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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
Example for using Helios DAC libraries in python (using C library with ctypes)
NB: If you haven't set up udev rules you need to use sudo to run the program for it to detect the DAC.
"""
import ctypes
#Define point structure
class HeliosPoint(ctypes.Structure):
#_pack_=1
_fields_ = [('x', ctypes.c_uint16),
('y', ctypes.c_uint16),
('r', ctypes.c_uint8),
('g', ctypes.c_uint8),
('b', ctypes.c_uint8),
('i', ctypes.c_uint8)]
#Load and initialize library
HeliosLib = ctypes.cdll.LoadLibrary("./libHeliosDacAPI.dylib")
numDevices = HeliosLib.OpenDevices()
#92,102,74
#visible=
on=(85,100,70)
points=[
[0.0,[0,0,0]],
[0.1,[85,100,70]],
[1.0,[255,255,255]]]
gamma=(1.0,1.0,1.0)
amount=1.0
pkeys=[]
for p in points:
pkeys.append(points[i][0])
for i in range(0,len(points)):
if points[i][0] >= amount:
if i==0:
grey=points[0]
break
subsample=amount-p[i-1][0]/(p[i][0]-p[i-1][0])
grey=[x * subsample for x in l]
(points[i][1]*subsample)+(points[i-1][1]*subsample)
#Create sample frames
frames = [0 for x in range(30)]
frameType = HeliosPoint * 1000
x = 0
y = 0
for i in range(30):
y = round(i * 0xFFF / 30)
frames[i] = frameType()
for j in range(1000):
if (j < 500):
x = round(j * 0xFFF / 500)
else:
x = round(0xFFF - ((j - 500) * 0xFFF / 500))
frames[i][j] = HeliosPoint(int(x),int(y),
int(amount*(255-grey[0])+grey[0]),
int(amount*(255-grey[1])+grey[1]),
int(amount*(255-grey[2])+grey[2]),
0)
#Play frames on DAC
for i in range(30):
for j in range(numDevices):
while (HeliosLib.GetStatus(j) == 0): #Wait for ready status
pass
HeliosLib.WriteFrame(0, 20000, 0, ctypes.pointer(frames[i % 30]), 1000) #Send the frame
HeliosLib.CloseDevices()
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