🚀 go-pugleaf

Disclaimer - this is out of a book - I have never tried it and may be 
misinterpreting it.

There are two functions relating to setting the cursor.  The first is 
for the graphics cursor.

AX: 09H
BX: horizontal hot spot (-16 - 16)
CX: vertial hot spot (-16 - 16)
DX: offset of pointer to screen/cursor masks.

the cursor is a 32bit by 32bit box, and the hotspot determines the 
point within the box used for clicking.  For example, a cursor in the 
shape of a + would have the hotspot directly in the middle (0,0).  But 
a cursor in the shape of an arrow pointing up would have the hotspot 
at the arrow tip (0,-16).

The screen/cursor mask is defined as 32 64 bit words where every bit 
pair is a combination of screen and cursor masks.  Each word 
represents 32 points on the cursor line.  The screen/cursor mask 
combinations have the following effects:

     SCREEN    CURSOR    RESULT
        0         0         0           (bit turned off)
        0         1         1           (bit turned on)
        1         0      unchanged      (bit remains the same)
        1         1      inverted       (original bit is inverted)

To my knowledge, there is no way to set color on the graphics cursor.

The second function is for the text cursor.

AX: 0AH
BX: cursor type (0 = software  1 = hardware)
CX: screen mask/start scanline
DX: cursor mask/end scanline

The software cursor acts independently of the text cursor so that both 
may be on the screen at once.  The hardware cursor replaces the text 
cursor and text cursor functions replect the mouse cursor position.

If using the software cursor type, then the screen and cursor masks 
reflect the cursor characteristics.  If the screen mask is 77FFH, the 
cursor is a see-through block.  If the screen mask is 0000H, the 
cursor is a specially defined character.

The cursor mask places the attributes in the upper byte, and the 
character in the lower byte as follows:

     BIT       CHARACTERISTIC
     15        blink control (1 is blinking, 0 is not)
     12-14     3 bit background color (0-7)
     11        Intensity control (1 is high intensity, 0 is normal)
     8-10      3 bit foreground color (0-7)
     0-7       8 bit character ascii code

If using the hardware cursor type, the starting and ending scanlines 
are used (just like the normal cursor).  Normally, the start scanline 
would be 0 and the top scanline would be 12 for mono and 7 for color.

I would recommend looking at the manual that came with your mouse, or 
looking for a detailed book on programming mice, windows, menus, ect.

     David Deitch (GIS)
          deitch@gisatl.fidonet.org
               1:133/411@fidonet
                    18:716/411@keshernet 


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