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servicenow-chat-alert/yoctoLib.python.26380/Examples/Prog-Display-Sequence/DisplaySequence.py
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DisplaySequence.py
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#!/usr/bin/python
# -*- coding: utf-8 -*-
import os, sys
import math
# add ../../Sources to the PYTHONPATH
sys.path.append(os.path.join("..", "..", "Sources"))
from array import *
from yocto_api import *
from yocto_display import *
def usage():
scriptname = os.path.basename(sys.argv[0])
print("Usage:")
print(scriptname + ' <serial_number>')
print(scriptname + ' <logical_name>')
print(scriptname + ' any ')
sys.exit()
def die(msg):
sys.exit(msg + ' (check USB cable)')
errmsg = YRefParam()
if len(sys.argv) < 2: usage()
target = sys.argv[1]
# Setup the API to use local USB devices
if YAPI.RegisterHub("usb", errmsg) != YAPI.SUCCESS:
sys.exit("init error" + errmsg.value)
if target == 'any':
# retreive any display
disp = YDisplay.FirstDisplay()
if disp is None:
die('No module connected')
else:
disp = YDisplay.FindDisplay(target + ".display")
if not disp.isOnline():
die("Module not connected ")
disp.resetAll()
# retreive the display size
w = disp.get_displayWidth()
h = disp.get_displayHeight()
# reteive the first layer
l0 = disp.get_displayLayer(0)
count = 8
coord = array.array('b')
for i in range(1, 2 * count): coord.append(0)
# precompute the "leds" position
ledwidth = int(w / count)
for i in range(0, count):
coord[i] = i * ledwidth
coord[2 * count - i - 2] = coord[i]
framesCount = 2 * count - 2
# start recording
disp.newSequence()
# build one loop for recording
for i in range(0, framesCount):
l0.selectColorPen(0)
l0.drawBar(coord[(i+framesCount-1) % framesCount], h-1,coord[(i+framesCount-1) % framesCount]+ledwidth, h-4)
l0.selectColorPen(0xffffff)
l0.drawBar(coord[i], h - 1, coord[i] + ledwidth, h - 4)
disp.pauseSequence(50) # records a 50ms pause.
# self-call : causes an endless looop
disp.playSequence("K2000.seq")
# stop recording and save to device filesystem
disp.saveSequence("K2000.seq")
# play the sequence
disp.playSequence("K2000.seq")
YAPI.FreeAPI()
print("This animation is running in background.")
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