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
28 from itertools import izip
32 QtCore = qtcompat.QtCore
33 QtGui = qtcompat.QtGui
36 '''Class to hold the measured samples.'''
42 def append(self, sample):
43 self.samples.append(sample)
46 class MeasurementDataModel(QtGui.QStandardItemModel):
47 '''Model to hold the measured values.'''
49 '''Role used to identify and find the item.'''
50 idRole = QtCore.Qt.UserRole + 1
52 '''Role used to store the device vendor and model.'''
53 descRole = QtCore.Qt.UserRole + 2
55 '''Role used to store a dictionary with the traces'''
56 tracesRole = QtCore.Qt.UserRole + 3
58 '''Role used to store the color to draw the graph of the channel.'''
59 colorRole = QtCore.Qt.UserRole + 4
61 def __init__(self, parent):
62 super(self.__class__, self).__init__(parent)
64 # Use the description text to sort the items for now, because the
65 # idRole holds tuples, and using them to sort doesn't work.
66 self.setSortRole(MeasurementDataModel.descRole)
68 # A generator for the colors of the channels.
69 self._colorgen = self._make_colorgen()
71 def _make_colorgen(self):
73 QtGui.QColor(0x8F, 0x52, 0x02), # brown
74 QtGui.QColor(0x73, 0xD2, 0x16), # green
75 QtGui.QColor(0xCC, 0x00, 0x00), # red
76 QtGui.QColor(0x34, 0x65, 0xA4), # blue
77 QtGui.QColor(0xF5, 0x79, 0x00), # orange
78 QtGui.QColor(0xED, 0xD4, 0x00), # yellow
79 QtGui.QColor(0x75, 0x50, 0x7B) # violet
83 '''Repeats every element from 'g' 'n' times'.'''
85 for f in itertools.repeat(e, n):
88 colorcycle = itertools.cycle(cols)
89 darkness = myrepeat(itertools.count(100, 10), len(cols))
91 for c, d in izip(colorcycle, darkness):
92 yield QtGui.QColor(c).darker(d)
94 def format_mqflags(self, mqflags):
95 if sr.QuantityFlag.AC in mqflags:
97 elif sr.QuantityFlag.DC in mqflags:
102 def format_value(self, mag):
105 return '{:f}'.format(mag)
107 def getItem(self, device, channel):
108 '''Return the item for the device + channel combination from the
109 model, or create a new item if no existing one matches.'''
111 # Unique identifier for the device + channel.
112 # TODO: Isn't there something better?
116 device.serial_number(),
117 device.connection_id(),
121 # Find the correct item in the model.
122 for row in range(self.rowCount()):
123 item = self.item(row)
124 rid = item.data(MeasurementDataModel.idRole)
125 rid = tuple(rid) # PySide returns a list.
129 # Nothing found, create a new item.
130 desc = '{} {}, {}'.format(
131 device.vendor, device.model, channel.name)
133 item = QtGui.QStandardItem()
134 item.setData(uid, MeasurementDataModel.idRole)
135 item.setData(desc, MeasurementDataModel.descRole)
136 item.setData({}, MeasurementDataModel.tracesRole)
137 item.setData(next(self._colorgen), MeasurementDataModel.colorRole)
142 @QtCore.Slot(float, sr.classes.Device, sr.classes.Channel, tuple)
143 def update(self, timestamp, device, channel, data):
144 '''Update the data for the device (+channel) with the most recent
145 measurement from the given payload.'''
147 item = self.getItem(device, channel)
149 value, unit, mqflags = data
150 value_str = self.format_value(value)
151 unit_str = util.format_unit(unit)
152 mqflags_str = self.format_mqflags(mqflags)
154 # The display role is a tuple containing the value and the unit/flags.
155 disp = (value_str, ' '.join([unit_str, mqflags_str]))
156 item.setData(disp, QtCore.Qt.DisplayRole)
158 # The samples role is a dictionary that contains the old samples for each unit.
159 # Should be trimmed periodically, otherwise it grows larger and larger.
160 if not math.isinf(value) and not math.isnan(value):
161 sample = (timestamp, value)
162 traces = item.data(MeasurementDataModel.tracesRole)
164 # It's not possible to use 'collections.defaultdict' here, because
165 # PySide doesn't return the original type that was passed in.
166 if not (unit in traces):
167 traces[unit] = Trace()
168 traces[unit].append(sample)
170 item.setData(traces, MeasurementDataModel.tracesRole)
172 class MultimeterDelegate(QtGui.QStyledItemDelegate):
173 '''Delegate to show the data items from a MeasurementDataModel.'''
175 def __init__(self, parent, font):
176 '''Initialize the delegate.
178 :param font: Font used for the text.
181 super(self.__class__, self).__init__(parent)
185 fi = QtGui.QFontInfo(self._nfont)
186 self._nfontheight = fi.pixelSize()
188 fm = QtGui.QFontMetrics(self._nfont)
189 r = fm.boundingRect('-XX.XXXXXX X XX')
191 w = 1.4 * r.width() + 2 * self._nfontheight
192 h = 2.6 * self._nfontheight
193 self._size = QtCore.QSize(w, h)
195 def sizeHint(self, option=None, index=None):
198 def _color_rect(self, outer):
199 '''Returns the dimensions of the clickable rectangle.'''
200 x1 = (outer.height() - self._nfontheight) / 2
201 r = QtCore.QRect(x1, x1, self._nfontheight, self._nfontheight)
202 r.translate(outer.topLeft())
205 def paint(self, painter, options, index):
206 value, unit = index.data(QtCore.Qt.DisplayRole)
207 desc = index.data(MeasurementDataModel.descRole)
208 color = index.data(MeasurementDataModel.colorRole)
210 painter.setFont(self._nfont)
212 # Draw the clickable rectangle.
213 painter.fillRect(self._color_rect(options.rect), color)
216 h = options.rect.height()
217 p = options.rect.topLeft()
218 p += QtCore.QPoint(h, (h + self._nfontheight) / 2 - 2)
219 painter.drawText(p, desc + ': ' + value + ' ' + unit)
221 def editorEvent(self, event, model, options, index):
222 if type(event) is QtGui.QMouseEvent:
223 if event.type() == QtCore.QEvent.MouseButtonPress:
224 rect = self._color_rect(options.rect)
225 if rect.contains(event.x(), event.y()):
226 c = index.data(MeasurementDataModel.colorRole)
227 c = QtGui.QColorDialog.getColor(c, None,
228 'Choose new color for channel')
230 # False if cancel is pressed (resulting in a black
232 item = model.itemFromIndex(index)
233 item.setData(c, MeasurementDataModel.colorRole)