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POError with NPC random movement
 

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  1. POError with NPC random movement
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    <p>I made part of a game. In the game there is a player and enemies. I decided to add NPC characters to the game which move randomly. The problem is that they do not draw as expected. </p> <p>NPCs do not run as smoothly as the rest of the code. When an NPC moves around it leaves big patches of white where it has been. I think it's the speed of the update but I'm not quite sure. The framerate is roughly 40 fps. I have tried to find a problem in the update function of NPCs but it looks perfectly fine. However, NPCs only stop creating the weird white patches when I exclude the <code>def update(self)</code>. I'm running Window Vista, Python 2.6 and Pygame. Any help is appreciated.</p> <pre><code>class NPC(pygame.sprite.Sprite): change_x = 0 def __init__(self, color, width, height): pygame.sprite.Sprite.__init__(self) self.image = pygame.Surface([width, height]) self.image.fill(white) self.rect = self.image.get_rect() def update(self): self.rect.x += self.change_x speed = 2 Movementlist = ['moveRight', 'moveLeft'] randomMove = random.choice(Movementlist) if randomMove == 'moveRight': self.change_x = -6 * speed elif randomMove == 'moveLeft': self.change_x = 6 * speed </code></pre> <p>Here is the where an NPC is created:</p> <pre><code>if level == 1: npc = NPC(white, 20, 15) npc.rect.x = 400 npc.rect.y = 485 NPC_list.add(npc) all_sprites_list.add(npc) </code></pre> <p>And here's the update: </p> <pre><code>NPC_list.update() </code></pre> <p>The draw commands are here:</p> <pre><code># --- Draw Frame # Set the screen background if level &lt; 5 or level == 5: screen.fill(black) if level == 10: screen.fill(silver) all_sprites_list.draw(screen) # Go ahead and update the screen with what we've drawn. pygame.display.update() # Limit to 40 frames per second clock.tick(40) </code></pre>
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    1. USSandman
    1. USSandman
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      1. VTApproveEditSuggestion
    1. COSince you're describing a graphical artifact - large patches of white remaining where the NPC has been - your draw operations would be of interest.
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      1. POError with NPC random movement
      1. USkevintodisco
    2. COShow NPC draw function and mainloop with all draw/blit/fill functions. Maybe you forgot to clear screen before you draw new frame.
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      1. POError with NPC random movement
      1. USfuras
    3. COYour code works fine for me.
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      1. POError with NPC random movement
      1. USuser2746752
 

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