Course IPCis: Image Processing with C#
Chapter C1: More Professional: The BitmapWithButtons Project
Copyright © by V. Miszalok, last update: 06-05-2010
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Course IPCis: Image Processing with C#
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This is a more professional version of the Bitmap project. On the left it has buttons that can be clicked in arbitrary order and on the right it has a Panel = space to display something. Otherwise it is identical to the original Bitmap project.
Copy all this code into an empty Form1.cs of a new Windows Application C#-project bmpbuttons1 and clear Form1.Designer.cs and Program.cs.
using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Windows.Forms;
public class Form1 : Form
{ [STAThread] static void Main()
{ Form form = new Form1();
form.BackColor = Color.White;
Application.Run( form );
}
Brush bbrush = SystemBrushes.ControlText;
Brush rbrush = new SolidBrush( Color.Red );
Bitmap bmp;
const Int32 nButtons = 10;
Button [] button = new Button[nButtons];
Panel panel = new Panel();
String filename = "http://www.miszalok.de/Images/Butterfly.jpg";
Graphics g;
public Form1()
{ MenuItem miRead = new MenuItem( "&Read", new EventHandler( MenuFileRead ) );
MenuItem miExit = new MenuItem( "&Exit", new EventHandler( MenuFileExit ) );
MenuItem miFile = new MenuItem( "&File", new MenuItem[] { miRead, miExit } );
Menu = new System.Windows.Forms.MainMenu( new MenuItem[] { miFile } );
Text = "Bitmap1";
for ( int i=0; i < nButtons; i++ )
{ button[i] = new Button(); Controls.Add( button[i] );
button[i].Click += new EventHandler( button_handler );
button[i].BackColor = SystemColors.Control;
}
button[0].Text = "Description";
button[1].Text = "Original";
button[2].Text = "Center";
button[3].Text = "H-Stretch";
button[4].Text = "V-Stretch";
button[5].Text = "FullSize";
button[6].Text = "Mirror";
button[7].Text = "ZoomAnim";
button[8].Text = "Rotation";
button[9].Text = "Clear";
Controls.Add( panel );
panel.Paint += new PaintEventHandler( panel_paint );
try //Delete this and the following 5 lines if you have no Internet connection running.
{ System.Net.WebRequest webreq = System.Net.WebRequest.Create( filename );
System.Net.WebResponse webres = webreq.GetResponse();
System.IO.Stream stream = webres.GetResponseStream();
bmp = (Bitmap)Image.FromStream( stream );
} catch {};
//bmp = new Bitmap( typeof( Form1 ), "bmpbuttons1.Butterfly.jpg" ); //Butterfly.jpg as embedded resource
Size = new Size( 800, 600 );
}
private void MenuFileRead( object obj, EventArgs ea )
{ OpenFileDialog dlg = new OpenFileDialog();
if ( dlg.ShowDialog() != DialogResult.OK ) return;
try { bmp = (Bitmap)Image.FromFile( filename = dlg.FileName ); } catch { return; }
g.DrawImage( bmp, 0, 0 );
}
private void MenuFileExit( object obj, EventArgs ea )
{ Application.Exit(); }
protected void button_handler( object sender, EventArgs e )
{ int line = 0;
if ( bmp == null ) { g.DrawString( "Open an Image File !", Font, bbrush, 0, 0 ); return; }
Size pSize = panel.Size;
switch( ((Button)sender).Text )
{ case "Description": //Information
g.DrawString( "FileName = " + filename, Font, rbrush, 0, line+=Font.Height );
g.DrawString( "RawFormat = " + bmp.RawFormat.ToString(), Font, bbrush, 0, line+=Font.Height );
if ( bmp.RawFormat.Guid == ImageFormat.Bmp.Guid )
g.DrawString( "BMP", Font, bbrush, 0, line+=Font.Height );
if ( bmp.RawFormat.Guid == ImageFormat.Jpeg.Guid )
g.DrawString( "JPG", Font, bbrush, 0, line+=Font.Height );
g.DrawString( "Width = " + bmp.Width.ToString() , Font, bbrush, 0, line+=Font.Height );
g.DrawString( "Height = " + bmp.Height.ToString() , Font, bbrush, 0, line+=Font.Height );
g.DrawString( "PixelFormat = " + bmp.PixelFormat.ToString(), Font, bbrush, 0, line+=Font.Height );
break;
case "Original" : //Raw display
g.Clear( Color.White ); g.DrawImage( bmp, 0, 100, bmp.Width, bmp.Height );
break;
case "Center" : //Center
Int32 x = (pSize.Width - bmp.Width ) / 2;
Int32 y = (pSize.Height - bmp.Height) / 2;
g.DrawImage(bmp, x, y, bmp.Width, bmp.Height);
break;
case "H-Stretch" : //Horizontal stretch
x = 0;
y = ( pSize.Height - bmp.Height / 2 ) / 2;
g.DrawImage( bmp, x, y, pSize.Width, bmp.Height / 2 ); //full panel width, half bmp height
break;
case "V-Stretch" : //Vertical stretch
x = ( pSize.Width - bmp.Width / 2 ) / 2;
y = 0;
g.DrawImage( bmp, x, y, bmp.Width / 2, pSize.Height ); //half bmp width, full panel height
break;
case "FullSize" : //Full size
g.DrawImage( bmp, 0, 0, pSize.Width, pSize.Height );
break;
case "Mirror" : //Mirror
g.DrawImage( bmp, pSize.Width/2, pSize.Height/2, pSize.Width/2, pSize.Height/2 );
g.DrawImage( bmp, pSize.Width/2, pSize.Height/2, -pSize.Width/2, pSize.Height/2 );
g.DrawImage( bmp, pSize.Width/2, pSize.Height/2, pSize.Width/2, -pSize.Height/2 );
g.DrawImage( bmp, pSize.Width/2, pSize.Height/2, -pSize.Width/2, -pSize.Height/2 );
break;
case "ZoomAnim" : //Zoom animation
x = pSize.Width / 20;
y = pSize.Height / 20;
for ( Int32 i = 0; i < 20; i++ )
g.DrawImage( bmp, 0, 0, pSize.Width - x*i, pSize.Height - y*i );
break;
case "Rotation" : //Rotation animation
Single fx = panel.Width / 100;
Single fy = panel.Height / 100;
PointF[] p = new PointF[3];
p[1].X = panel.Width;
p[2].Y = panel.Height;
do
{ p[0].X += fx;
p[1].Y += fy;
p[2].Y -= fy;
g.DrawImage( bmp, p );
} while ( p[2].Y > 0 );
break;
case "Clear" : //Clear panel
g.Clear( Color.White );
break;
}
}
protected override void OnResize( EventArgs e )
{ Int32 w = ClientRectangle.Width / 5;
Int32 h = ClientRectangle.Height / nButtons;
Int32 i, top = 1;
for ( i=0; i < nButtons; i++ )
{ button[i].Top = top+2;
button[i].Left = 3;
button[i].Width = w;
button[i].Height = h - 3;
top += h;
}
panel.Location = new Point( w+4, 0 );
panel.Size = new Size( ClientRectangle.Width-panel.Location.X, ClientRectangle.Height );
g = panel.CreateGraphics();
}
protected void panel_paint( object sender, PaintEventArgs e )
{ g.DrawImage( bmp, 0, 100, bmp.Width, bmp.Height );
}
}
Run the program. Drag the borders of the form and observe how the buttons and the panel adapt to their new sizes. Load other images via the File-menu.
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