[英]Turtle graphics animation (shelf)
我想定義一個函數insert_animate(blockposition, shelf, high)
,使得其在去除塊blockposition
從shelf
和插入在該塊到一個較高的位置high
,在high
是一個整數。 該函數應該在零和高位之間找到這個位置,不包括高位。 如果沒有找到這樣的位置,則將塊插入高位置。
我設法提出了這個功能:
def insert_animate(blockposition, shelf, high):
if blockposition==0:
return shelf
else:
a=s.pop(blockposition)
for i in range(high):
if a.size<=s[i].size:
s.insert(i,a)
break
else:
s.insert(high,a)
return shelf
但是,這僅適用於某些情況,而不是全部。 我不知道我哪里出錯了。
s = shelf.init_shelf((2, 6, 1, 4, 8, 3, 9))
print(insert_animate(0, s, 0)) # returns [Block size: 2, Block size: 6, Block size: 1, Block size: 4, Block size: 8, Block size: 3, Block size: 9]
print(insert_animate(3, s, 3))
# returns [Block size: 1, Block size: 2, Block size: 4, Block size: 6, Block size: 4, Block size: 4, Block size: 8, Block size: 3, Block size: 9]
但它應該是(第二次印刷):
[Block size: 1, Block size: 2, Block size: 4, Block size: 6, Block size: 4, Block size: 4, Block size: 8, Block size: 3, Block size: 9]
print(insert_animate(6, s, 6))
# returns [Block size: 1, Block size: 2, Block size: 4, Block size: 6, Block size: 4, Block size: 4, Block size: 8, Block size: 8, Block size: 8, Block size: 8, Block size: 8, Block size: 8, Block size: 3, Block size: 9]
但它應該是:
[Block size: 1, Block size: 2, Block size: 4, Block size: 6, Block size: 8, Block size: 3, Block size: 9]
為什么我的代碼適用於某些情況但不適用於其他情況? 問題出在我的for循環中嗎? 如果有人可以提供幫助,我會非常感激! 謝謝!
這是我正在處理的文件:
from turtle import *
class Block(Turtle):
def __init__(self, size):
self.size = size
Turtle.__init__(self, shape="square", visible=False)
self.pu()
self.shapesize(size * 1.5, 1.5, 2) # square-->rectangle
self.fillcolor("black")
self.st()
def glow(self):
self.fillcolor("red")
def unglow(self):
self.fillcolor("black")
def __repr__(self):
return "Block size: {0}".format(self.size)
class Shelf(list):
def __init__(self, y):
"create an shelf. y is y-position of first block"
self.y = y
self.x = -150
def push(self, d):
width, _, _ = d.shapesize()
yoffset = width/2 * 20 # to align the blocks by it's bottom edge
d.sety(self.y + yoffset)
d.setx(self.x+34*len(self))
self.append(d)
def _close_gap_from_i(self, i):
for b in self[i:]:
xpos, _ = b.pos()
b.setx(xpos - 34)
def _open_gap_from_i(self, i):
for b in self[i:]:
xpos, _ = b.pos()
b.setx(xpos + 34)
def pop(self, key):
b = list.pop(self, key)
b.glow()
b.sety(200)
self._close_gap_from_i(key)
return b
def insert(self, key, b):
self._open_gap_from_i(key)
list.insert(self, key, b)
b.setx(self.x+34*key)
width, _, _ = b.shapesize()
yoffset = width/2 * 20 # to align the blocks by it's bottom edge
b.sety(self.y + yoffset)
b.unglow()
def show_text(text):
goto(0,-250)
write(text, align="center", font=("Courier", 16, "bold"))
def start_sort():
onkey(None,"space")
clear()
show_text("sort_me")
sort_func(s)
def init_shelf(vals=(4, 8, 2, 9, 3, 1, 10, 7, 5, 6)):
s = Shelf(-200)
for i in vals:
s.push(Block(i))
return s
def clear_window():
getscreen().clearscreen()
def main(func):
global sort_func
sort_func = func
getscreen().clearscreen()
ht(); penup()
init_shelf()
show_text("press spacebar to start sorting")
onkey(start_sort, "space")
onkey(bye, "Escape")
listen()
mainloop()
在調用insert_animate()
之后很難按照你的啟動順序和最終訂單的例子,但這里是我猜錯了:
我相信你的else
子句縮進不正確(太深),以至於當它真的應該成為for
語句的一部分時它已經成為if
語句的一部分:
def insert_animate(blockposition, shelf, high):
if blockposition == 0:
return shelf
a = s.pop(blockposition)
for i in range(high):
if a.size <= s[i].size:
s.insert(i, a)
break
else: # no break
s.insert(high, a)
return shelf
正如最初編寫的那樣, else
子句可以執行多次,但是當for
循環通過除break
之外的方式退出時,你只需要執行一次。 以這種方式綁定到循環的else
子句可以被認為是“不中斷”,即如果循環具有break
語句但是沒有被執行則執行此代碼。
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.