def createAndParseSld(qgisLayerItem):
document = QDomDocument()
header = document.createProcessingInstruction(
'xml', 'version=\'1.0\' encoding=\'UTF-8\'')
document.appendChild(header)
root = document.createElementNS('http://www.opengis.net/sld',
'StyledLayerDescriptor')
root.setAttribute('version', '1.0.0')
root.setAttribute('xmlns:ogc', 'http://www.opengis.net/ogc')
root.setAttribute('xmlns:sld', 'http://www.opengis.net/sld')
root.setAttribute('xmlns:gml', 'http://www.opengis.net/gml')
document.appendChild(root)
namedLayerNode = document.createElement('sld:NamedLayer')
root.appendChild(namedLayerNode)
qgisLayerItem.layer.writeSld(namedLayerNode, document, '')
nameNode = namedLayerNode.firstChildElement('se:Name')
oldNameText = nameNode.firstChild()
newname = qgisLayerItem.parentShogunLayer.source['layerNames']
newNameText = document.createTextNode(newname)
nameNode.appendChild(newNameText)
nameNode.removeChild(oldNameText)
userStyleNode = namedLayerNode.firstChildElement('UserStyle')
userStyleNameNode = userStyleNode.firstChildElement('se:Name')
userStyleNameText = userStyleNameNode.firstChild()
userStyleNameNode.removeChild(userStyleNameText)
userStyleNameNode.appendChild(
document.createTextNode(qgisLayerItem.stylename))
titleNode = document.createElement('sld:Title')
title = document.createTextNode('A QGIS-Style for ' +
qgisLayerItem.layer.name())
titleNode.appendChild(title)
userStyleNode.appendChild(titleNode)
defaultNode = document.createElement('sld:IsDefault')
defaultNode.appendChild(document.createTextNode('1'))
userStyleNode.appendChild(defaultNode)
featureTypeStyleNode = userStyleNode.firstChildElement(
'se:FeatureTypeStyle')
featureTypeStyleNameNode = document.createElement('sld:Name')
featureTypeStyleNameNode.appendChild(document.createTextNode('name'))
featureTypeStyleNode.appendChild(featureTypeStyleNameNode)
rules = featureTypeStyleNode.elementsByTagName('se:Rule')
for x in range(rules.length()):
rule = rules.at(x)
rule.removeChild(rule.firstChildElement('se:Description'))
# Check if custom icons are used in symbology and replace the text:
# search if tag 'se:OnlineResource' is in the sld document
listOfGraphics = rule.toElement().elementsByTagName('se:OnlineResource')
if not listOfGraphics.isEmpty():
for x in range(listOfGraphics.length()):
graphicNode = listOfGraphics.at(x)
currentIcon = graphicNode.attributes().namedItem(
'xlink:href').nodeValue()
iconUrl = qgisLayerItem.ressource.prepareIconForUpload(currentIcon)
graphicNode.toElement().setAttribute('xlink:href', iconUrl)
graphicNode.toElement().setAttribute(
'xmlns:xlink', 'http://www.w3.org/1999/xlink')
sld = document.toString()
# in qgis3 layer.writeSld() also incluedes labeling in the output sld,
# whereas in qgis2 we have to do this manually by using this module's function
# getLabelingAsSld
## TODO: The automatic sld labeling from QGIS 3 produces an extra rule for
# every labeling style, thus leading to a less beautiful viewe in the
# shogun2-webapp styler - is this a problem?
if qgisLayerItem.layer.labelsEnabled() and PYTHON_VERSION < 3:
labelSld = getLabelingAsSld(qgisLayerItem.layer)
sld = sld.replace('</se:Rule>', labelSld + '</se:Rule>')
sld = sld.replace('ogc:Filter xmlns:ogc="http://www.opengis.net/ogc"',
'ogc:Filter')
# the following fixes weird problems with the sld compability with the
# shogun webapp
sld = sld.replace('<ogc:And>', '')
sld = sld.replace('</ogc:And>', '')
sld = sld.replace('<se:Name> ', '<se:Name>')
sld = sld.replace(' </se:Name>', '</se:Name>')
sld = sld.replace('StyledLayerDescriptor', 'sld:StyledLayerDescriptor')
sld = sld.replace('UserStyle', 'sld:UserStyle')
sld = sld.replace('se:', 'sld:')
sld = sld.replace('SvgParameter', 'CssParameter')
sld = sld.replace('\n', '')
sld = sld.replace('\t', '')
return sld
def getStyleAsSld(layer, styleName):
if layer.type() == layer.VectorLayer:
document = QDomDocument()
header = document.createProcessingInstruction("xml", "version=\"1.0\"")
document.appendChild(header)
root = document.createElementNS("http://www.opengis.net/sld",
"StyledLayerDescriptor")
root.setAttribute("version", "1.0.0")
root.setAttribute("xmlns:ogc", "http://www.opengis.net/ogc")
root.setAttribute("xmlns:sld", "http://www.opengis.net/sld")
# root.setAttribute("xmlns:xlink", "http://www.w3.org/1999/xlink" )
# root.setAttribute(
# "xmlns:xsi", "http://www.w3.org/2001/XMLSchema-instance" )
document.appendChild(root)
namedLayerNode = document.createElement("sld:NamedLayer")
root.appendChild(namedLayerNode)
nameNode = document.createElement("sld:Name")
featureTypeStyleElem = document.createElement("sld:FeatureTypeStyle")
namedLayerNode.appendChild(nameNode)
nameNode.appendChild(document.createTextNode(styleName))
userNode = document.createElement("sld:UserStyle")
namedLayerNode.appendChild(userNode)
nameElem = document.createElement("sld:Name")
nameElem.appendChild(document.createTextNode(styleName))
userNode.appendChild(nameElem)
titleElem = document.createElement("sld:Title")
titleElem.appendChild(document.createTextNode(styleName))
userNode.appendChild(titleElem)
rule = layer.renderer().rootRule()
props = {} # QgsStringMap() can be see as a python dictionary
rule_to_sld(rule, document, featureTypeStyleElem, props)
userNode.appendChild(featureTypeStyleElem)
return str(document.toString(4))
elif layer.type() == layer.RasterLayer:
renderer = layer.renderer()
if isinstance(renderer, QgsSingleBandGrayRenderer):
symbolizerCode = "<Opacity>%d</Opacity>" % renderer.opacity()
symbolizerCode += (
"<ChannelSelection><GrayChannel><SourceChannelName>" +
str(renderer.grayBand()) +
"</SourceChannelName></GrayChannel></ChannelSelection>")
sld = RASTER_SLD_TEMPLATE.replace("SYMBOLIZER_CODE",
symbolizerCode).replace(
"STYLE_NAME", layer.name())
return sld
elif isinstance(renderer, QgsSingleBandPseudoColorRenderer):
symbolizerCode = "<ColorMap>"
# band = renderer.usesBands()[0]
items = \
renderer.shader().rasterShaderFunction().colorRampItemList()
for item in items:
color = item.color
rgb = '#%02x%02x%02x' % (color.red(), color.green(),
color.blue())
symbolizerCode += ('<ColorMapEntry color="' + rgb +
'" quantity="' + str(item.value) + '" />')
symbolizerCode += "</ColorMap>"
sld = RASTER_SLD_TEMPLATE.replace("SYMBOLIZER_CODE",
symbolizerCode).replace(
"STYLE_NAME", layer.name())
return sld
else:
# we use some default styles in case we have an
# unsupported renderer
sldpath = os.path.join(os.path.dirname(__file__), "..",
"resources")
if layer.bandCount() == 1:
sldfile = os.path.join(sldpath, "grayscale.sld")
else:
sldfile = os.path.join(sldpath, "rgb.sld")
with open(sldfile, 'r', newline='') as f:
sld = f.read()
return sld
else:
return None
