2 DECLARE SUB updateland ()
3 DECLARE SUB makeland ()
4 DECLARE FUNCTION getcol! (r!, g!, b!)
6 DECLARE SUB traceline (x%, y%, xl)
7 DECLARE SUB dispframe ()
8 DECLARE SUB tower (x%, y%)
9 DECLARE SUB square (x1%, y1%, x2%, y2%, c%, h%)
10 DECLARE SUB displand ()
12 DECLARE SUB setupal ()
14 DIM SHARED landh(0 TO 180, 0 TO 180)
15 DIM SHARED landc(0 TO 180, 0 TO 180)
17 DIM SHARED zmyx, zmyy, zmyz
18 DIM SHARED myx, myy, myz
19 DIM SHARED zmyan, myan2
20 DIM SHARED ste, stem, dist
21 DIM SHARED tim$, frm, frmrate
25 sky = getcol(100, 100, 255)
28 frmrate = 10 ' Desired framerate.
29 ' Lower framerate, better quality
37 OPEN "cat.i01" FOR INPUT AS #1
47 x2 = x1 + RND * 10 + 1
48 y2 = y1 + RND * 10 + 1
50 IF (frm > 50) AND (frm < 250) THEN square x1, y1, x2, y2, RND * 200, RND * 10
51 IF (frm > 250) AND (picty < 177) THEN
55 landc(pictx, picty) = c
56 landh(pictx, picty) = 0
58 IF pictx >= pictxw THEN pictx = 0: picty = picty + 1
59 IF picty >= pictyw THEN picty = 0
63 IF frm = 430 THEN dispimg
76 FOR z = .5 TO -.5 STEP zst
77 traceline SIN(zmyan + z) * dist + myx, COS(zmyan + z) * dist + myy, l
88 OPEN "cat.i01" FOR INPUT AS #1
92 FOR y = 0 TO pictyw - 1
93 FOR x = 0 TO pictxw - 1
95 PSET (x + 50, 150 - y), c
114 IF z > 120 THEN zs = .7
115 IF z > 160 THEN zs = .6
116 FOR zx = 0 TO 180 STEP zs
117 y1 = landh(zx, z) - 80
123 LINE (zx2 + 160, 40 - zy2)-(zx2 + 160, 200), landc(zx, z)
128 PRINT "Press any key to continue..."
133 FUNCTION getcol (r, g, b)
137 IF r > 255 THEN r = 255
138 IF g > 255 THEN g = 255
139 IF b > 255 THEN b = 255
140 getcol = INT(r / 43) * 36 + INT(g / 43) * 6 + INT(b / 43)
146 square 0, 0, 180, 180, 15, 0
154 landc(x, y) = getcol(250, 250, 250)
156 landc(x, y) = getcol(250, 50, 50)
163 v = SQR((ABS(50 - y)) ^ 2 + (ABS(130 - x)) ^ 2)
164 h = SQR((60 - v) * (60 + v)) - 35
165 IF h > 0 THEN landh(x, y) = h
174 FOR za = 0 TO 20 STEP .1
175 x = SIN(za) * (1 + (za * 2)) + 100
176 y = COS(za) * (1 + (za * 2)) + 100
177 landc(x, y) = getcol(20, RND * 200, 20)
178 landc(x + 1, y) = getcol(20, RND * 200, 20)
179 landc(x, y + 1) = getcol(20, RND * 200, 20)
180 landc(x + 1, y + 1) = getcol(20, RND * 200, 20)
200 SUB square (x1, y1, x2, y2, c, h)
213 'PRINT "please wait..."
231 FOR a = 10 TO 0 STEP -1
232 square x - a, y - a, x + a, y + a, getcol(100, 0, a * 20), 20 - a
235 square x - 11, y - 11, x - 9, y - 9, getcol(255, 0, 0), 20
236 square x + 9, y - 11, x + 11, y - 9, getcol(0, 255, 0), 20
237 square x - 11, y + 9, x - 9, y + 11, getcol(0, 0, 255), 20
238 square x + 9, y + 9, x + 11, y + 11, getcol(255, 255, 0), 20
243 SUB traceline (x, y, xl)
246 zpr = myx / (myx - x)
248 y = myy - ((myy - y) * zpr)
252 zpr = myy / (myy - y)
254 x = myx - ((myx - x) * zpr)
258 zpr = (180 - myx) / (x - myx)
260 y = myy - ((myy - y) * zpr)
264 zpr = (180 - myy) / (y - myy)
266 x = myx - ((myx - x) * zpr)
269 lp = SQR(ABS(myx - x) ^ 2 + ABS(myy - y) ^ 2)
277 cx = xp * a / lp + myx
278 cy = yp * a / lp + myy
279 yn = myan2 - ((landh(cx, cy) - myz) * 300) / a
280 IF yn < yo THEN LINE (xl, yn)-(xl + stem, yo - 1), landc(cx, cy), BF: yo = yn
282 LINE (xl, yo - 1)-(xl + stem, 0), sky, BF
293 zmyan = frm / 15 + pi
295 'zmyx = SIN(zmyan) * 3 + zmyx
296 'zmyy = COS(zmyan) * 3 + zmyy
299 zmyx = 90 - SIN(zmyan) * 91
300 zmyy = 90 - COS(zmyan) * 91
302 IF zmyx > 170 THEN zmyx = 170
303 IF zmyy > 170 THEN zmyy = 170
304 IF zmyx < 10 THEN zmyx = 10
305 IF zmyy < 10 THEN zmyy = 10
307 zmyz = SIN(zmyan / 2) * 4 + 4
308 zmyz = SIN(zmyan / 2) * 50 + 50
309 myan2 = -SIN(zmyan / 2) * 120 + 121
310 myan2 = -(SIN(zmyan / 2) * 10 + 10)
311 IF zmyz < landh(myx, myy) + 10 THEN zmyz = landh(myx, myy) + 10: zmyzs = (zmyzs / 2) + .2