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utils.py
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utils.py
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# qgis-ol3 Creates OpenLayers map from QGIS layers
# Copyright (C) 2014 Victor Olaya ([email protected])
#
# 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.
#
# This program 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 General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
import os
import re
from PyQt4.QtCore import *
from qgis.core import *
import subprocess
NO_POPUP = 0
ALL_ATTRIBUTES = 1
TYPE_MAP = {
QGis.WKBPoint: 'Point',
QGis.WKBLineString: 'LineString',
QGis.WKBPolygon: 'Polygon',
QGis.WKBPolygon25D: 'Polygon',
QGis.WKBMultiPoint: 'MultiPoint',
QGis.WKBMultiLineString: 'MultiLineString',
QGis.WKBMultiPolygon: 'MultiPolygon',
QGis.WKBMultiPolygon25D: 'MultiPolygon'}
def tempFolder():
tempDir = os.path.join(unicode(QDir.tempPath()), 'qgis2web')
if not QDir(tempDir).exists():
QDir().mkpath(tempDir)
return unicode(os.path.abspath(tempDir))
def getUsedFields(layer):
fields = []
try:
fields.append(layer.rendererV2().classAttribute())
except:
pass
labelsEnabled = str(layer.customProperty("labeling/enabled")).lower() == "true"
if labelsEnabled:
fields.append(layer.customProperty("labeling/fieldName"))
return fields
def exportLayers(layers, folder, precision, optimize, popupField):
epsg3587 = QgsCoordinateReferenceSystem("EPSG:3857")
layersFolder = os.path.join(folder, "layers")
QDir().mkpath(layersFolder)
reducePrecision = re.compile(r"([0-9]+\.[0-9]{%s})([0-9]+)" % str(int(precision)))
for layer, popup in zip(layers, popupField):
if layer.type() == layer.VectorLayer:
usedFields = getUsedFields(layer)
if popup != ALL_ATTRIBUTES:
print layer.wkbType()
uri = TYPE_MAP[layer.wkbType()]
crs = layer.crs()
if crs.isValid():
uri += '?crs=' + crs.authid()
if popup != NO_POPUP:
usedFields.append(popup)
for field in usedFields:
fieldType = layer.pendingFields().field(field).type()
fieldType = "double" if fieldType == QVariant.Double or fieldType == QVariant.Int else "string"
uri += '&field=' + str(field) + ":" + fieldType
newlayer = QgsVectorLayer(uri, layer.name(), 'memory')
writer = newlayer.dataProvider()
outFeat = QgsFeature()
for feature in layer.getFeatures():
outFeat.setGeometry(feature.geometry())
attrs = [feature[f] for f in usedFields]
if attrs:
outFeat.setAttributes(attrs)
writer.addFeatures([outFeat])
layer = newlayer
path = os.path.join(layersFolder, safeName(layer.name()) + ".js")
QgsVectorFileWriter.writeAsVectorFormat(layer, path, "utf-8", epsg3587, 'GeoJson')
with open(path) as f:
lines = f.readlines()
with open(path, "w") as f:
f.write("var %s = " % ("geojson_" + safeName(layer.name())))
for line in lines:
line = reducePrecision.sub(r"\1", line)
if optimize:
line = line.strip("\n\t ")
line = removeSpaces(line)
f.write(line)
elif layer.type() == layer.RasterLayer:
orgFile = layer.source()
destFile = os.path.join(layersFolder, safeName(layer.name()) + ".jpg")
settings = QSettings()
path = unicode(settings.value('/GdalTools/gdalPath', ''))
envval = unicode(os.getenv('PATH'))
if not path.lower() in envval.lower().split(os.pathsep):
envval += '%s%s' % (os.pathsep, path)
os.putenv('PATH', envval)
subprocess.Popen(
['gdal_translate -of JPEG -a_srs EPSG:3857 %s %s' % (orgFile, destFile)],
shell=True,
stdout=subprocess.PIPE,
stdin=subprocess.PIPE,
stderr=subprocess.STDOUT,
universal_newlines=False)
def safeName(name):
# TODO: we are assuming that at least one character is valid...
validChars = '123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
return ''.join(c for c in name if c in validChars)
def removeSpaces(txt):
return '"'.join(it if i % 2 else ''.join(it.split())
for i, it in enumerate(txt.split('"')))
def scaleToZoom(scale):
if scale < 1000:
return 19
elif scale < 2000:
return 18
elif scale < 4000:
return 17
elif scale < 8000:
return 16
elif scale < 15000:
return 15
elif scale < 35000:
return 14
elif scale < 70000:
return 13
elif scale < 150000:
return 12
elif scale < 250000:
return 11
elif scale < 500000:
return 10
elif scale < 1000000:
return 9
elif scale < 2000000:
return 8
elif scale < 4000000:
return 7
elif scale < 10000000:
return 6
elif scale < 15000000:
return 5
elif scale < 35000000:
return 4
elif scale < 70000000:
return 3
elif scale < 150000000:
return 2
elif scale < 250000000:
return 1
else:
return 0