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                                                   400
      CHAPTER 5                                                                        Text



5.2.3 Horizontal Scaling

      The horizontal scaling parameter, Th , adjusts the width of glyphs by stretching or
      compressing them in the horizontal direction. Its value is specified as a percent-
      age of the normal width of the glyphs, with 100 being the normal width. The scal-
      ing always applies to the horizontal coordinate in text space, independently of the
      writing mode. It affects both the glyph’s shape and its horizontal displacement
      (that is, its displacement vector). If the writing mode is horizontal, it also affects
      the spacing parameters Tc and Tw, as well as any positioning adjustments per-
      formed by the TJ operator. Figure 5.8 shows the effect of horizontal scaling.



             Th = 100 (default)
                                                         Word
             Th = 50
                                                         WordWord
                                     FIGURE 5.8 Horizontal scaling


5.2.4 Leading

      The leading parameter, Tl , is measured in unscaled text space units . It specifies
      the vertical distance between the baselines of adjacent lines of text, as shown in
      Figure 5.9.



                                        This is 12-point text with
                                        14.5-point leading

                                  Leading


                                            FIGURE 5.9 Leading


      The leading parameter is used by the TD, T*, ', and " operators; see Table 5.5 on
      page 406 for a precise description of its effects. This parameter always applies to
      the vertical coordinate in text space, independently of the writing mode.

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