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redistricting_dock.py
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redistricting_dock.py
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# -*- coding: utf-8 -*-
"""
/***************************************************************************
Redistricting
Electorate Rebalancing and Redistricting
-------------------
begin : 2014-07-06
git sha : $Format:%H$
copyright : (C) 2014 by Sean Lin
email : seanlinmt at gmail dot 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. *
* *
***************************************************************************/
"""
from builtins import map
from builtins import str
from qgis.core import Qgis, QgsRectangle, QgsCoordinateTransform, QgsVectorLayer, \
QgsPalLayerSettings, QgsSymbol, QgsRendererCategory, QgsPointXY, \
QgsCategorizedSymbolRenderer, QgsFeatureRequest, QgsGeometry, QgsExpression, QgsProject, QgsWkbTypes, \
QgsTextFormat, QgsRuleBasedLabeling, QgsVectorLayerSimpleLabeling
from qgis.gui import QgsMapToolEmitPoint, QgsRubberBand
from qgis.PyQt import uic, QtCore, QtGui, QtWidgets
from qgis.PyQt.QtCore import Qt, QObject, QVariant, pyqtSignal
import json
import os
import math
import codecs
from .balancer import Balancer
from . import configuration as config
from helper.qgis_util import extend_qgis_interface
from helper.string_util import parse_float
from .configuration import KEY_AREA, KEY_CIRCULARITY, KEY_COMPACTNESS, KEY_VOTERS
from .layer_type import LayerType
import statistics
FORM_CLASS, _ = uic.loadUiType(os.path.join(os.path.dirname(__file__), 'ui_redistricting_dock.ui'))
CONFIG_FORM_CLASS, _ = uic.loadUiType(os.path.join(os.path.dirname(__file__), 'ui_configuration.ui'))
CONSTITUENCIES_FORM_CLASS, _ = uic.loadUiType(
os.path.join(os.path.dirname(__file__), 'ui_redistricting_constituencies.ui'))
STATS_WIDGET, _ = uic.loadUiType(os.path.join(os.path.dirname(__file__), 'ui_widget_statistics.ui'))
class RedistrictingDock(QtWidgets.QDockWidget, FORM_CLASS):
closingPlugin = pyqtSignal()
def __init__(self, iface, parent=None):
"""Constructor."""
super(RedistrictingDock, self).__init__(parent)
self.setupUi(self)
# get project instance
self.project = QgsProject.instance()
# load configuration
config.Configuration().load()
# coordinate transform
self.coordinateTransform = None
# threads
self.thread = None
self.worker = None
self.progressBar = None
# init the sub dialogs
self.configuration = DelimitationToolboxConfigDialog(self)
self.configuration.saved.connect(self.populate_state_selector)
self.constituencies = RedistrictingConstituenciesDialog(self)
# init widgets
self.stats_old = QStatsWidget()
self.layout_stats_old.addWidget(self.stats_old)
self.stats_new = QStatsWidget()
self.layout_stats_new.addWidget(self.stats_new)
self.topology = None
self.id_graph = None
self.balancer_new = None
self.balancer_old = None
self.layer_id = None
# extensions
self.iface = extend_qgis_interface(iface)
self.clickTool_prev = None
self.clickTool = DelimitationMapTool(self.iface.mapCanvas())
self.clickTool.canvasDoubleClicked.connect(self.canvas_doubleclicked)
self.clickTool.canvasSingleClicked.connect(self.canvas_clicked)
# manual rebalancer
self.balancer_started = False
self.clicked_feature_id = None
self.layer = None
self.context_fieldname = None
self.polling_old_fieldname = None
self.state_old_fieldname = None
self.par_old_fieldname = None
self.state_new_fieldname = None
self.par_new_fieldname = None
self.polling_new_fieldname = None
self.par_new_prefix = None
self.btLoadLayer.clicked.connect(self.layer_select)
self.btShowTopology.clicked.connect(self.constituencies.show)
self.tab_rebalance.currentChanged.connect(self.tab_change_handler)
# todo : dropping layers and files
self.btRenumber.clicked.connect(self.layer_renumber)
self.btRebalance.clicked.connect(self.balancer_start)
self.btRebalanceStop.clicked.connect(self.balancer_stop)
self.btEditConfig.clicked.connect(self.configuration.show)
self.btDuplicate.clicked.connect(self.layer_copy_old)
self.btRedrawLayer.clicked.connect(self.layer_redraw)
self.selector_state.currentIndexChanged.connect(self.live_show)
self.selector_par.currentIndexChanged.connect(self.live_show)
# http://qgis.org/api/classQgsMapCanvas.html
self.cb_label.stateChanged.connect(self.label_update)
self.cb_feature_id.stateChanged.connect(self.label_update)
self.cb_old_id.stateChanged.connect(self.label_update)
# monitor layer selection change
self.btClearSelected.clicked.connect(self.selection_clear)
self.btReset.clicked.connect(self.layer_reset)
self.btUpdateAttributes.clicked.connect(self.selection_update)
self.iface.mapCanvas().layersChanged.connect(self.layer_changed)
self.selector_layers.currentIndexChanged.connect(self.layer_preload)
# populate state
self.populate_state_selector()
self.selector_par_old.currentIndexChanged[int].connect(self.load_par_field)
self.selector_state_old.currentIndexChanged[int].connect(self.load_state_field)
def closeEvent(self, event):
self.closingPlugin.emit()
event.accept()
self.balancer_stop()
self.constituencies.close()
self.iface.mapCanvas().layersChanged.disconnect(self.layer_changed)
self.clickTool.canvasDoubleClicked.disconnect(self.canvas_doubleclicked)
self.clickTool.canvasSingleClicked.disconnect(self.canvas_clicked)
self.layer = None
@staticmethod
def extract_stats(dic, key):
itemlist = []
for v in dic.values():
itemlist.append(v[key])
min_value = min(itemlist)
max_value = max(itemlist)
median = statistics.median(itemlist)
return min_value, median, max_value
def statistics_update(self):
total_area = math.fsum([v[config.KEY_GEOMETRY].area()
for v in list(self.balancer_old.topology_par.values())]) / 1000 / 1000
self.label_total_area.setText("{:.0f} sqr kms".format(total_area))
self.label_context_total.setText(str(self.balancer_old.total_voters))
self.label_context_label.setText("{}".format(self.context_fieldname))
self.label_stats_eq.setText(parse_float("{}%".format(self.tbDelta.text()) * 100))
# old stats
self.balancer_old.statistics_calculate(self.coordinateTransform)
old_areas_state = self.extract_stats(self.balancer_old.state_statistics, KEY_AREA)
old_circularity_state = self.extract_stats(self.balancer_old.state_statistics, KEY_CIRCULARITY)
old_areas_par = self.extract_stats(self.balancer_old.par_statistics, KEY_AREA)
old_circularity_par = self.extract_stats(self.balancer_old.par_statistics, KEY_CIRCULARITY)
old_unused = self.balancer_old.get_unused()
if old_areas_par.__len__():
self.stats_old.setParValues(old_unused[0].__len__(),
self.balancer_old.par_count_limit,
self.balancer_old.parmin_actual_percentage,
self.balancer_old.parmax_actual_percentage,
self.balancer_old.par_average,
old_areas_par,
old_circularity_par)
if old_areas_state.__len__():
self.stats_old.setStateValues(old_unused[1].__len__(),
self.balancer_old.state_count_limit,
self.balancer_old.statemin_actual_percentage,
self.balancer_old.statemax_actual_percentage,
self.balancer_old.state_average,
old_areas_state,
old_circularity_state)
# new stats
self.balancer_new.statistics_calculate(self.coordinateTransform)
new_areas_state = self.extract_stats(self.balancer_new.state_statistics, KEY_AREA)
new_circularity_state = self.extract_stats(self.balancer_new.state_statistics, KEY_CIRCULARITY)
new_areas_par = self.extract_stats(self.balancer_new.par_statistics, KEY_AREA)
new_circularity_par = self.extract_stats(self.balancer_new.par_statistics, KEY_CIRCULARITY)
new_unused = self.balancer_new.get_unused()
if new_areas_par.__len__():
self.stats_new.setParValues(new_unused[0].__len__(),
self.balancer_new.par_count_limit,
self.balancer_new.parmin_actual_percentage,
self.balancer_new.parmax_actual_percentage,
self.balancer_new.par_average,
new_areas_par,
new_circularity_par)
if new_areas_state.__len__():
self.stats_new.setStateValues(new_unused[1].__len__(),
self.balancer_new.state_count_limit,
self.balancer_new.statemin_actual_percentage,
self.balancer_new.statemax_actual_percentage,
self.balancer_new.state_average,
new_areas_state,
new_circularity_state)
def load_par_field(self, index):
if not self.layer or index < 1:
return
par_fieldname = self.selector_par_old.currentText()
pars = set()
for f in self.layer.getFeatures():
if par_fieldname:
pars.add(f[par_fieldname])
self.tb_old_par_count.setText(str(pars.__len__()))
if not self.tb_new_par_count.text():
self.tb_new_par_count.setText(str(pars.__len__()))
def load_state_field(self, index):
if not self.layer or index < 1:
return
state_fieldname = self.selector_state_old.currentText()
states = set()
for f in self.layer.getFeatures():
if state_fieldname:
states.add(f[state_fieldname])
self.tb_old_state_count.setText(str(states.__len__()))
if not self.tb_new_state_count.text():
self.tb_new_state_count.setText(str(states.__len__()))
def live_show(self):
"""update totals and statistics"""
if not self.layer:
return
if self.selector_state.currentIndex() == -1 or self.selector_par.currentIndex() == -1:
return
selectedfeatureids = self.layer.selectedFeatureIds()
self.label_selected.setText("Selected ({})".format(len(selectedfeatureids)))
current_state = self.selector_state.itemData(self.selector_state.currentIndex())
current_par = self.selector_par.itemData(self.selector_par.currentIndex())
balancer = self.get_balancer()
totals = balancer.calculate_live_totals(current_par, current_state, selectedfeatureids)
voters_par = totals[0]
voters_state = totals[1]
voters_selected = totals[2]
# number of state seats in current parliament seat
if str(current_par) in balancer.map_par_state:
states_per_par = balancer.map_par_state[str(current_par)]['states'].__len__()
else:
states_per_par = "-"
self.label_state_voters.setText(str(voters_state))
self.label_par_voters.setText("{} ({})".format(voters_par, states_per_par))
self.lb_recommendation.setText(balancer.recommendation_by_par(str(current_par)))
if balancer.state_average:
delta_state = voters_state - balancer.state_average
delta_state_percentage = 100 * delta_state / balancer.state_average
self.label_delta_state.setText("{:.2f}%".format(delta_state_percentage))
self.label_delta_state.setToolTip("{:.0f}".format(delta_state))
self.label_selected_state.setText("{:.2f}%".format(100 * voters_selected / balancer.state_average))
self.label_selected_state.setToolTip("{}".format(voters_selected))
if balancer.par_average:
delta_par = voters_par - balancer.par_average
delta_par_percentage = 100 * delta_par / balancer.par_average
self.label_delta_par.setText("{:.2f}%".format(delta_par_percentage))
self.label_delta_par.setToolTip("{:.0f}".format(delta_par))
self.label_selected_par.setText("{:.2f}%".format(100 * voters_selected / balancer.par_average))
self.label_selected_par.setToolTip("{}".format(voters_selected))
def layer_copy_old(self):
import re
confirmation = QtWidgets.QMessageBox.question(self,
"Overwrite values",
"Are you sure? Any newly allocated IDs will be overwritten.",
QtWidgets.QMessageBox.Yes | QtWidgets.QMessageBox.No)
if confirmation == QtWidgets.QMessageBox.No:
return
delta = self.get_delta()
if not delta:
return
# get all values then sort by PAR and then by STATE which returns a tuple
attributes_old = sorted(list(self.balancer_old.topology_polling.items()),
key=lambda x: (x[1][self.par_old_fieldname],
x[1][self.state_old_fieldname],
x[1][self.polling_old_fieldname]))
par_format = self.balancer_new.par_prefix_format
state_format = self.balancer_new.state_prefix_format
poll_format = self.balancer_new.polling_prefix_format
regexp = r"(\d+)"
base_par = int(re.match(regexp, attributes_old[0][1][self.par_old_fieldname], re.I).group(1))
# http://gis.stackexchange.com/questions/58296/speed-of-editing-attributes-in-qgis-from-a-python-plugin
self.layer.startEditing()
for row in attributes_old:
old_par = int(re.match(regexp, row[1][self.par_old_fieldname], re.I).group(1))
old_state = int(re.match(regexp, row[1][self.state_old_fieldname], re.I).group(1))
old_polling = int(re.match(regexp, row[1][self.polling_old_fieldname], re.I).group(1))
new_par = par_format % (old_par - base_par + 1)
new_state = state_format % old_state
new_polling = poll_format % old_polling
self.balancer_new.topology_update(
{row[0]: {
self.state_new_fieldname: new_state,
self.par_new_fieldname: new_par,
self.polling_new_fieldname: new_polling}})
self.layer.commitChanges()
self.balancer_new.topology_dirty = True
self.layer_redraw(True)
self.iface.info("Done")
def layer_reset(self):
confirmation = QtWidgets.QMessageBox.question(self,
"Reset values",
"Are you sure? This operation will permanently remove all new "
"allocated IDs. You will need to start all over again from the "
"beginning.",
QtWidgets.QMessageBox.Yes | QtWidgets.QMessageBox.No)
if confirmation == QtWidgets.QMessageBox.No:
return
self.layer.startEditing()
for k, v in list(self.balancer_new.topology_polling.items()):
self.layer.changeAttributeValue(k, self.layer.fields().indexFromName(self.polling_new_fieldname), None)
self.layer.changeAttributeValue(k, self.layer.fields().indexFromName(self.state_new_fieldname), None)
self.layer.changeAttributeValue(k, self.layer.fields().indexFromName(self.par_new_fieldname), None)
self.layer.commitChanges()
self.balancer_new.topology_dirty = True
self.layer_redraw(True)
self.iface.info("Attribute fields reset")
def label_update(self):
label = QgsPalLayerSettings()
if self.cb_label.isChecked() or self.cb_feature_id.isChecked():
label.enabled = True
self.layer.setLabelsEnabled(True)
else:
label.enabled = False
self.layer.setLabelsEnabled(False)
expr = []
balancer = self.get_balancer()
if self.cb_feature_id.isChecked():
if self.cb_old_id.isChecked():
# force display of old ID
expr.append(self.balancer_old.get_feature_label())
else:
expr.append(balancer.get_feature_label())
if self.cb_label.isChecked():
if self.selector_seat_type.currentIndex() == 1:
divisor = balancer.par_average
elif self.selector_seat_type.currentIndex() == 0:
divisor = balancer.state_average
else:
raise Exception("Unknown seat type")
if expr.__len__():
expr.append("'\\n'")
expr.append("round({}*100.0/{}, 2)".format(self.context_fieldname, divisor))
label.fieldName = "concat({})".format(",".join(expr))
label.isExpression = True
label.placement = QgsPalLayerSettings.OverPoint
text_format = QgsTextFormat()
text_format.setSize(8)
label.setFormat(text_format)
labeler = QgsVectorLayerSimpleLabeling(label)
self.layer.setLabeling(labeler)
self.layer.triggerRepaint()
def tab_change_handler(self, index):
if index == 3:
self.statistics_update()
def ui_state_save(self):
saved_state = {}
for widget in self.findChildren(QtWidgets.QComboBox):
saved_state.update({widget.objectName(): widget.currentIndex()})
for widget in self.findChildren(QtWidgets.QLineEdit):
saved_state.update({widget.objectName(): widget.text()})
config.Configuration().store_qt(config.Configuration.UI_STATE, json.dumps(saved_state))
def ui_state_load(self, excludes=None):
if not excludes:
excludes = []
try:
saved_state = json.loads(config.Configuration().read_qt(config.Configuration.UI_STATE))
except:
return
for widget in self.findChildren(QtWidgets.QComboBox):
if widget.objectName() in saved_state and widget.objectName() not in excludes:
widget.setCurrentIndex(saved_state[widget.objectName()])
for widget in self.findChildren(QtWidgets.QLineEdit):
if widget.objectName() in saved_state and widget.objectName() not in excludes:
widget.setText(saved_state[widget.objectName()])
def layer_select(self):
# startdir = Configuration().read_qt(Configuration.SRC_DIR)
startdir = os.path.join(os.path.split(__file__)[0], "data")
filepath, __ = QtWidgets.QFileDialog.getOpenFileName(parent=self,
caption='Select file',
filter="*.shp;*.gpkg",
directory=startdir)
if filepath:
path, filename = os.path.split(filepath)
# remember selected path
config.Configuration().store_qt(config.Configuration.SRC_DIR, path)
name, ext = os.path.splitext(filename)
# don't assign layer to self yet. only after balancer has started
layer = QgsVectorLayer(filepath, name, "ogr")
# layer = self.iface.addVectorLayer(filepath, name, "ogr")
if not layer.isValid():
self.iface.error("Layer failed to load!")
return
self.project.addMapLayer(layer)
self.layer_add_to_selector(layer)
def layer_preload(self, index):
layer_id = self.selector_layers.itemData(index)
if layer_id in self.project.mapLayers():
self.layer = self.project.mapLayers()[layer_id]
self.layer_load()
def layer_add_to_selector(self, layer):
self.selector_layers.addItem(layer.name(), layer.id())
def layer_changed(self):
layer_found = False
selected_index = self.selector_layers.currentIndex()
layer_id = self.selector_layers.itemData(selected_index)
if layer_id in self.project.mapLayers():
layer = self.project.mapLayers()[layer_id]
layer_found = True
if self.selector_layers.findData(layer.id()) == -1 and \
layer.type() == layer.VectorLayer and \
layer.geometryType() == QgsWkbTypes.PolygonGeometry:
self.layer_add_to_selector(layer)
if not layer_found:
# handle just started
if selected_index != -1:
self.selector_layers.removeItem(selected_index)
else:
if self.selector_layers.count() != 0:
selected_index = 0
self.selector_layers.setCurrentIndex(selected_index)
layer_found = True
if layer_found:
self.layer_preload(selected_index)
else:
if self.balancer_started:
self.balancer_stop()
else:
self.layer = None
return layer_found
def layer_selectors_clear(self):
self.selector_context.clear()
self.selector_polling_old.clear()
self.selector_state_old.clear()
self.selector_par_old.clear()
self.selector_state_new.clear()
self.selector_par_new.clear()
self.selector_polling_new.clear()
self.selector_context.addItem("Select field ...", "")
self.selector_polling_old.addItem("Select poll district ...", "")
self.selector_state_old.addItem("Select state ...", "")
self.selector_par_old.addItem("Select par ...", "")
self.selector_state_new.addItem("Select state ...", "")
self.selector_par_new.addItem("Select par ...", "")
self.selector_polling_new.addItem("Select poll district ...", "")
def layer_load(self):
self.layer_selectors_clear()
if self.layer is None:
return
self.iface.info("Reading layer definition {}".format(self.layer.id()))
provider = self.layer.dataProvider()
fields = provider.fields()
try:
for field in fields:
field_name = field.name()
self.selector_context.addItem(field_name, field_name)
self.selector_polling_old.addItem(field_name, field_name)
self.selector_state_old.addItem(field_name, field_name)
self.selector_par_old.addItem(field_name, field_name)
self.selector_state_new.addItem(field_name, field_name)
self.selector_par_new.addItem(field_name, field_name)
self.selector_polling_new.addItem(field_name, field_name)
except Exception as e:
self.iface.error(e.message)
finally:
del provider
# load save state
self.ui_state_load(["selector_layers", "selector_map_type"])
def layer_redraw(self, zoom_to_layer=False):
if not self.balancer_started:
self.iface.warning("balancer_not_started")
return
delta = self.get_delta()
if not delta:
return
# update info
self.label_map_type.setText(self.selector_map_type.currentText())
balancer = self.get_balancer()
balancer.topology_load()
balancer.init_colouring()
# init selectors
self.feature_selector_init()
# update label parameters
self.label_update()
seat_type = self.selector_seat_type.currentIndex()
if seat_type == 0:
# state
get_colour_method = balancer.get_colour_by_state
attr_prefix = balancer.state_prefix_format
attr_name = balancer.state_field
colouring = balancer.colouring_state
self.label_context_type.setText("State")
else:
# par
get_colour_method = balancer.get_colour_by_parliament
attr_prefix = balancer.par_prefix_format
attr_name = balancer.par_field
colouring = balancer.colouring_par
self.label_context_type.setText("Parliament")
geomtype = self.layer.geometryType()
if self.selector_overlay_type.currentIndex() == 2:
# load adjacency layers
name = self.selector_target_state.currentText()
state_alayer = balancer.adjlayer_make(name, LayerType.State)
par_alayer = balancer.adjlayer_make(name, LayerType.Parliament)
existing_layerids = []
for lyr in [state_alayer, par_alayer]:
existing_layerids.extend(
[x.id() for x in self.project.mapLayersByName(lyr.name()) if x is not None])
self.project.removeMapLayers(existing_layerids)
self.project.addMapLayer(state_alayer)
self.project.addMapLayer(par_alayer)
return
# balancer
categories = []
# add blank category for unallocated features
empty_symbol = QgsSymbol.defaultSymbol(geomtype)
empty_symbol.setColor(QtGui.QColor('white'))
empty_category = QgsRendererCategory("", empty_symbol, "")
categories.append(empty_category)
for k, v in colouring.gColouring.items():
if self.selector_overlay_type.currentIndex() == 1:
colour = get_colour_method(k, v)
elif self.selector_overlay_type.currentIndex() == 0:
colour = colouring.get_colour(v)
else:
self.iface.warning("That analysis option is not available yet")
return
if not colour:
continue
symbol = QgsSymbol.defaultSymbol(geomtype)
symbol.setColor(QtGui.QColor(colour.hex))
val = attr_prefix % int(k)
category = QgsRendererCategory(val, symbol, val)
categories.append(category)
# create the renderer and assign it to a layer
renderer = QgsCategorizedSymbolRenderer(attr_name, categories)
self.layer.setRenderer(renderer)
# self.iface.mapCanvas().setDirty(True)
self.iface.mapCanvas().clearCache()
"""
if zoom_to_layer:
extent = self.iface.mapCanvas().mapSettings().layerToMapCoordinates(self.layer, self.layer.extent())
self.iface.mapCanvas().setExtent(extent)
self.iface.mapCanvas().zoomToNextExtent()
"""
self.iface.mapCanvas().refresh()
def layer_renumber(self):
balancer = self.get_balancer()
if balancer.readonly:
self.iface.warning("You cannot edit the old map. Please select the new map.")
return
confirmation = QtWidgets.QMessageBox.question(self,
"Reorder allocation",
"Are you sure? This will renumber and " +
"reorganise all the parliament, state and polling district IDs.",
QtWidgets.QMessageBox.Yes | QtWidgets.QMessageBox.No)
if confirmation == QtWidgets.QMessageBox.No:
return
self.layer.startEditing()
if not self.balancer_new.resequence():
self.iface.error("Renumber failed! There are geometry errors. Please run geometry and topology checker.")
self.layer.rollBack()
self.layer.endEditCommand()
return
par_used = [v[self.par_new_fieldname] for v in list(self.balancer_new.topology_polling.values())]
state_used = [v[self.state_new_fieldname] for v in list(self.balancer_new.topology_polling.values())]
if set(par_used).__len__() > self.balancer_new.par_count_limit or \
set(state_used).__len__() > self.balancer_new.state_count_limit:
self.iface.error("Allocation limit exceeded")
self.layer.rollBack()
self.layer.endEditCommand()
return
self.layer.commitChanges()
self.iface.info("Renumbering completed.")
self.layer_redraw(True)
def canvas_doubleclicked(self, point, button):
current_state = self.selector_state.itemData(self.selector_state.currentIndex())
current_par = self.selector_par.itemData(self.selector_par.currentIndex())
balancer = self.get_balancer()
par_field = balancer.par_field
state_field = balancer.state_field
ids = []
if button == Qt.LeftButton:
if current_state and current_par:
ids = [int(k) for k, v in list(balancer.topology_polling.items())
if v[par_field] == str(current_par) and v[state_field] == str(current_state)]
elif button == Qt.RightButton:
if current_par:
ids = [int(k) for k, v in list(balancer.topology_polling.items())
if v[par_field] == str(current_par)]
else:
self.iface.warning("What button did you just click??")
return
if set(ids) \
.difference(self.layer.selectedFeatureIds()) \
.difference([self.clicked_feature_id]) \
.__len__() == 0:
self.layer.modifySelection([], ids)
else:
self.layer.modifySelection(ids, [])
def canvas_rectangle(self, p):
# setup the provider select to filter results based on a rectangle
point = QgsGeometry().fromPointXY(p)
# scale-dependent buffer of 2 pixels-worth of map units
buff = point.buffer((self.iface.mapCanvas().mapUnitsPerPixel() * 2), 0)
rect_pseudo = buff.boundingBox()
rect = self.iface.mapCanvas().mapSettings().mapToLayerCoordinates(self.layer, rect_pseudo)
return rect
def canvas_clicked(self, geom, button):
import re
if not self.balancer_started:
self.iface.warning("balancer_not_started")
return
if self.layer is None:
self.iface.warning("Active layer not found")
return
rect = None
if type(geom) is QgsPointXY:
rect = self.canvas_rectangle(geom)
elif type(geom) is QgsRectangle:
rect = geom
feats = []
balancer = self.get_balancer()
for f in balancer.topology_polling.items():
if f[1][config.KEY_GEOMETRY].intersects(rect):
feats.append(f)
if feats.__len__() == 0:
self.layer.removeSelection()
return
# changed_feature = (feature id, values)
changed_feature = feats[0]
self.clicked_feature_id = changed_feature[0]
if button == Qt.RightButton:
# update selectors & recalculate
balancer = self.get_balancer()
self.tab_rebalance.setCurrentIndex(1)
# changed_feature = (feature id, values)
raw_par = changed_feature[1][balancer.par_field]
if raw_par:
par_val = int(re.search(r'\d+', str(raw_par)).group())
selector_par_index = self.selector_par.findData(par_val)
if selector_par_index != -1:
self.selector_par.setCurrentIndex(selector_par_index)
raw_state = changed_feature[1][balancer.state_field]
if raw_state:
state_val = int(re.search(r'\d+', str(raw_state)).group())
selector_state_index = self.selector_state.findData(state_val)
if selector_state_index != -1:
self.selector_state.setCurrentIndex(selector_state_index)
self.live_show()
else:
# toggle selection & recalculate
self.layer.invertSelectionInRectangle(rect)
def populate_state_selector(self):
self.selector_target_state.clear()
self.selector_target_state.addItem("Select state ...", "")
list(
map(lambda x: self.selector_target_state.addItem(x[0], x[1] if x.__len__() == 2 else ""),
[entry.split(':')
for entry in config.Configuration().read("Settings", "state_prefixes")]))
def selection_update(self):
if not self.balancer_started:
self.iface.warning("balancer_not_started")
return
balancer = self.get_balancer()
# don't allow write to old layer
if balancer.readonly:
self.iface.warning("Old map is read only. Please switch to the new map for rebalancing.")
return
if len(self.layer.selectedFeatures()) == 0:
self.iface.warning("Nothing selected. Click on a feature to select it.")
return
current_state = balancer.state_prefix_format % self.selector_state.itemData(
self.selector_state.currentIndex())
current_par = balancer.par_prefix_format % self.selector_par.itemData(self.selector_par.currentIndex())
confirmation = QtWidgets.QMessageBox.question(self,
"Confirm action",
"Move selected features to the following constituencies?\n\n" +
"Parliament:{}\nState:{}".format(current_par, current_state),
QtWidgets.QMessageBox.Yes | QtWidgets.QMessageBox.No)
if confirmation == QtWidgets.QMessageBox.Yes:
self.layer.startEditing()
updates = [(current_par, current_state)]
for f in self.layer.selectedFeatures():
updates.append((f[self.par_new_fieldname], f[self.state_new_fieldname]))
balancer.topology_update(
{f.id(): {self.state_new_fieldname: current_state,
self.par_new_fieldname: current_par}})
# renumber POLLs in the changed
for entry in updates:
filter_expression = "'{}' = '{}' AND '{}' = '{}'" \
.format(self.par_new_fieldname,
entry[0],
self.state_new_fieldname,
entry[1])
req = QgsFeatureRequest(QgsExpression(filter_expression))
for i, f in enumerate(self.layer.getFeatures(req)):
balancer.topology_update(
{f.id(): {self.polling_new_fieldname: balancer.polling_prefix_format % (i + 1)}})
self.layer.commitChanges()
self.selection_clear()
self.layer_redraw(False)
self.iface.info("Selected features updated")
def selection_clear(self):
if self.layer is None:
return
self.layer.removeSelection()
def get_balancer(self):
"""0=old map, 1=new map"""
if self.label_map_type.text() == self.selector_map_type.itemData(1, Qt.DisplayRole):
return self.balancer_new
return self.balancer_old
def get_delta(self):
delta = parse_float(self.tbDelta.text())
if not delta or delta < 0:
self.iface.info("Please specify a value greater than 0")
return delta
def balancer_destroy(self):
self.balancer_old = None
self.balancer_new = None
def balancer_start(self):
if not self.layer:
self.iface.error(
"Redistricting plugin not started. Layer is missing, invalid or changed externally. Please reload "
"layer.")
return
# save state
self.ui_state_save()
self.iface.mapCanvas().setCurrentLayer(self.layer)
if not self.tb_new_par_count.text().isdigit() or \
not self.tb_new_state_count.text().isdigit():
self.iface.error("Total parliamentary and state seats must be integer values")
return
delta = self.get_delta()
if (self.selector_context.currentIndex() <= 0 or
self.selector_polling_old.currentIndex() <= 0 or
self.selector_state_old.currentIndex() <= 0 or
self.selector_par_old.currentIndex() <= 0 or
self.selector_state_new.currentIndex() <= 0 or
self.selector_par_new.currentIndex() <= 0 or
self.selector_polling_new.currentIndex() <= 0 or
self.selector_target_state.currentIndex() <= 0 or
not delta or
not self.tb_new_par_count.text() or
not self.tb_new_state_count.text()):
self.iface.error("Some fields are unspecified")
return
layer_crs = self.layer.dataProvider().crs()
if layer_crs.projectionAcronym() != 'merc' or \
self.iface.mapCanvas().mapSettings().destinationCrs().projectionAcronym() != 'merc':
self.iface.warning(
"The current working layer is not using a mercator projection like EPSG:3857. Area calculations will not work.")
provider = self.layer.dataProvider()
self.coordinateTransform = QgsCoordinateTransform(layer_crs,
self.iface.mapCanvas().mapSettings().destinationCrs(),
self.project)
err_fields = []
self.context_fieldname = self.selector_context.itemData(self.selector_context.currentIndex())
if not provider.fields().at(provider.fieldNameIndex(self.context_fieldname)).isNumeric():
self.iface.error("The {} (voters field) must be an integer number field.".format(self.context_fieldname))
del provider
return
self.polling_old_fieldname = self.selector_polling_old.itemData(self.selector_polling_old.currentIndex())
self.par_new_prefix = self.selector_target_state.itemData(self.selector_target_state.currentIndex())
# the following needs to be text fields
self.state_old_fieldname = self.selector_state_old.itemData(self.selector_state_old.currentIndex())
if provider.fields().at(provider.fieldNameIndex(self.state_old_fieldname)).type() != QVariant.String:
err_fields.append(self.state_old_fieldname)
self.par_old_fieldname = self.selector_par_old.itemData(self.selector_par_old.currentIndex())
if provider.fields().at(provider.fieldNameIndex(self.par_old_fieldname)).type() != QVariant.String:
err_fields.append(self.par_old_fieldname)
self.state_new_fieldname = self.selector_state_new.itemData(self.selector_state_new.currentIndex())
if provider.fields().at(provider.fieldNameIndex(self.state_new_fieldname)).type() != QVariant.String:
err_fields.append(self.state_new_fieldname)
self.par_new_fieldname = self.selector_par_new.itemData(self.selector_par_new.currentIndex())
if provider.fields().at(provider.fieldNameIndex(self.par_new_fieldname)).type() != QVariant.String:
err_fields.append(self.par_new_fieldname)
self.polling_new_fieldname = self.selector_polling_new.itemData(self.selector_polling_new.currentIndex())
del provider
if err_fields.__len__() != 0:
self.iface.error("The following fields must be text fields: {}".format(", ".join(err_fields)))
return
if self.layer_id != self.layer.id():
self.balancer_destroy()
self.layer_id = self.layer.id()
try:
# just need to do this once as this layer doesn't ever get changed
if self.balancer_old is None:
self.balancer_old = Balancer("old", self.layer,
self.context_fieldname,
self.polling_old_fieldname,
self.state_old_fieldname,
self.par_old_fieldname,
delta)
self.balancer_new = Balancer("new", self.layer,
self.context_fieldname,
self.polling_new_fieldname,
self.state_new_fieldname,
self.par_new_fieldname,
delta,
par_count_limit=int(self.tb_new_par_count.text()),
state_count_limit=int(self.tb_new_state_count.text()),
state_prefix_format="N%03d",
par_prefix_format="{}%02d".format(self.par_new_prefix),
polling_prefix_format="%02d",
readonly=False)
except AttributeError as attr_e:
self.iface.error("Specified fields must be part of a sequence of numbers")
self.balancer_destroy()
return
self.layer.selectionChanged.connect(self.live_show)
# init click tool
self.clickTool_prev = self.iface.mapCanvas().mapTool()
self.iface.mapCanvas().setMapTool(self.clickTool)
self.balancer_started = True
self.panel_active.setCurrentIndex(1)
self.iface.info("{} features found. Redistricting plugin started ({})."
.format(list(self.balancer_old.topology_polling.keys()).__len__(),
self.layer.id()), 4)
self.layer_redraw(True)
def feature_selector_init(self):
selected_state = self.selector_state.currentIndex()
selected_par = self.selector_par.currentIndex()
self.selector_state.clear()
self.selector_par.clear()
balancer = self.get_balancer()
unused = balancer.get_unused()
unused_colour = QtGui.QColor(Qt.green)
for i, s in enumerate(balancer.get_state_code_sequence()):
self.selector_state.insertItem(i, balancer.state_prefix_format % s, s)
if str(s) in unused[1]:
self.selector_state.setItemData(i, unused_colour, Qt.BackgroundRole)