, cy);
     }
}

Image Zoom

 
using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
public class Form1 : System.Windows.Forms.Form {
    private System.Windows.Forms.Label label1= new System.Windows.Forms.Label();
    private System.Windows.Forms.GroupBox groupBox1= new System.Windows.Forms.GroupBox();
    private System.Windows.Forms.RadioButton radioButton1= new System.Windows.Forms.RadioButton();
    private System.Windows.Forms.RadioButton radioButton2= new System.Windows.Forms.RadioButton();
    private System.Windows.Forms.RadioButton radioButton3= new System.Windows.Forms.RadioButton();
    private System.Windows.Forms.RadioButton radioButton4= new System.Windows.Forms.RadioButton();
    private System.Windows.Forms.Label label2= new System.Windows.Forms.Label();
    private System.Windows.Forms.CheckBox checkBox1= new System.Windows.Forms.CheckBox();
    Image im = null;
    Image im2 = null;
    public Form1() {
        this.groupBox1.SuspendLayout();
        this.SuspendLayout();
        this.label1.Location = new System.Drawing.Point(8, 16);
        this.label1.Size = new System.Drawing.Size(200, 240);
        this.groupBox1.Controls.AddRange(new System.Windows.Forms.Control[] {
                                          this.checkBox1,
                                          this.radioButton1,
                                          this.radioButton2,
                                          this.radioButton3,
                                          this.radioButton4});
        this.groupBox1.Location = new System.Drawing.Point(232, 48);
        this.groupBox1.Size = new System.Drawing.Size(72, 128);
        this.checkBox1.Location = new System.Drawing.Point(8, 32);
        this.checkBox1.Size = new System.Drawing.Size(56, 24);
        this.checkBox1.CheckedChanged += new System.EventHandler(this.checkBox1_CheckedChanged);
        this.radioButton1.Location = new System.Drawing.Point(8, 64);
        this.radioButton1.Size = new System.Drawing.Size(16, 24);
        this.radioButton2.Location = new System.Drawing.Point(40, 64);
        this.radioButton2.Size = new System.Drawing.Size(16, 24);
        this.radioButton3.Location = new System.Drawing.Point(8, 96);
        this.radioButton3.Size = new System.Drawing.Size(16, 24);
        this.radioButton4.Location = new System.Drawing.Point(40, 96);
        this.radioButton4.Size = new System.Drawing.Size(16, 24);
        this.label2.Location = new System.Drawing.Point(328, 16);
        this.label2.Size = new System.Drawing.Size(200, 240);
        this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
        this.ClientSize = new System.Drawing.Size(536, 266);
        this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                      this.groupBox1,
                                      this.label1,
                                      this.label2});
        this.groupBox1.ResumeLayout(false);
        this.ResumeLayout(false);
        this.Text = "Zooming";
        this.label1.Text = "";
        this.groupBox1.Text = "Zoom";
        this.checkBox1.Text = "Paint";
        this.radioButton1.Checked = false;
        this.radioButton1.CheckedChanged += new System.EventHandler(this.radioButtons_CheckedChanged);
        this.radioButton2.CheckedChanged += new System.EventHandler(this.radioButtons_CheckedChanged);
        this.radioButton3.CheckedChanged += new System.EventHandler(this.radioButtons_CheckedChanged);
        this.radioButton4.CheckedChanged += new System.EventHandler(this.radioButtons_CheckedChanged);
    }
    [STAThread]
    static void Main() {
        Application.Run(new Form1());
    }
    protected override void OnPaint(PaintEventArgs e) { ImageZoom(); }
    private void checkBox1_CheckedChanged(object sender, System.EventArgs e) { ImageZoom(); }
    private void radioButtons_CheckedChanged(object sender, System.EventArgs e) { ImageZoom(); }
    protected void ImageZoom() {
        Graphics g1 = Graphics.FromHwnd(this.label1.Handle);
        Graphics g2 = Graphics.FromHwnd(this.label2.Handle);
        Rectangle rec;
        Rectangle recPart;
        if (this.checkBox1.Checked) {
            if (im == null) ReadImage();
            rec = new Rectangle(0, 0, label1.Width, label1.Height);
            g1.DrawImage(im, rec);
            recPart = new Rectangle(im.Width / 4, im.Height / 4, im.Width / 2, im.Height / 2);
            if (this.radioButton1.Checked)
                recPart = new Rectangle(0, 0, im.Width / 2, im.Height / 2);
            if (this.radioButton2.Checked)
                recPart = new Rectangle(im.Width / 2, 0, im.Width / 2, im.Height / 2);
            if (this.radioButton3.Checked)
                recPart = new Rectangle(0, im.Height / 2, im.Width / 2, im.Height / 2);
            if (this.radioButton4.Checked)
                recPart = new Rectangle(im.Width / 2, im.Height / 2, im.Width / 2, im.Height / 2);
            g2.DrawImage(im, rec, recPart, GraphicsUnit.Pixel);
        } else {
            Clear(g1);
            Clear(g2);
        }
        g1.Dispose(); g2.Dispose();
    }
    protected void ReadImage() {
        string path = "3.BMP";
        im = Image.FromFile(path);
        this.radioButton1.Enabled = true;
        this.radioButton2.Enabled = true;
        this.radioButton3.Enabled = true;
        this.radioButton4.Enabled = true;
    }
    protected void Clear(Graphics g) {
        g.Clear(this.BackColor);
        g.Dispose();
        im = null;
        im2 = null;
        this.radioButton1.Checked = false;
        this.radioButton2.Checked = false;
        this.radioButton3.Checked = false;
        this.radioButton4.Checked = false;
        this.radioButton1.Enabled = false;
        this.radioButton2.Enabled = false;
        this.radioButton3.Enabled = false;
        this.radioButton4.Enabled = false;
    }
}

Load image and display

using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
public class Form1 : System.Windows.Forms.Form{
   private System.ruponentModel.Container components = null;
   private Image theImage;
   public Form1() {
      InitializeComponent();
      SetStyle(ControlStyles.Opaque, true);
      theImage = new Bitmap("Winter.jpg");
   }
   protected override void OnPaint(PaintEventArgs e){
      Graphics g = e.Graphics;
      g.DrawImage(theImage, ClientRectangle);
   }

     private void InitializeComponent() {
        this.ruponents = new System.ruponentModel.Container();
        this.Size = new System.Drawing.Size(300,300);
        this.Text = "Form1";
     }
     static void Main() {
         Application.Run(new Form1());
     }
}

Load Image from an image file with Exception handler

 

using System;
using System.Drawing;
using System.Windows.Forms;
   
class BetterImageFromFile:Form
{
     Image image;
   
     public static void Main()
     {
          Application.Run(new BetterImageFromFile());
          
     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          DoPage(pea.Graphics, ForeColor,ClientSize.Width, ClientSize.Height);
     }     
     public BetterImageFromFile()
     {
          string strFileName = "Color.jpg";
          ResizeRedraw = true; 
          try
          {
               image = Image.FromFile(strFileName);
          }catch {
               MessageBox.Show("Cannot find file " + strFileName + "!",
                         Text, MessageBoxButtons.OK, MessageBoxIcon.Hand);
          }
     }
     protected void DoPage(Graphics grfx, Color clr, int cx, int cy)
     {
          if (image == null)
               return;
   
          grfx.DrawImage(image, 0, 0);
     }
}

Load image from a URL(Web) and draw it

 
using System;
using System.Drawing;
using System.IO;
using System.Net;
using System.Windows.Forms;
   
class ImageFromWeb: Form
{
     Image image;
   
     public static void Main()
     {
          Application.Run(new ImageFromWeb());
     }
     public ImageFromWeb()
     {
          ResizeRedraw = true;
          WebRequest   webreq = WebRequest.Create("http://www.yoursite.ru/1.jpg");
          WebResponse  webres = webreq.GetResponse();
          Stream       stream = webres.GetResponseStream();
   
          image = Image.FromStream(stream);
          stream.Close();
     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          DoPage(pea.Graphics, ForeColor,ClientSize.Width, ClientSize.Height);
     }     
     protected void DoPage(Graphics grfx, Color clr, int cx, int cy)
     {
          grfx.DrawImage(image, 0, 0);
     }
}

Partial Image Rotate

 
using System;
using System.Drawing;
using System.Windows.Forms;
   
class PartialImageRotate: Form
{
     Image image = Image.FromFile("Color.jpg");
   
     public static void Main()
     {
          Application.Run(new PartialImageRotate());
     }
     public PartialImageRotate()
     {
          ResizeRedraw = true; 
     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          DoPage(pea.Graphics, ForeColor,ClientSize.Width, ClientSize.Height);
     }       
     protected void DoPage(Graphics grfx, Color clr, int cx, int cy)
     {
          Point[] aptDst = { new Point(0, cy / 2),
                             new Point(cx / 2, 0),
                             new Point(cx / 2, cy) };
   
          Rectangle rectSrc = new Rectangle(95, 5, 50, 55);
          
          grfx.DrawImage(image, aptDst, rectSrc, GraphicsUnit.Pixel);
     }
}

Partial Image Stretch

 
using System;
using System.Drawing;
using System.Windows.Forms;
   
class PartialImageStretch: Form
{
     Image image = Image.FromFile("Color.jpg");
   
     public static void Main()
     {
          Application.Run(new PartialImageStretch());
     }
     public PartialImageStretch()
     {
          ResizeRedraw = true;
     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          DoPage(pea.Graphics, ForeColor,ClientSize.Width, ClientSize.Height);
     }       
     protected void DoPage(Graphics grfx, Color clr, int cx, int cy)
     {
          Rectangle rectSrc = new Rectangle(95, 5, 50, 55);
          Rectangle rectDst = new Rectangle( 0, 0, cx, cy);
   
          grfx.DrawImage(image, rectDst, rectSrc, GraphicsUnit.Pixel);
     }
}

Scribble with Bitmap

 

using System;
using System.Drawing;
using System.Windows.Forms;
   
class ScribbleWithBitmap: Form
{
     bool     bTracking;
     Point    ptLast;
     Bitmap   bitmap;
     Graphics grfxBm;
   
     public static void Main()
     {
          Application.Run(new ScribbleWithBitmap());
     }
     public ScribbleWithBitmap()
     {
          Size size = SystemInformation.PrimaryMonitorMaximizedWindowSize;
          bitmap = new Bitmap(size.Width, size.Height);
   
          grfxBm = Graphics.FromImage(bitmap);
          grfxBm.Clear(BackColor);
     }
     protected override void OnMouseDown(MouseEventArgs mea)
     {
          if (mea.Button != MouseButtons.Left)
               return;
   
          ptLast = new Point(mea.X, mea.Y);
          bTracking = true;
     }
     protected override void OnMouseMove(MouseEventArgs mea)
     {
          if (!bTracking)
               return;
   
          Point ptNew = new Point(mea.X, mea.Y);
          
          Pen pen = new Pen(ForeColor);
          Graphics grfx = CreateGraphics();
          grfx.DrawLine(pen, ptLast, ptNew);
          grfx.Dispose();
   
          grfxBm.DrawLine(pen, ptLast, ptNew);
   
          ptLast = ptNew;
     }
     protected override void OnMouseUp(MouseEventArgs mea)
     {
          bTracking = false;
     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          Graphics grfx = pea.Graphics;
          grfx.DrawImage(bitmap, 0, 0, bitmap.Width, bitmap.Height);
     }
}

Set image resolution and paint it

  using System;
  using System.Drawing;
  using System.Drawing.Drawing2D;
  using System.Collections;
  using System.ruponentModel;
  using System.Windows.Forms;
  using System.Data;
  using System.Drawing.Imaging;
  public class Form1 : System.Windows.Forms.Form
  {
    public Form1()
    {
      InitializeComponent();
    }
    private void InitializeComponent()
    {
      this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
      this.ClientSize = new System.Drawing.Size(292, 273);
      this.Text = "";
      this.Resize += new System.EventHandler(this.Form1_Resize);
      this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);
    }
    static void Main() 
    {
      Application.Run(new Form1());
    }
    private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
    {      
      Graphics g = e.Graphics;
      Bitmap bmp = new Bitmap("winter.jpg");
      g.FillRectangle(Brushes.White, this.ClientRectangle);
      bmp.SetResolution(600f, 600f);
      g.DrawImage(bmp, 0, 0);
      bmp.SetResolution(1200f, 1200f);
      g.DrawImage(bmp, 180, 0);
    }
    private void Form1_Resize(object sender, System.EventArgs e)
    {
      Invalidate();
    }
  }

Shear Image

  using System;
  using System.Drawing;
  using System.Drawing.Drawing2D;
  using System.Collections;
  using System.ruponentModel;
  using System.Windows.Forms;
  using System.Data;
  using System.Drawing.Imaging;
  public class Form1 : System.Windows.Forms.Form
  {
    public Form1()
    {
      InitializeComponent();
    }
    private void InitializeComponent()
    {
      this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
      this.ClientSize = new System.Drawing.Size(292, 273);
      this.Text = "";
      this.Resize += new System.EventHandler(this.Form1_Resize);
      this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);
    }
    static void Main() 
    {
      Application.Run(new Form1());
    }
    private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
    {      
      Graphics g = e.Graphics;
      Bitmap bmp = new Bitmap("winter.jpg");
      g.FillRectangle(Brushes.White, this.ClientRectangle);
      Point[] destinationPoints = {
        new Point(0, 0),    // destination for upper-left point of original
        new Point(300, 0),  // destination for upper-right point of original
        new Point(100, 300)};// destination for lower-left point of original
      g.DrawImage(bmp, destinationPoints);
    }
    private void Form1_Resize(object sender, System.EventArgs e)
    {
      Invalidate();
    }
  }

Shrink Image

  using System;
  using System.Drawing;
  using System.Drawing.Drawing2D;
  using System.Collections;
  using System.ruponentModel;
  using System.Windows.Forms;
  using System.Data;
  using System.Drawing.Imaging;
  public class Form1 : System.Windows.Forms.Form
  {
    public Form1()
    {
      InitializeComponent();
    }
    private void InitializeComponent()
    {
      this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
      this.ClientSize = new System.Drawing.Size(292, 273);
      this.Text = "";
      this.Resize += new System.EventHandler(this.Form1_Resize);
      this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);
    }
    static void Main() 
    {
      Application.Run(new Form1());
    }
    private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
    {      
      Graphics g = e.Graphics;
      Bitmap bmp = new Bitmap("winter.jpg");
      g.FillRectangle(Brushes.White, this.ClientRectangle);
      Rectangle sr = new Rectangle(80, 60, 400, 400);
      Rectangle dr = new Rectangle(0, 0, 200, 200);
      g.DrawImage(bmp, dr, sr, GraphicsUnit.Pixel);
    }
    private void Form1_Resize(object sender, System.EventArgs e)
    {
      Invalidate();
    }
  }

Thumbnail Image

 
using System;
using System.Drawing;
using System.Windows.Forms;
   
class Thumbnail: Form
{
     const int iSquare = 64;
     Image imageThumbnail;
   
     public static void Main()
     {
          Application.Run(new Thumbnail());
     }
     public Thumbnail()
     {
          Text = "Thumbnail";
          ResizeRedraw = true; 
          Image image = Image.FromFile("Color.jpg");
   
          int cxThumbnail, cyThumbnail;
   
          if (image.Width > image.Height)
          {
               cxThumbnail = iSquare;
               cyThumbnail = iSquare * image.Height / image.Width;
          }
          else
          {
               cyThumbnail = iSquare;
               cxThumbnail = iSquare * image.Width / image.Height;
          }
          imageThumbnail = image.GetThumbnailImage(cxThumbnail, cyThumbnail,
                                                   null, (IntPtr) 0);
     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          DoPage(pea.Graphics, ForeColor,ClientSize.Width, ClientSize.Height);
     }      
     protected void DoPage(Graphics grfx, Color clr, int cx, int cy)
     {
          for (int y = 0; y < cy; y += iSquare){
              for (int x = 0; x < cx; x += iSquare)
                   grfx.DrawImage(imageThumbnail, 
                                  x + (iSquare - imageThumbnail.Width) / 2,
                                  y + (iSquare - imageThumbnail.Height) / 2,
                                  imageThumbnail.Width, imageThumbnail.Height);
          }
     }
}