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Z80 & 68k Assembly =>
z80 & ez80 Assembly
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MaxVT103
Member
Joined: 24 Aug 2003
Posts: 109
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 Posted: 02 Sep 2003 08:33:16 pm Post subject: |
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Ok, I've decided to simplify the detection routine so if anyone could help me fix the code, I'd be greately apreciative.
Code:
;----------Hot spot detection-----------
;inputs b,c (first x and y cor)
;inputs d,e(Width of box "d";Height of box "e")
;inputs h,l("h" x cor to check, "l" y cor to check
;output "a"(either on or off)
detect:
ld a,b
add a,d
ld d,a
ld a,c
add a,e
ld e,a
detect_x1:
ld a,b
cp h
jp z,detect_x2
cp h
jp p,detect_x2
ld a,d
cp h
jp z,detect_x2
cp h
jp m,detect_x2
jp no_detect
detect_x2:
ld a,c
cp l
jp z,detect_y
cp l
jp p,detect_y
ld a,e
cp l
jp z,detect_y
cp l
jp m,detect_y
jp no_detect
detect_y:
ld a,1
ret
no_detect:
ld a,0
ret
I hope someone can help, mainly bc the jp p,xxx and jp m,xxx confuse me while coding.
Donald |
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Adm.Wiggin
aka Tianon
Know-It-All
Joined: 02 Jun 2003
Posts: 1874
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| Posted: 02 Sep 2003 09:30:02 pm Post subject: |
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look in 83pa28d at the day in which it talks about jumps.
it talks about how to do conditions, and how to do AND and OR as conditions... |
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MaxVT103
Member
Joined: 24 Aug 2003
Posts: 109
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| Posted: 03 Sep 2003 10:31:01 pm Post subject: |
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Ok, I got bored after I got home from football practice and felt like working on hitz. So I started working on the routine again and finaly got it to work. So I guess I was smart enough to write it, yippie. So for all of you who read this and just want an easy way out of writing the code youself. I'm gonna paste it here for you so you can use it in your programs too. Please just give me credit for it bc it took 2 hours to get working.
Code:
;----------Hot spot detection-----------
;-----------By Donald Ritter------------
;inputs b,c (first x and y cor)
;inputs d,e(Width of box "d";Height of box "e")
;inputs h,l("h" x cor to check, "l" y cor to check
;output "a"(either on or off)
hdetect:
ld a,b
add a,d
ld d,a
ld a,c
add a,e
ld e,a
hdetect_x1:
ld a,b
cp h
jp z,hdetect_x2
cp h
jp m,hdetect_x2
jp hno_detect
hdetect_x2:
ld a,d
cp h
jp z,hdetect_y1
cp h
jp p,hdetect_y1
jp hno_detect
hdetect_y1:
ld a,c
cp l
jp z,hdetect_y2
cp l
jp m,hdetect_y2
jp hno_detect
hdetect_y2:
ld a,e
cp l
jp z,hdetected
cp l
jp p,hdetected
jp hno_detect
hdetected
ld a,1
ret
hno_detect:
ld a,0
ret
I do realize that many people have probobly written a routine similar to this. But heres my shot at it so hope you enjoy.
Donald |
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