plotting slows down
First let me say I have not done much python programming!
I am running Python 2.7.3.
I am trying to use python as a front end to a simple oscilloscope.
Ultimately I intend to use it with my micropython board.
At the moment I am just developing it. All it does is use a module I found
called graphics.py to create a window and display randomly generated data.
Each time it goes through the outer loop it gets slower and slower.
I put in a small delay just so I could observe what is happening and for the
first line it draws it takes about a second. If I set it to loop 20 times the
final loop takes more than 6 seconds.
Can anyone explain what I am doing wrong please?
Here is the code:
[code]
#!/usr/bin/python
from graphics import *
import random
import time
xpos=1200
ypos=400
ypnt=ypos/2
pos=1
#setBackground("white")
def main():
win = GraphWin("My Circle", xpos, ypos)
# win.setBackGround('white')
for y in range(1,5):
cir2 = Circle(Point(xpos/2,20), 10)
cir2.setFill("white")
cir2.draw(win)
message = Text(Point(win.getWidth()/2, 20), y)
message.draw(win)
j = random.randint(1,ypos)
for x in range(1,xpos):
updown = random.randint(0,1)
if updown:
j=j+1
else:
j=j-1
if j <1:
j=ypos/2
if j>ypos-1:
j=ypos/2
win.plot(x,j,"red")
time.sleep(.0001)
main()
time.sleep(5)
[/code]
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Re: plotting slows down
On Monday, 13 January 2014 08:15:08 UTC, Norman Elliott wrote:
> First let me say I have not done much python programming!
>
> I am running Python 2.7.3.
>
> I am trying to use python as a front end to a simple oscilloscope.
>
> Ultimately I intend to use it with my micropython board.
>
>
>
> At the moment I am just developing it. All it does is use a module I found
> called graphics.py to create a window and display randomly generated data.
>
>
>
> Each time it goes through the outer loop it gets slower and slower.
>
> I put in a small delay just so I could observe what is happening and for the
> first line it draws it takes about a second. If I set it to loop 20 times the
> final loop takes more than 6 seconds.
>
> Can anyone explain what I am doing wrong please?
>
> Here is the code:
>
> [code]
>
> #!/usr/bin/python
>
> from graphics import *
>
> import random
>
> import time
>
>
>
> xpos=1200
>
> ypos=400
>
> ypnt=ypos/2
>
> pos=1
>
> #setBackground("white")
>
> def main():
>
> win = GraphWin("My Circle", xpos, ypos)
>
> # win.setBackGround('white')
>
> for y in range(1,5):
>
> cir2 = Circle(Point(xpos/2,20), 10)
>
> cir2.setFill("white")
>
> cir2.draw(win)
>
> message = Text(Point(win.getWidth()/2, 20), y)
>
> message.draw(win)
>
> j = random.randint(1,ypos)
>
> for x in range(1,xpos):
>
> updown = random.randint(0,1)
>
> if updown:
>
> j=j+1
>
> else:
>
> j=j-1
>
> if j <1:
>
> j=ypos/2
>
> if j>ypos-1:
>
> j=ypos/2
>
> win.plot(x,j,"red")
>
> time.sleep(.0001)
>
>
>
> main()
>
> time.sleep(5)
>
> [/code]
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Re: plotting slows down
I am running ubuntu 12.04 with all updates installed. I got the graphics here: http://mcsp.wartburg.edu/zelle/python/graphics/graphics/index.html I cannot see how to change from html to text mode in chromium or within the group. I read the link about double spacing so I will watch out for it. -- https://mail.python.org/mailman/listinfo/python-list
Re: plotting slows down
On Monday, 13 January 2014 18:05:52 UTC, Dave Angel wrote:
> Chris Angelico Wrote in message:
>
Well Ian's suggestion has really done the job. Now each iteration takes just
0.14 seconds now.
changed to:
[code]
win = GraphWin("My Circle", xpos, ypos, autoflush=False)
[/code]
and added
[code]
update()
[/code]
immediately after the line
[code]
for y in range(1,12):
[/code]
previously the first iteration took 0.48 seconds and the the 10th 4.76
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Re: plotting slows down
@Dave, no problem. I am using gedit to write the files and have it set to
translate tabs into 4 spaces which is what was recommended to me as the right
amount of indenting for python scripts.
On Monday, 13 January 2014 08:15:08 UTC, Norman Elliott wrote:
> First let me say I have not done much python programming!
>
> I am running Python 2.7.3.
>
> I am trying to use python as a front end to a simple oscilloscope.
>
> Ultimately I intend to use it with my micropython board.
>
>
>
> At the moment I am just developing it. All it does is use a module I found
> called graphics.py to create a window and display randomly generated data.
>
>
>
> Each time it goes through the outer loop it gets slower and slower.
>
> I put in a small delay just so I could observe what is happening and for the
> first line it draws it takes about a second. If I set it to loop 20 times the
> final loop takes more than 6 seconds.
>
> Can anyone explain what I am doing wrong please?
>
> Here is the code:
>
> [code]
>
> #!/usr/bin/python
>
> from graphics import *
>
> import random
>
> import time
>
>
>
> xpos=1200
>
> ypos=400
>
> ypnt=ypos/2
>
> pos=1
>
> #setBackground("white")
>
> def main():
>
> win = GraphWin("My Circle", xpos, ypos)
>
> # win.setBackGround('white')
>
> for y in range(1,5):
>
> cir2 = Circle(Point(xpos/2,20), 10)
>
> cir2.setFill("white")
>
> cir2.draw(win)
>
> message = Text(Point(win.getWidth()/2, 20), y)
>
> message.draw(win)
>
> j = random.randint(1,ypos)
>
> for x in range(1,xpos):
>
> updown = random.randint(0,1)
>
> if updown:
>
> j=j+1
>
> else:
>
> j=j-1
>
> if j <1:
>
> j=ypos/2
>
> if j>ypos-1:
>
> j=ypos/2
>
> win.plot(x,j,"red")
>
> time.sleep(.0001)
>
>
>
> main()
>
> time.sleep(5)
>
> [/code]
--
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Re: plotting slows down
On Monday, 13 January 2014 08:15:08 UTC, Norman Elliott wrote:
> First let me say I have not done much python programming!
>
> I am running Python 2.7.3.
>
> I am trying to use python as a front end to a simple oscilloscope.
>
> Ultimately I intend to use it with my micropython board.
>
>
>
> At the moment I am just developing it. All it does is use a module I found
> called graphics.py to create a window and display randomly generated data.
>
>
>
> Each time it goes through the outer loop it gets slower and slower.
>
> I put in a small delay just so I could observe what is happening and for the
> first line it draws it takes about a second. If I set it to loop 20 times the
> final loop takes more than 6 seconds.
>
> Can anyone explain what I am doing wrong please?
>
> Here is the code:
>
> [code]
>
> #!/usr/bin/python
>
> from graphics import *
>
> import random
>
> import time
>
>
>
> xpos=1200
>
> ypos=400
>
> ypnt=ypos/2
>
> pos=1
>
> #setBackground("white")
>
> def main():
>
> win = GraphWin("My Circle", xpos, ypos)
>
> # win.setBackGround('white')
>
> for y in range(1,5):
>
> cir2 = Circle(Point(xpos/2,20), 10)
>
> cir2.setFill("white")
>
> cir2.draw(win)
>
> message = Text(Point(win.getWidth()/2, 20), y)
>
> message.draw(win)
>
> j = random.randint(1,ypos)
>
> for x in range(1,xpos):
>
> updown = random.randint(0,1)
>
> if updown:
>
> j=j+1
>
> else:
>
> j=j-1
>
> if j <1:
>
> j=ypos/2
>
> if j>ypos-1:
>
> j=ypos/2
>
> win.plot(x,j,"red")
>
> time.sleep(.0001)
>
>
>
> main()
>
> time.sleep(5)
>
> [/code]
Okay, maybe I misunderstood what it was doing. I have checked and I will do a
find and replace of the tabs with 4 spaces in future.
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