2 ## This file is part of the sigrok-meter project.
4 ## Copyright (C) 2014 Jens Steinhauser <jens.steinhauser@gmail.com>
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.
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.
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
24 import sigrok.core as sr
29 from itertools import izip
33 QtCore = qtcompat.QtCore
34 QtGui = qtcompat.QtGui
36 class MeasurementDataModel(QtGui.QStandardItemModel):
37 '''Model to hold the measured values.'''
39 '''Role used to identify and find the item.'''
40 idRole = QtCore.Qt.UserRole + 1
42 '''Role used to store the device vendor and model.'''
43 descRole = QtCore.Qt.UserRole + 2
45 '''Role used to store past samples.'''
46 samplesRole = QtCore.Qt.UserRole + 3
48 '''Role used to store the color to draw the graph of the channel.'''
49 colorRole = QtCore.Qt.UserRole + 4
51 def __init__(self, parent):
52 super(self.__class__, self).__init__(parent)
54 # Use the description text to sort the items for now, because the
55 # idRole holds tuples, and using them to sort doesn't work.
56 self.setSortRole(MeasurementDataModel.descRole)
58 # Used in 'format_value()' to check against.
59 self.inf = float('inf')
61 # A generator for the colors of the channels.
62 self._colorgen = self._make_colorgen()
64 def _make_colorgen(self):
66 QtGui.QColor(0x8F, 0x52, 0x02), # brown
67 QtGui.QColor(0xCC, 0x00, 0x00), # red
68 QtGui.QColor(0xF5, 0x79, 0x00), # orange
69 QtGui.QColor(0xED, 0xD4, 0x00), # yellow
70 QtGui.QColor(0x73, 0xD2, 0x16), # green
71 QtGui.QColor(0x34, 0x65, 0xA4), # blue
72 QtGui.QColor(0x75, 0x50, 0x7B) # violet
76 '''Repeats every element from 'g' 'n' times'.'''
78 for f in itertools.repeat(e, n):
81 colorcycle = itertools.cycle(cols)
82 darkness = myrepeat(itertools.count(100, 10), len(cols))
84 for c, d in izip(colorcycle, darkness):
85 yield QtGui.QColor(c).darker(d)
87 def format_mqflags(self, mqflags):
88 if sr.QuantityFlag.AC in mqflags:
90 elif sr.QuantityFlag.DC in mqflags:
95 def format_value(self, mag):
98 return '{:f}'.format(mag)
100 def getItem(self, device, channel):
101 '''Return the item for the device + channel combination from the
102 model, or create a new item if no existing one matches.'''
104 # Unique identifier for the device + channel.
105 # TODO: Isn't there something better?
109 device.serial_number(),
110 device.connection_id(),
114 # Find the correct item in the model.
115 for row in range(self.rowCount()):
116 item = self.item(row)
117 rid = item.data(MeasurementDataModel.idRole)
118 rid = tuple(rid) # PySide returns a list.
122 # Nothing found, create a new item.
123 desc = '{} {}, {}'.format(
124 device.vendor, device.model, channel.name)
126 item = QtGui.QStandardItem()
127 item.setData(uid, MeasurementDataModel.idRole)
128 item.setData(desc, MeasurementDataModel.descRole)
129 item.setData(collections.defaultdict(list), MeasurementDataModel.samplesRole)
130 item.setData(next(self._colorgen), MeasurementDataModel.colorRole)
135 @QtCore.Slot(object, object, object)
136 def update(self, device, channel, data):
137 '''Update the data for the device (+channel) with the most recent
138 measurement from the given payload.'''
140 item = self.getItem(device, channel)
142 value, unit, mqflags = data
143 value_str = self.format_value(value)
144 unit_str = util.format_unit(unit)
145 mqflags_str = self.format_mqflags(mqflags)
147 # The display role is a tuple containing the value and the unit/flags.
148 disp = (value_str, ' '.join([unit_str, mqflags_str]))
149 item.setData(disp, QtCore.Qt.DisplayRole)
151 # The samples role is a dictionary that contains the old samples for each unit.
152 # Should be trimmed periodically, otherwise it grows larger and larger.
153 sample = (time.time(), value)
154 d = item.data(MeasurementDataModel.samplesRole)
155 d[unit].append(sample)
157 class MultimeterDelegate(QtGui.QStyledItemDelegate):
158 '''Delegate to show the data items from a MeasurementDataModel.'''
160 def __init__(self, parent, font):
161 '''Initialize the delegate.
163 :param font: Font used for the description text, the value is drawn
164 with a slightly bigger and bold variant of the font.
167 super(self.__class__, self).__init__(parent)
170 self._bfont = QtGui.QFont(self._nfont)
172 self._bfont.setBold(True)
173 if self._bfont.pixelSize() != -1:
174 self._bfont.setPixelSize(self._bfont.pixelSize() * 1.2)
176 self._bfont.setPointSizeF(self._bfont.pointSizeF() * 1.2)
178 fi = QtGui.QFontInfo(self._nfont)
179 self._nfontheight = fi.pixelSize()
181 fm = QtGui.QFontMetrics(self._bfont)
182 r = fm.boundingRect('-XX.XXXXXX X XX')
183 self._size = QtCore.QSize(r.width() * 1.4, r.height() * 2.2)
185 # Values used to calculate the positions of the strings in the
186 # 'paint()' function.
187 self._space_width = fm.boundingRect('_').width()
188 self._value_width = fm.boundingRect('-XX.XXXXXX').width()
190 def sizeHint(self, option=None, index=None):
193 def paint(self, painter, options, index):
194 value, unit = index.data(QtCore.Qt.DisplayRole)
195 desc = index.data(MeasurementDataModel.descRole)
197 painter.setFont(self._nfont)
198 p = options.rect.topLeft()
199 p += QtCore.QPoint(self._nfontheight, 2 * self._nfontheight)
200 painter.drawText(p, desc + ': ' + value + ' ' + unit)