[Chennaipy] Python Animation in realtime

[Akhil Mohan]

Hello Guru,

Thanks Guru for your time.

This does not seem to my application and am looking some other way to get
it done.

Cheers!!

On Sat, Jan 10, 2015 at 9:50 AM, Guru Venkat <guruvenkat7 at gmail.com> wrote:

> Hi,
>
> I have not used the animation subroutine of matplotlib for animating 3D
> plots.
>
> However, I have used Visual Python for such animations. Take a look at the
> attached code. Maybe you are looking for something on these lines?
>
> On Fri, Jan 9, 2015 at 3:47 PM, Akhil Mohan <akhilmohanmec at gmail.com>
> wrote:
>
>> Hello,
>>
>> Let me explain a bit of what I am trying to do. I am using an Inertial
>> Measurement Unit (IMU) for obtaining orientation and this data is filtered
>> and sent via Bluetooth to PC. On the PC I am receiving the data using
>> pyserial. So the data being sent out in quaternion form (like Euler angle)
>> is used for creating an animation. The figure or object has to periodically
>> update the data and do the rotation according to the algorithm. These all
>> things works well.
>> Now the problem is the object I created is not updating or not moving in
>> real time and the implementation Funcfunction seems to be the culprit. Can
>> anyone suggest what is the mistake that I am doing ? Please see the sample
>> code :)
>>
>> Cheers!!
>> Akhil Mohan
>> ------------------------------
>>
>>
>> # Global variables
>> msg = ''
>> full_msg = None
>>
>> # First set up the figure, the axis, and the plot element we want to
>> animate
>> fig = plt.figure()
>> ax = fig.gca(projection='3d')
>> # ax = plt.axes(xlim=(0, 2), ylim=(-2, 2), zlim=(0, 10))
>> line, = ax.plot([], [], [], lw=1)
>>
>> # Setting the axes properties
>> ax.set_xlim3d([-2.0, 2.0])
>> ax.set_ylabel('X')
>> ax.set_ylim3d([-2.0, 2.0])
>> ax.set_ylabel('Y')
>> ax.set_zlim3d([-2.0, 2.0])
>> ax.set_ylabel('Z')
>>
>> # Get serial handle
>> s_handle = serial.Serial("COM15", 115200, timeout=0)
>> # initialization function: plot the background of each frame
>>
>> def init():
>> line.set_data([], [])
>> line.set_3d_properties([])
>> return line,
>>
>> # object vertices
>> obj = np.array([[-0.5, 0.5, 0.5, -0.5, -0.5, 0, -0.5, 0.5, 0, 0.5, -0.5],
>> [-0.5, -0.5, 0.5, 0.5, -0.5, 0, 0.5, -0.5, 0, 0.5, -0.5],
>> [ 0, 0, 0, 0, 0, 1.2, 0, 0, 1.2, 0, 0]]).T
>>
>> def main():
>> while(s_handle):
>> global msg
>> # i=0
>> if s_handle.inWaiting() != 0:
>> msg += str(s_handle.read(s_handle.inWaiting()))­
>> # Look for full message.
>> full_msg = msg.split('Z')
>> for f in full_msg:
>> # print f,len(f)
>> if (len(f) == 35):
>> q = np.array([float(m) for m in f.split(',')])
>> # print q
>> quat_data = np.array([quaternion_rotate(q, pure_quaternion(p)) for p in
>> obj])[:, 1:] # quaternion function is working fine :)
>> return quat_data
>>
>> def animate(i):
>> rot_obj = main()
>> x = list(rot_obj[:, 0])
>> y = list(rot_obj[:, 1])
>> z = list(rot_obj[:, 2])
>> line.set_data(x, y)
>> line.set_3d_properties(z)
>> return line,
>>
>> anim = animation.FuncAnimation(fig, animate, init_func=init,frames=10000,
>> interval=20, blit=True)
>> plt.show()
>>
>> --
>> -------------------------------------------------
>> Akhil Mohan (+91-7639168728)
>> Ph.D Scholar
>> IITM-CMC-SCTIMST
>>
>> _______________________________________________
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>> Chennaipy at python.org
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>>
>>
>
>
> --
> Thanks & Regards
>
> Guru Venkat
> PhD Scholar,
> Department of Electrical Engineering,
> Indian Institute of Technology, Madras.
> http://www.ee.iitm.ac.in/optics/guru
> Mobile: +91-9884314268
>
> _______________________________________________
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>
>


-- 
-------------------------------------------------
Akhil Mohan (+91-7639168728)
Ph.D Scholar
IITM-CMC-SCTIMST
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