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transformation_dialog.py
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transformation_dialog.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
.. module:: transformation_dialog
:platform: Linux, Windows
:synopsis: GUI for coordinate transformation
.. moduleauthor::Zoltan Siki <siki@agt.bme.hu>
"""
import platform
import webbrowser
from PyQt4.QtGui import QDialog, QFileDialog, QFont, QMessageBox
from PyQt4.QtCore import SIGNAL, QCoreApplication, QSettings
import config
from transformation_calc import Ui_TransformationCalcDialog
from base_classes import *
from surveying_util import *
from calculation import *
class TransformationDialog(QDialog):
""" Class for transformation calculation dialog
"""
def __init__(self, log):
""" Initialize dialog data and event handlers
"""
super(TransformationDialog, self).__init__()
self.ui = Ui_TransformationCalcDialog()
self.ui.setupUi(self)
self.log = log
self.from_points = []
self.common = []
self.used = []
self.ui.CloseButton.clicked.connect(self.onCloseButton)
self.ui.ResetButton.clicked.connect(self.onResetButton)
self.ui.ToFileButton.clicked.connect(self.onToFileButton)
self.ui.AddButton.clicked.connect(self.onAddButton)
self.ui.RemoveButton.clicked.connect(self.onRemoveButton)
self.ui.CalcButton.clicked.connect(self.onCalcButton)
self.ui.HelpButton.clicked.connect(self.onHelpButton)
# coordinate list changed
self.connect(self.ui.FromLayerComboBox, SIGNAL("currentIndexChanged(const QString&)"), self.fill_common)
def showEvent(self, event):
""" set up initial state of dialog
:param event: NOT USED
"""
if platform.system() == 'Linux':
# change font
fontname = QSettings().value("SurveyingCalculation/fontname",config.fontname)
fontsize = int(QSettings().value("SurveyingCalculation/fontsize",config.fontsize))
self.ui.ResultTextBrowser.setFont(QFont(fontname, fontsize))
log_path = QSettings().value("SurveyingCalculation/log_path",config.log_path)
self.log.set_log_path(log_path)
self.reset()
def reset(self):
""" Reset dialog to initial state
"""
# fill from list
self.ui.FromLayerComboBox.clear()
clist = get_coordlist()
if clist is not None:
self.ui.FromLayerComboBox.addItems(clist)
# clear to file
self.ui.ToShapeEdit.setText('')
# clear comon & used list
self.ui.CommonList.clear()
self.ui.UsedList.clear()
# select orthogonal transformation
self.ui.OrthogonalRadio.setChecked(False)
self.ui.AffineRadio.setChecked(False)
self.ui.ThirdRadio.setChecked(False)
self.ui.FourthRadio.setChecked(False)
self.ui.FifthRadio.setChecked(False)
self.ui.OrthogonalRadio.setEnabled(False)
self.ui.AffineRadio.setEnabled(False)
self.ui.ThirdRadio.setEnabled(False)
self.ui.FourthRadio.setEnabled(False)
self.ui.FifthRadio.setEnabled(False)
self.ui.ResultTextBrowser.clear()
def onCloseButton(self):
""" Close dialog after Close button pressed
"""
self.accept()
def onResetButton(self):
""" Reset dialog to initial state after Reset button pressed
"""
self.reset()
def onToFileButton(self):
""" Select target shape file
"""
fname = QFileDialog.getOpenFileName(None, tr('Coordinate list'),
filter= tr('Coordinate list file (*.shp);;'))
if fname:
self.ui.ToShapeEdit.setText(fname)
if len(self.ui.FromLayerComboBox.currentText()):
# fill common list
self.fill_common()
else:
self.ui.ToShapeEdit.setText('')
# clear comon & used list
self.ui.CommonList.clear()
self.ui.UsedList.clear()
def onAddButton(self):
""" Add selected points to used points in transformation
"""
selected = self.ui.CommonList.selectedItems()
for item in selected:
i = self.ui.CommonList.row(item)
self.ui.UsedList.addItem(self.ui.CommonList.takeItem(i))
self.used.append(self.common[i])
del self.common[i]
if len(self.used) > 1:
self.ui.OrthogonalRadio.setEnabled(True)
if len(self.used) > 2:
self.ui.AffineRadio.setEnabled(True)
if len(self.used) > 9:
self.ui.ThirdRadio.setEnabled(True)
if len(self.used) > 14:
self.ui.FourthRadio.setEnabled(True)
if len(self.used) > 20:
self.ui.FifthRadio.setEnabled(True)
def onRemoveButton(self):
""" Remove selected points from used points
"""
selected = self.ui.UsedList.selectedItems()
for item in selected:
i = self.ui.UsedList.row(item)
self.ui.CommonList.addItem(self.ui.UsedList.takeItem(i))
self.common.append(self.used[i])
del self.used[i]
if len(self.used) < 2:
self.ui.OrthogonalRadio.setEnabled(False)
if len(self.used) < 3:
self.ui.AffineRadio.setEnabled(False)
if len(self.used) < 10:
self.ui.ThirdRadio.setEnabled(False)
if len(self.used) < 15:
self.ui.FourthRadio.setEnabled(False)
if len(self.used) < 21:
self.ui.FifthRadio.setEnabled(False)
def fill_common(self):
""" Find common points in coordinate lists
"""
self.ui.UsedList.clear()
self.ui.CommonList.clear()
from_name = self.ui.FromLayerComboBox.currentText()
to_name = self.ui.ToShapeEdit.text()
if len(from_name) == 0 or len(to_name) == 0:
return
to_shp = QgsVectorLayer(to_name, "tmp_to_shape", "ogr")
QgsMapLayerRegistry.instance().addMapLayer(to_shp, False)
to_points = get_known(2, "tmp_to_shape")
QgsMapLayerRegistry.instance().removeMapLayer("tmp_to_shape")
self.from_points = get_known(2, from_name)
self.common = []
self.used = []
if self.from_points is None:
QMessageBox.warning(self, tr("Warning"), \
tr("No points with coordinates in source coordinate list"))
elif to_points is None:
QMessageBox.warning(self, tr("Warning"),\
tr("No points with coordinates in target coordinate list"))
else:
for from_p in self.from_points:
if from_p in to_points:
self.common.append(from_p)
for p in self.common:
self.ui.CommonList.addItem(p)
if len(self.common) == 0:
QMessageBox.warning(self, tr("Warning"),\
tr("No common points in coordinate lists"))
def onCalcButton(self):
""" Start transformation calculation
"""
from_list = self.ui.FromLayerComboBox.currentText()
if len(from_list) == 0:
QMessageBox.warning(self, tr("Warning"), tr("Select from layer!"))
return
to_list = 'tmp_to_shape'
p_list = []
to_name = self.ui.ToShapeEdit.text()
if len(to_name) == 0:
QMessageBox.warning(self, tr("Warning"), tr("Select to shape file!"))
return
to_shp = QgsVectorLayer(to_name, "tmp_to_shape", "ogr")
QgsMapLayerRegistry.instance().addMapLayer(to_shp, False)
for point_id in self.used:
# get coords of points
p_from = get_coord(point_id, from_list)
p_to = get_coord(point_id, to_list)
p_list.append([p_from, p_to])
w = ''
if self.ui.OrthogonalRadio.isChecked():
tr_res = Calculation.orthogonal_transformation(p_list)
tr_func = self.ortho_tr
w = tr('\nOrthogonal transformation')
elif self.ui.AffineRadio.isChecked():
tr_res = Calculation.affine_transformation(p_list)
tr_func = self.affine_tr
w = tr('\nAffine transformation')
elif self.ui.ThirdRadio.isChecked():
tr_res = Calculation.polynomial_transformation(p_list, 3)
tr_func = self.poly3_tr
w = tr('\n3rd order polynomial transformation')
elif self.ui.FourthRadio.isChecked():
tr_res = Calculation.polynomial_transformation(p_list, 4)
tr_func = self.poly4_tr
w = tr('\n4th order polynomial transformation')
elif self.ui.FifthRadio.isChecked():
tr_res = Calculation.polynomial_transformation(p_list, 5)
tr_func = self.poly5_tr
w = tr('\n5th order polynomial transformation')
else:
QMessageBox.warning(self, tr("Warning"), tr("Select transformation type!"))
return
self.ui.ResultTextBrowser.append(w)
self.log.write()
self.log.write_log(w)
# calculate transformed coordinates
w = tr('Point num E from N from E to N to dE dN')
self.ui.ResultTextBrowser.append(w)
self.log.write(w)
for (p_from, p_to) in p_list:
(e, n) = tr_func(p_from, tr_res)
de = p_to.e - e
dn = p_to.n - n
buf = '%-20s ' % p_from.id + \
'%12.3f ' % p_from.e + '%12.3f ' % p_from.n + \
'%12.3f ' % p_to.e + '%12.3f ' % p_to.n + \
'%6.3f ' % de + '%6.3f ' % dn
self.ui.ResultTextBrowser.append(buf)
self.log.write(buf)
# transform and store new points
for p_num in self.from_points:
if not p_num in self.used and not p_num in self.common:
p = get_coord(p_num, from_list)
(e, n) = tr_func(p, tr_res)
buf = '%-20s ' % p.id + \
'%12.3f ' % p.e + '%12.3f ' % p.n + \
'%12.3f ' % e + '%12.3f ' % n
self.ui.ResultTextBrowser.append(buf)
self.log.write(buf)
pp = Point(p_num, e, n, pc='transformed')
ScPoint(pp).store_coord(2, "tmp_to_shape")
QgsMapLayerRegistry.instance().removeMapLayer("tmp_to_shape")
def ortho_tr(self, p, tr):
""" Calculate orthogonal transformation for a point
:param p: point to transform (Point)
:param tr: transformation parameters
:returns: list of easting and northin of transformed coordinates
"""
e = tr[0] + tr[2] * p.e - tr[3] * p.n
n = tr[1] + tr[3] * p.e + tr[2] * p.n
return (e, n)
def affine_tr(self, p, tr):
""" Calculate affine transformation for a point
:param p: point to transform (Point)
:param tr: transformation parameters
:returns: list of easting and northin of transformed coordinates
"""
e = tr[0] + tr[2] * p.e + tr[3] * p.n
n = tr[1] + tr[4] * p.e + tr[5] * p.n
return (e, n)
def poly_tr(self, p, tr, degree):
""" Calculate nth order polynomial transformation for a point
:param p: point to transform (Point)
:param tr: transformation parameters
:param degree: degree of transformation
:returns: list of easting and northin of transformed coordinates
"""
de = p.e - tr[2][0]
dn = p.n - tr[2][1]
l = 0
e = tr[2][2]
n = tr[2][3]
for j in range(0,degree+1):
for k in range(0,degree+1):
if j + k <= degree:
e += tr[0][l] * math.pow(de,k) * math.pow(dn,j)
n += tr[1][l] * math.pow(de,k) * math.pow(dn,j)
l += 1
return (e, n)
def poly3_tr(self, p, tr):
""" Calculate 3rd order polynomial transformation for a point
:param p: point to transform (Point)
:param tr: transformation parameters (list of lists)
:returns: list of easting and northing of transformed coordinates
"""
(e, n) = self.poly_tr(p, tr, 3)
return (e, n)
def poly4_tr(self, p, tr):
""" Calculate 4th order polynomial transformation for a point
:param p: point to transform (Point)
:param tr: transformation parameters
:returns: list of easting and northin of transformed coordinates
"""
return self.poly_tr(p, tr, 4)
def poly5_tr(self, p, tr):
""" Calculate 5th order polynomial transformation for a point
:param p: point to transform (Point)
:param tr: transformation parameters
:returns: list of easting and northin of transformed coordinates
"""
return self.poly_tr(p, tr, 5)
def onHelpButton(self):
""" Open user's guide at Coordinate Transformation in the default web browser.
"""
webbrowser.open("http://www.digikom.hu/SurveyingCalculation/usersguide.html#coordinate-transformation")