国外网友rhubarbdog为了解决这个问题，编写了一个新的scroll函数，可以用不同方向滚动显示文字和图案。
https://github.com/rhubarbdog/microbit-scrolling-images
经过站长测试，发现这个程序需要在新版本的python上才能运行，旧版本上会出现内存分配错误。
代码： 全选
from microbit import Image, display, sleep
def _message2images(message):
if not isinstance(message, (str, list, tuple)):
raise TypeError('argument must be a string, list or tuple.')
if type(message) is str:
message=(message)
result=[]
for m in message:
if type(m) is str:
l=len(m)
elif type(m) == type(Image.HEART):
l=None
else:
raise TypeError('message can only contain text and images.')
if l is None:
result.append(m)
else:
for char in m:
m=Image(char)
result.append(m)
return result
def rotate_image(image,clockwise=True):
if type(Image.HEART) != type(image):
raise TypeError("argument must be an Image.")
return _rotate_image(image,clockwise)
def _rotate_image(image,clockwise=True):
new=Image(5,5)
for y in range(5):
for x in range(5):
if clockwise:
new.set_pixel(4-y,x,image.get_pixel(x,y))
else:
new.set_pixel(y,4-x,image.get_pixel(x,y))
return new
def reflect_image(image,in_x=True):
if type(Image.HEART) != type(image):
raise TypeError("argument must be an Image.")
return _reflect_image(image,in_x)
def _reflect_image(image,in_x=True):
new=Image(5,5)
for y in range(5):
for x in range(5):
if in_x:
new.set_pixel(x,4-y,image.get_pixel(x,y))
else:
new.set_pixel(4-x,y,image.get_pixel(x,y))
return new
def scroll_up(message,delay=150,scroll_down=False,monospace=False):
def analyse_image(image):
rows=reversed(range(5))
skip=0
for y in rows:
for x in range(5):
if image.get_pixel(x,y)!=0:
return skip
skip+=1
return 5
if not display.is_on():
return None
err=False
try:
images=_message2images(message)
except TypeError as err_txt:
save=err_txt
err=True
if err:
raise TypeError(save)
for i in range(len(images)):
new=_rotate_image(images[i],not scroll_down)
if scroll_down:
new=_reflect_image(new)
images[i]=new
blank=Image(5,5)
current=blank
for pic in images:
if monospace:
skip=0
else:
skip=analyse_image(pic)
if skip == 5:
skip=4
for row in range(5-skip):
if scroll_down:
current=current.shift_down(1)
current.blit(pic,0,row,5,1,0,0)
else:
current=current.shift_up(1)
current.blit(pic,0,row,5,1,0,4)
display.show(current,clear=False,wait=False)
sleep(delay)
if scroll_down:
current=current.shift_down(1)
current.blit(blank,0,row,5,1,0,0)
else:
current=current.shift_up(1)
current.blit(blank,0,row,5,1,0,4)
display.show(current,clear=False,wait=False)
sleep(delay)
for row in range(5):
if scroll_down:
current=current.shift_down(1)
current.blit(blank,0,0,5,1,0,0)
else:
current=current.shift_up(1)
current.blit(blank,0,0,5,1,0,4)
display.show(current,clear=False,wait=False)
sleep(delay)
def scroll(message,delay=150,upside_down=False,monospace=False):
def analyse_image(image,left2right=False):
columns=range(5)
if not left2right:
columns=reversed(columns)
skip=0
for x in columns:
for y in range(5):
if image.get_pixel(x,y)!=0:
return skip
skip+=1
return 5
if not display.is_on():
return None
err=False
try:
images=_message2images(message)
except TypeError as err_txt:
save=err_txt
err=True
if err:
raise TypeError(save)
if upside_down:
for i in range(len(images)):
images[i] = _rotate_image(_rotate_image(images[i]))
blank=Image(5,5)
current=blank
for pic in images:
if monospace:
skip=0
else:
skip=analyse_image(pic,upside_down)
if skip == 5:
skip=4
for col in range(5-skip):
if upside_down:
current=current.shift_right(1)
current.blit(pic,4-col,0,1,5,0,0)
else:
current=current.shift_left(1)
current.blit(pic,col,0,1,5,4,0)
display.show(current,clear=False,wait=False)
sleep(delay)
if upside_down:
current=current.shift_right(1)
current.blit(blank,0,0,1,5,0,0)
else:
current=current.shift_left(1)
current.blit(blank,0,0,1,5,4,0)
display.show(current,clear=False,wait=False)
sleep(delay)
for col in range(5):
if upside_down:
current=current.shift_right(1)
current.blit(blank,0,0,1,5,0,0)
else:
current=current.shift_left(1)
current.blit(blank,0,0,1,5,4,0)
display.show(current,clear=False,wait=False)
sleep(delay)
text=(Image.HAPPY," Hello world. ",Image.HAPPY)
while True:
scroll(text)
sleep(1000)
scroll_up(text)
sleep(1000)
scroll(text,upside_down=True)
sleep(1000)
scroll_up(text,scroll_down=True)
sleep(1000)