[enh] adds a colorcycle filter

clitools/filters/colorcycle.py

@@ -0,0 +1,103 @@
+#!/usr/bin/python3
+# -*- coding: utf-8 -*-
+# -*- mode: Python -*-
+
+
+'''
+
+colorcycle
+v0.1.0
+
+A simple effect : cycle colors 
+
+LICENCE : CC
+
+by cocoa 
+
+
+'''
+from __future__ import print_function
+import sys
+import ast
+import os
+import argparse
+import random
+import time 
+name = "filters::cycle"
+
+argsparser = argparse.ArgumentParser(description="Redis exporter LJ")
+argsparser.add_argument("-x","--centerX",help="geometrical center X position",default=300,type=int)
+argsparser.add_argument("-y","--centerY",help="geometrical center Y position",default=300,type=int)
+argsparser.add_argument("-f","--fps",help="Frame Per Second",default=30,type=int)
+argsparser.add_argument("-v","--verbose",action="store_true",help="Verbose")
+
+args    = argsparser.parse_args()
+fps     = args.fps
+centerX = args.centerX
+centerY = args.centerY
+verbose = args.verbose
+
+optimal_looptime = 1 / fps
+
+UP                  = 5
+DOWN                = -5
+currentColor        = [0,0,0]
+composant           = 0
+currentDirection    = UP
+
+def debug(*args, **kwargs):
+    if( verbose == False ):
+        return
+    print(*args, file=sys.stderr, **kwargs)
+
+def rgb2int(rgb):
+    return int('0x%02x%02x%02x' % tuple(rgb),0)
+
+def cycleColor( pl ):
+
+    global composant
+    global currentDirection 
+    # debug(name,"pl:{}".format(pl)) 
+    value = currentColor[composant]
+    if currentDirection == UP:
+        target = 255
+    else:
+        target = 0
+    value += currentDirection
+    currentColor[composant] = value
+
+    debug(name,"currentColor:{}".format(currentColor))
+    for i in range( 0, len(pl)):
+        pl[i][2] = rgb2int( currentColor)
+
+    # change the composant if target reached
+    if value == target:
+        composant = random.randint( 0,2)
+        value = currentColor[composant]
+        if value == 0 :
+            currentDirection = UP
+        else: 
+            currentDirection = DOWN
+    #debug( "pl:{}".format(pl)) 
+    return pl 
+
+  
+try:
+    while True:
+      start = time.time()
+      line = sys.stdin.readline()
+      if line == "":
+         time.sleep(0.01)
+      line = line.rstrip('\n')
+      pointsList = ast.literal_eval(line)
+      # Do the filter
+      result = cycleColor( pointsList ) 
+      print( result, flush=True )
+      looptime = time.time() - start
+      # debug(name+" looptime:"+str(looptime))
+      if( looptime < optimal_looptime ):
+        time.sleep( optimal_looptime - looptime)
+        # debug(name+" micro sleep:"+str( optimal_looptime - looptime))
+except EOFError:
+    debug(name+" break")# no more information
+