# Centipede game demo # Based on the popular Atari arcade game. # I wrote this clone originally as an # interactive ASCII-based video game in # DEC BASIC-Plus-2 under RSTS/E on a # PDP-11/70 to run on ANSI video terminals # (VT-100, VT-220). Later I converted it # into BASIC-11 to run in RT-11 on a # PDP-11/05 with a Heath/Zenith HZ-19 # kit video monitor (DEC VT-52 clone) # assembled by my mother. # # 14-MAR-21 -- 17-APR-21 # For this demo on SoloLearn I converted and # merged both codes into Python and added automatic # play. Also I enhanced animations of the splash # screen, the centipede, spider movement, and the # >ZAP<. Then I put much effort into optimizing # so it would run consistently within the run-time # limit that SoloLearn imposes. # And I squashed a few bugs. O,o #import time import random import os os.system('pip install -qqq --disable-pip-version-check Pillow') from PIL import Image, ImageDraw #st = time.process_time() W = 80 H = 25 scrn = [[" "]*W for i in range(H + 1)] CLS = " "*W ub1 = 17 ub2 = ub1 - 3 ldr = "@" flr = ")(" you = "A" wall = 5 #Print string at screen coordinate offs = 28 def printat(x, y, st): global scrn y += offs for c in st: scrn[x][y] = c y += 1 return #Make an animation frame. #dtl = st #dth = 0 #dt = st #lt = st def printscreen(): global frames #, dt, dtl, dth, lt img = Image.new("L", (400, 240), color = 0) d = ImageDraw.Draw(img) x = 0 for textrow in scrn: #print(''.join(textrow)) d.text((0, x), "".join(textrow), 250) x += 8 frames.append(img) return #dt = lt #lt = time.process_time() #dt = lt - dt #if dtdth: dth = dt #return ##if len(frames)>=980: #if time.process_time()>=2.2: # k0 = 0 # d0 = -1 # k += 1 # printat(H, 1, "Demo time limit") #return #Add delay by duplicating the last saved frame n times def dupnframes(n): global frames frame = frames[len(frames) - 1] for _ in range(n): frames.append(frame) return #Final display output before exit. def finaldisplay(): frames[0].save('CentiMental.png', \ format='gif', \ save_all=True, \ append_images=frames,\ optimize=True, \ duration=125, loop=0) #print("FPS avg:", len(frames)//time.process_time(), "lo:", 1//dth, "hi:", 1//dtl) return #Centipede movement #vp[] vertical positions of bug parts #vpi saved vertical position of relative leader part #hp[] horizontal positions of bug parts #hpi saved horizontal position of relative leader part #hv[] horizontal vectors of bug parts #vv[] vertical vectors of bug parts def hundredfoot(i): global vp, vpi, hp, hpi, hv, vv, d0, k, k1 if at[i]>0: #follower v1 = vpi h1 = hpi vpi = vp[i] hpi = hp[i] vp[i] = v1 hp[i] = h1 #erase only if at tail of centipede if at[i + 1]<=0: printat(vpi, hpi, mush[mat[vpi][hpi]]) printat(v1, h1, flr[(h1 + i)&1]) else: #leader vpi = vp[i] hpi = hp[i] h1 = hpi + hv[i] if mat[vpi][h1]==0 and scrn[vpi][h1 + offs] in (' ', you, '|') and ap[i]==0 and 0<=h1<=24: #give horizontal movement priority unless poisoned v1 = vpi hp[i] = h1 else: v1 = vpi + vv[i] if v1>=H - 2: ap[i] = 0 hv[i] = -hv[i] if mat[v1][hpi]==wall: vv[i] = -vv[i] v1 = vpi + vv[i] #Reached the bottom. Bring out a zombiepede leader. for j in range(1, 13): if at[j]==0: at[j] = -1 ap[i] = 0 RS = (random.randint(0, 1) and 22) #L=0, R=22 hp[j] = 1 + RS vp[j] = ub1 vv[j] = 1 hv[j] = 1 - (RS and 2) #1 or -1 k1 -= 1 break elif vpi==ub1 and vv[i]<0: vv[i] = -vv[i] v1 = vpi + vv[i] elif mat[vpi][h1]>wall: ap[i] = -1 vp[i] = v1 printat(vpi, hpi, mush[mat[vpi][hpi]]) printat(vp[i], hp[i], ldr) if hp[i]==Yh and vp[i]==Yv: #Centipede got you bzzapp(Yv, Yh) return #User Input e = chr(128) #keyboard fire button #Input direction keys based on keypad layout UL = '7' U = '8' UR = '9' L = '4' C = '5' R = '6' DL = '1' D = '2' DR = '3' def makebugspray(): global d, fv, fh, f, lastinp if d0: return if fsc: inp = L if sch - Yh + schv*(Yv - scv - schv)//20 else (R, DR, UR)[rnd] inp += e + e elif fl: inp = DL if flhYh else (e + D + e if ((f and fh!=flh) or flv>=ub2) else e + U + e + e + e + e)) elif rpeat: inp = lastinp + e + e else: for row in range(23, 1, -1): for c1, c2 in zip(range(Yh, max(Yh - 6, 0), -1), range(Yh + 1, min(Yh + 6, 23) + 1)): if mat[row][c1]: inp = DL if c1flv and v1<=(flv + flvv))): #Bumped into a flea fl = 0 sc += 200 bzzapp(Yv, Yh) updscore() return if fsc and v1<=scv<=Yv and abs(Yh - sch)<=1: #Bumped into a scorpion fsc = 0 h1 = 1000 sc += h1 bzzapp(Yv, Yh) printat(Yv, Yh, mush[mat[fv][fh]]) printat(scv, sch - 1, str(h1)) printscreen() dupnframes(1) for i in range(sch - 1, sch + 3): printat(scv, i, mush[mat[scv][i]]) updscore() return #Firing - let the... def firefly(): global f, fl, mat, sc, fs, fsc, fh, fv, k1, flvv h1 = mat[fv][fh] v1 = fv - 1 nohit = (scrn[fv][fh + offs]=="|") if nohit: printat(fv, fh, ' ') if (not nohit) or scrn[v1][fh + offs]!=' ': if fs and v1<=sv<=fv and abs(fh - sh)<=1: #Shot a spider f = fs = 0 risk = Yv - sv h1 = (300, 600, 900)[((risk<5) + (risk<3))] sc += h1 #printat(fv, fh, " ") printat(sv, sh - 1, str(h1)) printscreen() dupnframes(1) for i in range(sh - 1, sh + 2): printat(sv, i, mush[mat[sv][i]]) updscore() return if fl and fh==flh and (v1<=flv<=fv or (fv>flv and v1<=(flv + flvv))): #Shot a flea f = 0 printat(flv, flh, mush[mat[flv][flh]]) flvv = (flvv + 1) % 3 if flvv==0: #Killed a flea fl = 0 sc += 200 updscore() return if fsc and v1<=scv<=fv and abs(fh - sch)<=1: #Shot a scorpion f = fsc = 0 h1 = 1000 sc += h1 printat(fv, fh, mush[mat[fv][fh]]) printat(scv, sch - 1, str(h1)) printscreen() dupnframes(1) for i in range(sch - 1, sch + 3): printat(scv, i, mush[mat[scv][i]]) updscore() return for i in range(1, 13): if at[i] and fh==hp[i] and v1<=vp[i]<=fv: #Shot a centipede k1 += 1 mat[vp[i]][hp[i]] = 4 printat(vp[i], hp[i], mush[4]) f = at[i] = 0 sc += 30 updscore() j = i + 1 if at[j]: at[j] = -1 hv[j] = hv[i] vv[j] = vv[i] printat(vp[j], hp[j], ldr) return h1 = mat[v1][fh] if h1 not in (0, wall): #Shot mushroom f = 0 sc += h1%wall h1 -= 1 if h1==wall: h1 = 0 mat[v1][fh] = h1 printat(v1, fh, mush[h1]) updscore() return f &= (v1>0) if f: fv = v1 printat(fv, fh, "|") return #Flea Fall Pfl = 0.022 #Probability of flea appearance Pmsh = 0.3 #Probability of spawning a mushroom def fleafall(): global f, fl, flv, lvl, flh, mat, flvv, fs, sc if fl==0: if lvl<=1: return #If lower screen is clear, send a flea to drop mushrooms. for row in range(ub1, 24): if mat[row].count(0)<24: break #Found at least one mushroom. Stop checking. else: fl = True #Otherwise, randomly send a flea. fl |= (random.random()60000) flv = 0 flh = random.randint(1, 23) if 00): mat[flv][flh] = 4 #Drop a mushroom here printat(flv, flh, mush[mat[flv][flh]]) v1 = flv + flvv if f and flh==fh and flv<=fv<=v1: #Flea hit the shot. Advance to next speed. f = 0 printat(fv, fh, mush[mat[fv][fh]]) flvv = (flvv + 1)%3 #Flea speed cycle is 1, 2, 0, ... if flvv==0: #This was the second hit. The flea is dead. fl = 0 sc += 200 printat(flv, flh, mush[mat[flv][flh]]) updscore() return if mat[v1][flh]>wall: flvv = 2 #poisoned by mushroom if fs and (flv<=sv<=v1) and abs(flh - sh)<=1: #Flea hit a spider. You get consolation points. fl = fs = 0 h1 = 300 sc += h1 + 200 printat(flv, flh, mush[mat[flv][flh]]) #Show the bonus points printat(sv, sh - 1, str(h1)) printscreen() dupnframes(1) for i4 in range(sh - 1, sh + 2): printat(sv, i4, mush[mat[sv][i4]]) updscore() return if flh==Yh and flv<=Yv<=v1: #Flea ran into you fl = 0 bzzapp(Yv, Yh) return if v1>23: #End of flea fall. fl = 0 return flv = v1 printat(flv, flh, "#") return #Scorpion taunt Psc = 0.011 #probability of scorpion appearing Psc2 = Psc/2.0 #50% of Psc, used to select randomized horizontal direction def scorpoison(): global fsc, scv, lvl, sch, mat, schv, anim anim = not anim if fsc==0: #Randomly send a scorpion if random.random()>=Psc or lvl<=1: return fsc = -1 scv = random.randint(1, ub1) schv = 1 - (random.randint(0, 1) and 2) #either 1 or -1 #Poison any mushrooms in the starting position. if schv>0: sch = 2 for j in range(1, 4): if 0") return if scv==Yv and abs(sch - Yh)<2: #Scorpion ran into you. fsc = 0 bzzapp(Yv, Yh) return if anim: #move forward every other time slice h1 = sch + schv #Check whether the scorpion is headed off the field. #Do final mushroom poisoning and then erase scorpion. if h1<2 : fsc = 0 for j in range(1, 4): if 021: fsc = 0 for j in range(21, 24): if 00: j = sch + 1 if anim and 0", "Y_>", "T_|")[(sch + anim)&3] + (sch<22)*mush[mat[scv][sch + 2]]) return #bugzapped def bzzapp(x, y): global d0, k if d0: return #Prevent multiple entries d0 = -1 k += 1 y -= 2 xM1 = x - 1 xP1 = x + 1 printscreen() initframe = len(frames) - 1 printat(xM1, y, "\\ | /") printat(x, y, "-ZAP-") printat(xP1, y, "/ | \\") #for i in range(1, 13): # if at[i]: # hundredfoot(i) #centipede if f: firefly() if fl: fleafall() if fs: spidance() if fsc: scorpoison() printscreen() printat(xM1, y, ".\\./.") printat(x, y, "=ZAP=") printat(xP1, y, "'/\"\\`") #for i in range(1, 13): # if at[i]: # hundredfoot(i) #centipede if f: firefly() if fl: fleafall() if fs: spidance() if fsc: scorpoison() printscreen() printat(xM1, y, "\\ | /") printat(x, y, "~ZAP~") printat(xP1, y, "/ | \\") #for i in range(1, 13): # if at[i]: # hundredfoot(i) #centipede if f: firefly() if fl: fleafall() if fs: spidance() if fsc: scorpoison() printscreen() printat(xM1, y, " "*5) printat(x, y, " ZAP ") printat(xP1, y, " "*5) #for i in range(1, 13): # if at[i]: # hundredfoot(i) #centipede if f: firefly() if fl: fleafall() if fs: spidance() if fsc: scorpoison() printscreen() #for i in range(1, 13): # if at[i]: # hundredfoot(i) #centipede if f: firefly() if fl: fleafall() if fs: spidance() if fsc: scorpoison() printscreen() printat(xM1, y, " "*5) printat(x, y, " "*5) printat(xP1, y, " "*5) for i in range(1, 13): if at[i]: hundredfoot(i) #centipede if f: firefly() if fl: fleafall() if fs: spidance() if fsc: scorpoison() printscreen() return #Returns -1, 0, 1 according to sign of (a - b). def sgn(a, b = 0): return int(a>b) - int(a=Ps: return fs = -1 sv = random.randint(ub2, 23) sh = 1 + (rnd>=Ps2 and 22) #1 or 23 shv = sgn(2, sh) #1 or -1 rnd = random.random() h1 = sh + (rnd>Pshv and shv) #either sh or sh + shv v1 = sv + 1 - (rnd>=Pshv2 and 2) #either sv + 1 or sv -1 mat[sv][sh] = 0 #Spider eats mushrooms. while v1>=24 or v1<=ub2: v1 = sv + 1 - (random.randint(0, 1) and 2) for j in range(sh - 1, sh + 2): printat(sv, j, mush[mat[sv][j]]) if v1==Yv and abs(h1 - Yh)<2: #Spider ran into you. fs = 0 bzzapp(Yv, Yh) return if h1>22 or h1<2: #Spider left the field. fs = 0 return #Show the spider in its new position. sh = h1 sv = v1 printat(sv, sh - 1, ("<^>", "/^\\")[t]) t = ~t return #who dunnit def splatscreen(): global hv, Yv, Yh, mat, offs, at, vp, vv, hp, flr, ldr #Prevent collision with you during title animation. Yv = 23 Yh = 12 #Save original centipede characters to restore later. savoffs = offs savldr = ldr savflr = flr offs = 21 #set 25% (i.e., 18) random barriers (1<=x<=4, 3<=y<=20) for _ in range(18): mat[random.randint(1, 5)][random.randint(4, 20)] = -1 #Ensure a path that always leads to the title position. for i in range(1, 7): mat[i][0] = mat[i][1] = mat[i][2] = mat[i][3] = mat[i][20] \ = mat[i][21] = mat[i][22] = mat[i][23] = mat[i][24] = wall mat[5][21] = mat[6][2] = wall for i in range(3, 21): mat[5][i] = mat[6][i] = 0 #Initialize centipede followers. for i in range(2, 11): at[i] = vv[i] = vp[i] = 1 hp[i] = 19 - i - i hv[i] = -2 #Initialize centipede leader. at[1] = -1 vp[1] = vv[1] = 1 hp[1] = hp[2] hv[1] = -2 ldr = "E" #Animate the title. while f==0 and d==0 and vp[9]<6: for i in range(1, 10): flr = "EDEPITNEC"[i - 1:i]*2 printat(vp[i], hp[i], " ") hundredfoot(i) printscreen() if f==0 and d==0: t = 0 #Animate the flea and spider. for i in range(1, 24): printat(i - 1, hp[5] - 1, " " if i!=10 else "By") printat(i, hp[5] - 1, "#") if i>=11: printat(15, i - 9, " Brian "[i - 11: i - 10] + ("/^>", "<^\\")[t]) t ^= -1 printscreen() printat(i, hp[5] - 1, " ") for i in range(i - 10, 14): printat(15, i + 2, " Brian "[i: i + 1] + ("<^\\", "/^>")[t]) t ^= -1 printscreen() j = i + 3 printat(15, j, "/^\\") printscreen() dupnframes(4) printat(15, j, "<->") printscreen() dupnframes(2) printat(15, j, "/^\\") printscreen() dupnframes(4) for i in range(i, i + 8): printat(15, i + 2, " "[i: i + 1] + (" /^\\", " <^>")[t]) t ^= -1 printscreen() #Restore game variables. offs = savoffs ldr = savldr flr = savflr return #Update score and remaining lives indicator. def updscore(): global k0 printat(12, 13 - offs, "SCORE: " + str(sc)) k0 = sc//12000 - k + 5 printat(13, 13 - offs, you*(k0 - 1) + " "*5) return #Main code begins here frames = [] at = [] ap = [] vp = [] vv = [] hp = [] hv = [] for i in range(14): at.append(0) ap.append(0) vp.append(0) vv.append(1) hp.append(11 + i) hv.append(2) mush = (" ", "-", "~", "o", "O", " ", "'", '"', "*", "%") random.seed() mat = [[0]*26 for _ in range(26)] lvl = -1 k0 = 4 k1 = 5 Yv = 23 Yh = 12 d0 = d = f = fs = fl = flv = flh = sc = t = k = fsc = scv = sch = schv = 0 rpeat = 0 lastinp = "0" #Show splash screen animation splatscreen() #Clear the screen. for i in range(25): printat(i, -offs, CLS) #Randomize and display mushroom placement. for i in range(1, 22): for j in range(1, 24): shroom = (random.random()<0.08 and 4) mat[i][j] = shroom printat(i, j, mush[shroom]) #Set up field boundaries. for i in range(25): mat[0][i] = mat[i][24] = mat[i][0] = mat[24][i] = wall lvl = -1 #Start next player life while k0>0: lvl = lvl//2 + 1 Yv = 23 Yh = 12 d0 = 0 if fs: printat(sv, sh, mush[mat[sv][sh]] + " " + mush[mat[sv][sh + 2]]) if fl: printat(flv, flh, mush[mat[flv][flh]]) f = fs = fl = fv = fh = sv = sh = anim = fsc = scv = sch = 0 printat(Yv, Yh, you) updscore() printscreen() #Start next centipede life while d0==0 and k0>0: lvl += 1 k1 = 0 for i in range(1, 13): at[i] = 1 vv[i] = 1 vp[i] = 1 ap[i] = 0 hp[i] = 11 + i hv[i] = -1 at[1] = -1 if lvl>1: i = 1 while (i0: for i in range(1, 13): if at[i]: hundredfoot(i) makebugspray() if f: firefly() else: makebugspray() fleafall() if d0: break spidance() if d0: break scorpoison() printscreen() #Finish the current shot and spider and flea movements. while f or fl or fs: for i in range(1, 13): if at[i]: hundredfoot(i) if f: firefly() if fl: fleafall() if fs: spidance() if fsc: scorpoison() printscreen() #Restore partial and poisoned mushrooms for i in range(1, 24): row = mat[i] for j in range(1, 24): m = row[j] m -= (m>=wall and wall) if m&3: mat[i][j] = 4 printat(i, j, mush[4]) printscreen() else: mat[i][j] = m printat(i, j, mush[m]) printscreen() dupnframes(16) finaldisplay() #print(len(frames), "frames") #print(time.time() - st, time.process_time())

Centi Mental - ASCII Animation