kraken_xbteur.py

#!/usr/bin/env python3
market, period = 'XBTEUR', 60
imgw, imgh = 22, 22
import krakenex
from pykrakenapi import KrakenAPI
api = krakenex.API()
k = KrakenAPI(api)
ohlc, last = k.get_ohlc_data(market, period)
a = ohlc.to_numpy()
a = a[:imgw,:]
rows, cols = a.shape
a_open, a_high, a_low, a_close = a[:,1], a[:,2], a[:,3], a[:,4]
a_min, a_max = min(a_open.min(), a_close.min()), max(a_open.max(), a_close.max())
n_open = (a_open - a_min) / (a_max - a_min)
n_high = (a_high - a_min) / (a_max - a_min)
n_low = (a_low - a_min) / (a_max - a_min)
n_close = (a_close - a_min) / (a_max - a_min)
from PIL import Image, ImageDraw
im = Image.new('RGB', (imgw, imgh))
draw = ImageDraw.Draw(im)
for x in range(imgw):
    if n_open[x] > n_close[x]:
        c, ch = (255, 0, 0), (127, 0, 0)
    else:
        c, ch = (0, 255, 0), (0, 127, 0)
    draw.line((imgw-x, (1-n_low[x])*imgh, imgw-x, (1-n_high[x])*imgh), fill=ch)
    draw.line((imgw-x, (1-n_open[x])*imgh, imgw-x, (1-n_close[x])*imgh), fill=c)
#im.save('kraken_xbteur.png', format='PNG')
from io import BytesIO
imdata = BytesIO()
im.save(imdata, format='PNG')
import base64
import json
print(json.dumps({
    'text': f'{market} {int(a[0,4])}',
    'icon_data': base64.b64encode(imdata.getvalue()).decode('ascii'),
    'background_color': '0,0,0,255',
    'font_color': '200,200,200,255',
    'font_size': 12
}))