PaintEventArgs.Graphics Propriedade
Importante
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Obtém os elementos gráficos usados para pintar.
public:
property System::Drawing::Graphics ^ Graphics { System::Drawing::Graphics ^ get(); };
public System.Drawing.Graphics Graphics { get; }
member this.Graphics : System.Drawing.Graphics
Public ReadOnly Property Graphics As Graphics
O objeto Graphics usado para pintar. O objeto Graphics fornece métodos para desenhar objetos no dispositivo de vídeo.
O exemplo a seguir demonstra o tratamento do Paint evento e o uso da PaintEventArgs classe para desenhar retângulos no formulário. Os MouseDown eventos e MouseUp são tratados para determinar o tamanho do retângulo. O exemplo também demonstra o Invalidate método para invalidar a área do retângulo, fazendo com que ele seja redesenhado.
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
Produto | Versões |
---|---|
.NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
Windows Desktop | 3.0, 3.1, 5, 6, 7, 8, 9 |
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