gallery/misc/connect.py

   1 from pyx import *
   2 from pyx.connector import arc, curve
   3
   4 unit.set(uscale=3)
   5
   6 c = canvas.canvas()
   7
   8 textattrs = [text.halign.center, text.vshift.middlezero]
   9 A = text.text(0, 0, r"\bf A", textattrs)
  10 B = text.text(1, 0, r"\bf B", textattrs)
  11 C = text.text(1, 1, r"\bf C", textattrs)
  12 D = text.text(0, 1, r"\bf D", textattrs)
  13
  14 for X in [A, B, C, D]:
  15     c.draw(X.bbox().enlarged(0.1).path(),
  16         [deco.stroked(), deco.filled([color.grey(0.85)])])
  17     c.insert(X)
  18
  19 for X,Y in [[A, B], [B, C], [C, D], [D, A]]:
  20     c.stroke(arc(X, Y, boxdists=[0.2, 0.2], relangle=-45), [color.rgb.red, deco.earrow.normal])
  21
  22 c.stroke(curve(D, B, boxdists=[0.2, 0.2], relangle1=-45, relangle2=-45, relbulge=0.8),
  23          [color.rgb.blue, deco.earrow.normal])
  24
  25 c.writeEPSfile("connect")
  26 c.writePDFfile("connect")