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====== 2017-02-09: ======

test_moving_circles_1.2 mit 4 Kreisen

<code python>
from __future__ import division

import numpy as np
import moving_circles
from scipy.fftpack import *
from moving_circles import Canvas, Circle
from microlistener import MicroListener

# chose 'VISPY' or 'MATPLOTLIB'

PREFERRED_BACKEND = 'MATPLOTLIB_WX'   

######################################################
# One possible use case:
# Use timer event of backend to change graphic objects.
# Here 10 circles are created and a callback function
# action(...) is registered to be called at each timer
# event.
######################################################
###micolistener###
CHANNELS=2
RATE=44100
CHUNK=2**11
z=[]
	
def micro_callback(in_data, frame_count, time_info,status):
	global z
	y=np.array(np.fromstring(in_data,dtype=np.short),dtype=np.float)
	yf = fft(y)
	xf = np.linspace(0.0, (2.0*RATE), CHUNK/2)
	if CHANNELS==2:
		y=y.reshape((y.shape[0]//2,2))
	else:
		y=y.reshape((y.shape[0],1))
	#print int(np.linalg.norm(y[:,0])/2000.)*'*'
	z=np.abs(yf)
	return (in_data, status)

listen=MicroListener(RATE,CHANNELS,CHUNK,micro_callback)
###

def action(objects, event):
	global z
	z_100=z[17:20]			#194-215 Hz
	z_1000=z[176:196]		#1906-2110 Hz
	z_6000=z[928:1300]		#10002-13997 Hz
	#print z[2048]/1000000.0
	print z_100
	circ.set_radius((sum(z_1000)/20)/1000000.0)	##1000 Hz (?)
	circ2.set_radius((sum(z_100)/3)/10000000.0)	##100 Hz (?)
	circ3.set_radius((sum(z_6000)/372)/50000.0)	##6000 Hz (?)
    #dt, elapsed = event.dt, event.elapsed
    #for i,circ in enumerate(objects):
    #    circ.move(0.7*dt*np.sin(elapsed*(i+1)), 0.7*dt*np.cos(elapsed*(i+1)))
    #    circ.set_color( (np.abs(np.sin(elapsed*(i+1))),np.abs(np.sin(elapsed*2*(i+1))), np.abs(np.sin(elapsed*3*(i+1))),0.3) )
 

# create objects, register callback and start program. 

win = Canvas() 
objects = []

#for i in range(10):
#	circ = Circle(win, pos=(-0.6+0.05*i,0), radius=0.1,color = (1,0,0,0.2))
#	objects.append(circ)

#coordinates
x1=0.0
y1=0.25
x2=-0.5/np.sqrt(5)
y2=-0.25/np.sqrt(5)
x3=0.5/np.sqrt(5)
y3=-0.25/np.sqrt(5)

circ = Circle(win, pos=(x1,y1),radius = 0.1, color=(1,0,0,0.4))
circ2 = Circle(win, pos=(x2,y2),radius = 0.1, color=(0,1,0,0.4))
circ3 = Circle(win, pos=(x3,y3),radius = 0.1, color=(0,0,1,0.4))

while True:
	win.set_action(action, objects)
	#print z[0]
	win.run()
</code>
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