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prism_map_time_dialog.py
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prism_map_time_dialog.py
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# -*- coding: utf-8 -*-
"""
/***************************************************************************
PrismMapTimeDialog
A QGIS plugin
CZML Generator
-------------------
begin : 2016-01-06
git sha : $Format:%H$
copyright : (C) 2016 by Gede Mátyás
email : saman@map.elte.hu
***************************************************************************/
/***************************************************************************
* *
* 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. *
* *
***************************************************************************/
A dialog for creating prism mapswith temporal animation
"""
from PyQt5 import QtWidgets, QtGui, uic
from PyQt5.QtWidgets import QMessageBox, QFileDialog, QTableWidgetItem
from qgis.core import QgsCoordinateReferenceSystem, QgsCoordinateTransform, QgsProject, Qgis, QgsWkbTypes
import os
import codecs
import math
import qgis
import sys
sys.modules['qgscolorbutton']=qgis.gui # a workaround to make setupUi know QGSColorButton
FORM_CLASS, _ = uic.loadUiType(os.path.join(
os.path.dirname(__file__), 'prism_map_time.ui'))
class PrismMapTimeDialog(QtWidgets.QDialog, FORM_CLASS):
def __init__(self, parent=None):
"""Constructor."""
super(PrismMapTimeDialog, self).__init__(parent)
self.setupUi(self)
# event handlers
self.pbOK.clicked.connect(self.confirmOK) # OK Button
self.pbCancel.clicked.connect(self.reject) # Cancel button
self.pbBrowse.clicked.connect(self.browseFile) # open file dialog on clicking the browse button
self.layerList.currentIndexChanged.connect(self.getAttrList) # get attribute list when a layer is selected
self.pbAdd.clicked.connect(self.addAttr) # Add button
self.pbRemove.clicked.connect(self.removeAttr) # Remove button
self.twTimesAttrs.itemSelectionChanged.connect(self.enableDisableRemove) # Enable/disable remove button
self.rbLin.toggled.connect(self.showMinMax) # update min/max when scale type is changed
self.rbSqrt.toggled.connect(self.showMinMax) # update min/max when scale type is changed
self.rbLog.toggled.connect(self.showMinMax) # update min/max when scale type is changed
self.scaleFactor.textEdited.connect(self.showMinMax) # update min/max when scale factor is changed
self.pbLegendSettings.clicked.connect(self.legendSettings) # Legend settings button
def browseFile(self):
"""Opens a file save as dialog to get the file name"""
fn,_=QFileDialog.getSaveFileName(self,"Save file as...","","CZML flies (*.czml)")
if (fn!=""):
self.leFileName.setText(fn)
def confirmOK(self):
"""Checks if a filename was specified before accepting the dialog"""
if (self.leFileName.text()==''):
QMessageBox.warning(self,"Warning","You must specify a filename!")
else:
self.accept()
def getAttrList(self):
"""Loads the attribute names of the selected layer into attrList and strAttrList comboboxes"""
# find layer by chosen name
name=self.layerList.currentText()
layers = [tree_layer.layer() for tree_layer in QgsProject.instance().layerTreeRoot().findLayers()]
alayer=None
for layer in layers:
if (layer.name()==name):
alayer=layer
break
if alayer==None:
return
# get attr list
al=[]
self.strAttrList.clear()
for fld in alayer.fields():
if (fld.typeName() in ['Integer','Real']): # TODO: add other numeric types
al.append(fld.name()) # a mappable attribute if numeric
elif (fld.typeName()=='String'):
self.strAttrList.addItem(fld.name()) # an attribute can be used as name if it is a string
# dictionaries for min/max attribute values
self.amin={}
self.amax={}
# get and min/max attribute values
for i,f in enumerate(alayer.getFeatures()):
for a in al:
if (f[a]):
if (not a in self.amin): # when it is the first feature, simply set the min/max valuse for the attrs
self.amin[a]=f[a]
self.amax[a]=f[a]
else: # otherwise change min/max if neccessary
if (f[a]<self.amin[a]):
self.amin[a]=f[a]
if (f[a]>self.amax[a]):
self.amax[a]=f[a]
# set attr list
self.attrList.clear()
self.attrList.addItems(al)
def showMinMax(self):
"""Displays the min/max values for the chosen attribute set"""
# if nothing is selected, empty the text field and return
if self.twTimesAttrs.rowCount()==0:
self.lblRange.setText('')
return
# iterate over selected attributes and find absolute min and max
self.minV=None
self.maxV=None
for row in range(self.twTimesAttrs.rowCount()):
aName=self.twTimesAttrs.item(row,1).text()
if self.minV==None or self.minV>self.amin[aName]:
self.minV=self.amin[aName]
if self.maxV==None or self.maxV<self.amax[aName]:
self.maxV=self.amax[aName]
# min/max values using currently selected scale function and factor
if (self.rbLin.isChecked()):
mn=self.minV
mx=self.maxV
elif (self.rbSqrt.isChecked()):
if (self.minV<0 or self.maxV<0):
# use sqrt only for non-negative values
QMessageBox.warning(self,"Warning","Square root is not applicable for negative values!")
self.rbLin.toggle()
return
mn=math.sqrt(self.minV)
mx=math.sqrt(self.maxV)
else:
if (self.minV<=0 or self.maxV<=0):
# use log only for positive values
QMessageBox.warning(self,"Warning","Logarithm is not applicable for non-positive values!")
self.rbLin.toggle()
return
mn=math.log(self.minV)
mx=math.log(self.maxV)
# failsafe string-float conversion
try:
sf=float(self.scaleFactor.text())
except ValueError:
sf=0
# modify min/max by scale
#print self.minV
#print self.maxV==None
mn=mn*sf
mx=mx*sf
self.sf=sf
self.lblRange.setText(str(mn)+" - "+str(mx))
def addAttr(self):
"""Add selected attribute and time to time/attribute list"""
# current attr name
aname=self.attrList.currentText()
if (aname==""):
return
time=self.dteTime.dateTime().toString(1)+"Z" # ISO datetime
# add new row
row=self.twTimesAttrs.rowCount()+1
self.twTimesAttrs.setRowCount(row)
# put datetime and attribute name to table
self.twTimesAttrs.setItem(row-1,0,QTableWidgetItem(time,0))
self.twTimesAttrs.setItem(row-1,1,QTableWidgetItem(aname,0))
self.twTimesAttrs.sortItems(0);
# update min/max information
self.showMinMax()
def enableDisableRemove(self):
"""Enable/disable remove button"""
# Remove button is enabled if there is something selected
self.pbRemove.setEnabled(len(self.twTimesAttrs.selectedItems())>0)
def removeAttr(self):
"""Add selected attribute and time to time/attribute list"""
# remove selected row
self.twTimesAttrs.removeRow(self.twTimesAttrs.selectedItems()[0].row())
# disable remove button
self.pbRemove.setEnabled(False)
# update min/max information
self.showMinMax()
def legendSettings(self):
"""Opens legend settings dialog"""
# check if we can already create legend
if self.twTimesAttrs.rowCount()==0:
QMessageBox.warning(self,"Warning","You have to add attributes to display first.")
return
# dictionary with settings
ls={}
ls['minV']=self.minV
ls['maxV']=self.maxV
ls['minColor']=self.cb1.color()
ls['maxColor']=self.cb2.color()
ls['attrName']=self.leLegendAttrName.text()
ls['samples']=self.legendSamples
l=self.RLDlg.runThis(ls)
if l!=None:
self.legendSamples=l
def runThis(self,iface):
"""This is called when user clicks on "CZML Prism Map"
: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
"""
# store iface
self.iface=iface
# clear lists
self.layerList.clear()
self.twTimesAttrs.clear()
self.twTimesAttrs.setRowCount(0)
# place to store legend settings
self.legendSamples=None
# collect currently loaded polygon layers to "layerList" comboBox
#layers=iface.legendInterface().layers()
layers = [tree_layer.layer() for tree_layer in QgsProject.instance().layerTreeRoot().findLayers()]
ll=[]
for layer in layers:
if (layer.type()==layer.VectorLayer and layer.geometryType()==QgsWkbTypes.PolygonGeometry):
ll.append(layer.name())
self.layerList.addItems(ll)
# die if no suitable layers found
if (len(ll)==0):
QMessageBox.warning(self,"Error","No suitable layers found.")
return
# show dialog
self.show()
if self.exec_():
# OK clicked, let's create the CZML file
# get filename
filename=self.leFileName.text()
# set html legend filename
htmlFn=filename+".legend.html"
# find layer by chosen name
name=self.layerList.currentText()
for layer in layers:
if (layer.name()==name):
alayer=layer
break
# get chosen attribute name
aName=self.attrList.currentText()
# create projection transformer object
crsDest = QgsCoordinateReferenceSystem(4326) # WGS 84
crsSrc = alayer.crs()
xform = QgsCoordinateTransform(crsSrc, crsDest, QgsProject.instance())
# get colors
c1=self.cb1.color()
c2=self.cb2.color()
R1=c1.red()
G1=c1.green()
B1=c1.blue()
A1=c1.alpha()
dR=c2.red()-R1
dG=c2.green()-G1
dB=c2.blue()-B1
dA=c2.alpha()-A1
# find minimum/maximum time and attribute value
self.minT=None
self.maxT=None
usedAttrs=[]
for row in range(self.twTimesAttrs.rowCount()):
t=self.twTimesAttrs.item(row,0).text()
usedAttrs.append(self.twTimesAttrs.item(row,1).text())
if self.minT==None or self.minT>t:
self.minT=t
if self.maxT==None or self.maxT<t:
self.maxT=t
self.minV=None
self.maxV=None
for aName in usedAttrs:
if self.minV==None or self.minV>self.amin[aName]:
self.minV=self.amin[aName]
if self.maxV==None or self.maxV<self.amax[aName]:
self.maxV=self.amax[aName]
# open output file
ofile=codecs.open(filename,'w','utf-8')
# leading [ and document packet
ofile.write('[\n{"id":"document","version":"1.0"}')
# iterate over feaures
polyN=0
for f in alayer.getFeatures():
# calculate animated values (height, color)
heights=[]
colors=[]
for row in range(self.twTimesAttrs.rowCount()):
aTime=self.twTimesAttrs.item(row,0).text()
aName=self.twTimesAttrs.item(row,1).text()
# calculate height
value=f[aName]
if (not value):
value=0
if (self.rbLin.isChecked()):
h=value
elif (self.rbSqrt.isChecked()):
h=math.sqrt(value)
else:
h=math.log(value)
h=h*self.sf
heights.append('"'+aTime+'",'+str(h))
# calculate color
rh=1.0*(value-self.minV)/(self.maxV-self.minV)
R=R1+dR*rh
G=G1+dG*rh
B=B1+dB*rh
A=A1+dA*rh
rgba=str(R)+','+str(G)+','+str(B)+','+str(A)
colors.append('"'+aTime+'",'+rgba)
# polygon/multipolygon?
if len(f.geometry().asMultiPolygon())>0:
mpg=f.geometry().asMultiPolygon()
else:
mpg=[f.geometry().asPolygon()]
for pg in mpg:
coords=""
# iterate over rings of the polygon
for ring in pg:
for p in ring:
p1=xform.transform(p)
if (coords!=""):
coords=coords+","
coords=coords+'\n\t\t\t\t'+str(p1.x())+","+str(p1.y())+",0"
# add element name if checked
if (self.cbAddName.isChecked()):
nameString=',\n\t"name":"'+f[self.strAttrList.currentText()]+'"'
else:
nameString=''
packetString='{\n\t"id":"poly'+str(polyN)+'"'+nameString+',"availability":"'+self.minT+'/'+self.maxT+'",\n\t"polygon":{\n\t\t"material":{"solidColor":{"color":{"rgba":['+(','.join(colors))+']}}},\n\t\t"positions":{\n\t\t\t"cartographicDegrees":['+coords+']},\n\t\t"extrudedHeight":{"number":['+(','.join(heights))+']}}}'
ofile.write(",\n"+packetString);
polyN=polyN+1
# trailing ] and close flie
ofile.write('\n]')
ofile.close()
# create legend if checked
if (self.cbCreateLegend.isChecked()):
# open html legend file
hfile=codecs.open(htmlFn,'w','utf-8')
hfile.write('<style>\n.czmlLegendSample { width: 40px; height: 20px; border-radius:3px; border: solid thin black; display: inline-block; }\n')
hfile.write('h3.czmlLegend { margin:0; padding-bottom:10px; }\n')
if self.legendSamples!=None:
# we have custom settings for legend
for i in range(len(self.legendSamples)):
rv=(self.legendSamples[i]-self.minV)/(self.maxV-self.minV)
R=int(R1+dR*rv)
G=int(G1+dG*rv)
B=int(B1+dB*rv)
hfile.write('.czmlLegendSample'+str(i)+' { background: rgb('+str(R)+','+str(G)+','+str(B)+'); }\n')
else:
for i in range(4):
R=int(R1+dR*i/3.0)
G=int(G1+dG*i/3.0)
B=int(B1+dB*i/3.0)
hfile.write('.czmlLegendSample'+str(i)+' { background: rgb('+str(R)+','+str(G)+','+str(B)+'); }\n')
hfile.write('</style>\n<h3 class="czmlLegend">'+self.leLegendAttrName.text()+'</h3>')
if self.legendSamples!=None:
# we have custom settings for legend
for i in range(len(self.legendSamples)):
value=self.legendSamples[i]
hfile.write('<span class="czmlLegendSample czmlLegendSample'+str(i)+'"></span> '+str(value)+'<br/>')
else:
for i in range(4):
value=int(self.amin[aName]+(self.amax[aName]-self.amin[aName])*i/3.0)
hfile.write('<span class="czmlLegendSample czmlLegendSample'+str(i)+'"></span> '+str(value)+'<br/>')
hfile.close()
# farewell message
msg="CZML file ("+filename+")"
if (self.cbCreateLegend.isChecked()):
msg=msg+" and legend ("+htmlFn+")"
msg=msg+" successfully created."
QMessageBox.information(self,"Information",msg)