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The functions in the Watcom C Graphics Library can be organized into a
number of classes:

Environment Functions

    These functions deal with the hardware environment.

Coordinate System Functions

    These functions deal with coordinate systems and mapping coordinates
    from one system to another.

Attribute Functions

    These functions control the display of graphical images.

Drawing Functions

    These functions display graphical images such as lines and ellipses.

Text Functions

    These functions deal with displaying text in both graphics and text
    modes.

Graphics Text Functions

    These functions deal with displaying graphics text.

Image Manipulation Functions

    These functions store and retrieve screen images.

Font Manipulation Functions

    These functions deal with displaying font based text.

Presentation Graphics Functions

    These functions deal with displaying presentation graphics elements such
    as bar charts and pie charts.

The following subsections describe these function classes in more detail.
 Each function in the class is noted with a brief description of its
purpose.