Center alignment of text in PyX

Question

I am using PyX to create rectangles and putting some (LaTex) text within the rectangle.

# python 3
from pyx import *
text.set(text.LatexRunner)
c = canvas.canvas()
c.stroke(path.rect(0, 0, 1, 1), [style.linewidth.Thick,
                                 color.rgb.red,
                                 deco.filled([color.rgb.green])])

c.text(0.25, 0.25, r"\LaTeX{}")

c.writePDFfile("text-centered") # creates a PDF file     

The above code snippet creates a PDF:

As you can see, the text is not aligned. It is possible to try manually until it is (visibly) centered, but this is problematic for obvious reasons.

My question: Is it possible to align the text centered (both horizontally and vertically) automatically?

Answer 1

just use

c.text(0.5, 0.5, r"\LaTeX{}", [text.halign.center, text.vshift.mathaxis])

see

• http://pyx.sourceforge.net/manual/text.html#text.halign.center
• http://pyx.sourceforge.net/manual/text.html#text.vshift.mathaxis
• http://pyx.sourceforge.net/examples/text/halign.html
• http://pyx.sourceforge.net/examples/text/valign.html

for some documentation and examples