def altplot(self, dataset, graphicsview):
w = graphicsview.width()
h = graphicsview.height()
air = 39
#bt=airborne
plotw = w - air * 2
ploth = h - air * 2
scene = QGraphicsScene()
graphicsview.setScene(scene)
xspan = [min(dataset[0]), max(dataset[0])]
yspan = [min(dataset[1]), max(dataset[1])]
xfact = (xspan[1] - xspan[0]) / plotw
yfact = (yspan[1] - yspan[0]) / ploth
rad = 2
xaxy = float(ploth + rad * 2)
yaxx = float(air - 1)
scene.addLine(yaxx, xaxy, yaxx, air / 2) # Y-axis
scene.addLine(yaxx, xaxy, float(w - air / 2), xaxy) # X-axis
for alt, meas in zip(dataset[0], dataset[1]):
x = (alt - xspan[0]) / xfact + air
y = ploth - (meas - yspan[0]) / yfact
scene.addEllipse(x, y, rad * 2, rad * 2)
class StripChart:
"""QGIS Plugin Implementation."""
def __init__(self, iface):
"""Constructor.
:param iface: An interface instance that will be passed to this class
which provides the hook by which you can manipulate the QGIS
application at run time.
:type iface: QgsInterface
"""
# Save reference to the QGIS interface
self.iface = iface
# initialize plugin directory
self.plugin_dir = os.path.dirname(__file__)
# initialize locale
locale = QSettings().value('locale/userLocale')[0:2]
locale_path = os.path.join(self.plugin_dir, 'i18n',
'StripChart_{}.qm'.format(locale))
if os.path.exists(locale_path):
self.translator = QTranslator()
self.translator.load(locale_path)
QCoreApplication.installTranslator(self.translator)
# Declare instance attributes
self.actions = []
self.menu = self.tr(u'Spectral data')
self.toolbar = self.iface.addToolBar(u'Stripchart')
self.toolbar.setObjectName(u'Stripchart')
#QgsMessageLog.logMessage(message, tag, level)("** INITIALIZING StripChart")
self.view = MouseReadGraphicsView(self.iface)
self.view.layer = None
self.pluginIsActive = False
self.view.parent = self
# self.dockwidget = None
# noinspection PyMethodMayBeStatic
def tr(self, message):
"""Get the translation for a string using Qt translation API.
We implement this ourselves since we do not inherit QObject.
:param message: String for translation.
:type message: str, QString
:returns: Translated version of message.
:rtype: QString
"""
# noinspection PyTypeChecker,PyArgumentList,PyCallByClass
return QCoreApplication.translate('Stripchart', message)
def add_action(self,
icon_path,
text,
callback,
enabled_flag=True,
add_to_menu=True,
add_to_toolbar=True,
status_tip=None,
whats_this=None,
parent=None):
"""Add a toolbar icon to the toolbar.
:param icon_path: Path to the icon for this action. Can be a resource
path (e.g. ':/plugins/foo/bar.png') or a normal file system path.
:type icon_path: str
:param text: Text that should be shown in menu items for this action.
:type text: str
:param callback: Function to be called when the action is triggered.
:type callback: function
:param enabled_flag: A flag indicating if the action should be enabled
by default. Defaults to True.
:type enabled_flag: bool
:param add_to_menu: Flag indicating whether the action should also
be added to the menu. Defaults to True.
:type add_to_menu: bool
:param add_to_toolbar: Flag indicating whether the action should also
be added to the toolbar. Defaults to True.
:type add_to_toolbar: bool
:param status_tip: Optional text to show in a popup when mouse pointer
hovers over the action.
:type status_tip: str
:param parent: Parent widget for the new action. Defaults None.
:type parent: QWidget
:param whats_this: Optional text to show in the status bar when the
mouse pointer hovers over the action.
:returns: The action that was created. Note that the action is also
added to self.actions list.
:rtype: QAction
"""
icon = QIcon(icon_path)
action = QAction(icon, text, parent)
action.triggered.connect(callback)
action.setEnabled(enabled_flag)
if status_tip is not None:
action.setStatusTip(status_tip)
if whats_this is not None:
action.setWhatsThis(whats_this)
if add_to_toolbar:
self.toolbar.addAction(action)
if add_to_menu:
self.iface.addPluginToVectorMenu(self.menu, action)
self.actions.append(action)
return action
def selectedlayer(self):
if self.dlg.qgLayer.currentLayer() == None:
return
self.dlg.qgField.setLayer(self.dlg.qgLayer.currentLayer())
self.dlg.qgField.setField(None)
self.clearscene()
def initGui(self):
"""Create the menu entries and toolbar icons inside the QGIS GUI."""
icon_path = ':/plugins/stripchart/icon.png'
self.add_action(icon_path,
text=self.tr(u'Stripchart'),
callback=self.run,
parent=self.iface.mainWindow())
self.dlg = StripChartDockWidget(self.iface.mainWindow())
self.view.setParent(self.dlg)
self.dlg.vlMain.addWidget(self.view)
self.scene = QGraphicsScene()
self.view.setScene(self.scene)
self.scene.setSceneRect(0, 0, 300, 2000)
self.dlg.qgLayer.setFilters(QgsMapLayerProxyModel.VectorLayer)
self.dlg.qgLayer.setLayer(self.iface.activeLayer())
self.dlg.qgField.setAllowEmptyFieldName(True)
self.dlg.qgField.setLayer(self.dlg.qgLayer.currentLayer())
self.dlg.qgField.setFilters(QgsFieldProxyModel.Numeric)
self.dlg.qgLayer.layerChanged.connect(self.selectedlayer)
self.iface.mapCanvas().selectionChanged.connect(self.markselected)
self.dlg.qgField.currentIndexChanged['QString'].connect(
self.stripchart)
#--------------------------------------------------------------------------
def onClosePlugin(self):
"""Cleanup necessary items here when plugin dockwidget is closed"""
# disconnects
self.dlg.closingPlugin.disconnect(self.onClosePlugin)
self.pluginIsActive = False
def unload(self):
"""Removes the plugin menu item and icon from QGIS GUI."""
#print "** UNLOAD StripChart"
for action in self.actions:
self.iface.removePluginVectorMenu(self.tr(u'Spectral data'),
action)
self.iface.removeToolBarIcon(action)
# remove the toolbar
del self.toolbar
#--------------------------------------------------------------------------
def clearscene(self):
self.scene.clear()
self.view.selectlines = []
self.scene.values = []
self.view.ids = [] # Keeps the ids .
def stripchart(self):
"""
Draws a stripchart based on a dataset
"""
self.view.layer = self.dlg.qgLayer.currentLayer()
if self.view.layer == None or self.dlg.isHidden():
return
if self.view.layer.featureCount() == 0:
self.iface.messageBar().pushMessage(
"Stripchart",
"No data in table, cannot draw stripchart",
level=Qgis.Critical,
duration=3) # Info, Warning, Critical, Success
return
QgsMessageLog.logMessage("Stripchart starting", "Messages", 0)
self.clearscene()
idfields = self.view.layer.dataProvider().pkAttributeIndexes(
) # These are the fields that build up the primary key
if len(idfields) == 0:
try:
self.view.idfield = self.view.layer.fields()[0].name()
self.iface.messageBar().pushMessage(
"Warning",
"No primary key for {}, sorting on {}, - selection may not be possible"
.format(self.view.layer.name(), self.view.idfield),
level=Qgis.Warning) # Info, Warning, Critical, Success
except IndexError as e:
# Probably undefined layer, just return
# This happens some times when exiting QGIS
QgsMessageLog.logMessage(
"Could not draw stripchart - IndexError", "Messages",
Qgis.Warning)
return
else:
#idfield=idfields[0]
self.view.idfield = self.view.layer.fields()[idfields[0]].name()
self.iface.messageBar().pushMessage(
"Info",
"Sorting on {}".format(self.view.idfield),
level=Qgis.Info,
duration=3) # Info, Warning, Critical, Success
fieldname = self.dlg.qgField.currentText()
if fieldname == '' or fieldname is None:
return
request = QgsFeatureRequest().addOrderBy(self.view.idfield).setFlags(
QgsFeatureRequest.NoGeometry).setSubsetOfAttributes(
[self.view.idfield, fieldname], self.view.layer.fields())
iter = self.view.layer.getFeatures(request)
for feature in iter:
if isinstance(feature[fieldname], list):
self.iface.messageBar().pushMessage(
"Error",
"Invalid field type : {}".format(fieldname),
level=Qgis.Warning,
duration=3) # Info, Warning, Critical, Success
return
self.scene.values.append(feature[fieldname])
self.view.ids.append(feature[self.view.idfield])
# QgsMessageLog.logMessage("Added id {}".format(feature[self.view.idfield]), "Messages", Qgis.Info)
self.scene.setSceneRect(0, 0, self.view.width, len(self.scene.values))
airfact = 0.02
maxval = max(self.scene.values)
minval = min(self.scene.values)
print(maxval, minval)
if maxval == None:
# Field with only "None" values
return
air = (maxval - minval) * airfact
if maxval > 0:
maxval += air
else:
maxval -= air
if minval > 0:
minval -= air
else:
minval += air
if maxval - minval == 0:
scale = self.view.width / maxval # Could just as well return since this will plot a straight line...
else:
scale = self.view.width / (maxval - minval)
n = 0
for v in self.scene.values:
v -= minval
self.scene.addLine(0, n, v * scale, n)
n += 1
self.markselected(
) # In case something is already selected when the layer is plotted
def run(self):
"""Run method that loads and starts the plugin"""
self.init = True
if not self.pluginIsActive:
self.pluginIsActive = True
# connect to provide cleanup on closing of dockwidget
self.dlg.closingPlugin.connect(self.onClosePlugin)
# show the dockwidget
self.iface.mainWindow().addDockWidget(Qt.RightDockWidgetArea,
self.dlg)
self.dlg.show()
def markselected(self):
"""Marks in the stripchart which elements that are selected"""
try:
if self.view.layer == None:
return
QgsMessageLog.logMessage("Going to look into selection",
"Messages", Qgis.Info)
sels = self.view.layer.selectedFeatures(
) # The selected features in the active (from this plugin's point of view) layer
n = len(sels)
QgsMessageLog.logMessage("Selected {}".format(n), "Messages",
Qgis.Info)
self.view.clearselection()
QgsMessageLog.logMessage("Selection cleared", "Messages",
Qgis.Info)
if n > 0:
self.view.markselection(sels)
except:
try:
self.iface.messageBar().pushMessage(
"Stripchart",
"Error during selection from {}".format(
self.view.layer.name()),
level=Qgis.Warning,
duration=3) # Info, Warning, Critical, Success
except RuntimeError:
print("Error in markselected:")
print(e)
except Exception as e:
self.iface.messageBar().pushMessage(
"Stripchart",
"Error during selection ",
level=Qgis.Warning,
duration=3) # Info, Warning, Critical, Success
print(e)
print(self.view.layer.name())