Graphics Property
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PaintEventArgs.Graphics Property

 

Gets the graphics used to paint.

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

public Graphics Graphics { get; }

Property Value

Type: System.Drawing.Graphics

The Graphics object used to paint. The Graphics object provides methods for drawing objects on the display device.

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;
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);

}

// 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();
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",
        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);
}

.NET Framework
Available since 1.1
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