#!/usr/bin/env python

import pyglet
import math

import random
import time

import serial

datafeed = serial.Serial(
 port='/dev/ttyUSB0',
 baudrate = 9600,
 parity=serial.PARITY_NONE,
 stopbits=serial.STOPBITS_ONE,
 bytesize=serial.EIGHTBITS,
 timeout=1
)

red = [1, 0, 0]
green = [0, 1, 0]

blue = [0.2, 0.5, 1]

window = pyglet.window.Window(800, 480, resizable=True)

window.set_caption("Raw data")

starttime = time.time()

def drawgrid(target, xlines, ylines, xlimits, ylimits):

    pyglet.gl.glColor3f(0.5, 0.5, 0.5) 

    for xpos in range(0, target.width, target.width/xlines):
        pyglet.graphics.draw(2, pyglet.gl.GL_LINES, ('v2i', (xpos, 0, xpos, target.height)))
        tagtext = str(round((xlimits[1]-xlimits[0])*(float(xpos)/target.width) + xlimits[0], 1))

        tag = pyglet.text.Label(tagtext, font_name='Arkhip', font_size=10, x=xpos-2, y=0, anchor_x='right', anchor_y='bottom')
        tag.draw()

    for ypos in range(0, target.width, target.height/ylines):
        pyglet.graphics.draw(2, pyglet.gl.GL_LINES, ('v2i', (0, ypos, target.width, ypos)))
        tagtext = str(round((ylimits[1]-ylimits[0])*(float(ypos)/target.height) + ylimits[0], 1))

        tag = pyglet.text.Label(tagtext, font_name='Arkhip', font_size=10, x=0, y=ypos-2, anchor_x='left', anchor_y='top')
        tag.draw()

def plotline(target, xdata, ydata, colour):

    pyglet.gl.glColor3f(colour[0], colour[1], colour[2])

    points = []
    for n in range(max(len(xdata), len(ydata))):

        try:

            xpos = ((xdata[n]-min(xdata))*target.width)/(max(xdata)-min(xdata))

        except:
            xpos = 0

        xpos = int(xpos)

        try:

            ypos = ((ydata[n]-min(ydata))*target.height)/(max(ydata)-min(ydata))

        except:
            ypos = 0

        ypos = int(ypos)
        points.append([xpos, ypos])
    for n in range(len(points)-1):            
        pyglet.graphics.draw(2, pyglet.gl.GL_LINES, ('v2i', (points[n][0], points[n][1], points[n+1][0], points[n+1][1])))

xdata = [0]
ydata = [0]

ydatasmooth = [0]

def poll_serial(foo):

    max_points = 250

    value = datafeed.readline()
    try:
        value = float(value)
        ydata.append(value)

        if len(ydata) > max_points:

            del ydata[0]

        xdata.append(round(time.time() - starttime, 3))

        if len(xdata) > max_points:

            del xdata[0]

            
        avg = 0;
        for n in range(0, len(ydata)):
            weight = (1-float(n/len(ydata)))/max_points
            avg += weight * ydata[n]
            
        ydatasmooth.append(avg)
        if len(ydatasmooth) > max_points:
            del ydatasmooth[0]
            

    except:
        pass

    
pyglet.clock.schedule_interval(poll_serial, 0.01)

def drawgraph(target, xpoints, ypoints, colour):
    plotline(target, xpoints, ypoints, colour)
    drawgrid(target, 16, 10, [min(xpoints), max(xpoints)], [min(ypoints), max(ypoints)])

@window.event
def on_draw():
    window.clear()

    drawgraph(window, xdata, ydata, blue)

    
pyglet.app.run()