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Z80 & 68k Assembly =>
z80 & ez80 Assembly
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Tyraniek
Member
Joined: 07 Jun 2003
Posts: 133
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 Posted: 21 Jun 2003 09:24:53 am Post subject: |
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How is it that I can test a pixel correctly with IPoint 3 with Virtual TI, and that I can't do it at all on my calculator ????????? The program runs as if I didn't test the pixel....  |
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Job the GameQuitter
Member
Joined: 04 Jun 2003
Posts: 102
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| Posted: 21 Jun 2003 10:40:41 am Post subject: |
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I advise agains using IPoint period. Try this, it's one of the Ion routines:
Code:
;-----> Get pixel information
; input: e=y coordinate
; a=x coordinate
; output: a holds data for pixel (e.g. %00100000)
; hl->byte where pixel is on the gbuf
getPixel:
ld d,$00
ld h,d
ld l,e
add hl,de
add hl,de
add hl,hl
add hl,hl
ld de,gbuf
add hl,de
ld b,$00
ld c,a
and %00000111
srl c
srl c
srl c
add hl,bc
ld b,a
inc b
ld a,%00000001
getPixelLoop:
rrca
djnz getPixelLoop
ret
Note: this tests the pixel in plotSScreen, which doesn't have to coincide with the screen, depending on which routines you use. If you know how to write directly to the LCD you could modify this routine to test the pixel on screen quite easily.
Last edited by Guest on 21 Jun 2003 10:42:49 am; edited 1 time in total |
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