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     JF(9.1)                                                   JF(9.1)

          jf - font editor

          jf [ file ] ...

          Jf edits jerq font files.  If file does not begin with a
          slash and is not a font file, it is looked up in a standard
          font directory.

          Jf is mostly mouse- and menu-driven, except when prompting
          for file names.  Jf divides its layer into two types of
          areas: The font displays show all characters in a given font
          in actual size; when characters are opened for editing, they
          appear magnified in edit displays.

          Button 1
          is the `do it' button.  Clicking button 1 inside a font
          display opens a character for editing; inside an edit
          display it sets a pixel.  It may have other functions
          selected via menus, in which case the function is indicated
          by a special cursor.

          Button 2
          is the `undo it' button.  Clicking button 2 closes a charac-
          ter or clears a pixel, unless conditioned otherwise via menu

          Button 3
          is the `menu' button.  Clicking button 3 selects a menu,
          pops control back to the top level, or (when the gunsight
          cursor shows) picks a font or character to be affected.
          Sometimes menu selection is the only (non-trivial) option
          available, as indicated by a `menu' cursor.

          A font is described by several parameters; these are either
          read from the font file, or set by default by the make new
          font function: max width (default 16 pixels), height
          (16)-measured from the top, ascent (16)-the distance of the
          printing baseline from the top, and range (1)-the highest-
          numbered character in the font.  (The first character is
          numbered 0.)  All may be changed under the set sizes menu.
          Squeeze font, in the open/close font menu, reduces max width
          as much as possible.

          Each character has a width, which is shown by the length of
          the baseline in the edit display.  Char width may be set
          under the set sizes menu; button 1 sets it to 0, button 2
          sets it to a specified pixel within the max width.  Char

     JF(9.1)                                                   JF(9.1)

          left may be used for kerning; if made positive, it shifts a
          character right and causes max width to increase if neces-
          sary; if negative, the character will be shifted left. Oth-
          erwise char left is irrelevant to font editing.

          The bit function menu controls copying among characters in
          any of the bitblt(9.3) Codes, F_STORE, F_CLR, F_OR, or
          F_XOR.  Press button 3 on the source character; hold it down
          while moving and release it on the destination.

          Several fonts may be open at once.  When editing a font, it
          is often convenient to open a second copy for recovering
          botched characters.

          /usr/jerq/font/*         jerq fonts
          /usr/jerq/include/font.h jerq font header file

          The most common problem is running out of memory or screen
          area, in which case the offending operation is simply
          ignored.  A small number of self-explanatory messages deal
          with errors on file I/O.