/
layer.py
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layer.py
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import re
from qgis.core import *
from logger import log
from symbology import *
class vector(object):
"""Base class for the layer abstracting away the QGIS details"""
def __init__(self, iface, layer):
"""Initialise the layer"""
self.__logger = log(self.__class__.__name__)
self.rendererType = 0
self.id = layer.id()
self.name = layer.name()
self.layer = layer
self.filePath = ""
self.main = False
self.extra = iface.legendInterface().isLayerVisible(layer)
self.type = layer.type()
self.fields = []
self.vizFields = []
self.defaultId = ""
self.hasTip = False
self.hasViz = False
self.renderers = renderers()
"""A list of renderers, representing each class in the data range"""
self.averageOutlineWidth = 1
self.isVisible = iface.legendInterface().isLayerVisible(layer)
self.transparency = 1 - (float(layer.layerTransparency()) / 100)
for f in layer.pendingFields():
# Add to the list of fields
self.fields.append(f.name())
# Add numeric fields to the list for visualization
if f.typeName().lower() == "integer" or f.typeName().lower() == "real" or f.typeName().lower() == "integer64":
self.vizFields.append(f.name())
# An ID field? Set the default for the ID field option
upper = f.name().upper()
if upper == "ID" or upper == "OBJECT_ID" or upper == "OBJECTID":
self.defaultId = f.name()
# Now read the symbology for the layer
self.getSymbology(layer)
def setMain(self, state):
"""Set whether the vector layer is the main layer"""
self.main = state
for r in self.renderers:
for s in r.symbols:
s.isMain = state
def setOutputOrder(self, outIndex):
"""Assign the output order of the layer, so that the various CSS and JavaSripts have the right IDs"""
cssstub = self.getLayerObjectName(outIndex)
for i, r in enumerate(self.renderers):
r.setOutputCss(i, u"{0}c{1}".format(cssstub, str(i)))
def getSafeName(self):
"""Return a string condsidered safe for use in file names"""
pattern = re.compile('[\W_]+', re.UNICODE)
return pattern.sub("", self.name)
def getLayerObjectName(self, outIndex):
"""Get a unique layer name as an object within topojson"""
stub = u"l{0}"
return stub.format(str(outIndex))
def getSymbology(self, layer):
"""Read the symbology, generate a CSS style and set against each row in the layers attribute table"""
renderer = layer.rendererV2()
dump = renderer.dump()
if dump[0:6] == "SINGLE":
self.getSingleSymbol(layer, renderer, self.transparency)
elif dump[0:11] == "CATEGORIZED":
self.getCategorizedSymbol(layer, renderer, self.transparency)
elif dump[0:9] == "GRADUATED":
self.getGraduatedSymbol(layer, renderer, self.transparency)
else:
words = dump.split(" ")
self.__logger.error("{0} renderer in {1} not supported".format(words[0], layer.name))
# Unknown type, fall back onto the single renderer
self.getSingleSymbol(layer, renderer, self.transparency)
def getSingleSymbol(self, layer, renderer, transparency):
"""Read the symbology for single symbol layers"""
geoType = layer.geometryType()
self.rendererType = 0
s = singleSymbol(geoType, renderer.symbol(), transparency)
self.renderers.append(s)
def getCategorizedSymbol(self, layer, renderer, transparency):
"""Read the symbology for categorized symbol layers"""
field = renderer.classAttribute()
geoType = layer.geometryType()
self.rendererType = 1
fieldType = "String"
fields = layer.pendingFields()
for f in fields:
if f.name() == field:
fieldType = f.typeName()
break
for c in renderer.categories():
s = categorized(geoType, field, fieldType, c, transparency)
self.renderers.append(s)
def getGraduatedSymbol(self, layer, renderer, transparency):
"""Read the symbology for graduated symbol layers"""
field = renderer.classAttribute()
geoType = layer.geometryType()
self.rendererType = 2
for r in renderer.ranges():
s = graduated(geoType, field, r, transparency)
self.renderers.append(s)
def logData(self):
"""Log the parameters to the log messages panel"""
template = u""" {name}
id = [{id}]
type = [{type}]
renderer = [{renderer}]
extra = [{extra}]
colid = [{colid}]
visible = [{visible}]
trans = [{trans}]"""
self.__logger.info(template.format(
name = self.name,
id = self.id,
type = self.type,
renderer = self.rendererType,
extra = self.extra,
colid = self.defaultId,
visible = self.isVisible,
trans = self.transparency
))
# Now call the symbology logger
self.renderers.logData()
def isSingleRenderer(self):
"""Is this a single renderer type?"""
return self.rendererType == 0