Csharp/C Sharp by API/System.Drawing/Image

Image.FromFile(String path)

  
/*
Professional Windows GUI Programming Using C#
by Jay Glynn, Csaba Torok, Richard Conway, Wahid Choudhury, 
   Zach Greenvoss, Shripad Kulkarni, Neil Whitlow
Publisher: Peer Information
ISBN: 1861007663
*/
// Change the path(s) if needed. If you have VS.NET write:
// "..\\..\\Altamira5.bmp" or @"..\..\Altamira5.bmp"
// otherwise
// "Altamira5.bmp"
// and compile with:
// csc Altamira.cs
using System;
using System.Drawing;
using System.Windows.Forms;
namespace Altamira
{
public class Altamira1 : Form
{
    Pen p;
    SolidBrush b, bT = new SolidBrush(Color.Black);
    string path = "Altamira5.bmp";  // change the path if needed
    Image im;
    Font f;
    public Altamira1()
    {
        InitializeComponent();
        MyIni();
    }
    private void InitializeComponent()
    {
        this.SuspendLayout();
        this.ClientSize = new System.Drawing.Size(290, 260);
        this.Text = "Altamira";
        this.ResumeLayout(false);
    }
    private void MyIni()
    {
        Color cP = Color.Gray;
        Color cB = Color.LightGray;
        p = new Pen(cP, 6);
        b = new SolidBrush(cB);
        im = Image.FromFile(path);
        f = new Font(new FontFamily("Times New Roman"), 10);
    }
    static void Main() 
    {
        Application.Run(new Altamira1());
    }
    protected override void OnPaint(PaintEventArgs pea)
    {
        Sketch();
        //SketchDBuf();
    }
    private void Sketch()
    {
        Graphics g = Graphics.FromHwnd(this.Handle);  // <=> g = CreateGraphics();
        g.FillRectangle(b, 4, 4, 260, 220);  // passe-partout
        g.DrawRectangle(p, 4, 4, 260, 220);  // frame
        g.DrawImage(im, 33, 35, 200, 145 );  // image
        g.DrawString("ALTAMIRA", f, bT, 180, 190);  // text
        g.Dispose();
    }
    private void SketchDBuf()
    {
        int hh = 3, w = 260, h = 220;   
        Graphics g;
        Bitmap bm = new Bitmap(w + 2*hh, h + 2*hh);
        g = Graphics.FromImage(bm);  // buffer graphics
        g.FillRectangle(b, hh , hh, w, h);  // passe-partout
        g.DrawRectangle(new Pen(Color.Gray,  2*hh), hh, hh, w, h);  // frame
        g.DrawImage(im, hh + 30, hh + 32, 200, 145);  // image
        g.DrawString("ALTAMIRA", f, bT, 180, 190);  // text
        g = Graphics.FromHwnd(this.Handle);  // real graphics
        g.DrawImage(bm, 1, 1);
        g.Dispose();
    }
}
}

Image.FromStream

 
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.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);
          }
     }
}

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);
     }
}

Image.RotateFlip(RotateFlipType.Rotate180FlipY)

  
/*
Professional Windows GUI Programming Using C#
by Jay Glynn, Csaba Torok, Richard Conway, Wahid Choudhury, 
   Zach Greenvoss, Shripad Kulkarni, Neil Whitlow
Publisher: Peer Information
ISBN: 1861007663
*/
using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
namespace ImageFlip
{
    /// <summary>
    /// Summary description for ImageFlip.
    /// </summary>
    public class ImageFlip : 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;
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ruponentModel.Container components = null;
        public ImageFlip()
        {
            //
            // Required for Windows Form Designer support
            //
            InitializeComponent();
            this.Text = "Flipping and Rotating";
            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);
            //
            // TODO: Add any constructor code after InitializeComponent call
            //
        }
        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        protected override void Dispose( bool disposing )
        {
            if( disposing )
            {
                if (components != null) 
                {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }
        #region Windows Form Designer generated code
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            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();
            // 
            // groupBox1
            // 
            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.Name = "groupBox1";
            this.groupBox1.Size = new System.Drawing.Size(248, 80);
            this.groupBox1.TabIndex = 1;
            this.groupBox1.TabStop = false;
            this.groupBox1.Text = "groupBox1";
            // 
            // radioButton1
            // 
            this.radioButton1.Location = new System.Drawing.Point(120, 16);
            this.radioButton1.Name = "radioButton1";
            this.radioButton1.Size = new System.Drawing.Size(112, 24);
            this.radioButton1.TabIndex = 1;
            this.radioButton1.Text = "radioButton1";
            // 
            // checkBox1
            // 
            this.checkBox1.Location = new System.Drawing.Point(16, 16);
            this.checkBox1.Name = "checkBox1";
            this.checkBox1.TabIndex = 0;
            this.checkBox1.Text = "checkBox1";
            this.checkBox1.CheckedChanged += new System.EventHandler(this.checkBox1_CheckedChanged);
            // 
            // label1
            // 
            this.label1.Location = new System.Drawing.Point(8, 8);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(304, 200);
            this.label1.TabIndex = 2;
            this.label1.Text = "label1";
            // 
            // radioButton2
            // 
            this.radioButton2.Location = new System.Drawing.Point(16, 48);
            this.radioButton2.Name = "radioButton2";
            this.radioButton2.TabIndex = 2;
            this.radioButton2.Text = "radioButton2";
            // 
            // radioButton3
            // 
            this.radioButton3.Location = new System.Drawing.Point(120, 48);
            this.radioButton3.Name = "radioButton3";
            this.radioButton3.Size = new System.Drawing.Size(120, 24);
            this.radioButton3.TabIndex = 3;
            this.radioButton3.Text = "radioButton3";
            // 
            // ImageFlip
            // 
            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.Name = "ImageFlip";
            this.Text = "ImageFlip";
            this.groupBox1.ResumeLayout(false);
            this.ResumeLayout(false);
        }
        #endregion
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main() 
        {
            Application.Run(new ImageFlip());
        }
        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);  // For text "Himalaya"
                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)  // Rotate180FlipY
                {
                    im2.RotateFlip(RotateFlipType.Rotate180FlipY);
                    g.DrawImage(im2, w2, 0, w2, h2);
                }
                else g.FillRectangle(b, w2, 0, w2, h2);  // Clear old
                if(this.radioButton2.Checked)  // Rotate180FlipX
                {
                    im2.RotateFlip(RotateFlipType.Rotate180FlipX);
                    g.DrawImage(im2, 0, h2, w2, h2);
                }
                else g.FillRectangle(b, 0, h2, w2, h2);  // Clear old
        
                if(this.radioButton3.Checked)  // Rotate180FlipNone
                {
                    im2.RotateFlip(RotateFlipType.Rotate180FlipNone);
                    g.DrawImage(im2, w2, h2, w2, h2);  // Clear old
                }
                else g.FillRectangle(b, w2, h2, w2, h2);
                im2.Dispose();
            }
            else Clear(g);
    
            b.Dispose();    g.Dispose();
        }
        protected void ReadImage()
        {
            string path = @"Himalaya.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.VerticalResolution

 

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);
     }
}