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# -*- coding: utf-8 -*-
"""
***************************************************************************
nviz.py
---------------------
Date : August 2012
Copyright : (C) 2012 by Victor Olaya
Email : volayaf 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. *
* *
***************************************************************************
"""
__author__ = 'Victor Olaya'
__date__ = 'August 2012'
__copyright__ = '(C) 2012, Victor Olaya'
# This will get replaced with a git SHA1 when you do a git archive
__revision__ = '$Format:%H$'
from PyQt4 import QtGui
from qgis.core import *
from processing.core.GeoAlgorithm import GeoAlgorithm
from processing.parameters.ParameterMultipleInput import ParameterMultipleInput
from processing.parameters.ParameterExtent import ParameterExtent
from processing.parameters.ParameterNumber import ParameterNumber
from processing.parameters.ParameterRaster import ParameterRaster
from GrassUtils import GrassUtils
from processing.tools.system import *
from processing.tools import dataobjects
class nviz(GeoAlgorithm):
ELEVATION = 'ELEVATION'
VECTOR = 'VECTOR'
COLOR = 'COLOR'
GRASS_REGION_EXTENT_PARAMETER = 'GRASS_REGION_PARAMETER'
GRASS_REGION_CELLSIZE_PARAMETER = 'GRASS_REGION_CELLSIZE_PARAMETER'
def getIcon(self):
return QtGui.QIcon(os.path.dirname(__file__) + '/../images/grass.png')
def defineCharacteristics(self):
self.name = 'nviz'
self.group = 'Visualization(NVIZ)'
self.addParameter(ParameterMultipleInput(nviz.ELEVATION,
'Raster file(s) for elevation',
ParameterMultipleInput.TYPE_RASTER, True))
self.addParameter(ParameterMultipleInput(nviz.VECTOR, 'Vector lines/areas overlay file(s)',
ParameterMultipleInput.TYPE_VECTOR_ANY, True))
self.addParameter(ParameterMultipleInput(nviz.COLOR, 'Raster file(s) for color',
ParameterMultipleInput.TYPE_RASTER, True))
self.addParameter(ParameterExtent(nviz.GRASS_REGION_EXTENT_PARAMETER,
'GRASS region extent'))
self.addParameter(ParameterNumber(self.GRASS_REGION_CELLSIZE_PARAMETER,
'GRASS region cellsize (leave 0 for default)', 0,
None, 0.0))
def processAlgorithm(self, progress):
commands = []
vector = self.getParameterValue(self.VECTOR)
elevation = self.getParameterValue(self.ELEVATION)
color = self.getParameterValue(self.COLOR)
region = \
str(self.getParameterValue(self.GRASS_REGION_EXTENT_PARAMETER))
regionCoords = region.split(',')
command = 'g.region '
command += 'n=' + str(regionCoords[3])
command += ' s=' + str(regionCoords[2])
command += ' e=' + str(regionCoords[1])
command += ' w=' + str(regionCoords[0])
cellsize = self.getParameterValue(self.GRASS_REGION_CELLSIZE_PARAMETER)
if cellsize:
command += ' res=' + str(cellsize)
else:
command += ' res=' + str(self.getDefaultCellsize())
commands.append(command)
command = 'nviz'
if vector:
layers = vector.split(';')
for layer in layers:
(cmd, newfilename) = self.exportVectorLayer(layer)
commands.append(cmd)
vector = vector.replace(layer, newfilename)
command += ' vector=' + vector.replace(';', ',')
if color:
layers = color.split(';')
for layer in layers:
(cmd, newfilename) = self.exportRasterLayer(layer)
commands.append(cmd)
color = color.replace(layer, newfilename)
command += ' color=' + color.replace(';', ',')
if elevation:
layers = elevation.split(';')
for layer in layers:
(cmd, newfilename) = self.exportRasterLayer(layer)
commands.append(cmd)
elevation = elevation.replace(layer, newfilename)
command += ' elevation=' + elevation.replace(';', ',')
if elevation is None and vector is None:
command += ' -q'
commands.append(command)
GrassUtils.createTempMapset()
GrassUtils.executeGrass(commands, progress)
def getTempFilename(self):
filename = 'tmp' + str(time.time()).replace('.', '') \
+ str(getNumExportedLayers())
return filename
def exportVectorLayer(self, layer):
destFilename = self.getTempFilename()
command = 'v.in.ogr'
command += ' min_area=-1'
command += ' dsn="' + os.path.dirname(layer) + '"'
command += ' layer=' + os.path.basename(layer)[:-4]
command += ' output=' + destFilename
command += ' --overwrite -o'
return (command, destFilename)
def exportRasterLayer(self, layer):
destFilename = self.getTempFilename()
command = 'r.in.gdal'
command += ' input="' + layer + '"'
command += ' band=1'
command += ' out=' + destFilename
command += ' --overwrite -o'
return (command, destFilename)
def getDefaultCellsize(self):
cellsize = 0
for param in self.parameters:
if param.value:
if isinstance(param, ParameterRaster):
if isinstance(param.value, QgsRasterLayer):
layer = param.value
else:
layer = dataobjects.getObjectFromUri(param.value)
cellsize = max(cellsize, (layer.extent().xMaximum()
- layer.extent().xMinimum())
/ layer.width())
elif isinstance(param, ParameterMultipleInput):
layers = param.value.split(';')
for layername in layers:
layer = dataobjects.getObjectFromUri(layername)
if isinstance(layer, QgsRasterLayer):
cellsize = max(cellsize,
(layer.extent().xMaximum()
- layer.extent().xMinimum())
/ layer.width())
if cellsize == 0:
cellsize = 1
return cellsize
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