Dick Moores schrieb:
At 03:12 AM 8/9/2008, Dick Moores wrote:
4. For my random_rectangles.py program I've started to try out the
new turtle. (See the current state of random_rectanglesV16_web.py at
< http://py77.python.pastebin.com/d3e842821>.)
<http://py77.python.pastebin.com/d3e842821%3E.%29%A0> The only
downside I've found is that the new turtle is much faster that the
old. I want to set the speed so that the outlines of rectangles are
drawn slowly enough that the user (me at present) can both appreciate
the colors and have time to check the names of the colors being
printed in the console window. Using the old turtle, I found that a
default delay of 1 ((delay(1)) was just right; with the new turtle,
setting a delay of even 50 affects only the first cycle of
rectangles. So I don't use delay at all. Setting the slowest speed of
1 (speed(1)) is still too fast. How can I slow down the drawing of
the rectangles?
I seem to have solved #4.
I had been using tracer() as tracer(True) in my function draw_rect().
In rereading the doc, I noticed that <
http://docs.python.org/dev/library/turtle.html#turtle.tracer>
has
"turtle.tracer(/flag=None/, /delay=None/)"
so in draw_rect() I tried changing tracer(True) to tracer(True, dly).
(See the new version, random_rectanglesV17_web.py, at <
http://py77.python.pastebin.com/f54c9211f>, lines 220, 230, 240, etc.)
Then I enabled the user to enter both speed and delay, with a default
speed of 1 and a default delay of 15 (see the new function
get_speed_and_delay_from_user(), lines 153-179). On my computer, these
defaults seemed to be ideal.
That's fine!
But now I have another puzzle: As long as delay is kept constant, it
doesn't seem to matter what speed is chosen -- from the slowest of 1
to the fastest of 0. Why is speed irrelevant?
Did you observe that faster speeds need arguments in the range from 2 to 10?
That means speed(10) is fastest speed.
Gregor
Dick
BTW at < http://py77.python.pastebin.com/f54c9211f>, if you click on
the 'view diff' link just above the code, you'll get a diff with the
immediately previous version.
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