print_png_from_latex.py

import os
import sys
from functools import partial
import matplotlib
matplotlib.use('Qt4Agg')
matplotlib.rcParams['backend.qt4'] = 'PySide'
import matplotlib.pyplot as plt
from matplotlib.pyplot import figure
from PySide import QtGui

# noinspection PyArgumentList


def main():
    app = QtGui.QApplication.instance()  # checks if QApplication already exists
    if not app:  # create QApplication if it doesnt exist
        app = QtGui.QApplication(sys.argv)
    main_form = QtGui.QWidget()
    open_button = QtGui.QPushButton(parent=main_form)
    open_button.clicked.connect(partial(generate_latex))
    open_button.setText('LaTex to png')
    open_button.setIcon(QtGui.QIcon('glyphicons-145-folder-open.png'))
    main_form.show()
    main_form.adjustSize()
    sys.exit(app.exec_())


def generate_latex():
    file_name, ext = QtGui.QFileDialog.getOpenFileName(
        parent=None,
        caption='open', directory='.',
        filter='Text description of LaTeX (*.txt)')
    if os.path.exists(file_name):
        with open(file_name) as f:
            data = f.read()
        tex_to_add = r"$" + data + r"$"
        fig = figure(figsize=(1, 1))
        ax = fig.add_axes([0, 0, 1, 1], frameon=False)
        ax.set_axis_off()
        # add text
        plt.text(0, 0, tex_to_add, fontsize=60)
        # save
        plt.savefig(
            os.path.splitext(
                os.path.basename(file_name))[0] +
            '.png',
            bbox_inches='tight',
            transparent=True,
            frameon=False,
            edgecolor=None)
        # show
        plt.show()

if __name__ == '__main__':
    main()