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geobricks_qgis_plugin_world_bank.py
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geobricks_qgis_plugin_world_bank.py
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# -*- coding: utf-8 -*-
"""
/***************************************************************************
GeobricksQgisPluginWorldBank
A QGIS plugin
Plugin for Qgis 2.x. Creates thematic maps with World Bank data.
-------------------
begin : 2015-10-08
git sha : $Format:%H$
copyright : (C) 2015 by Simone Murzilli/GeoBricks
email : simone.murzilli@gmail.com
***************************************************************************/
/***************************************************************************
* *
* 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 glob
import re
import urllib2
import json
from shutil import copyfile
# TODO: check if all imports are needed
from qgis.core import QgsRendererRangeV2LabelFormat, QgsMessageLog, QgsFeature, QgsField, QgsStyleV2, QgsVectorGradientColorRampV2, QgsVectorLayer, QgsMapLayerRegistry, QgsGraduatedSymbolRendererV2, QgsSymbolV2, QgsRendererRangeV2
from PyQt4.QtCore import *
from PyQt4.QtGui import QAction, QIcon, QFileDialog, QMessageBox
# Initialize Qt resources from file resources.py
import resources
from geobricks_qgis_plugin_world_bank_dialog import GeobricksQgisPluginWorldBankDialog
import os.path
from qgis.gui import QgsMessageBar
from geobricks_world_bank_connector import get_world_bank_indicators_by_topic, get_world_bank_topics, get_data_by_year, get_world_bank_data, get_world_bank_indicators
from geobricks_join_layer_utils import copy_layer, create_layer, create_join_renderer, create_join_label_format
class GeobricksQgisPluginWorldBank:
"""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',
'GeobricksQgisPluginWorldBank_{}.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 = GeobricksQgisPluginWorldBankDialog()
# Declare instance attributes
self.actions = []
self.menu = self.tr(u'Download Data')
# TODO: We are going to let the user set this up in a future iteration
self.toolbar = self.iface.addToolBar(u'World Bank')
self.toolbar.setObjectName(u'GeobricksQgisPluginWorldBank')
# TODO: check if there is a better way to handle inizialition
self.initialized = False
# ID used for the messagebar
self.QGSMESSAGEBAR_ID = 'GeobricksWorldBankPlugin'
# 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('GeobricksQgisPluginWorldBank', 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.png")
action = QAction(icon, "World Bank Data", 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.addPluginToMenu(
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/GeobricksQgisPluginWorldBank/icon.png'
self.add_action(
icon_path,
text=self.tr(u''),
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.removePluginMenu(
self.tr(u'&Download Data'),
action)
self.iface.removeToolBarIcon(action)
# remove the toolbar
del self.toolbar
def process_layers(self):
download_path = self.dlg.download_path.text()
if self.dlg.download_path.text() is None or len(self.dlg.download_path.text()) == 0:
QMessageBox.critical(None, self.tr('Error'), self.tr('Please insert the download folder'))
elif (int(self.dlg.cbToYear.currentText())) - int(self.dlg.cbFromYear.currentText()) < 0:
QMessageBox.critical(None, self.tr('Error'), self.tr('Year selection is not valid'))
else:
processed_layers = 0
self.dlg.progressBar.setValue(processed_layers)
self.dlg.progressText.setText('Fetching Data from the World Bank')
indicator_name = self.dlg.cbIndicator.currentText()
indicator = self.indicators[indicator_name]
from_year = int(self.dlg.cbFromYear.currentText())
to_year = int(self.dlg.cbToYear.currentText()) + 1
total_years = to_year - from_year
layers = []
layers_not_available = []
# create tmp layer
tmp_layer = QgsVectorLayer("Polygon?crs=EPSG:4326", "tmp", "memory")
tmp_data_provider = tmp_layer.dataProvider()
# add fields
tmp_data_provider.addAttributes([QgsField("value", QVariant.Double)])
data = get_world_bank_data(indicator, str(from_year), str(to_year-1))
# copy layer
output_file = copy_layer(download_path, indicator_name)
layer = QgsVectorLayer(output_file, "layer_name", "ogr")
# create layer by year
for index, year in enumerate(range(from_year, to_year)):
self.dlg.progressText.setText('Processing ' + str(year))
data_yearly = get_data_by_year(data, year)
if len(data_yearly) > 0:
added = create_layer(layer, tmp_layer, data_yearly, year, index)
layers.append(str(year))
else:
layers_not_available.append(str(year))
# update procgress bar
processed_layers += 1
self.dlg.progressBar.setValue(int((float(processed_layers) / float(total_years)) * 100))
# commit changed on tmp layer
tmp_layer.commitChanges()
layer.commitChanges()
renderer = create_join_renderer(tmp_layer, 'value', 5, QgsGraduatedSymbolRendererV2.Jenks)
if self.dlg.open_in_qgis.isChecked():
for index, year in enumerate(reversed(layers)):
l = QgsVectorLayer(output_file, indicator_name + ' (' + str(year) + ')', "ogr")
r = renderer.clone()
r.setClassAttribute(str(year))
l.setRendererV2(r)
QgsMapLayerRegistry.instance().addMapLayer(l)
self.iface.legendInterface().setLayerVisible(l, (index == 0))
# for index, year in enumerate(range(from_year, to_year)):
# if str(year) not in layers_not_available:
# l = QgsVectorLayer(output_file, indicator_name + ' (' + str(year) + ')', "ogr")
# r = renderer.clone()
# r.setClassAttribute(str(year))
# l.setRendererV2(r)
# QgsMapLayerRegistry.instance().addMapLayer(l)
# self.iface.legendInterface().setLayerVisible(l, (index == (to_year - from_year-1)))
self.iface.mapCanvas().refresh()
self.dlg.progressText.setText('Process Finished')
if len(layers_not_available) > 0:
self.iface.messageBar().pushMessage(indicator_name, 'Data are not available for ' + ', '.join(layers_not_available) + '', level=QgsMessageBar.WARNING)
#self.dlg.close()
def process_yearly_data(self, download_path, tmp_layer, data, year, indicator, indicator_name, layers, layers_not_available):
year = str(year)
data_yearly = get_data_by_year(data, year)
if len(data_yearly) == 0:
layers_not_available.append(year)
else:
# process layer
layer_name = year + ' ' + indicator_name
QgsMessageLog.logMessage(layer_name, self.QGSMESSAGEBAR_ID, QgsMessageLog.INFO)
self.dlg.progressText.setText('Processing: ' + layer_name)
try:
# Create Layer
layer, addedValue = create_layer(download_path, tmp_layer, indicator, indicator_name, data_yearly, year)
# check if the layer has been changed
if addedValue:
layers.append(year)
else:
# TODO: give a message to the user. something like "data are not available for this year"
QgsMessageLog.logMessage("WARN: there are no data available for " + str(year), self.QGSMESSAGEBAR_ID, QgsMessageLog.WARNING)
layers_not_available.append(year)
except Exception, e:
layers_not_available.append(year)
def update_indicators_by_topic_api(self):
# WITH APIs
self.dlg.cbIndicator.clear()
topic_name = self.dlg.cbSource.currentText()
topic_id = self.topics[topic_name]
# get World Bank data indicators by topic ID
data = get_world_bank_indicators_by_topic(topic_id)
# cache codes
values = []
self.indicators = {}
for d in data:
self.indicators[d['name']] = d['id']
values.append(d['name'])
values.sort()
self.dlg.cbIndicator.addItems(values)
def update_indicators_by_topic(self):
self.dlg.cbIndicator.clear()
topic_name = self.dlg.cbSource.currentText()
data = self.topics[topic_name]
# cache codes
values = []
self.indicators = {}
for d in data:
self.indicators[d['label']] = d['code']
values.append(d['label'])
values.sort()
self.dlg.cbIndicator.addItems(values)
def update_indicators(self):
self.dlg.cbIndicator.clear()
source_name = self.dlg.cbSource.currentText()
source_id = self.sources[source_name]
# get World Bank data indicators by source ID
data = get_world_bank_indicators(source_id)
# cache codes
values = []
self.indicators = {}
for d in data:
self.indicators[d['name']] = d['id']
values.append(d['name'])
values.sort()
self.dlg.cbIndicator.addItems(values)
# def remove_tmp_path(self):
# if os.path.exists(os.path.join(os.path.dirname(os.path.realpath(__file__)), "output")):
# files = glob.glob(os.path.join(os.path.dirname(os.path.realpath(__file__)), "output", "*"))
# for f in files:
# os.remove(f)
def initialize_world_bank_topics_api(self):
topics = get_world_bank_topics()
self.topics = {}
values = []
for topic in topics:
self.topics[topic['value']] = topic['id']
values.append(topic['value'])
self.dlg.cbSource.addItems(values)
def initialize_world_bank_topics(self):
with open(os.path.join(os.path.dirname(os.path.realpath(__file__)), 'resources', 'world_bank_indicators.json')) as data_file:
topics = json.load(data_file)
self.topics = {}
values = []
for topic in topics:
for key, indicators in topic.iteritems():
self.topics[key] = indicators
values.append(key)
self.dlg.cbSource.addItems(values)
def initialize_years(self):
# TODO: load the years dinamically
values = []
for year in range(2014, 1980, -1):
values.append(str(year))
self.dlg.cbFromYear.addItems(values)
self.dlg.cbToYear.addItems(values)
def select_output_file(self):
filename = QFileDialog.getExistingDirectory(self.dlg, "Select Folder")
self.dlg.download_path.setText(filename)
def run(self):
# if the interface is initiated
if self.initialized:
self.dlg.progressText.setText('')
self.dlg.progressBar.setValue(0)
if not self.initialized:
# dirty check if interface was already initialized
self.initialized = True
# removing tmp old layers
#self.remove_tmp_path()
# initialize selectors
# self.initialize_sources()
self.initialize_world_bank_topics()
self.initialize_years()
# call first indicator
# self.update_indicators()
# self.dlg.cbSource.currentIndexChanged.connect(self.update_indicators)
self.update_indicators_by_topic()
self.dlg.cbSource.currentIndexChanged.connect(self.update_indicators_by_topic)
# add select download folder
self.dlg.pushButton.clicked.connect(self.select_output_file)
# on OK and Cancel click
self.dlg.buttonBox.accepted.connect(self.process_layers)
self.dlg.buttonBox.rejected.connect(self.dlg.close)
# show the dialog
self.dlg.show()