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PaintEventArgs Class

Provides data for the Paint event.

For a list of all members of this type, see PaintEventArgs Members.

System.Object
   System.EventArgs
      System.Windows.Forms.PaintEventArgs

[Visual Basic]
Public Class PaintEventArgs
   Inherits EventArgs
   Implements IDisposable
[C#]
public class PaintEventArgs : EventArgs, IDisposable
[C++]
public __gc class PaintEventArgs : public EventArgs, IDisposable
[JScript]
public class PaintEventArgs extends EventArgs implements
   IDisposable

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Remarks

The Paint event occurs when a control is redrawn. A PaintEventArgs specifies the Graphics to use to paint the control and the ClipRectangle in which to paint.

For information about the event model, see Events and Delegates.

Example

[Visual Basic, C#, C++] The following example demonstrates handling the Paint event and using the PaintEventArgs class to draw rectangles on the form. The MouseDown and MouseUp events are handled to determine the size of the rectangle. The example also demonstrates the Invalidate method to invalidate the area of the rectangle, causing it to be redrawn.

[Visual Basic] 
Dim RcDraw As Rectangle
Dim PenWidth As Integer = 5


Private Sub Form1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseDown

    ' Determine the initial rectangle coordinates...

    RcDraw.X = e.X
    RcDraw.Y = e.Y

End Sub

Private Sub Form1_MouseUp(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseUp

    ' Determine the width and height of the rectangle...

    If e.X < RcDraw.X Then
        RcDraw.Width = RcDraw.X - e.X
        RcDraw.X = e.X
    Else
        RcDraw.Width = e.X - RcDraw.X
    End If

    If e.Y < RcDraw.Y Then
        RcDraw.Height = RcDraw.Y - e.Y
        RcDraw.Y = e.Y
    Else
        RcDraw.Height = e.Y - RcDraw.Y
    End If

    ' Force a repaint of the region occupied by the rectangle...

    Me.Invalidate(RcDraw)

End Sub

Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles MyBase.Paint

    ' Draw the rectangle...

    e.Graphics.DrawRectangle(New Pen(Color.Blue, PenWidth), RcDraw)

End Sub



[C#] 

        private Rectangle RcDraw;
        private float PenWidth = 5;

        private void Form1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
        {

            // Determine the initial rectangle coordinates...

            RcDraw.X = e.X;
            RcDraw.Y = e.Y;
        
        }

        private void Form1_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
        {

            // Determine the width and height of the rectangle...

            if(e.X < RcDraw.X)
            {
                RcDraw.Width = RcDraw.X - e.X;
                RcDraw.X = e.X;
            }
            else
            {
                RcDraw.Width = e.X - RcDraw.X;
            }

            if(e.Y < RcDraw.Y)
            {
                RcDraw.Height = RcDraw.Y - e.Y;
                RcDraw.Y = e.Y;
            }
            else
            {
                RcDraw.Height = e.Y - RcDraw.Y;
            }

            // Force a repaint of the region occupied by the rectangle...

            this.Invalidate(RcDraw);
        
        }

        private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
        {

            // Draw the rectangle...

            e.Graphics.DrawRectangle(new Pen(Color.Blue, PenWidth), RcDraw);
            
        }


[C++] 

private:
   Rectangle RcDraw;

   void Form1_MouseDown(Object* /*sender*/, System::Windows::Forms::MouseEventArgs* e)
   {
      // Determine the initial rectangle coordinates...

      RcDraw.X = e->X;
      RcDraw.Y = e->Y;
   }

   void Form1_MouseUp(Object* /*sender*/, System::Windows::Forms::MouseEventArgs* e)
   {
      // Determine the width and height of the rectangle...

      if(e->X < RcDraw.X)
      {
         RcDraw.Width = RcDraw.X - e->X;
         RcDraw.X = e->X;
      }
      else
      {
         RcDraw.Width = e->X - RcDraw.X;
      }

      if(e->Y < RcDraw.Y)
      {
         RcDraw.Height = RcDraw.Y - e->Y;
         RcDraw.Y = e->Y;
      }
      else
      {
         RcDraw.Height = e->Y - RcDraw.Y;
      }

      // Force a repaint of the region occupied by the rectangle...

      this->Invalidate(RcDraw);
   }

   void Form1_Paint(Object* /*sender*/, System::Windows::Forms::PaintEventArgs* e)
   {
      // Draw the rectangle...
      float PenWidth = 5;
      e->Graphics->DrawRectangle(new Pen(Color::Blue, PenWidth), RcDraw);
   }

[Visual Basic] 
' This example creates a PictureBox control on the form and draws to it. 
' This example assumes that the Form_Load event handling method is connected 
' to the Load event of the form.
Private pictureBox1 As New PictureBox()

Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Load
    ' Dock the PictureBox to the form and set its background to white.
    pictureBox1.Dock = DockStyle.Fill
    pictureBox1.BackColor = Color.White
    ' Connect the Paint event of the PictureBox to the event handling method.
    AddHandler pictureBox1.Paint, AddressOf Me.pictureBox1_Paint

    ' Add the PictureBox control to the Form.
    Me.Controls.Add(pictureBox1)
End Sub 'Form1_Load


Private Sub pictureBox1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs)
    ' Create a local version of the graphics object for the PictureBox.
    Dim g As Graphics = e.Graphics

    ' Draw a string on the PictureBox.
    g.DrawString("This is a diagonal line drawn on the control", _
        New Font("Arial", 10), Brushes.Red, New PointF(30.0F, 30.0F))
    ' Draw a line in the PictureBox.
    g.DrawLine(System.Drawing.Pens.Red, pictureBox1.Left, _ 
        pictureBox1.Top, pictureBox1.Right, pictureBox1.Bottom)
End Sub 'pictureBox1_Paint

[C#] 
// This example creates a PictureBox control on the form and draws to it.
// This example assumes that the Form_Load event handling method is
// connected to the Load event of the form.

private PictureBox pictureBox1 = new PictureBox();
private void Form1_Load(object sender, System.EventArgs e)
{
    // Dock the PictureBox to the form and set its background to white.
    pictureBox1.Dock = DockStyle.Fill;
    pictureBox1.BackColor = Color.White;
    // Connect the Paint event of the PictureBox to the event handling method.
    pictureBox1.Paint += new System.Windows.Forms.PaintEventHandler(this.pictureBox1_Paint);

    // Add the PictureBox control to the Form.
    this.Controls.Add(pictureBox1);
}

private void pictureBox1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{
    // Create a local version of the graphics object for the PictureBox.
    Graphics g = e.Graphics;

    // Draw a string on the PictureBox.
    g.DrawString("This is a diagonal line drawn on the control",
        new Font("Arial",10), System.Drawing.Brushes.Blue, new Point(30,30));
    // Draw a line in the PictureBox.
    g.DrawLine(System.Drawing.Pens.Red, pictureBox1.Left, pictureBox1.Top,
        pictureBox1.Right, pictureBox1.Bottom);
}

[C++] 
// This example creates a PictureBox control on the form and draws to it.
// This example assumes that the Form_Load event handling method is
// connected to the Load event of the form.

private:
PictureBox* pictureBox1;

void Form1_Load(Object* /*sender*/, System::EventArgs* /*e*/)
{
   pictureBox1 = new PictureBox();
   // Dock the PictureBox to the form and set its background to white.
   pictureBox1->Dock = DockStyle::Fill;
   pictureBox1->BackColor = Color::White;
   // Connect the Paint event of the PictureBox to the event handling method.
   pictureBox1->Paint += new System::Windows::Forms::PaintEventHandler(this, &Form1::pictureBox1_Paint);

   // Add the PictureBox control to the Form.
   this->Controls->Add(pictureBox1);
}

void pictureBox1_Paint(Object* /*sender*/, System::Windows::Forms::PaintEventArgs* e)
{
   // Create a local version of the graphics object for the PictureBox.
   Graphics* g = e->Graphics;

   // Draw a string on the PictureBox.
   g->DrawString(S"This is a diagonal line drawn on the control",
      new System::Drawing::Font(S"Arial",10), System::Drawing::Brushes::Blue, Point(30,30));
   // Draw a line in the PictureBox.
   g->DrawLine(System::Drawing::Pens::Red, pictureBox1->Left, pictureBox1->Top,
      pictureBox1->Right, pictureBox1->Bottom);
}

[JScript] No example is available for JScript. To view a Visual Basic, C#, or C++ example, click the Language Filter button Language Filter in the upper-left corner of the page.

Requirements

Namespace: System.Windows.Forms

Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family, .NET Compact Framework

Assembly: System.Windows.Forms (in System.Windows.Forms.dll)

See Also

PaintEventArgs Members | System.Windows.Forms Namespace | Graphics | Rectangle

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