plotdevice-libs/web/mathtex.py at master · plotdevice/plotdevice-libs · GitHub

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### MATHTEX ##########################################################################################

# Author: Tom De Smedt, Cedric Foellmi.

# See LICENSE.txt for details.

from .url import URLAccumulator

from urllib.parse import quote

from .cache import Cache

def clear_cache():

Cache("mathtex").clear()

class mathTeX(URLAccumulator):

""" The mathTeX server returns a GIF or PNG-image for a LaTeX math expression.

http://www.forkosh.com/mathtex.html

"""

def __init__(self, eq, type="png", dpi=120, color="", wait=10, asynchronous=False):

eq = "\\"+type+" "+eq

eq = "\dpi{"+str(dpi)+"} " + eq

if color:

eq = "\\usepackage{color} \color{"+color+"} " + eq

print(eq)

url = "http://www.forkosh.dreamhost.com/mathtex.cgi?"+quote(eq)

URLAccumulator.__init__(self, url, wait, asynchronous, "mathtex", type="."+type, throttle=1)

def load(self, data):

# Provide the path to the image stored in cache.

self.image = self._cache.hash(self.url)

def gif(eq, dpi=120, color=""):

return mathTeX(eq, type="gif", dpi=dpi, color=color).image

def png(eq, dpi=120, color=""):

return mathTeX(eq, type="png", dpi=dpi, color=color).image

def png300(eq, color=""):

return png(eq, color, 300)

#eq = "E = hf = \frac{hc}{\lambda} \,\! "

#image(gif(eq), 10, 10)