Other Text Positioning Terms; Text Orientation; Printing Baseline - Ricoh MP 6002 User Manual

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1. IPDS Overview

• Setting the orientations of the +I and +B axes also implicitly sets their origins as one of the four

corners of the logical page or overlay.

• For details about the "IPDS Initialization Defaults", see p.39 "IPDS Initialization Defaults".

Other Text Positioning Terms

Some other terms that relate to text positioning and fonts include:

The combination of the inline sequence direction (the direction which characters are added to a line)

and the baseline sequence direction (the direction which lines are added to a page or overlay) identify

the text orientation for a page. The inline sequence direction can be 0, 90, 180 or 270 degrees. The

machine supports baseline sequence directions that are always rotated plus or minus 90 degrees from

the inline sequence direction. Therefore, there are eight text orientations for printing pages or overlays.

An imaginary line that extends across the page or overlay in the positive inline sequence direction (+I),

between pixels, and beginning from the baseline sequence printing coordinate (Bc). (Sometimes shown

as baseline as in the font terms baseline offset and baseline extent.)

In languages with a right to left or left to right reading order (for example, English), the printing baseline

is the imaginary line on which the main body of the character appears to rest. Descenders (the "tails" of

lower case g, j, p, q, and y characters) usually extend below the printing baseline.

In languages with a top to bottom reading order (for example, Kanji), the printing baseline is an

imaginary vertical line that passes through the center of the character.

Each font index record contains a Font Inline Sequence field. The field value specifies a relationship

between the inline sequence direction and the font rotation (the character pattern rotation for the font).

The printer uses the font index record to identify how to place characters on the printing baseline for a

page or overlay. The characters are placed in the combination of the inline sequence direction (the

printing direction) and the font rotation.

The Baseline Offset value is another field in the font index record. This value locates the printing baseline

relationship to a specified character box reference edge.

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