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newarch.py
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newarch.py
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#!/usr/bin/python3
import cgi
import re
import math
import datetime
import sys
import os
import json
LOGFILE = None # A file to log everything we want
def main(**inputlist):
"""
Doesn't return anything, but in case of success: prints a filename, which
will hence be sent to the web interface.
"""
start_time = datetime.datetime.utcnow().strftime("%Y-%m-%d-%H-%M-%S-%f")
if not inputlist:
data = cgi.FieldStorage().getvalue("data", "")
inputlist = json.loads(data)
else:
data = json.dumps(inputlist)
# Open a log file and append input list to it:
global LOGFILE
with open('log', 'a') as LOGFILE:
log("{} {}".format(start_time, inputlist))
# Create always-positive hash of the request string:
request_hash = str(hash(data) % ((sys.maxsize + 1) * 2))
cached_filename = return_file_if_already_exist(request_hash)
if cached_filename:
print(cached_filename)
elif inputlist:
filename = treat_inputlist(start_time, request_hash, **inputlist)
if filename is None :
log('Something went wrong. Maybe the input list was badly '
'formatted, or had 0 delegates, or had too many delegates.')
else:
print(filename)
else:
log('No inputlist')
def log(message, newline=True):
"""
Add message to LOGFILE.
message : string
Message to append to the LOGFILE
newline : bool
Should we append a \n at the end of the message
"""
LOGFILE.write("{}{}".format(message, '\n' if newline else ''))
def treat_inputlist(start_time, request_hash, parties=(), denser_rows=False, **kwargs):
"""
Generate a new SVG file and return its name.
start_time : str
request_hash : str
parties : Iterable[dict]
A list of dicts with the following format :
{
'name': <str>,
'nb_seats': <int>,
'color': <str> (fill color, as hex code),
'border_size': <float>,
'border_color': <str> (as hex code)
}
denser_rows : bool
kwargs : dict
The rest of the request (should be empty)
"""
# Create a filename that will be unique each time.
# Old files are deleted with a cron script.
svg_filename = "svgfiles/{}-{}.svg".format(start_time, request_hash)
sum_delegates = count_delegates(parties)
if sum_delegates > 0:
nb_rows = get_number_of_rows(sum_delegates)
# Maximum radius of spot is 0.5/nb_rows; leave a bit of space.
radius = 1. / (4*nb_rows-2)
pos_list = get_spots_centers(sum_delegates, nb_rows, radius, denser_rows)
draw_svg(svg_filename, sum_delegates, parties, pos_list, radius)
return svg_filename
def return_file_if_already_exist(request_hash):
"""
If the requested file has been generated before, return its path/filename.
Otherwise, return False
request_hash : str
A unique hash representing a POST request.
"""
for file in os.listdir("svgfiles"):
if file.count(str(request_hash)):
return "svgfiles/{}".format(file)
return False # File doesn't already exist
def count_delegates(party_list):
"""
Sums all delegates from all parties. Return 0 if something fails.
party_list : <list>
Data for each party, a dict with the following format : [
{
'name': <str>,
'nb_seats': <int>,
'color': <str> (fill color, as hex code),
'border_size': <float>,
'border_color': <str> (as hex code)
},
... /* other parties */
]
"""
sum = 0
for party in party_list:
sum += party['nb_seats']
return sum
def get_number_of_rows(nb_delegates):
"""
How many rows will be needed to represent this many delegates.
"""
i = 1
while Totals(i) < nb_delegates:
i += 1
return i
def Totals(rows):
"""
Total number of seats per number of rows in diagram.
Returns the maximal number of seats available for that number of rows
i : int
A number of rows of seats
"""
tot = 0
rad = 1/float(4*rows-2)
for r in range(1, rows+1):
R = .5 + 2*(r-1)*rad
tot += int(math.pi*R/(2*rad))
return tot
def get_spots_centers(nb_delegates, nb_rows, spot_radius, dense_rows):
"""
Returns the position of each single spot, represented as a [angle, x, y] tuple.
nb_delegates : int
nb_rows : int
spot_radius : float
dense_rows : bool
"""
startnumber = 1
if dense_rows:
rows_capacity = []
# fit as many seats as we can in each row, starting from the outermost one
for i in range(nb_rows, 0, -1):
R = .5 + 2*(i-1)*spot_radius
# the max number of seats in this row
max_ = int(math.pi*R/(2*spot_radius))
rows_capacity.append(max_)
if sum(rows_capacity) > nb_delegates:
break
# rows_capacity' length is how many rows we need a minima to store all these delegates
startnumber = nb_rows-len(rows_capacity)+1
total = Totals(nb_rows)
positions = []
for r in range(startnumber, nb_rows+1):
# R : row radius (radius of the circle crossing the center of each seat in the row)
R = .5 + 2*(r-1)*spot_radius
if r == nb_rows: # if it's the last row
# fit all the remaining seats
nb_seats_to_place = nb_delegates-len(positions)
elif dense_rows:
nb_seats_to_place = round(nb_delegates * rows_capacity[nb_rows-r]/sum(rows_capacity))
else:
# fullness of the diagram (relative to the correspondng Totals) times the maximum seats in that row
nb_seats_to_place = int(float(nb_delegates) / total * math.pi*R/(2*spot_radius))
if nb_seats_to_place == 1:
positions.append([math.pi/2.0, 1.0, R])
else:
for j in range(nb_seats_to_place):
# angle of the seat's position relative to the center of the hemicycle
angle = float(j) * (math.pi-2.0*math.asin(spot_radius/R)) / (float(nb_seats_to_place)-1.0) + math.asin(spot_radius/R)
# position relative to the center of the hemicycle
positions.append([angle, R*math.cos(angle)+1, R*math.sin(angle)])
positions.sort(reverse=True)
return positions
def draw_svg(svg_filename, nb_delegates, party_list, positions_list, radius):
"""
Draw the actual <circle>s in the SVG
svg_filename : str
nb_delegates : int
party_list : list<dict>
A list of parties. Each party being a dict with the form {
'name': <str>,
'nb_seats': <int>,
'color': <str> (fill color, as hex code),
'border_size': <float>,
'border_color': <str> (as hex code)}
positions_list : list<3-list<float>
[angle (useless in this function), x, y]
radius : float
Radius of a single spot
"""
with open(svg_filename, 'w') as out_file:
write_svg_header(out_file)
write_svg_number_of_seats(out_file, nb_delegates)
write_svg_seats(out_file, party_list, positions_list, radius)
write_svg_footer(out_file)
def write_svg_header(out_file):
# Write svg header:
out_file.write(
'<?xml version="1.0" encoding="UTF-8" standalone="no"?>\n'
'<svg xmlns:svg="http://www.w3.org/2000/svg"\n'
' xmlns="http://www.w3.org/2000/svg" version="1.1"\n'
# Make 350 px wide, 175 px high diagram with a 5 px blank border
' width="360" height="185">\n'
' <!-- Created with the Wikimedia parliament diagram creator (http://parliamentarch.toolforge.org/archinputform.html) -->\n'
' <g>\n')
def write_svg_number_of_seats(out_file, nb_seats):
# Print the number of seats in the middle at the bottom.
out_file.write(
' <text x="180" y="180" \n'
' style="font-size:36px;font-weight:bold;text-align:center;text-anchor:middle;font-family:sans-serif">{}</text>\n'
.format(nb_seats))
def write_svg_seats(out_file, party_list, positions_list, radius):
"""
Write the main part of the SVG, each party will have its own <g>, and each
delegate will be a <circle> inside this <g>.
out_file : file
party_list : list<dict>
positions_list : list<3-list<float>>
radius : float
"""
drawn_spots = 0
for i in range(len(party_list)):
# Remove illegal characters from party's name to make an svg id
party_name = party_list[i]['name']
sanitized_party_name = re.sub(r'[^a-zA-Z0-9_-]+', '-', party_name)
block_id = "{}_{}".format(i, sanitized_party_name)
party_nb_seats = party_list[i]['nb_seats']
party_fill_color = party_list[i]['color']
party_border_width = party_list[i]['border_size'] * radius * 175 * .8
party_border_color = party_list[i]['border_color']
out_file.write( # <g> header
' <g style="fill:{0}; stroke-width:{1:.2f}; stroke:{2}" \n'
' id="{3}"> \n'.format(
party_fill_color,
party_border_width,
party_border_color,
block_id))
out_file.write( # Party name in a tooltip
' <title>{}</title>\n'.format(party_name.encode('utf-8')))
for j in range(drawn_spots, drawn_spots + party_nb_seats):
x = 5.0 + 175 * positions_list[j][1]
y = 5.0 + 175 * (1 - positions_list[j][2])
r = radius * 175 * .8 - party_border_width / 2.0
out_file.write( # <circle> element
' <circle cx="{0:.2f}" cy="{1:.2f}" r="{2:.2f}"/> \n'
.format(x, y, r))
out_file.write(' </g>\n') # Close <g>
drawn_spots += party_nb_seats
def write_svg_footer(out_file):
out_file.write(
' </g>\n'
'</svg>\n')
if __name__ == '__main__':
main()