Source code for svir.dialogs.transformation_dialog

# -*- coding: utf-8 -*-
#/***************************************************************************
# Irmt
#                                 A QGIS plugin
# OpenQuake Integrated Risk Modelling Toolkit
#                              -------------------
#        begin                : 2013-10-24
#        copyright            : (C) 2014 by GEM Foundation
#        email                : devops@openquake.org
# ***************************************************************************/
#
# OpenQuake is free software: you can redistribute it and/or modify it
# under the terms of the GNU Affero General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# OpenQuake is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with OpenQuake.  If not, see <http://www.gnu.org/licenses/>.

from PyQt4.QtCore import pyqtSlot
from PyQt4.QtGui import (QDialog,
                         QDialogButtonBox)

from svir.ui.ui_transformation import Ui_TransformationDialog
from svir.calculations.transformation_algs import (RANK_VARIANTS,
                                                   QUADRATIC_VARIANTS,
                                                   LOG10_VARIANTS,
                                                   TRANSFORMATION_ALGS)
from svir.utilities.shared import NUMERIC_FIELD_TYPES
from svir.calculations.process_layer import ProcessLayer


[docs]class TransformationDialog(QDialog): """ Modal dialog giving to the user the possibility to transform one or multiple attributes in the active layer, using one of the available algorithms and variants. """ def __init__(self, iface): QDialog.__init__(self) self.iface = iface self.attr_name_user_def = False self.use_advanced = False # Set up the user interface from Designer. self.ui = Ui_TransformationDialog() self.ui.setupUi(self) self.ok_button = self.ui.buttonBox.button(QDialogButtonBox.Ok) self.fill_fields_multiselect() alg_list = TRANSFORMATION_ALGS.keys() self.ui.algorithm_cbx.addItems(alg_list) if self.ui.algorithm_cbx.currentText() in ['RANK', 'QUADRATIC']: self.reload_variant_cbx() self.ui.inverse_ckb.setDisabled( self.ui.algorithm_cbx.currentText() in ['LOG10']) self.ui.warning_lbl.hide() self.ui.warning_lbl.setText( "<font color='red'>" "WARNING: the original attribute will be overwritten by the" " results of the transformation (it can not be undone)" "</font>") self.ui.fields_multiselect.selection_changed.connect( self.set_ok_button) self.ui.fields_multiselect.selection_changed.connect( self.set_new_field_editable) self.ui.fields_multiselect.selection_changed.connect( self.update_default_fieldname) self.set_ok_button() self.set_new_field_editable()
[docs] def set_ok_button(self): self.ok_button.setEnabled( self.ui.fields_multiselect.selected_widget.count() > 0)
[docs] def set_new_field_editable(self): n_fields_selected = self.ui.fields_multiselect.selected_widget.count() self.ui.new_field_name_lbl.setEnabled(n_fields_selected == 1) self.ui.new_field_name_txt.setEnabled(n_fields_selected == 1)
@pyqtSlot(int)
[docs] def on_overwrite_ckb_stateChanged(self): overwrite_checked = self.ui.overwrite_ckb.isChecked() self.ui.new_field_name_lbl.setDisabled(overwrite_checked) self.ui.new_field_name_txt.setDisabled(overwrite_checked) self.ui.track_new_field_ckb.setDisabled(overwrite_checked) if overwrite_checked: self.attr_name_user_def = False self.ui.warning_lbl.show() else: self.ui.warning_lbl.hide() self.update_default_fieldname()
@pyqtSlot()
[docs] def on_calc_btn_clicked(self): self.close() # layer is put in editing mode. If the user clicks on ok, the field # calculator will update the layers attributes. # if the user clicks cancel, the field calculator does nothing. # the layer stays in editing mode with the use_advanced flag set. # the calling code should take care of doing layer.commitChanges() # if the flag is set to true. self.use_advanced = True self.iface.activeLayer().startEditing() self.iface.actionOpenFieldCalculator().trigger()
@pyqtSlot(str)
[docs] def on_algorithm_cbx_currentIndexChanged(self): self.reload_variant_cbx() self.update_default_fieldname()
@pyqtSlot(str)
[docs] def on_variant_cbx_currentIndexChanged(self): self.update_default_fieldname()
@pyqtSlot()
[docs] def on_new_field_name_txt_editingFinished(self): self.attr_name_user_def = True new_field_name = self.ui.new_field_name_txt.text() # if the name of the new field is empty, automatically assign a name if not new_field_name: self.update_default_fieldname()
@pyqtSlot(str)
[docs] def on_new_field_name_txt_textEdited(self): # we assume exactly one item is in the selected list input_field_name = \ self.ui.fields_multiselect.selected_widget.item(0).text() new_field_name = self.ui.new_field_name_txt.text() # if the name of the new field is equal to the name of the input field, # automatically check the 'overwrite' checkbox (and consequently # display the warning) if new_field_name == input_field_name: self.ui.overwrite_ckb.setChecked(True)
[docs] def reload_variant_cbx(self): self.ui.variant_cbx.clear() self.ui.variant_cbx.setEnabled(True) if self.ui.algorithm_cbx.currentText() == 'RANK': self.ui.variant_cbx.addItems(RANK_VARIANTS) elif self.ui.algorithm_cbx.currentText() == 'QUADRATIC': self.ui.variant_cbx.addItems(QUADRATIC_VARIANTS) elif self.ui.algorithm_cbx.currentText() == 'LOG10': self.ui.variant_cbx.addItems(LOG10_VARIANTS) else: self.ui.variant_cbx.setDisabled(True) self.ui.inverse_ckb.setDisabled( self.ui.algorithm_cbx.currentText() in ['LOG10'])
[docs] def update_default_fieldname(self): if self.ui.fields_multiselect.selected_widget.count() != 1: self.ui.new_field_name_txt.setText('') self.attr_name_user_def = False return if (not self.attr_name_user_def or not self.ui.new_field_name_txt.text()): attribute_name = \ self.ui.fields_multiselect.selected_widget.item(0).text() algorithm_name = self.ui.algorithm_cbx.currentText() variant = self.ui.variant_cbx.currentText() inverse = self.ui.inverse_ckb.isChecked() if self.ui.overwrite_ckb.isChecked(): new_attr_name = attribute_name else: new_attr_name = \ ProcessLayer(self.iface.activeLayer()).transform_attribute( attribute_name, algorithm_name, variant, inverse, simulate=True) self.ui.new_field_name_txt.setText(new_attr_name) self.attr_name_user_def = False
[docs] def fill_fields_multiselect(self): field_names = [ field.name() for field in self.iface.activeLayer().dataProvider().fields() if field.typeName() in NUMERIC_FIELD_TYPES] self.ui.fields_multiselect.set_unselected_items(field_names)