Image display and rollover controls (user-defined controls)--I'll join in the fun--(turn)

Control | Displays the using System;
Using System.Collections;
Using System.ComponentModel;
Using System.Drawing;
Using System.Data;
Using System.Windows.Forms;

Namespace Imagezoomer
{
<summary>
///
</summary>

Enumeration type definition, defining four ways to flip the image
public enum Flipmodestyle
{
noflip=0,//not Flip
flipx=1,//Horizontal Flip
flipy=2,//Vertical Flip
flipxy=3//Horizontal Vertical Flip
}

event data class definition, report image display dimensions
public class DisplaySizeChangedEventArgs:System.EventArgs
{
public int Width;
public int Height;
Public Displaysizechangedeventargs ()
{
}
}

Statement of event representatives
public delegate void Displaysizechangedeventhandler (Object Sender,displaysizechangedeventargs e);

User-defined control classes
public class ImageZoomerControl:System.Windows.Forms.Control
{
private int width;//Control width
private int height;//Control height
The image on the private System.Drawing.Bitmap bitmap;//control
Flip mode of private Flipmodestyle flip;//image
Private Event Displaysizechangedeventhandler eventhandler;//event

Construct method to initialize data members
Public Imagezoomercontrol ()
{
Width=this.width;
Height=this.height;
Bitmap=null;
Eventhandler=null;
}

Width Property
[
Category ("Imagezoomer"),
Description ("the displayed image width.")
]
public int Displaywidth
{
Get
{
return width;
}
Set
{
if (value>=0)
{
Width=value;
Invalidate (this. ClientRectangle);
}
}
}

Height attribute
[
Category ("Imagezoomer"),
Description ("the displayed image height.")
]
public int Displayheight
{
Get
{
return height;
}
Set
{
if (value>=0)
{
Height=value;
This. Invalidate (this. ClientRectangle);
}
}
}

Image Properties
[
Category ("Imagezoomer"),
Description ("The image displayed by-control."),
DefaultValue (NULL)
]
Public Bitmap DisplayImage
{
Get
{
return bitmap;
}
Set
{
Bitmap=value;
if (bitmap!=null)
{
Width=bitmap. Width;
Height=bitmap. Height;
}
Else
{
Width=this.width;
Height=this.height;
}
This. Invalidate (this. ClientRectangle);
}
}

Flip Style properties
[
Category ("Imagezoomer"),
Description ("Specify how the image would be flipped.")
]
Public Flipmodestyle Flipmode
{
Get
{
return flip;
}
Set
{
Flip=value;
This. Invalidate (this. ClientRectangle);
}
}

Event Properties
[
Category ("Imagezoomer"),
Description ("occurs when" the image size is changed.)
]
Public event Displaysizechangedeventhandler Displaysizechanged
{
Add
{
Eventhandler+=value;
}
Remove
{
Eventhandler-=value;
}
}


protected override void OnPaint (PaintEventArgs pe)
{
if (bitmap==null)
{
Return
}
Graphics G=pe. Graphics;

Convert from array
System.Drawing.Drawing2D.Matrix transform;//Distance Array
if (flip. Equals (FLIPMODESTYLE.FLIPX))
{
Transform=new System.Drawing.Drawing2D.Matrix ( -1,0,0,1,width,0);
}
else if (flip. Equals (flipmodestyle.flipy))
{
Transform=new System.Drawing.Drawing2D.Matrix (1,0,0,-1,0,height);
}
else if (flip. Equals (FLIPMODESTYLE.FLIPXY))
{
Transform=new System.Drawing.Drawing2D.Matrix ( -1,0,0,-1,width,height);
}
Else
{
Transform=new System.Drawing.Drawing2D.Matrix (1,0,0,1,0,0);
}
To set the conversion distance array
G.transform=transform;
G.drawimage (bitmap,new System.Drawing.Rectangle (0,0,width,height),
0,0,bitmap. Width,bitmap. Height,
GraphicsUnit.Pixel);
Resume drawing plane
G.resettransform ();

}

Methods of issuing events
protected virtual void ondisplaysizechanged (Displaysizechangedeventargs e)
{
Invoke the method that the event object points to
This. Invoke (Eventhandler,new object[]
{
This,e
}
);
}

Overloaded method, calling Ondisplaysizechanged () to emit an event
protected override void OnMouseDown (MouseEventArgs e)
{
width=e.x;
Height=e.y;
This. Invalidate (this. ClientRectangle);

Displaysizechangedeventargs eventdata=new Displaysizechangedeventargs ();
Eventdata.width=width;
Eventdata.height=height;

This. Ondisplaysizechanged (EVENTDATA);

Base. OnMouseDown (e);
}

}
}