multiplotwidget.py

   1 ##
   2 ## This file is part of the sigrok-meter project.
   3 ##
   4 ## Copyright (C) 2015 Jens Steinhauser <jens.steinhauser@gmail.com>
   5 ##
   6 ## This program is free software; you can redistribute it and/or modify
   7 ## it under the terms of the GNU General Public License as published by
   8 ## the Free Software Foundation; either version 2 of the License, or
   9 ## (at your option) any later version.
  10 ##
  11 ## This program is distributed in the hope that it will be useful,
  12 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 ## GNU General Public License for more details.
  15 ##
  16 ## You should have received a copy of the GNU General Public License
  17 ## along with this program; if not, write to the Free Software
  18 ## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  19 ##
  20
  21 import qtcompat
  22
  23 QtCore = qtcompat.QtCore
  24 QtGui = qtcompat.QtGui
  25 pyqtgraph = qtcompat.pyqtgraph
  26
  27 # black foreground on white background
  28 pyqtgraph.setConfigOption('background', 'w')
  29 pyqtgraph.setConfigOption('foreground', 'k')
  30
  31 class MultiPlotItem(pyqtgraph.GraphicsWidget):
  32
  33     class Plot:
  34         def __init__(self, view, xaxis, yaxis):
  35             self.view = view
  36             self.xaxis = xaxis
  37             self.yaxis = yaxis
  38
  39     def __init__(self, parent=None):
  40         pyqtgraph.GraphicsWidget.__init__(self, parent)
  41
  42         self.layout = QtGui.QGraphicsGridLayout()
  43         self.layout.setContentsMargins(10, 10, 10, 1)
  44         self.layout.setHorizontalSpacing(0)
  45         self.layout.setVerticalSpacing(0)
  46         self.setLayout(self.layout)
  47
  48         self._plots = []
  49
  50         for i in range(2):
  51             self.layout.setColumnPreferredWidth(i, 0)
  52             self.layout.setColumnMinimumWidth(i, 0)
  53             self.layout.setColumnSpacing(i, 0)
  54
  55         self.layout.setColumnStretchFactor(0, 0)
  56         self.layout.setColumnStretchFactor(1, 100)
  57
  58     def addPlot(self):
  59         row = self.layout.rowCount()
  60
  61         view = pyqtgraph.ViewBox(parent=self)
  62         if self._plots:
  63             view.setXLink(self._plots[-1].view)
  64         self.layout.addItem(view, row, 1)
  65
  66         yaxis = pyqtgraph.AxisItem(parent=self, orientation='left')
  67         yaxis.linkToView(view)
  68         yaxis.setGrid(255)
  69         self.layout.addItem(yaxis, row, 0, QtCore.Qt.AlignRight)
  70
  71         xaxis = pyqtgraph.AxisItem(parent=self, orientation='bottom')
  72         xaxis.linkToView(view)
  73         xaxis.setGrid(255)
  74         self.layout.addItem(xaxis, row + 1, 1)
  75
  76         for i in range(row, row + 2):
  77             self.layout.setRowPreferredHeight(i, 0)
  78             self.layout.setRowMinimumHeight(i, 0)
  79             self.layout.setRowSpacing(i, 0)
  80
  81         self.layout.setRowStretchFactor(row,     100)
  82         self.layout.setRowStretchFactor(row + 1,   0)
  83
  84         p = MultiPlotItem.Plot(view, xaxis, yaxis)
  85         self._plots.append(p)
  86         return p
  87
  88 class MultiPlotWidget(pyqtgraph.GraphicsView):
  89     '''Widget that aligns multiple plots on top of each other.
  90
  91     (The built in classes fail at doing this correctly when the axis grow,
  92     just try zooming in the "GraphicsLayout" or the "Linked View" examples.)'''
  93
  94     def __init__(self, parent=None):
  95         pyqtgraph.GraphicsView.__init__(self, parent)
  96
  97         self.multiPlotItem = MultiPlotItem()
  98         self.setCentralItem(self.multiPlotItem)
  99
 100         for m in [
 101             'addPlot'
 102         ]:
 103             setattr(self, m, getattr(self.multiPlotItem, m))