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This chapter is from the book

This chapter is from the book

Working with Pens

A pen is an object that defines line-drawing characteristics. Pens are used to define color, line width, and line style (solid, dashed, and so on), and pens are used with almost all the drawing methods you'll learn about in this hour.

C# supplies a number of predefined pens, and you can also create your own. To create your own pen, use the following syntax:

Pen variable = new Pen(color, width);

After a pen is created, you can set its properties to adjust its appearance. For example, all Pen objects have a DashStyle property that determines the appearance of lines drawn with the pen. Table 2 lists the possible values for DashStyle.

Table 2—Possible Values for DashStyle

Value

Description

Dash

Specifies a line consisting of dashes.

DashDot

Specifies a line consisting of a pattern of dashes and dots.

DashDotDot

Specifies a line consisting of alternating dashes and double dots.

Dot

Specifies a line consisting of dots.

Solid

Specifies a solid line.

Custom

Specifies a custom dash style. The Pen object contains properties that can be used to define the custom line.


The enumeration for DashStyle is part of the Drawing.Drawing2D object. Therefore, to create a new pen and use it to draw an ellipse, for example, you could use the following code:

Pen objMyPen = new Pen(System.Drawing.Color.DarkBlue, 3);
objMyPen.DashStyle = System.Drawing.Drawing2D.DashStyle.Dot;

C# includes many standard pens, which are available via the System.Drawing.Pens class, as in the following:

objPen = System.Drawing.Pens.DarkBlue;

When drawing using the techniques discussed shortly, you can use custom pens or system-defined pens—it's your choice.

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