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#!/usr/bin/env python
# render.py
# Experiments with using the mathtext expression rendering library
# on top of a cairo drawing surface.
#
# based on
#
# http://code.google.com/p/mathtex/
# http://gsoc-mathtex.blogspot.com/
#
# http://www.oluyede.org/blog/writing-a-widget-using-cairo-and-pygtk-28/
# http://www.tortall.net/mu/wiki/PyGTKCairoTutorial
import pygtk
import gtk, gobject, cairo
from mathtex.parser import MathtexParser
from mathtex.boxmodel import ship
from mathtex.fonts import BakomaFonts
from mathtex.fonts import StixFonts
from mathtex.backends.backend_cairo import MathtexBackendCairo
class MathCell(gtk.DrawingArea):
"""Cell for display of maths."""
__gsignals__ = { "expose-event": "override" }
def __init__(self):
gtk.DrawingArea.__init__(self)
self.parser = MathtexParser()
self.bakoma = BakomaFonts()
self.stix = StixFonts()
# # self.parser.parse(r"$R_{\mu\nu\rho}{}^{\sigma} = \nabla_\mu F_{\nu\rho}^\sigma$",
self.box = \
self.parser.parse(r"$x_{1,2}=\frac{-b \pm \sqrt{b^2 - 4ac}}{2a}$",
self.bakoma, 18, 99.0)
self.rects, self.glyphs, self.bbox = ship(0, 0, self.box)
def do_expose_event(self, event):
cr = self.window.cairo_create()
cr.rectangle(event.area.x, event.area.y,
event.area.width, event.area.height)
cr.clip()
width = self.bbox[2] - self.bbox[0]
height = self.box.height
depth = self.box.depth
backend = MathtexBackendCairo()
backend.set_canvas_size(self.box.width, self.box.height,
self.box.depth, 100)
backend.render(self.glyphs, self.rects)
backend.render_to_context(cr)
# self.draw(cr, *self.window.get_size())
def draw(self, cr, width, height):
cr.set_source_rgb(0.5, 0.5, 0.7)
cr.rectangle(0.5, 0.5, .5*width, .5*height)
cr.fill()
def run(Widget):
window = gtk.Window()
window.connect("delete-event", gtk.main_quit)
widget = MathCell()
widget.show()
window.add(widget)
window.present()
gtk.main()
if __name__ == "__main__":
run(MathCell)
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