wow... :o i never about doing things like that in text mode (most likely because i can't! :lol: ) My favourite is rel's floormapping plasma, but binaryshock's rotozoomer isn't far behind... personally, i think rel's plasma and binaryshock's rotozoomer is better than most graphics ones.
unfortunately, my math skills are not quite up to par. i can give you one: one i found on the net a while back. remember, it's not mine. i just thought you guys would like to look at it. not quite as nice to look at as the rotozoomer or plasma though. oh, btw, don't exe it. it runs much too fast exe'd!!!
Code:
' rayasci1.bas version 1.01 by dieter marfurt
' version with &hffff& -multiplyer , poke-instead of line
' ,"peek-division" used to determine wall-height,
' and height-table.
' Just for fun: USES 80*50 TEXTMODE!!!
' this one is pretty fast but hard to read...
'
'use the numeric keys to navigate.
'you might replace the keyboardhandler - it really sucks now if not compiled
DIM a$(50)
FOR i% = 0 TO 50
a$(i%) = STRING$(80, CHR$(178))
NEXT i%
SCREEN 0: WIDTH 80, 50
DIM Grid%(13, 13)
DIM xxyyt&(500) ' divider-table
FOR i% = 0 TO 500
xxyyt&(i%) = &HFFFF& + 1
xxyyt&(i%) = xxyyt&(i%) * i%
NEXT i%
DIM hht%(1200)' height-table
FOR i% = 1 TO 1200 '-9000 80*
hht%(i%) = ((-3000& + (64& * (hh% + 150))) \ i%)' AND &HEFFF
NEXT i%
REDIM SHARED STable!(-192 TO 1992), CTable!(-192 TO 1992)
REDIM SHARED iSTable%(-192 TO 1992), iCTable%(-192 TO 1992)
PX& = 150000: PY& = 150000 ' start position
' init fast peek-division
XX& = 0: YY& = 0: txx2& = 0: tyy2& = 0
xxseg% = VARSEG(XX&)
yyseg% = VARSEG(YY&)
xxptr% = VARPTR(XX&) + 2
yyptr% = VARPTR(YY&) + 2
Stride2% = 3
Heading% = 980
Turn% = 30
FOR Y% = 1 TO 12
FOR X% = 1 TO 12
READ Grid%(X%, Y%)
NEXT
NEXT
Factor! = (ATN(1) * 8) / 1800
FOR a% = 0 TO 1799
Angle! = CSNG(a%) * Factor!
STable!(a%) = SIN(Angle!) * .1
CTable!(a%) = COS(Angle!) * .1
NEXT
FOR a% = 1800 TO 1800 + 192
STable!(a%) = STable!(a% - 1800)
CTable!(a%) = CTable!(a% - 1800)
NEXT
FOR a% = 0 TO -192 STEP -1
STable!(a%) = STable!(a% + 1800)
CTable!(a%) = CTable!(a% + 1800)
NEXT
FOR a% = -192 TO 1992
iSTable%(a%) = STable!(a%) * &HFFFF&
iCTable%(a%) = CTable!(a%) * &HFFFF&
NEXT a%
REDIM SHARED STable!(0), CTable!(0)
DO '.......... Main loop !!!!
z% = z% + 1
IF z% >= 100 THEN
z% = 0
t2# = 101 / (TIMER - t#)
t# = TIMER
END IF
aa% = INP(&H60)
a$ = INKEY$
IF aa% <> 0 THEN
IF aa% = 75 THEN 'turn left
Heading% = (Heading% + Turn%) MOD 1800
END IF
IF aa% = 77 THEN 'turn right
Heading% = (Heading% + (1800 - Turn%)) MOD 1800
END IF
IF aa% = 72 THEN 'walk forward
NewPX& = PX& - (iSTable%(Heading%) * Stride2%)
NewPY& = PY& - (iCTable%(Heading%) * Stride2%)
IF Grid%(NewPX& \ &HFFFF&, NewPY& \ &HFFFF&) = 0 THEN
PX& = NewPX&: PY& = NewPY&
ELSE 'tried to walk through a wall
SOUND 80, 1
END IF
END IF
IF aa% = 80 THEN 'walk back
NewPX& = PX& + (iSTable%(Heading%) * Stride2%)
NewPY& = PY& + (iCTable%(Heading%) * Stride2%)
IF Grid%(NewPX& \ &HFFFF&, NewPY& \ &HFFFF&) = 0 THEN
PX& = NewPX&: PY& = NewPY&
ELSE 'tried to walk through a wall
SOUND 80, 1
END IF
END IF
END IF
PALETTE 0, 0
GOSUB ComputeView
LOCATE 50, 20
PRINT "FPS: "; INT(t2#); " ";
LOOP UNTIL aa% = 1 'a$ = CHR$(27)
END '.. ......eo mainloop
ComputeView:
x1% = 0
FOR i% = 0 TO 49
a$(i%) = STRING$(80, "²")
NEXT i%
FOR a% = Heading% + 160 TO Heading% - 159 STEP -4
XX& = PX&: YY& = PY&
L% = 0
stepx% = iSTable%(a%) \ 5: stepy% = iCTable%(a%) \ 5
'***************************************************************************
DO 'raycaster
XX& = XX& - stepx%: YY& = YY& - stepy%
L% = L% + 2
xg% = PEEK(xxptr%)
yg% = PEEK(yyptr%)
k% = Grid%(xg%, yg%)
LOOP UNTIL k%
'***************************************************************************
DD% = hht%(L%)
ddasc% = DD% \ 3
IF ddasc% > 23 THEN ddasc% = 23
flasc% = 25 + ddasc%
rasc% = 24 - ddasc%
FOR i% = rasc% TO flasc%
MID$(a$(i%), x1% + 1, 1) = CHR$(32 + k%)
NEXT i%
x1% = x1% + 1
NEXT a%
LOCATE 1, 1
FOR i% = 1 TO 48
PRINT a$(i%);
NEXT i%
RETURN
' Level data for Grid%(,)
DATA 9, 1, 9, 1, 9, 1, 9, 1, 9, 1, 9, 1
DATA 1, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 9
DATA 9, 0, 2, 10, 0, 0, 0, 0, 0, 12, 0, 1
DATA 1, 0, 10, 2, 0, 0, 0, 0, 0, 4, 0, 9
DATA 9, 0, 0, 0, 0, 0, 0, 0, 0, 12, 0, 1
DATA 1, 0, 0, 0, 0, 7, 7, 0, 0, 0, 0, 9
DATA 9, 0, 0, 0, 0, 7, 7, 0, 0, 0, 0, 1
DATA 1, 0, 13, 0, 0, 0, 0, 8, 0, 12, 0, 9
DATA 9, 0, 5, 0, 0, 0, 0, 7, 0, 4, 0, 1
DATA 1, 0, 13, 0, 0, 0, 0, 8, 0, 12, 0, 9
DATA 9, 0, 5, 0, 0, 0, 0, 7, 0, 4, 0, 1
DATA 1, 9, 1, 9, 1, 9, 1, 9, 1, 9, 1, 9
