Re: [Visualpython-users] Move a clock pulse train, please help

[Bruce S. <Bru...@nc...>]

I leave this extension to you. You've already structured your program
appropriately by starting to create a list of displays. Just create
all 8 displays, and in the animation loop loop over these displays to
update all 8 pulse trains (displaced as you say).

Bruce Sherwood

On Fri, Oct 19, 2012 at 10:35 AM, liming xiu <lm...@gm...> wrote:
> Dear Bruce:
>
> Thanks.  It looks great!
>
> Can I ask you one more favor:
>
> I want to create 8 of these clock pulse trains, from screen top to
> bottom ( the screen can be made bigger).
>
> 1. All the 8 pulse trains have save frequency (same T).
> 2. Time-wise, each pulse trains is delayed from its previous one by
> (1/8)T. In other words, the second one is (1/8)T behind the first one,
> the third one is  (1/8)T behind the second one.
> 3. They all move from left to right.
>
> Can you help me on this?
>
> Thanks in advance!
>
>
>
>
>
> On Fri, Oct 19, 2012 at 11:14 AM, Bruce Sherwood
> <Bru...@nc...> wrote:
>> That's a clever way to make a pulse train; I wouldn't have thought of
>> using the math ceil function. Here's one way to animate the pulse
>> train, moving to the right. I set the range to 9 so that the pulses
>> fill the screen. I move the display's center to the left until one
>> period has elapsed, when I reset the center to the origin:
>>
>> from visual import *
>>
>> g = []
>> g.append(display(x = 0, y = 100, width=1000, height=400, range=9))
>>
>> g[0].title="Second try"
>>
>> k = 5
>> T = 2*pi/k
>> c = curve( x = arange(-10,10,0.01),
>>         display=g[0],radius=0.07,color=color.yellow  ) # Draw a pulse train
>> c.y = ceil(sin( k*c.x ))
>>
>> t = 0
>> dt = T/20
>> while True:
>>     rate(100)
>>     g[0].center.x -= dt
>>     t += dt
>>     if t >= T:
>>         g[0].center.x = 0
>>         t = 0
>>
>> You might wish to disable userspin and userzoom to prevent the viewer
>> from messing up the display.
>>
>> Just in case you hadn't noticed it, I'll comment that in your original
>> program you don't need a loop at the end to keep the display alive.
>> When you come to the end of a VPython program, the display remains on
>> the screen and you can zoom and rotate.
>>
>> Bruce Sherwood
>>
>> On Fri, Oct 19, 2012 at 9:39 AM, liming xiu <lm...@gm...> wrote:
>>> Hi,
>>>
>>> I am new to VPython. I want to use this tool to do a project for my work.
>>>
>>> I create a clock pulse train using the few lines below.
>>>
>>> ----------------------------------------------------
>>> from visual import *
>>>
>>> g = []
>>> g.append(display(x = 0, y = 100, width=1000, height=400))
>>>
>>> g[0].title="First try"
>>>
>>> c = curve( x = arange(-10,10,0.01),
>>> display=g[0],radius=0.07,color=color.yellow  ) # Draw a helix
>>> c.y = ceil(sin( 5.0*c.x ))
>>>
>>> while True:
>>>     rate(5)