latlngcalc_dialog.py

# -*- coding: utf-8 -*-
"""
/***************************************************************************
 LatlngcalcDialog
                                 A QGIS plugin
 Allows conversion for latitudes and longitudes between decimal degrees and DMS
 Generated by Plugin Builder: http://g-sherman.github.io/Qgis-Plugin-Builder/
                             -------------------
        begin                : 2022-01-18
        git sha              : $Format:%H$
        copyright            : (C) 2022 by Athena Solutions Limited
        email                : contact@josephkariuki.com
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it is 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

from qgis.PyQt import uic
from qgis.PyQt import QtWidgets

# This loads your .ui file so that PyQt can populate your plugin with the elements from Qt Designer
FORM_CLASS, _ = uic.loadUiType(os.path.join(
    os.path.dirname(__file__), 'latlngcalc_dialog_base.ui'))


class LatlngcalcDialog(QtWidgets.QDialog, FORM_CLASS):
    def __init__(self, parent=None):
        """Constructor."""
        super(LatlngcalcDialog, self).__init__(parent)
        # Set up the user interface from Designer through FORM_CLASS.
        # After self.setupUi() you can access any designer object by doing
        # self.<objectname>, and you can use autoconnect slots - see
        # http://qt-project.org/doc/qt-4.8/designer-using-a-ui-file.html
        # #widgets-and-dialogs-with-auto-connect
        self.setupUi(self)
        # Connect signals to slots
        self.spbLatD.valueChanged.connect(self.on_lat_dms_to_dd)
        self.spbLatM.valueChanged.connect(self.on_lat_dms_to_dd)
        self.spbLatS.valueChanged.connect(self.on_lat_dms_to_dd)
        self.comboNS.currentTextChanged.connect(self.on_lat_dms_to_dd)
        self.spbLongD.valueChanged.connect(self.on_long_dms_to_dd)
        self.spbLongM.valueChanged.connect(self.on_long_dms_to_dd)
        self.spbLongS.valueChanged.connect(self.on_long_dms_to_dd)
        self.comboEW.currentTextChanged.connect(self.on_long_dms_to_dd)

        self.spbLatDecDeg.editingFinished.connect(self.on_lat_dd_to_dms)
        self.spbLongDecDeg.editingFinished.connect(self.on_long_dd_to_dms)

    def on_lat_dms_to_dd(self):
        """
        Slot raised to calculate Decimal Minutes and Seconds to Decimal
        Degrees for Latitude.
        """
        i_deg = self.spbLatD.value()
        i_min = self.spbLatM.value()
        d_sec = self.spbLatS.value()
        dec_deg = float(i_deg) + i_min/60 + d_sec/3600
        ns_hemisphere = self.comboNS.currentText()
        self.spbLatDecDeg.setValue(dec_deg)
        if ns_hemisphere == 'South':
            dec_deg *= -1

        self.spbLatDecDeg.setValue(dec_deg)

    def on_long_dms_to_dd(self):
        """
        Slot raised to calculate Decimal Minutes and Seconds to Decimal
        Degrees for Longitude.
        """
        init_deg = self.spbLongD.value()
        init_min = self.spbLongM.value()
        d_sec = self.spbLongS.value()
        dec_deg = float(init_deg) + init_min/60 + d_sec/3600
        ew_hemisphere = self.comboEW.currentText()
        self.spbLongDecDeg.setValue(dec_deg)
        if ew_hemisphere == 'West':
            dec_deg *= -1

        self.spbLongDecDeg.setValue(dec_deg)

    def on_lat_dd_to_dms(self):
        """
        Slot raised to convert Decimal Degrees to Decimal Minutes and
        Seconds (DMS) for Latitude.
        """
        dec_deg = self.spbLatDecDeg.value()
        init_deg = int(dec_deg)
        dec_min = int(dec_deg - init_deg) * 60
        init_min = int(dec_min)
        d_sec = (dec_min - init_min) * 60
        self.spbLatD.setValue(abs(init_deg))
        self.spbLatM.setValue(abs(init_min))
        self.spbLatS.setValue(abs(d_sec))

        if dec_deg < 0:
            self.comboNS.setCurrentText("South")
        else:
            self.comboNS.setCurrentText("North")

    def on_long_dd_to_dms(self):
        """
        Slot raised to convert Decimal Degrees to Decimal Minutes and
        Seconds (DMS) for Longitude.
        """
        dec_deg = self.spbLongDecDeg.value()
        init_deg = int(dec_deg)
        dec_min = int(dec_deg - init_deg) * 60
        init_min = int(dec_min)
        d_sec = (dec_min - init_min) * 60
        self.spbLongD.setValue(abs(init_deg))
        self.spbLongM.setValue(abs(init_min))
        self.spbLongS.setValue(abs(d_sec))

        if dec_deg < 0:
            self.comboEW.setCurrentText("West")
        else:
            self.comboEW.setCurrentText("East")