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linedirectionhistogram.py
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linedirectionhistogram.py
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# -*- coding: utf-8 -*-
"""
/***************************************************************************
linedirectionhistogram
A QGIS plugin
Create a line direction histogram
-------------------
begin : 2015-04-10
git sha : $Format:%H$
copyright : (C) 2015 by Håvard Tveite, NMBU
email : havard.tveite@nmbu.no
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
"""
import os.path
from qgis.core import QgsProject, QgsMapLayer, QgsWkbTypes
from qgis.PyQt.QtCore import QSettings, QCoreApplication
from qgis.PyQt.QtCore import QTranslator, qVersion
from qgis.PyQt.QtGui import QIcon
from qgis.PyQt.QtWidgets import QAction, QMessageBox
# Initialize Qt resources from file resources.py
from .resources import *
# Import the code for the dialog
from .linedirectionhistogram_dialog import linedirectionhistogramDialog
# The following user interface components are referenced (in run()):
# "InputLayer", "progressBar"
class linedirectionhistogram:
"""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 a reference to the QGIS interface
self.iface = iface
# initialize the plugin directory
pluginPath = os.path.dirname(__file__)
# initialize the locale using the QGIS locale
locale = QSettings().value('locale/userLocale')[0:2]
locale_path = os.path.join(
pluginPath,
'i18n',
'{}.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 the reference
self.dlg = linedirectionhistogramDialog(self.iface)
# Declare instance attributes
self.menuname = self.tr(u'&Line Direction Histogram')
# 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('LineDirectionHistogram', message)
def initGui(self):
"""Create the menu entries and toolbar icons inside the QGIS GUI."""
icon_path = os.path.join(os.path.dirname(__file__), "icon.png")
# Create an action that will start the plugin configuration
self.action = QAction(
QIcon(icon_path),
self.menuname, self.iface.mainWindow())
# connect the action to the run method
self.action.triggered.connect(self.run)
# Add toolbar icon
if hasattr(self.iface, 'addVectorToolBarIcon'):
self.iface.addVectorToolBarIcon(self.action)
else:
self.iface.addToolBarIcon(self.action)
# Add menu item
if hasattr(self.iface, 'addPluginToVectorMenu'):
self.iface.addPluginToVectorMenu(self.menuname, self.action)
else:
self.iface.addPluginToMenu(self.menuname, self.action)
def unload(self):
"""Removes the plugin menu item and icon from QGIS GUI."""
# Remove the plugin menu item
if hasattr(self.iface, 'removePluginVectorMenu'):
self.iface.removePluginVectorMenu(self.menuname, self.action)
else:
self.iface.removePluginMenu(self.menuname, self.action)
# Remove the plugin toolbar icon
if hasattr(self.iface, 'removeVectorToolBarIcon'):
self.iface.removeVectorToolBarIcon(self.action)
else:
self.iface.removeToolBarIcon(self.action)
def run(self):
"""Run method that performs all the real work"""
# Do some initialisations
# The progressbar
self.dlg.progressBar.setValue(0.0)
# Prepare for sorting
layers = QgsProject.instance().mapLayers()
layerslist = []
for id in layers.keys():
if layers[id].type() == QgsMapLayer.VectorLayer:
if not layers[id].isValid():
QMessageBox.information(None,
self.tr('Information'),
'Layer ' + layers[id].name() + ' is not valid')
else:
layerslist.append((layers[id].name(), id))
# Sort the layers by name
layerslist.sort(key=lambda x: x[0], reverse=False)
# Add the layers to the input layer combobox
self.dlg.InputLayer.clear()
for layerdescription in layerslist:
if (layers[layerdescription[1]].geometryType() ==
QgsWkbTypes.LineGeometry or
layers[layerdescription[1]].geometryType() ==
QgsWkbTypes.PolygonGeometry):
self.dlg.InputLayer.addItem(layerdescription[0],
layerdescription[1])
# Add the layers to the tiling layer combobox
self.dlg.TilingLayer.clear()
for layerdescription in layerslist:
if (layers[layerdescription[1]].geometryType() ==
QgsWkbTypes.PolygonGeometry):
self.dlg.TilingLayer.addItem(layerdescription[0],
layerdescription[1])
# show the dialog
self.dlg.show()