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    <p>I've used the dvipng route several times before, but in python. It's a common path, that lots of people have taken. Here's the code, to give you something to get started, and in case anyone wants Python code. <strong>I do realise you asked for C/C++; this is for a starter, or for others.</strong> This is for generating equations, but it would be trivial to adapt it for more general structures. It does support packages.</p> <p>In terms of integrating it transparently, I feel your pain. Not everyone has tex / latex of course, and if they don't, it's often a pain to get. The best way to do it, I think, is to provide that functionality as a web service - but of course that's not always an option.</p> <p>Finally, note all the options for dvipng. They control the appearance, via various anti-alisaing options etc. I tuned them extensively to get what I thought looked good.</p> <pre><code>def geneq(f, eq, dpi, wl, outname, packages): # First check if there is an existing file. eqname = os.path.join(f.eqdir, outname + '.png') # Open tex file. tempdir = tempfile.gettempdir() fd, texfile = tempfile.mkstemp('.tex', '', tempdir, True) basefile = texfile[:-4] g = os.fdopen(fd, 'w') preamble = '\documentclass{article}\n' for p in packages: preamble += '\usepackage{%s}\n' % p preamble += '\pagestyle{empty}\n\\begin{document}\n' g.write(preamble) # Write the equation itself. if wl: g.write('\\[%s\\]' % eq) else: g.write('$%s$' % eq) # Finish off the tex file. g.write('\n\\newpage\n\end{document}') g.close() exts = ['.tex', '.aux', '.dvi', '.log'] try: # Generate the DVI file latexcmd = 'latex -file-line-error-style -interaction=nonstopmode ' + \ '-output-directory %s %s' % (tempdir, texfile) p = Popen(latexcmd, shell=True, stdout=PIPE) rc = p.wait() if rc != 0: for l in p.stdout.readlines(): print ' ' + l.rstrip() exts.remove('.tex') raise Exception('latex error') dvifile = basefile + '.dvi' dvicmd = 'dvipng --freetype0 -Q 9 -z 3 --depth -q -T tight -D %i -bg Transparent -o %s %s' % (dpi, eqname, dvifile) # discard warnings, as well. p = Popen(dvicmd, shell=True, stdout=PIPE, stderr=PIPE) rc = p.wait() if rc != 0: print p.stderr.readlines() raise Exception('dvipng error') depth = int(p.stdout.readlines()[-1].split('=')[-1]) finally: # Clean up. for ext in exts: g = basefile + ext if os.path.exists(g): os.remove(g) </code></pre>
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    1. USPeter
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    1. COThanks for the answer. The supplied command line options of dvipng are especially helpful.
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