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How to: Use a Pen to Draw Lines

To draw lines, you need a Graphics object and a Pen object. The Graphics object provides the DrawLine method, and the Pen object stores features of the line, such as color and width.

The following example draws a line from (20, 10) to (300, 100). The first statement uses the Pen class constructor to create a black pen. The one argument passed to the Pen constructor is a Color object created with the FromArgb method. The values used to create the Color object — (255, 0, 0, 0) — correspond to the alpha, red, green, and blue components of the color. These values define an opaque black pen.

Pen pen = new Pen(Color.FromArgb(255, 0, 0, 0));
e.Graphics.DrawLine(pen, 20, 10, 300, 100);

The preceding example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Paint event handler.

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