C # Custom Control Development Instance (1)

Control | Control development source file: Http://ded.nuaa.edu.cn/download/Windows%20Extended%20Controls.rar
Sample code: Http://ded.nuaa.edu.cn/download/WindowsApplication6.rar

A recent image acquisition requires a graphical selection control, but there is no shape control in. NET similar to VB, so consider writing a control yourself.

I'm going to create the control from scratch, which is mainly used to select the rectangle of the graphic, with a few properties color bordercolor: Border color, color BackColor: Background color, bool resizeble: whether removable, Rectangle selectrectangle: Select the area.
Open vs2003 (this version I use), create a new C # Control Library, OK, and copy the following code into your code.

Using System;
Using System.Collections;
Using System.ComponentModel;
Using System.Drawing;
Using System.Data;
Using System.Windows.Forms;

Namespace Windowsextendedcontrols
{
<summary>
Control
</summary>
public class ShapeEx:System.Windows.Forms.Control
{
<summary>
The required designer variable.
</summary>
///
Private color _bordercolor=new color ();
Private color _backcolor=new color ();
private bool _resizeble;
Private point _selflocation=new Point ();
Private point _mouselocation=new Point ();
private int _selfwidth;
private int _selfheight;
private int _selectselctedindex;//0-8,0:sizeall
Private Rectangle _rectleftselector=new Rectangle ();
Private Rectangle _recttopselector=new Rectangle ();
Private Rectangle _rectrightselector=new Rectangle ();
Private Rectangle _rectbottomselector=new Rectangle ();
Private Rectangle _rectlefttopselector=new Rectangle ();
Private Rectangle _rectrighttopselector=new Rectangle ();
Private Rectangle _rectrightbottomselector=new Rectangle ();
Private Rectangle _rectleftbottomselector=new Rectangle ();
Private System.ComponentModel.Container components = null;
Public Shapeex ()
{
This call is required for the Windows.Forms form designer.
InitializeComponent ();

TODO: Add any initialization after the initcomponent call

}
[DefaultValue ("Black"), Description ("Border Color"), Category ("appearance")]
Public Color BorderColor
{
Get
{
Insert code here.
return _bordercolor;
}
Set
{
_bordercolor=value;
This. Invalidate ();
}
}
[DefaultValue ("Control"), Description ("Background color"), Category ("appearance")]
public override Color BackColor
{
Get
{
Insert code here.
return _backcolor;
}
Set
{
_backcolor=value;
This. Invalidate ();
}
}
[DefaultValue (False), Description ("control size can be dragged and edited in Run"), Category ("Behavior")]
public bool Resizeble
{
Get
{
Insert code here.
return _resizeble;
}
Set
{
_resizeble=value;
This. Invalidate ();
}
}
[Description ("Control selection Area"), Category ("Behavior")]
Public Rectangle Selectrectangle
{
Get
{
Rectangle selectrectangler=new Rectangle ();
Selectrectangler.x = this. location.x+7;
Selectrectangler.y = this. location.y+7;
Selectrectangler.height = this. Height-15;
Selectrectangler.width = this. Width-15;
return selectrectangler;
}

}

protected override void OnPaint (PaintEventArgs pe)
{
Calling the base class OnPaint
Base. OnPaint (PE);
Redrawcontrol (PE. Graphics);
}
private void Drawselector (Graphics Graphics)
{
SolidBrush selectorpen=new SolidBrush (color.white);
Pen borderpen=new Pen (this._bordercolor,1);
Try
{
Solid

Pointf[] leftpoints=getpointf (0,this. height/2-3,6,6);
Graphics. FillClosedCurve (Selectorpen, leftpoints);

Pointf[] toppoints=getpointf (this. width/2-3,0,6,6);
Graphics. FillClosedCurve (Selectorpen, toppoints);

Pointf[] rightpoints=getpointf (this. Width-7,this. height/2-3,6,6);
Graphics. FillClosedCurve (Selectorpen, rightpoints);

Pointf[] bottompoints=getpointf (this. Width/2-3,this. height-7,6,6);
Graphics. FillClosedCurve (Selectorpen, bottompoints);

Pointf[] lefttoppoints=getpointf (0,0,6,6);
Graphics. FillClosedCurve (Selectorpen, lefttoppoints);

Pointf[] righttoppoints=getpointf (this. width-7,0,6,6);
Graphics. FillClosedCurve (Selectorpen, righttoppoints);

Pointf[] rightbottompoints=getpointf (this. Width-7,this. height-7,6,6);
Graphics. FillClosedCurve (Selectorpen, rightbottompoints);

Pointf[] leftbottompoints=getpointf (0,this. height-7,6,6);
Graphics. FillClosedCurve (Selectorpen, leftbottompoints);
Border
_rectleftselector.x = 0;
_rectleftselector.y = this. height/2-3;
_rectleftselector.height = 6;
_rectleftselector.width = 6;
Graphics. DrawRectangle (Borderpen, _rectleftselector);

_recttopselector.x = this. width/2-3;
_RECTTOPSELECTOR.Y = 0;
_recttopselector.height = 6;
_recttopselector.width = 6;
Graphics. DrawRectangle (Borderpen, _recttopselector);

_rectrightselector.x = this. Width-7;
_rectrightselector.y = this. height/2-3;
_rectrightselector.height = 6;
_rectrightselector.width = 6;
Graphics. DrawRectangle (Borderpen, _rectrightselector);

_rectbottomselector.x = this. width/2-3;
_rectbottomselector.y = this. Height-7;
_rectbottomselector.height = 6;
_rectbottomselector.width = 6;
Graphics. DrawRectangle (Borderpen, _rectbottomselector);

_rectlefttopselector.x=0;
_rectlefttopselector.y=0;
_rectlefttopselector.width=6;
_rectlefttopselector.height=6;
Graphics. DrawRectangle (Borderpen, _rectlefttopselector);

_rectrighttopselector.x=this. Width-7;
_rectrighttopselector.y=0;
_rectrighttopselector.width=6;
_rectrighttopselector.height=6;
Graphics. DrawRectangle (Borderpen, _rectrighttopselector);

_rectrightbottomselector.x=this. Width-7;
_rectrightbottomselector.y=this. Height-7;
_rectrightbottomselector.width=6;
_rectrightbottomselector.height=6;
Graphics. DrawRectangle (Borderpen, _rectrightbottomselector);

_rectleftbottomselector.x=0;
_rectleftbottomselector.y=this. Height-7;
_rectleftbottomselector.width=6;
_rectleftbottomselector.height=6;
Graphics. DrawRectangle (Borderpen, _rectleftbottomselector);
}
catch (Exception E)
{
Throw E;
}
Finally
{
Selectorpen.dispose ();
Borderpen.dispose ();
}

}
private void Redrawcontrol (Graphics Graphics)
{

Try
{

Draw background
/*
Graphics. Clear (This._backcolor);
SolidBrush backpen=new SolidBrush (This._backcolor);
PointF point1 = new PointF (1,1);
PointF Point2 = new PointF (this. width-2,1);
PointF Point3 = new PointF (this. Width-2,this. HEIGHT-2);
PointF point4 = new PointF (1,this. HEIGHT-2);
Pointf[] points = {point1, Point2, Point3, point4};
Graphics. FillClosedCurve (Backpen, points);
*/
Draw Border
Rectangle rectborder=new Rectangle ();
Pen borderpen=new Pen (this._bordercolor,1);
rectborder.x = 7;
RECTBORDER.Y = 7;
Rectborder.height = this. Height-15;
Rectborder.width = this. Width-15;
Graphics. DrawRectangle (Borderpen, Rectborder);
Draw an edit box
if (_resizeble)
{
Drawselector (graphics);
}
}
catch (Exception E)
{
Throw E;
}
Finally
{
Graphics. Dispose ();
}
}
<summary>
Clean up all resources that are in use.
</summary>
Private pointf[] getpointf (int x,int y,int width,int Height) {
PointF point1 = new PointF (x,y);
PointF Point2 = new PointF (x+width,y);
PointF Point3 = new PointF (x+width,y+height);
PointF point4 = new PointF (x,y+height);
Pointf[] points = {point1, Point2, Point3, point4};
return points;
}
protected override void Dispose (bool disposing)
{
if (disposing)
{
if (Components!= null)
Components. Dispose ();
}
Base. Dispose (disposing);
}

Code generated #region Component Designer
<summary>
Designer supports the desired method-do not use the Code Editor
Modify the contents of this method.
</summary>
private void InitializeComponent ()
{
components = new System.ComponentModel.Container ();
This. Resize+=new EventHandler (shapeex_resize);
This. Mousedown+=new MouseEventHandler (Shapeex_mousedown);
This. Mousemove+=new MouseEventHandler (Shapeex_mousemove);
This. Mouseleave+=new EventHandler (Shapeex_mouseleave);
This. Mouseup+=new MouseEventHandler (shapeex_mouseup);

This._bordercolor=color.black;
This._backcolor=color.fromname ("control");
This._resizeble=false;
This._selectselctedindex=-1;
SetStyle (Controlstyles.supportstransparentbackcolor, true);
}
#endregion

private void Shapeex_resize (object sender, EventArgs e)
{
if (this. width<16 | | This. HEIGHT&LT;16)
{
This. width=16;
This. height=16;
}
This. Invalidate ();
}



private void Shapeex_mousedown (object sender, MouseEventArgs e)
{
if (_resizeble)
{
if (_rectleftselector.contains (e.x,e.y) | | | | _rectrightselector.contains (E.X,E.Y) | | _recttopselector.contains (e.X,e. Y) | | _rectbottomselector.contains (e.x,e.y) | | _rectlefttopselector.contains (e.x,e.y) | | _rectrighttopselector.contains (e.x,e.y) | | _rectrightbottomselector.contains (e.x,e.y) | | _rectleftbottomselector.contains (E.X,E.Y))
{
if (_rectlefttopselector.contains (E.X,E.Y))
{
This. Cursor=cursors.sizenwse;
This._selectselctedindex=1;
}

if (_recttopselector.contains (E.X,E.Y))
{
This. Cursor=cursors.sizens;
this._selectselctedindex=2;
}
if (_rectrighttopselector.contains (E.X,E.Y))
{
This. CURSOR=CURSORS.SIZENESW;
this._selectselctedindex=3;
}
if (_rectrightselector.contains (E.X,E.Y))
{
This. Cursor=cursors.sizewe;
this._selectselctedindex=4;
}
if (_rectrightbottomselector.contains (E.X,E.Y))
{
This. Cursor=cursors.sizenwse;
this._selectselctedindex=5;
}
if (_rectbottomselector.contains (E.X,E.Y))
{
This. Cursor=cursors.sizens;
this._selectselctedindex=6;
}
if (_rectleftbottomselector.contains (E.X,E.Y))
{
This. CURSOR=CURSORS.SIZENESW;
this._selectselctedindex=7;
}
if (_rectleftselector.contains (E.X,E.Y))
{
This. Cursor=cursors.sizewe;
this._selectselctedindex=8;
}

}
Else
{
This. Cursor=cursors.sizeall;
this._selectselctedindex=0;
}
This._selflocation.x=this. location.x;
This._selflocation.y=this. LOCATION.Y;
this._mouselocation.x=cursor.position.x;
THIS._MOUSELOCATION.Y=CURSOR.POSITION.Y;
This._selfwidth=this. Width;
This._selfheight=this. Height;
}
}

private void Shapeex_mousemove (object sender, MouseEventArgs e)
{
Move and resize
Switch (THIS._SELECTSELCTEDINDEX)
{
Case 0:
This. Location=new Point (cursor.position.x-(_mouselocation.x-_selflocation.x), cursor.position.y-(_MouseLocation.Y-_ SELFLOCATION.Y));
Break
Case 1:
This. height=this._selfheight-(CURSOR.POSITION.Y-_MOUSELOCATION.Y);
This. width=this._selfwidth-(cursor.position.x-_mouselocation.x);
This. Location=new Point (cursor.position.x-_mouselocation.x+_selflocation.x,cursor.position.y-_mouselocation.y+_ SELFLOCATION.Y);
Break
Case 2:
This. height=this._selfheight-(CURSOR.POSITION.Y-_MOUSELOCATION.Y);
This. Location=new Point (_SELFLOCATION.X,CURSOR.POSITION.Y-_MOUSELOCATION.Y+_SELFLOCATION.Y);
Break
Case 3:
This. height=this._selfheight-(CURSOR.POSITION.Y-_MOUSELOCATION.Y);
This. width=this._selfwidth+ (cursor.position.x-_mouselocation.x);
This. Location=new Point (_selflocation.x,cursor.position.y-(_MOUSELOCATION.Y-_SELFLOCATION.Y));
Break
Case 4:
This. width=this._selfwidth+ (cursor.position.x-_mouselocation.x);
Break
Case 5:
This. height=this._selfheight+ (CURSOR.POSITION.Y-_MOUSELOCATION.Y);
This. width=this._selfwidth+ (cursor.position.x-_mouselocation.x);
Break
Case 6:
This. height=this._selfheight+ (CURSOR.POSITION.Y-_MOUSELOCATION.Y);
Break
Case 7:
This. height=this._selfheight+ (CURSOR.POSITION.Y-_MOUSELOCATION.Y);
This. width=this._selfwidth-(cursor.position.x-_mouselocation.x);
This. Location=new Point (CURSOR.POSITION.X-_MOUSELOCATION.X+_SELFLOCATION.X,_SELFLOCATION.Y);
Break
Case 8:
This. width=this._selfwidth-(cursor.position.x-_mouselocation.x);
This. Location=new Point (CURSOR.POSITION.X-_MOUSELOCATION.X+_SELFLOCATION.X,_SELFLOCATION.Y);
Break
}

}

private void Shapeex_mouseleave (object sender, EventArgs e)
{
This. Cursor=cursors.default;
This._selectselctedindex=-1;
}

private void Shapeex_mouseup (object sender, MouseEventArgs e)
{
This. Cursor=cursors.default;
This._selectselctedindex=-1;
}

}
}