Loadstar 234/234.d81/t.fontstar

Text File | 2022-08-26 | 4KB | 201 lines

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           F O N T S T A R
           by Dave Moorman


    As mentioned elsewhere, sometimes
one must build tools in order to build
tools. The Golem Editor became a case
in point. I needed an ML module to
display and manipulate the font. It
turned out to be exactly 1024 bytes in
size, and I figured some of you might
enjoy having it in your arsenal of
WMDs (Welcomed Modules of Design).

    I have included two versions, FONT
192.ML and FONT 156.ML. The number
indicates the page to which the file
is BLOADED. For example:

 SYS57812"FONT 192.ML",DV,0
 POKE 780, 0
 POKE 781, 0
 POKE 782, 192 :REM PAGE!
 SYS65493

 The beginning address (AD below) is

 AD = 192 * 256


FONT DISPLAY:
  SYS AD,ADDR,SCRROW
    ADDR = Memory Address where Font
           resides.
    SCRROW = Screen Row (0 - 17) where
           first line of Font is
           displayed.

    This command MUST be given first,
since it tells FontStar where in
memory (ADDR) your font resides, and
where on the screen to display the
font and edit box. The command puts a
32 x 8 Font display on the screen,
with an 8 x 8 edit window.


EDIT:
  SYS AD+3,SC
    SC = Screen Code

    This command puts the character of
    SC in the edit window. It is also
    called by other commands after
    they do their work on a character.


CLEAR:
  SYS AD+6,SC

    Turns off all pixels of character
    SC.


REVERSE:
  SYS AD+9,SC

    Flips all pixels of character SC.

    Use CLEAR and REVERSE to turn on
    all pixels.


SCROLL UP:
  SYS AD+12,SC

    Scrolls the pixels of character SC
    up one pixel row.


SCROLL DOWN:
  SYS AD+15,SC

    Scrolls the pixels of character SC
    down one pixel row.


SCROLL RIGHT:
  SYS AD+18,SC

    Scrolls the pixels of character SC
    right one pixel column.


SCROLL LEFT:
  SYS AD+21,SC

    Scrolls the pixels of character SC
    left one pixel column.


TWIST LEFT:
  SYS AD+24,SC

    Twists the pixels of character SC
    90 degrees counter-clockwise.


TWIST RIGHT:
  SYS AD+27,SC

    Twists the pixels of character SC
    90 degrees clockwise.


FLIP VERTICALLY:
  SYS AD+30,SC

    Turns character SC upside down.


FLIP HORIZONALLY:
  SYS AD+33,SC

    Makes mirror image of character
    SC.


COPY:
  SYS AD+36,FROM,TO
    FROM = Screen Code of character to
           be copied.
    TO = Screen Code of character to
         receive copy.

    Makes character TO look like
    character FROM.


ROW TO BUFF:
  SYS AD+39,ROW
    ROW = Thirty-two character Font
          Row as displayed.

    Copies all 32 characters of ROW
    into a buffer.


BUFF TO ROW:
  SYS AD+42,ROW

    Copies all 32 characters of buffer
    into ROW.

    The BUFFER commands are extremely
    useful for copying parts of one
    font to another.


TOGGLE:
  SYS AD+45,SC,CX,CY
    SC = Screen Code
    CX = Cell X-coordinate.
    CY = Cell Y-coordinate.

    This is the pixel edit command for
    FontStar. The coordinates are
    actual screen character cell
    coordinates. This makes it easy to
    use FontStar with Mr. Mouse! When
    you call ASK BASIC (SYS MM+9), the
    character cell coordinates of the
    mouse arrow are returned in CX%
    and CY%. All you need to do to
    toggle one of the pixels in the
    edit box is point and click. Here
    is the BASIC code:

(SC holds screen code of character
being edited. RO is the screen row
where the first row of the Font is
displayed.)

 900 REM DEFINE REGION 1 AS THE PIXEL
    EDIT BOX
 901 SYS MM+15, 1, 32, 39, RO, RO+7

 999 REM MAIN LOOP...
1000 SYS MM+9
1010 IF RG% = 1 THEN
    SYS AD+45, SC, CX%, CY%


    I think this pretty well covers
it! Now let us see your Font Editor
utilities!

 DMM