X is a world coordinate value. The Y coordinate for the position point for the text string. Y is a world coordinate value. Each character is surrounded by an imaginary box called the character body . The ratio of height to width in a character body is part of the font definition.
Most fonts allow the width of the character body to vary from character to character.
The character body is delimited by the lines labeled left, right, bottom, and top. The character itself is delimited in the vertical by a base and a cap. The distance between the base and the cap is the character height . The character body usually will contain some white space to the left and right of the character in order to provide pleasing character separations when character bodies are concatenated to produce an output text string. A box that consists of the concatenated character bodies of a series of horizontal or vertical characters defines a text extent rectangle.