design/dtk/valign.py

   1 from pyx import *
   2
   3 text.set(mode="latex")
   4 text.preamble(r"\usepackage{exscale}")
   5
   6 spameggswidth = 2.7
   7 arrowdist = 0.1
   8 arrowlen = 0.2
   9 textdist = 0.1
  10
  11 c = canvas.canvas()
  12
  13
  14 def label(x, y, width, t): # x == -1 -> left; x == 1 -> right
  15     c.stroke(path.line(width*(0.5*x+0.5) + x*arrowdist, y,
  16                        width*(0.5*x+0.5) + x*(arrowdist + arrowlen), y),
  17              [deco.barrow.Small])
  18     c.text(width*(0.5*x+0.5) + x*(arrowdist + arrowlen + textdist), y,
  19            t, [text.vshift.mathaxis, text.boxhalign(0.5-0.5*x)])
  20
  21
  22 t = c.text(0, 0, r"\noindent spam \& eggs", [text.parbox(2.7), text.size.Huge])
  23 t2 = text.text(0, 0, "eggs", [text.size.Huge])
  24
  25 c.stroke(t.bbox().path(), [style.linewidth.THin])
  26 c.stroke(path.line(0, 0, 2.7, 0) +
  27          path.line(0, t2.depth-t.depth, 2.7, t2.depth-t.depth),
  28          [style.linestyle.dashed, style.linewidth.THin])
  29
  30 label(-1, t.height, spameggswidth, "valign.top")
  31 label(-1, 0.5*(t.height-t.depth), spameggswidth, "valign.middle")
  32 label(-1, -t.depth, spameggswidth, "valign.bottom")
  33 label(1, 0, spameggswidth, "parbox.top")
  34 label(1, 0.5*(t2.depth-t.depth), spameggswidth, "parbox.middle")
  35 label(1, t2.depth-t.depth, spameggswidth, "parbox.bottom")
  36
  37 mathypos = -2.5
  38 mathstr = r"\sum_{i=0}^{\infty}\frac{1}{i^2}=\frac{1}{6}\pi^2"
  39
  40 t = c.text(0, mathypos, mathstr, [text.mathmode, text.vshift.mathaxis, text.size.LARGE])
  41 t2 = text.text(0, mathypos, mathstr, [text.mathmode, text.size.LARGE])
  42
  43 c.stroke(t.bbox().path(), [style.linewidth.THin])
  44 c.stroke(path.line(0, mathypos, t.width, mathypos)+
  45          path.line(0, mathypos+t.height-t2.height, t.width, mathypos+t.height-t2.height),
  46          [style.linestyle.dashed, style.linewidth.THin])
  47
  48 label(-1, mathypos, t.width, "vshift.mathaxis")
  49 label(1, mathypos+t.height-t2.height, t.width, "baseline")
  50
  51 c.writeEPSfile("valign")