pyx/graph/key.py

   1 # -*- coding: ISO-8859-1 -*-
   2 #
   3 #
   4 # Copyright (C) 2002-2004 Jörg Lehmann <joergl@users.sourceforge.net>
   5 # Copyright (C) 2003-2004 Michael Schindler <m-schindler@users.sourceforge.net>
   6 # Copyright (C) 2002-2005 André Wobst <wobsta@users.sourceforge.net>
   7 #
   8 # This file is part of PyX (http://pyx.sourceforge.net/).
   9 #
  10 # PyX is free software; you can redistribute it and/or modify
  11 # it under the terms of the GNU General Public License as published by
  12 # the Free Software Foundation; either version 2 of the License, or
  13 # (at your option) any later version.
  14 #
  15 # PyX is distributed in the hope that it will be useful,
  16 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 # GNU General Public License for more details.
  19 #
  20 # You should have received a copy of the GNU General Public License
  21 # along with PyX; if not, write to the Free Software
  22 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
  23
  24
  25 from pyx import box, canvas, text, trafo, unit
  26
  27
  28 class key:
  29
  30     defaulttextattrs = [text.vshift.mathaxis]
  31
  32     def __init__(self, dist=0.2*unit.v_cm, pos="tr", hpos=None, vpos=None,
  33                  hinside=1, vinside=1, hdist=0.6*unit.v_cm, vdist=0.4*unit.v_cm,
  34                  symbolwidth=0.5*unit.v_cm, symbolheight=0.25*unit.v_cm, symbolspace=0.2*unit.v_cm,
  35                  textattrs=[], columns=1, columndist=0.5*unit.v_cm,
  36                  border=0.3*unit.v_cm, keyattrs=None):
  37         self.dist = dist
  38         self.hinside = hinside
  39         self.vinside = vinside
  40         self.hdist = hdist
  41         self.vdist = vdist
  42         self.symbolwidth = symbolwidth
  43         self.symbolheight = symbolheight
  44         self.symbolspace = symbolspace
  45         self.textattrs = textattrs
  46         self.columns = columns
  47         self.columndist = columndist
  48         self.border = border
  49         self.keyattrs = keyattrs
  50         if pos is not None:
  51             if vpos is not None or hpos is not None:
  52                 raise ValueError("either specify pos or a combination of hpos, vpos")
  53             for poslist, hpos, vpos in [(["tr", "rt"], 1, 1),
  54                                         (["tc", "ct"], 0.5, 1),
  55                                         (["tl", "lt"], 0, 1),
  56                                         (["mr", "rm"], 1, 0.5),
  57                                         (["mc", "cm"], 0.5, 0.5),
  58                                         (["ml", "lm"], 0, 0.5),
  59                                         (["br", "rb"], 1, 0),
  60                                         (["bc", "cb"], 0.5, 0),
  61                                         (["bl", "lb"], 0, 0)]:
  62                 if pos in poslist:
  63                     self.hpos = hpos
  64                     self.vpos = vpos
  65                     break
  66             else:
  67                 raise ValueError("invalid pos")
  68         else:
  69             if vpos is None or hpos is None:
  70                 raise ValueError("either specify pos or a combination of hpos, vpos")
  71             self.hpos = hpos
  72             self.vpos = vpos
  73
  74     def paintcolumn(self, plotitems):
  75         "creates the layout of a key column"
  76         c = canvas.canvas()
  77         self.dist_pt = unit.topt(self.dist)
  78         self.hdist_pt = unit.topt(self.hdist)
  79         self.vdist_pt = unit.topt(self.vdist)
  80         self.symbolwidth_pt = unit.topt(self.symbolwidth)
  81         self.symbolheight_pt = unit.topt(self.symbolheight)
  82         self.symbolspace_pt = unit.topt(self.symbolspace)
  83         titleboxes = []
  84         for plotitem in plotitems:
  85             titlebox = c.texrunner.text_pt(0, 0, plotitem.title, self.defaulttextattrs + self.textattrs)
  86             titlebox.plotitem = plotitem
  87             titleboxes.append(titlebox)
  88         dy_pt = box.tile_pt(titleboxes, self.dist_pt, 0, -1)
  89         box.linealignequal_pt(titleboxes, self.symbolwidth_pt + self.symbolspace_pt, 1, 0)
  90         y_pt = -0.5 * self.symbolheight_pt + titleboxes[0].center[1]
  91         for titlebox in titleboxes:
  92             titlebox.plotitem.key_pt(c, 0, y_pt, self.symbolwidth_pt, self.symbolheight_pt)
  93             y_pt -= dy_pt
  94         for titlebox in titleboxes:
  95             c.insert(titlebox)
  96         return c
  97
  98     def paint(self, plotitems):
  99         "creates the layout of the key"
 100         columndist_pt = unit.topt(self.columndist)
 101         c = canvas.canvas()
 102         plotitems = [plotitem for plotitem in plotitems if plotitem.title is not None]
 103         itemspercolumn = (len(plotitems) + self.columns - 1) / self.columns # integer division
 104         x_pt = 0
 105         while plotitems:
 106             subc = self.paintcolumn(plotitems[:itemspercolumn])
 107             c.insert(subc, [trafo.translate_pt(x_pt, 0)])
 108             x_pt += unit.topt(subc.bbox().width()) + columndist_pt
 109             del plotitems[:itemspercolumn]
 110         if self.keyattrs is not None:
 111             newc = canvas.canvas()
 112             newc.draw(c.bbox().enlarged(self.border).path(), self.keyattrs)
 113             newc.insert(c)
 114             c = newc
 115         return c