PaintEventArgs Klasa
Definicja
Ważne
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Udostępnia dane dla zdarzenia Paint.
public ref class PaintEventArgs : EventArgs, IDisposable
public ref class PaintEventArgs : EventArgs, IDisposable, System::Drawing::IDeviceContext
public class PaintEventArgs : EventArgs, IDisposable
public class PaintEventArgs : EventArgs, IDisposable, System.Drawing.IDeviceContext
type PaintEventArgs = class
inherit EventArgs
interface IDisposable
type PaintEventArgs = class
inherit EventArgs
interface IDisposable
interface IDeviceContext
Public Class PaintEventArgs
Inherits EventArgs
Implements IDisposable
Public Class PaintEventArgs
Inherits EventArgs
Implements IDeviceContext, IDisposable
- Dziedziczenie
- Pochodne
- Implementuje
Przykłady
W poniższym przykładzie pokazano obsługę Paint zdarzenia i użycie PaintEventArgs klasy do rysowania prostokątów w formularzu. Zdarzenia MouseDown i MouseUp są obsługiwane w celu określenia rozmiaru prostokąta. W przykładzie pokazano również metodę Invalidate unieważnienia obszaru prostokąta, co powoduje ponowne rysowanie.
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( gcnew Pen( Color::Blue,PenWidth ), RcDraw );
}
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);
}
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
// This example creates a PictureBox control on the form and draws to it.
// This example assumes that the Form_Load event handler method is
// connected to the Load event of the form.
private:
PictureBox^ pictureBox1;
void Form1_Load( Object^ /*sender*/, System::EventArgs^ /*e*/ )
{
pictureBox1 = gcnew 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 handler method.
pictureBox1->Paint += gcnew 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( "This is a diagonal line drawn on the control",
gcnew System::Drawing::Font( "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 );
}
// This example creates a PictureBox control on the form and draws to it.
// This example assumes that the Form_Load event handler method is
// connected to the Load event of the form.
private PictureBox pictureBox1 = new PictureBox();
// Cache font instead of recreating font objects each time we paint.
private Font fnt = new Font("Arial",10);
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 handler 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",
fnt, 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);
}
' This example creates a PictureBox control on the form and draws to it.
' This example assumes that the Form_Load event handler method is connected
' to the Load event of the form.
Private pictureBox1 As New PictureBox()
Private fnt as New Font("Arial", 10)
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 handler method.
AddHandler pictureBox1.Paint, AddressOf Me.pictureBox1_Paint
' Add the PictureBox control to the Form.
Me.Controls.Add(pictureBox1)
End Sub
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", _
fnt, 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
Uwagi
Zdarzenie występuje, gdy kontrolka Paint jest ponownie rysowana. A PaintEventArgs określa, Graphics aby użyć do malowania kontrolki i ClipRectangle w którym malować.
Aby uzyskać informacje o modelu zdarzeń, zobacz Obsługa i zgłaszanie zdarzeń.
Konstruktory
PaintEventArgs(Graphics, Rectangle) |
Inicjuje PaintEventArgs nowe wystąpienie klasy z określoną grafiką i przycinanie prostokąta. |
Właściwości
ClipRectangle |
Pobiera prostokąt, w którym ma być malowany. |
Graphics |
Pobiera grafikę używaną do malowania. |
Metody
Dispose() |
Zwalnia wszelkie zasoby używane przez element PaintEventArgs. |
Dispose(Boolean) |
Zwalnia zasoby niezarządzane używane przez element PaintEventArgs i opcjonalnie zwalnia zasoby zarządzane. |
Equals(Object) |
Określa, czy dany obiekt jest taki sam, jak bieżący obiekt. (Odziedziczone po Object) |
Finalize() |
Umożliwia obiektowi próbę zwolnienia zasobów i wykonania innych operacji oczyszczania przed odzyskaniem przez odzyskiwanie pamięci. |
GetHashCode() |
Służy jako domyślna funkcja skrótu. (Odziedziczone po Object) |
GetType() |
Type Pobiera wartość bieżącego wystąpienia. (Odziedziczone po Object) |
MemberwiseClone() |
Tworzy płytkią kopię bieżącego Objectelementu . (Odziedziczone po Object) |
ToString() |
Zwraca ciąg reprezentujący bieżący obiekt. (Odziedziczone po Object) |
Jawne implementacje interfejsu
IDeviceContext.GetHdc() |
Zwraca dojście do kontekstu urządzenia z systemem Windows. |
IDeviceContext.ReleaseHdc() |
Zwalnia uchwyt kontekstu urządzenia z systemem Windows. |