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weathersvg.py
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weathersvg.py
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"""
weathersvg.py: a series of utilities to produce small SVG outputs
of useful weather data.
"""
from __future__ import print_function
import os
import re
import svgwrite
import logging
def fix_missing(value):
"""
If there's a missing value for a number, return two dashes. Otherwise,
return the number.
"""
try:
if value == '' or value is None:
return '--'
return value
except Exception as exc:
logging.error('Returning a missing value string: %s', exc)
return '--'
def precip_chance_svg(morning, evening, filename, outputdir='/tmp/', iconheight=50):
"""
Take the day's precip chances and produce a color-coded svg of percentages.
"""
fontheight = (iconheight / 2) - 2
svg_info = {'high_coords': (8, fontheight),
'low_coords': (2, iconheight - 2),
'dimensions': (65, iconheight),
'colors': ['#baa87d', '#7ae6c0', '#2bb5aa', '#023dbd', '#035740'],
'fontcolor': 'white',
'fontheight': fontheight
}
bgc = svg_info['colors'][int(max(morning, evening)/100.0 * (len(svg_info['colors']) - 1))]
if not re.search(r'%$', str(evening)):
evening = '{0}%'.format(evening)
if not re.search(r'%$', str(morning)):
morning = '{0}%'.format(morning)
style1 = '''.{stylename} {openbrace} font: bold {fontsize}px sans-serif;
fill:{fontcolor}; stroke:#000000; stroke-width:2px; stroke-linecap:butt;
stroke-linejoin:miter; stroke-opacity:0.5; {closebrace}'''
dwg = svgwrite.Drawing(os.path.join(outputdir, filename),
size=svg_info['dimensions'])
dwg_styles = svgwrite.container.Style(content='.background {fill: ' + bgc +
'; stroke: #f0f0f0f0;}')
dwg_styles.append(content=style1.format(stylename='morning', openbrace='{',
fontsize=fontheight, fontcolor='#f2df94',
closebrace='}'))
dwg_styles.append(content=style1.format(stylename='evening', openbrace='{',
fontsize=fontheight, fontcolor='#ffd4fb',
closebrace='}'))
dwg.defs.add(dwg_styles)
evening = fix_missing(evening)
morning = fix_missing(morning)
evening_text = svgwrite.text.TSpan(text=evening,
insert=svg_info['high_coords'],
class_='evening')
morning_text = svgwrite.text.TSpan(text=morning,
insert=svg_info['low_coords'],
class_='morning')
frame = svgwrite.shapes.Rect(insert=(0, 0),
size=svg_info['dimensions'],
class_='background')
text_block = svgwrite.text.Text('', x='0', y='0')
text_block.add(evening_text)
text_block.add(morning_text)
dwg.add(frame)
dwg.add(text_block)
dwg.save(pretty=True)
return 0
def high_low_svg(high, low, filename, outputdir='/tmp/', iconheight=50, iconwidth=50):
"""
Use svgwrite to make a simple graphic with high/low temps for the day's
forecast.
Unicode deg-Celsius is U+2103 (only for UTF-16)
Unicode deg-Fahrenheit is U+2109 (only for UTF-16)
Unicode degree symbol is U+00B0 ('\xb0') -- same as Latin-1 encoding, but is
not available in 1963-standard 7-bit ASCII
"""
fontheight = (iconheight / 2) - 2
svg_info = {'high_coords': (3, fontheight),
'low_coords': (3, iconheight - 2),
'dimensions': (iconwidth, iconheight),
'colors': ['#baa87d', '#7ae6c0', '#2bb5aa', '#023dbd', '#035740'],
'fontcolor': ['blue', 'red', 'white'],
'fontheight': fontheight
}
# high_coords = (3, 18)
# low_coords = (3, 40)
# dimensions = (iconheight, iconwidth)
style1 = '.{stylename} {openbrace} font: bold {fontsize}px sans-serif;\
fill:{fontcolor}; stroke:#000000; stroke-width:1px; stroke-linecap:butt;\
stroke-linejoin:miter; stroke-opacity:0.7; {closebrace}'
dwg = svgwrite.Drawing(os.path.join(outputdir, filename), size=svg_info['dimensions'])
dwg_styles = svgwrite.container.Style(content='.background {fill: #f0f0f0f0; stroke: #f0f0f0f0;}')
dwg_styles.append(content=style1.format(stylename='low', openbrace='{',
fontsize=fontheight,
fontcolor=svg_info['fontcolor'][0],
closebrace='}'))
dwg_styles.append(content=style1.format(stylename='high', openbrace='{',
fontsize=fontheight + 2,
fontcolor=svg_info['fontcolor'][1],
closebrace='}'))
dwg.defs.add(dwg_styles)
high = fix_missing(high)
low = fix_missing(low)
high_symbol = (unicode(high) + u'\xb0')
low_symbol = (unicode(low) + u'\xb0')
high_text = svgwrite.text.TSpan(text=high_symbol,
insert=svg_info['high_coords'], class_='high')
low_text = svgwrite.text.TSpan(text=low_symbol,
insert=svg_info['low_coords'], class_='low')
text_block = svgwrite.text.Text('', x='0', y='0')
text_block.add(high_text)
text_block.add(low_text)
dwg.add(text_block)
dwg.save(pretty=True)
return 0
def make_forecast_icons(fc_dict, outputdir='/tmp/'):
"""
Write out SVG icons of the next three days of temps and precip chances.
"""
filelabel = 'today_{fctype}_plus_{day}.svg'
for i in range(0, 3):
high_low_svg(fc_dict[i]['high'], fc_dict[i]['low'],
filelabel.format(fctype='temp', day=i),
outputdir=outputdir
)
precip_chance_svg(int(fc_dict[i]['precip_morning']),
int(fc_dict[i]['precip_evening']),
filename=filelabel.format(fctype='precip', day=i),
outputdir=outputdir
)
return True
def assign_icon(description, icon_match):
"""
Try to parse the language in forecasts for each to and match to an
appropriate weather SVG icon.
"""
if description == ''
logging.warn('No description available for icon match. Returning NA.')
return 'wi-na.svg'
returnvalue = ''
description = description.strip().lower()
description = re.sub(r'\s+', ' ', description)
logging.info('Finding icon for "%s"', description)
logging.debug('Found %s items in icon list.', len(icon_match.keys()))
for key, value in icon_match.iteritems():
logging.debug('Evaluating key %s and list %s', key, value)
for val in value:
if description == val.lower().strip():
returnvalue = key
logging.info('Matched "%s"', val)
return returnvalue
logging.warn('Unable to match "%s"', description)
return 'wi-na.svg'
def css_string(css_dict):
"""
Convenience function to format a dict into a css_friendly string.
"""
stylestring = '{'
for key, value in css_dict.iteritems():
stylestring = '{0}{1}:{2}; '.format(stylestring, key, value)
stylestring = stylestring + '}'
return stylestring
def draw_compass_svg(degrees, data):
"""
Drawing raw SVG via text and python.
"""
wcd = data['defaults']['wind_compass']
# raw_svg_header = '<?xml version="1.0" encoding="utf-8"?>'
svg_invocation = '''<svg height="{height}" width="{width}" version="1.1" id="{id_label}"
xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"
x="0px" y="0px" viewBox="{viewbox}"
style="enable-background:new {viewbox};" xml:ispace="preserve">'''
circle_css = data['defaults']['circle_css']
rot1_css = data['defaults']['rot1_css']
rot1_css['transform'] = 'rotate({0}deg)'.format(degrees)
svg_css = '<style>circle {0} .rot1 {1}</style>'.format(css_string(circle_css),
css_string(rot1_css))
# symbol = '<symbol id="whole-icon"> <g class="rot1">
# <circle cx="20" cy="20" r="17" id="ring"/>
# <path d="M20 7 L 27 30 L 20 26 L 13 30 L 20 7 z" id="arrow" /></g> </symbol>'
# raw_svg_footer = '<use xlink:href="#whole-icon"/></svg>'
svg_string = '{0}{1}{2}{3}'.format(svg_invocation.format(height=wcd['height'],
width=wcd['width'],
id_label=wcd['id_label'],
viewbox=wcd['viewbox']),
svg_css, wcd['symbol'], wcd['raw_svg_footer'])
# print(svg_string)
return svg_string
def wind_direction_icon(heading, sourcepath='static/icons/weather-icons-master/svg'):
"""
Generate the html for the appropriately rotated SVG file for
the wind direction.
"""
filename = 'wi-wind-deg.svg'
filepath = os.path.join(sourcepath, filename)
img_html = '''<img src="{0}" width="50" height="50" fill="white"
transform="rotate({1},20,20)" />'''.format(filepath, int(heading))
logging.debug('image HTML: %s', img_html)
return img_html