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incidents.py
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incidents.py
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# Display WMATA Metrorail times on a dot-matrix display
# Copyright (C) 2020 Kenneth Schneider
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
import traceback
from rgbmatrix import RGBMatrix, RGBMatrixOptions, graphics
import time
import sys
import requests
import logging
def init_matrix():
options = RGBMatrixOptions()
options.rows = 32
options.chain_length = 4
options.pwm_bits = 3
options.pwm_lsb_nanoseconds = 300
options.gpio_slowdown = 2
return RGBMatrix(options = options)
def get_incidents(lines_requested, api_key):
messages = []
try:
headers = {"api_key":api_key, "Accept":"application/json"}
resp = requests.get('https://api.wmata.com/Incidents.svc/json/Incidents', headers=headers)
logging.info("Attempting to get train data!")
if resp.status_code != 200:
logging.error("Error getting train data! Response status code: ", resp.status_code)
else:
resp_json = resp.json()
logging.info("Attemtpting to read JSON")
for incident in resp_json['Incidents']:
logging.info("Incident: {}".format(incident))
logging.info("I am looping")
# Grab the lines, strip the strings afterward because
# if we split on '; ' instead of ';' we miss the single
# string case
lines_affected = incident['LinesAffected'].split(';')
logging.info("Lines: {}".format(lines_requested))
logging.info(lines_affected)
for index, line in enumerate(lines_affected):
lines_affected[index] = line.strip()
logging.info(set(lines_requested).intersection(lines_affected))
if bool(set(lines_requested).intersection(lines_affected)):
if incident['Description']:
desc = incident['Description'].replace("\n", " ")
messages.append(desc)
logging.info("matched!")
except Exception:
tb = traceback.format_exc()
traceback.print_exc()
logging.error("well that went wrong...")
logging.error(tb)
logging.info(messages)
return messages
def compute_offset(line):
pxLength = len(line) * 6
offset = (128 - pxLength) / 2
return offset
def add_line(line, lines):
offset = compute_offset(line)
lines.append((line, offset))
def divide_lines(words, lines):
line = words[0]
for word in words[1:]:
if len(line) < 21 and len(word) + 1 + len(line) < 21:
line += ' ' + word
else:
add_line(line, lines)
line = word
# Add in last line
add_line(line, lines)
def split_by_length_in_place(words):
for index, word in enumerate(words):
n = len(word)
if n > 21:
insert_offset = 0
for x in range(0, n, 20):
if x == 0:
words[index] = word[x : x + 20] + '-'
else:
word_extension = word[x : x + 20]
if len(word_extension) >= 20:
word_extension += '-'
words.insert(index + insert_offset, word_extension)
insert_offset += 1
return words
def draw_message(canvas, message, font_file):
logging.info("Got to draw message")
font = graphics.Font()
font.LoadFont(font_file)
red_color = graphics.Color(255,0,0)
yellow_color = graphics.Color(200,125,0)
title_divided = message.split(': ', 1)
title = ''
if len(title_divided) == 1:
words = split_by_length_in_place(message.split(' '))
elif len(title_divided) == 2:
title = split_by_length_in_place(title_divided[0])
words = split_by_length_in_place(title_divided[1].split(' '))
else:
words = split_by_length_in_place(message.split(' '))
logging.error("Error! Title divided length > 2")
title_lines = []
# Shouldn't need to worry about a word
# longer than 21 for now since Silver/Blue/Orange
# is the max # of metro lines per alert assuming all lines
# is all lines
if title != '':
divide_lines(title.split(' '), title_lines)
lines = []
divide_lines(words, lines)
height_delta = 8
logging.info("Drawing lines")
for index, title_line in enumerate(title_lines):
lines.insert(index, title_line)
for i in range(0, len(lines), 4):
if len(lines) - i < 4:
lines_to_display = len(lines) - i
else:
lines_to_display = 4
for x in range(0,lines_to_display):
color = yellow_color
if i+x <= len(title_lines)-1:
color = red_color
graphics.DrawText(canvas, font, lines[i+x][1], 7 + x*height_delta, color, lines[i+x][0])
time.sleep(5)
canvas.Clear()
def draw_incident(canvas, font_file, message):
logging.info("Got to draw incident")
height_delta = 8
width_delta = 6
total_width = 128
font = graphics.Font()
font.LoadFont(font_file)
red_color = graphics.Color(255,0,0)
yellow_color = graphics.Color(200,125,0)
green_color = graphics.Color(50,150,0)
canvas.Clear()
for y in range(0, 8):
for x in range(0, 32):
x0 = x * 4
x1 = x0 + 3
if x % 2 == 0 and y <= 3:
graphics.DrawLine(canvas, x0, y, x1, y, yellow_color)
elif x % 2 != 0 and y > 3:
graphics.DrawLine(canvas, x0, y, x1, y, yellow_color)
logging.info("Got past drawing squares")
if "scheduled maintenance" in message or "scheduled track work" in message:
graphics.DrawText(canvas, font, 1, 15, red_color, "SCHEDULED")
graphics.DrawText(canvas, font, 1, 23, red_color, "TRACK WORK")
logging.info("Drawing scheduled track workd")
else:
logging.info("Drawing service advisory")
service = "SERVICE"
advisory = "ADVISORY"
graphics.DrawText(canvas, font, compute_offset(service), 15, red_color, service)
graphics.DrawText(canvas, font, compute_offset(advisory), 23, red_color, advisory)
for y in range(24, 32):
for x in range(0, 32):
x0 = x * 4
x1 = x0 + 3
if x % 2 == 0 and y <= 27:
graphics.DrawLine(canvas, x0, y, x1, y, yellow_color)
elif x % 2 != 0 and y > 27:
graphics.DrawLine(canvas, x0, y, x1, y, yellow_color)
logging.info("Got past drawing other squares")
time.sleep(5)
canvas.Clear()
draw_message(canvas, message, font_file)
if __name__ == '__main__':
if len(sys.argv) != 3:
print("Usage incidents.py <api_key> <font_file>")
sys.exit(2)
api_key = sys.argv[1]
font_file = sys.argv[2]
matrix = init_matrix()
messages = get_incidents(['SV', 'OR', 'GR'], api_key)
for message in messages:
draw_incident(matrix, message, font_file)