如何解决卡特彼勒项目混乱
我在项目中遇到问题,可以使用一些帮助找出我做错了什么。
import random
# Define some colors
black = ( 0,0)
white = ( 255,255,255)
green = ( 0,0)
red = ( 255,0)
class caterpillar:
def __init__(self,x,y):
self.face_xcoord = x
self.face_ycoord = y
self.body = segment_queue()
t = random.randrange(0,2)
if t == 0:
self.travel_direction = 'left'
else:
self.travel_direction = 'right'
def display_caterpillar(self,screen):
self.draw_face(screen)
self.draw_body(screen)
def draw_face(self,screen):
x = self.face_xcoord
y = self.face_ycoord
pygame.draw.ellipse(screen,red,[x,y,40,45])
pygame.draw.ellipse(screen,black,[x+6,y+10,10,15])
pygame.draw.ellipse(screen,[x+24,15])
pygame.draw.line(screen,(x+11,y),(x+9,y-10),3)
pygame.draw.line(screen,(x+24,(x+26,3)
def draw_body(self,screen):
# traverse the segment queue
current_node = self.body.head
while current_node is not None:
current_node.draw_segment(screen)
current_node = current_node.next
####### you need to complete these two methods
def grow(self):
if self.body.length == 0:
if self.travel_direction == 'left':
self.body.addSegment(self.face_xcoord + 40,self.face_ycoord)
elif self.travel_direction == 'right':
self.body.addSegment(self.face_xcoord - 35,self.face_ycoord)
else:
self.body.addSegment(self.body.last,self.face_ycoord)
# if body is empty new segment should be placed relative to head
# else find x and y coordinates for current last body segment
# call addSegment() method on self.body with correct location parameters
def move(self):
return
# check the direction of movement
# move head forwards by 2
# move body parts forwards by 2
class segment_queue:
def __init__(self):
self.length = 0
self.head = None
self.last = None
def isEmpty(self):
return self.length == 0
####### you need to complete this method
def addSegment(self,y):
node = body_segment(x,y)
if self.length == 0:
self.head = self.last = node
else:
last = self.last
last.next = node
self.last = node
self.length = self.length + 1
# create a new body_segment node,with parameters x and y
# if segment queue is empty,the new node is both head and last
# else,find the last node and then append the new node to the end of the queue
# increment length of the segment queue
class body_segment:
def __init__(self,y):
self.xcoord = x
self.ycoord = y
self.next = None
def draw_segment(self,screen):
x = self.xcoord
y = self.ycoord
pygame.draw.ellipse(screen,green,35,40])
pygame.draw.line(screen,(x+8,y+35),y+45),3)
下一个文件
import catclass
# Define some colors
black = ( 0,0)
white = ( 255,255)
green = ( 0,0)
red = ( 255,0)
lightblue = ( 0,255)
# Initialize pygame
pygame.init()
# Set the height and width of the screen
size=[1000,400]
screen=pygame.display.set_mode(size)
# Set title of screen
pygame.display.set_caption("Caterpillar")
# Function to draw background scene
def draw_background():
screen.fill(black)
pygame.draw.rect(screen,[0,300,1000,100])
pygame.draw.rect(screen,lightblue,300])
pygame.draw.ellipse(screen,white,[50,80,100,60])
pygame.draw.ellipse(screen,[120,60,180,80])
pygame.draw.ellipse(screen,[700,150,60])
# Create a caterpillar at a particular location
mycaterpillar = catclass.caterpillar(500,250)
# Loop until the user clicks the close button.
done=False
# Used to manage how fast the screen updates
clock=pygame.time.Clock()
######################################
# -------- Main Program Loop -----------
while done==False:
for event in pygame.event.get(): # User did something
if event.type == pygame.QUIT: # If user clicked close
done=True # Flag that we are done so we exit this loop
if event.type == pygame.KEYDOWN: # If user wants to perform an action
# Figure out which action to perform
if event.key == pygame.K_SPACE:
mycaterpillar.grow()
if event.key == pygame.K_m:
mycaterpillar.move()
# Draw the background scene
draw_background()
# Draw the caterpillar
mycaterpillar.display_caterpillar(screen)
# Limit to 20 frames per second
clock.tick(10)
# Go ahead and update the screen with what we've drawn.
pygame.display.flip()
# If you forget this line,the program will 'hang' on exit.
pygame.quit ()
我面临的问题是,我无法弄清楚为什么在调用grow()
方法时我的毛毛虫不会长于一个身体部分。当前,在调用if
语句中的函数时仅增长了一个段。 else
语句似乎没有任何作用。
解决方法
我在您的代码中注意到了几件事:
- 在
addSegment
方法中,length
永远不会超过零 - 在
grow
方法中,仅添加第一段。其他细分将被忽略。 - 正如@Kingsley所提到的,您使用对象而不是x坐标创建了一个新段
对caterpillar
类进行以下更改:
def grow(self):
if self.body.length == 0: # first segment
if self.travel_direction == 'left':
self.body.addSegment(self.face_xcoord + 40,self.face_ycoord)
elif self.travel_direction == 'right':
self.body.addSegment(self.face_xcoord - 35,self.face_ycoord)
else: # other segs
if self.travel_direction == 'left':
self.body.addSegment(self.body.last.xcoord + 40,self.face_ycoord)
elif self.travel_direction == 'right':
self.body.addSegment(self.body.last.xcoord - 35,self.face_ycoord)
def addSegment(self,x,y):
node = body_segment(x,y)
if self.length == 0:
self.head = self.last = node
self.length += 1 # add this line
else:
last = self.last
last.next = node
self.last = node
self.length = self.length + 1
输出
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