blup/staticSinePlasma_neopixel.py

#!/usr/bin/python

# inspired by:
# http://lodev.org/cgtutor/plasma.html

import sys
import time
import math
#import pygame
import colorsys
from neopixel import *


class Plasma(object):
    def __init__(self, width, height):
        self.width = width
        self.height = height

        self.pixelvalues = [[0] * height for i in xrange(width)]
        self.pixelsReady = False
        self.offset = 0
        self.update()

    @property
    def minValue(self):
        return min(map(min, self.pixelvalues))

    @property
    def maxValue(self):
        return max(map(max, self.pixelvalues))

    def applyPalette(self, palette):
        min = self.minValue
        max = self.maxValue
        norm = lambda x: ((x - min) / max)

        pixeldata = [ [None] * self.height for i in xrange(self.width) ]

        for x in xrange(self.width):
            rowvalues = self.pixelvalues[x]
            for y in xrange(self.height):
                pixeldata[x][y] = palette.getColorValue(norm(rowvalues[y]))

        return pixeldata

    def update(self):
        #if self.pixelsReady:
        #    return
        self.offset += 1

        for x in xrange(self.width):
            for y in xrange(self.height):
                xx = x+self.offset
                yy = y+self.offset
                #xx = 10*x+self.offset
                #yy = 10*y+self.offset
                p = 128 + 128 * math.sin(xx / 9.0)
                p += 128 + 128 * math.sin(yy / 16.0)
                p += 128 + 128 * math.sin((yy + xx) / 16.0)
                p += 128 + 128 * math.sin(math.sqrt(yy*yy + xx*xx) / 16.0)
                p += 128 + 8 * math.sin(math.sqrt(yy* xx) / 16.0)
                self.pixelvalues[x][y] = p
        self.pixelsReady = True

class Palette(object):
    def __init__(self):
        self.offset = 0
        self.cache = {}

    def getColorValue(self, x):
        x = round(x, 3)
        if self.cache.has_key(x):
            return self.cache[x]
        c = colorsys.hsv_to_rgb((x + self.offset) % 1, 1, 1)
        #c = map(lambda x: int(x * 7), c)
        depth = 255
        c = map(lambda x: int(x * depth), c)
        self.cache[x] = c
        return c

    def update(self):
        self.cache = {}
        self.offset += 0.01
        if self.offset > 1:
            self.offset -= 1

##############################################

w = 22
h = 16

#w = 80
#h = 18

scalex = 30
scaley = 60

plasma = Plasma(w,h)
palette= Palette()

#screen = pygame.display.set_mode((w*scalex, h*scaley))
#pygame.display.update()

##dim = blup.frame.FrameDimension(w, h, 8, 3)
#dim = blup.frame.FrameDimension(w, h, 8, 3)
##out = blup.output.getOutput('serialblup:/dev/ttyUSB0:115200')
##out = blup.output.getOutput('colorfulshell')
##out = blup.output.getOutput('e3blp:bastel0:4242')
#out = blup.output.getOutput('e3blp')


# LED strip configuration:
LED_COUNT      = 352      # Number of LED pixels.
LED_PIN        = 13      # GPIO pin connected to the pixels (must support PWM!).
LED_FREQ_HZ    = 800000  # LED signal frequency in hertz (usually 800khz)
LED_DMA        = 5       # DMA channel to use for generating signal (try 5)
LED_BRIGHTNESS = 50      # Set to 0 for darkest and 255 for brightest
LED_INVERT     = False   # True to invert the signal (when using NPN transistor level shift)
LED_PWM        = 1

strip = Adafruit_NeoPixel(LED_COUNT, LED_PIN, LED_FREQ_HZ, LED_DMA, LED_INVERT, LED_BRIGHTNESS, LED_PWM)
strip.begin()

while True:
    #screen.fill((0,0,0))

    #print 'updating palette...'
    palette.update()
    #print 'updating plasma...'
    plasma.update()
    #print 'applying palette...'
    pixeldata = plasma.applyPalette(palette)

    #print 'drawing...'
    #f = blup.frame.Frame(dim)
    for y in xrange(h):
        for x in xrange(w):
            if x%2 == 0:
                lednum = x*h + y
            else:
                lednum = x*h - y + 15
            strip.setPixelColor(lednum, Color(*pixeldata[x][y]))
    strip.show()
    #print 'done drawing'

    #out.sendFrame(f)

    #pygame.display.update()
    #print 'done updating'
    #time.sleep(0.01)