ASCII Graphics Challenge! :P

[ravenxau]

here is an ascii raycaster with texture mapping for anyone who wants to make a 3d game with it.

Cheers, Matt

Code:

'   Ascii Ray Caster with texture mapping
'   Using Integer Mathematics for speed    Clu 5-7-03      Qbasic 1.1
'
DEFINT A-Z: DIM l(16, 16), c(360), s(360), t(16, 16)
FOR y = 1 TO 16
READ l$
FOR x = 1 TO 16
l(x, y) = VAL(MID$(l$, x, 1))
NEXT x
NEXT y
FOR y = 1 TO 16
READ l$
FOR x = 1 TO 16
t(x - 1, y) = VAL(MID$(l$, x, 1))
NEXT x
NEXT y

FOR t = 0 TO 360
s(t) = 100 * SIN(22 / 7 * t / 180)
c(t) = 100 * COS(22 / 7 * t / 180)
NEXT t

x = 5600: y = 4000: f = 0: SCREEN 0: WIDTH 80, 50
DEF SEG = &HB800

main:
FOR s = -40 TO 39: a$ = INKEY$
r = f + (s * 60 \ 80): r = r + 360 * ((r > 360) - (r < 0))
r = r - (c(r) = 0): xi = c(r): yi = s(r): x1 = x: y1 = y:
wallcheck:
x1 = x1 + xi: y1 = y1 + yi
IF l(x1 \ 1600, y1 \ 1600) = 0 THEN GOTO wallcheck

xint = ABS(x1 - INT((x1 + 800) \ 1600) * 1600)
yint = ABS(y1 - INT((y1 + 800) \ 1600) * 1600)
IF xint > yint THEN tc = (x1 - (((x1 \ 1600)) * 1600)) \ 100
IF yint > xint THEN tc = (y1 - (((y1 \ 1600)) * 1600)) \ 100

d = (ABS((x - x1) \ c(r)) * c(ABS(r - f))) * .01
h = (69 * 16 \ d) \ 2
FOR ys = 0 TO 49
addr = (s + 40) * 2 + (ys * 160): POKE addr, 178
IF ys > 25 - h AND ys < 25 + h THEN POKE addr + 1, t(tc, INT(ys - (25 - h)) / (h * 2) * 16)
IF ys > 24 + h THEN POKE addr + 1, 2
IF ys <= 26 - h THEN POKE addr + 1, 9

NEXT ys
NEXT s

k = INP(96): f = f + 5 * (k = 75) - 5 * (k = 77)
f = f - 355 * (f = -5) + 360 * (f = 365)
dx = c(f) * (-(k = 72) + (k = 80)): dy = s(f) * (-(k = 72) + (k = 80))
IF l((x + dx) \ 1600, (y + dy) \ 1600) = 0 THEN x = x + dx: y = y + dy
IF INP(96) = 1 THEN SYSTEM ELSE GOTO main

DATA "1111111111111111"
DATA "1000010000010011"
DATA "1000000111110001"
DATA "1000010010000001"
DATA "1111111010000001"
DATA "1000001011101111"
DATA "1000001000000001"
DATA "1000000011100001"
DATA "1000001010000001"
DATA "1111111011100111"
DATA "1000001000000001"
DATA "1000101101001001"
DATA "1000000101011101"
DATA "1001000000001001"
DATA "1000000100000001"
DATA "1111111111111111"

DATA "8666666686666666"
DATA "8666666686666666"
DATA "8666666686666666"
DATA "8888888888888888"
DATA "6666866666668666"
DATA "6666866666668666"
DATA "6666866666668666"
DATA "8888888888888888"
DATA "8666666686666666"
DATA "8666666686666666"
DATA "8666666686666666"
DATA "8888888888888888"
DATA "6666866666668666"
DATA "6666866666668666"
DATA "6666866666668666"
DATA "8888888888888888"