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PaintEventArgs::Graphics Property
Visual Studio 2010
Gets the graphics used to paint.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
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.
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 ); }
// 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 ); }
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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