python - Cannot get pygame animation to work properly -


hello i'm newbie @ pygames. trying add animation ( cat drifting across screen right left) in code not know what's i'm doing wrong. cat goes across screen drags trail of white or black , i've been trying forever solve problem. code far. know can't load because of images. want know , how can insert , edit cat code won't go across screen in loop dragging band of white.

import pygame  # define colors black    = (   0,   0,   0) white    = ( 255, 255, 255) green    = (   0, 255,   0) red      = ( 255,   0,   0) brown    = (  87,  52,  18) blue     = (  17,  35, 107)  pygame.init()  # character creation  def character(screen, x, y):      #head     pygame.draw.circle (screen, brown, [20+x, 2+y], 10)     pygame.draw.circle (screen, black, [17+x, y], 1)     pygame.draw.circle (screen, black, [23+x, y], 1)      #coat     pygame.draw.rect (screen, blue, [15+x,11+y, 10, 20])     pygame.draw.line (screen,blue, [15+x,12+y], [x,20+y],5)     pygame.draw.line (screen,blue, [23+x,12+y], [39+x,20+y],5)      #pants     pygame.draw.line (screen,black,[17+x,29+y],[10+x,49+y],5)     pygame.draw.line (screen,black,[22+x,29+y],[30+x,49+y],5)   # set width , height of screen [width, height] size = (500, 400) screen = pygame.display.set_mode(size)  #load pixel backgrounds  pygame.display.set_caption("my game")  livingroom = pygame.image.load("living room cropped.png")  dininghall = pygame.image.load("dining hall cropped.png")  kitchen = pygame.image.load("kitchen cropped.png")  southhall = pygame.image.load("south hall cropped.png")  northhall = pygame.image.load("north hall cropped.png")  secretroom = pygame.image.load("secret library cropped.png")  childbedroom = pygame.image.load("children's room cropped.png")  masterbedroom = pygame.image.load("master bedroom cropped.png")  washroom = pygame.image.load("washroom cropped.png")  cat = pygame.image.load("cat.png").convert()  #-----------------------  #image onto screen  #backgound updates:  screen.blit(livingroom, [0, 0]) myfont = pygame.font.sysfont("monospace", 15) room = myfont.render("this living room. find secret library,", 2, black) screen.blit(room, (0, 300)) myfont = pygame.font.sysfont("monospace", 15) room = myfont.render("you must son hennry , daughter", 2, black) screen.blit(room, (0, 325)) myfont = pygame.font.sysfont("monospace", 15) room = myfont.render("alice sleep.", 2, black) screen.blit(room, (0, 350)) character(screen,200,200)   #loop until user clicks close button. done = false  # used manage how fast screen updates clock = pygame.time.clock()  catx = 550 screen.blit(cat, [catx,275])   # coordinates of character function x = 250 y = 200   #list of rooms  room_list = []  livingroom = ["this living room. find secret library,", "you must son hennry , daughter"," alice sleep.", 2, none, none, none,livingroom] room_list.append(livingroom)  kitchen = ["you in kitchen. ah water boiling perfect!","now can make tea. after tea why don't around?", "the library might in room!", 3, 2, none, none,kitchen] room_list.append(kitchen)  dininghall = ["this dining room. room has table in the","middle. after meal tired!. next, find", "where wife , nap!", 4, none, 0, 1,dininghall] room_list.append(dininghall)  secretroom = ["ah have found secret library!", "i can return being human!","end", none, none, 1, none,secretroom] room_list.append(secretroom)  southhall = ["you have entered second hall, south hall.","oh, it's noon! i'm hungry! find place", "where family dines.", 7, 5, 2, none,southhall] room_list.append(southhall)  washroom = ["this bathroom. it's big , clean big tub.","after bath let's go tea. think have","some water boiling on stove.", 8, none, none, 4,washroom] room_list.append(washroom)  childbedroom = ["you have entered children's bedroom. finally","cleaned room! next, find place in south","with beautiful red , gold carpet.", none, 7, none, none,childbedroom] room_list.append(childbedroom)  northhall = ["this north hall. has paintings of ancestors on walls, ", "i'm feeling nice bath right now! take me to", "the washroom please!", none, 8, 4, 6,northhall] room_list.append(northhall)  masterbedroom = ["you have entered bedroom. wife , i", "sleep. grandparents slept in room. find", "the hall painting of grandparents.", none, none, 5, 7, masterbedroom] room_list.append(masterbedroom)  current_room = 0    # -------- main program loop ----------- while not done:     # --- main event loop     event in pygame.event.get():         if event.type == pygame.quit:             done = true          if event.type == pygame.keydown: #------------------------------------- north ---------------------------------------              if event.key == pygame.k_up:                 next_room = room_list[current_room][3]                 if next_room == none:                     myfont = pygame.font.sysfont("monospace", 15)                     room = myfont.render("you cannot go way.", 1, black)                     screen.blit(room, (200, 250))                 else:                     current_room = next_room                     screen.blit(room_list[current_room][7],[0,0])                     myfont = pygame.font.sysfont("monospace", 15)                     room = myfont.render(room_list[current_room][0], 5, black)                     screen.blit(room, (0, 300))                     myfont = pygame.font.sysfont("monospace", 15)                     room = myfont.render(room_list[current_room][1], 5, black)                     screen.blit(room, (0, 325))                     myfont = pygame.font.sysfont("monospace", 15)                     room = myfont.render(room_list[current_room][2], 5, black)                     screen.blit(room, (0, 350))                     character(screen, 375,70)   #------------------------------------- east -----------------------------------------              elif event.key == pygame.k_right:                 next_room = room_list[current_room][4]                 if next_room == none:                     myfont = pygame.font.sysfont("monospace", 15)                     room = myfont.render("you cannot go way.", 1, black)                     screen.blit(room, (200, 250))                 else:                     current_room = next_room                     screen.blit(room_list[current_room][7], [0,0])                     myfont = pygame.font.sysfont("monospace", 15)                     room = myfont.render(room_list[current_room][0], 1, black)                     screen.blit(room, (0, 300))                     myfont = pygame.font.sysfont("monospace", 15)                     room = myfont.render(room_list[current_room][1], 5, black)                     screen.blit(room, (0, 325))                     myfont = pygame.font.sysfont("monospace", 15)                     room = myfont.render(room_list[current_room][2], 5, black)                     screen.blit(room, (0, 350))                     character(screen,375,65)  # ----------------------------------- south ----------------------------------------              elif event.key == pygame.k_down:                 next_room = room_list[current_room][5]                 if next_room == none:                     myfont = pygame.font.sysfont("monospace", 15)                     room = myfont.render("you cannot go way.", 1, black)                     screen.blit(room, (200, 250))                 else:                     current_room = next_room                     screen.blit(room_list[current_room][7], [0,0])                     myfont = pygame.font.sysfont("monospace", 15)                     room = myfont.render(room_list[current_room][0], 1, black)                     screen.blit(room, (0, 300))                     myfont = pygame.font.sysfont("monospace", 15)                     room = myfont.render(room_list[current_room][1], 5, black)                     screen.blit(room, (0, 325))                     myfont = pygame.font.sysfont("monospace", 15)                     room = myfont.render(room_list[current_room][2], 5, black)                     screen.blit(room, (0, 350))                     character(screen,65,90)   #------------------------------------- west -----------------------------------------              elif event.key == pygame.k_left:                  next_room = room_list[current_room][6]                  if next_room == none:                     myfont = pygame.font.sysfont("monospace", 15)                     room = myfont.render("you cannot go way.", 1, black)                     screen.blit(room, (200, 250))                  else:                     current_room = next_room                     screen.blit(room_list[current_room][7],[0,0])                     myfont = pygame.font.sysfont("monospace", 15)                     room = myfont.render(room_list[current_room][0], 1, black)                     screen.blit(room, (0, 300))                     myfont = pygame.font.sysfont("monospace", 15)                     room = myfont.render(room_list[current_room][1], 5, black)                     screen.blit(room, (0, 325))                     myfont = pygame.font.sysfont("monospace", 15)                     room = myfont.render(room_list[current_room][2], 5, black)                     screen.blit(room, (0, 350))                     character(screen,250,180)      if catx > -50:         catx -= 1     elif catx == -50:         catx = 550      screen.blit(cat, [catx,275])      # --- go ahead , update screen we've drawn.     pygame.display.flip()       # --- limit 60 frames per second     clock.tick(60)  # close window , quit. # if forget line, program 'hang' # on exit if running idle. pygame.quit()

you draw cat surface onto screen, again @ different position, , again etc...

imagine putting sticker on sheet of paper, @ different position, , again etc...

once draw surface onto another, stays there. if "move" image in loop, see kind of trail, in reality images put onto screen surface.

a simple solution fill screen solid color or background image once every iteration of loop before drawing other images.


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