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',
'GEOHEX_{}.qm'.format(locale))
if os.path.exists(locale_path):
self.translator = QTranslator()
self.translator.load(locale_path)
if qVersion() > '4.3.3':
QCoreApplication.installTranslator(self.translator)
# Create the dialog (after translation) and keep reference
self.dlg = GEOHEXDialog()
# Declare instance attributes
self.actions = []
self.menu = self.tr(u'&GEOHEX')
# TODO: We are going to let the user set this up in a future iteration
self.toolbar = self.iface.addToolBar(u'GEOHEX')
self.toolbar.setObjectName(u'GEOHEX')
class GEOHEX:
"""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',
'GEOHEX_{}.qm'.format(locale))
if os.path.exists(locale_path):
self.translator = QTranslator()
self.translator.load(locale_path)
if qVersion() > '4.3.3':
QCoreApplication.installTranslator(self.translator)
# Create the dialog (after translation) and keep reference
self.dlg = GEOHEXDialog()
# Declare instance attributes
self.actions = []
self.menu = self.tr(u'&GEOHEX')
# TODO: We are going to let the user set this up in a future iteration
self.toolbar = self.iface.addToolBar(u'GEOHEX')
self.toolbar.setObjectName(u'GEOHEX')
# 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('GEOHEX', 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 initGui(self):
"""Create the menu entries and toolbar icons inside the QGIS GUI."""
icon_path = ':/plugins/GEOHEX/icon.png'
self.add_action(
icon_path,
text=self.tr(u'GEOHEX'),
callback=self.run,
parent=self.iface.mainWindow())
def unload(self):
"""Removes the plugin menu item and icon from QGIS GUI."""
for action in self.actions:
self.iface.removePluginVectorMenu(
self.tr(u'&GEOHEX'),
action)
self.iface.removeToolBarIcon(action)
# remove the toolbar
del self.toolbar
def run(self):
"""Run method that performs all the real work"""
layers = self.iface.legendInterface().layers()
layer_list = [l.name() for l in layers]
layer_list.append('Current Map Window')
self.dlg.extentLayerList.clear()
self.dlg.extentLayerList.addItems(layer_list)
# show the dialog
self.dlg.show()
# Run the dialog event loop
result = self.dlg.exec_()
# See if OK was pressed
if result:
gh_level = self.dlg.levelLineEdit.text()
selected_layer_idx = self.dlg.extentLayerList.currentIndex()
if selected_layer_idx == len(layer_list) - 1:
w_extent = self.iface.mapCanvas().extent()
w_crs = self.iface.mapCanvas().mapSettings().destinationCrs()
else:
selected_layer = layers[selected_layer_idx]
w_extent = selected_layer.extent()
w_crs = selected_layer.crs()
w_srid = w_crs.authid()
wgs84 = qgis.core.QgsCoordinateReferenceSystem(4326)
transform = qgis.core.QgsCoordinateTransform(w_crs, wgs84)
gh_extent = transform.transformBoundingBox(w_extent)
out_transform = qgis.core.QgsCoordinateTransform(wgs84, w_crs)
zones = geohex.create_zones_by_extent(int(gh_level),
gh_extent.xMinimum(),
gh_extent.yMinimum(),
gh_extent.xMaximum(),
gh_extent.yMaximum())
#create event layer
gh_layer = qgis.core.QgsVectorLayer('Polygon?crs={srid}&field=code:string(50)'.format(srid=w_srid), 'geohex_lev'+gh_level, 'memory')
hg_dp = gh_layer.dataProvider()
for zone in zones:
f = qgis.core.QgsFeature(gh_layer.pendingFields())
f.setAttribute('code', zone.code)
geom = qgis.core.QgsGeometry.fromWkt(zone.get_wkt_deg())
geom.transform(out_transform)
f.setGeometry(geom)
hg_dp.addFeatures([f])
gh_layer.updateExtents()
qgis.core.QgsMapLayerRegistry.instance().addMapLayer(gh_layer)