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[processing] fixed ‘create points along lines’ algorithm
fixes #12768
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import os | ||
from PyQt4.QtCore import * | ||
from qgis.core import * | ||
from collections import Iterator | ||
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TYPE_MAP = { | ||
str : QVariant.String, | ||
float: QVariant.Double, | ||
int: QVariant.Int, | ||
bool: QVariant.Bool | ||
} | ||
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GEOM_TYPE_MAP = { | ||
QGis.WKBPoint: 'Point', | ||
QGis.WKBLineString: 'LineString', | ||
QGis.WKBPolygon: 'Polygon', | ||
QGis.WKBMultiPoint: 'MultiPoint', | ||
QGis.WKBMultiLineString: 'MultiLineString', | ||
QGis.WKBMultiPolygon: 'MultiPolygon', | ||
} | ||
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QGSGEOM = "qgs_geom" | ||
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def _toQgsGeometry(geom, geomtype): | ||
def toQgsPoint(p): | ||
if isinstance(p, tuple): | ||
return QgsPoint(p[0], p[1]) | ||
elif isinstance(p, QgsPoint): | ||
return p | ||
else: | ||
return [toQgsPoint(item) for item in p] | ||
if isinstance(geom, QgsGeometry): | ||
return geom | ||
if geomtype == QGis.WKBPoint: | ||
return QgsGeometry.fromPoint(toQgsPoint(geom)) | ||
elif geomtype == QGis.WKBLineString: | ||
return QgsGeometry.fromPolyline(toQgsPoint(geom)) | ||
elif geomtype == QGis.WKBPolygon: | ||
return QgsGeometry.fromPolygon(toQgsPoint(geom)) | ||
else: | ||
pass | ||
#TODO | ||
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class VectorLayer(object): | ||
def __init__(self, layer): | ||
self.layer = layer | ||
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def __getattr__(self, name): | ||
return getattr(self.__dict__['layer'], name) | ||
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def addFeature(self, *args): | ||
if len(args) == 2: | ||
feature = QgsFeature() | ||
feature.setGeometry(_toQgsGeometry(args[0], self.wkbType())) | ||
feature.setAttributes(args[1]) | ||
if len(args) == 1: | ||
if isinstance(args[0], dict): | ||
feature = QgsFeature() | ||
attrs = [args[0].get(f.name(), None) for f in self.layer.dataProvider().fields()] | ||
feature.setAttributes(attrs) | ||
if QGSGEOM in args[0]: | ||
feature.setGeometry[args[0][QGSGEOM]] | ||
elif isinstance(args[0], QgsFeature): | ||
feature = args[0] | ||
self.dataProvider().addFeatures([feature]) | ||
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def addField(self, name, fieldtype, defaultValue = None): | ||
fields = [f.name() for f in self.dataProvider().fields()] | ||
self.dataProvider().addAttributes([_toQgsField((name, fieldtype))]) | ||
self.updateFields() | ||
if defaultValue is not None: | ||
idx = self.dataProvider().fieldNameIndex(name) | ||
for featureIdx, f in enumerate(self.getFeatures()): | ||
if callable(defaultValue): | ||
attrs = {QGSGEOM: Geometry(f.geometry())} | ||
for i, field in enumerate(fields): | ||
attrs[field] = f.attributes()[i] | ||
v = defaultValue(featureIdx, attrs) | ||
else: | ||
v = defaultValue | ||
self.dataProvider().changeAttributeValues({f.id():{idx: v}}) | ||
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def features(self): | ||
class todict(Iterator): | ||
def __init__(self, featureiter, fields): | ||
self.featureiter = featureiter | ||
self.fields = fields | ||
def next(self): | ||
feature = self.featureiter.next() | ||
class geomdict(dict): | ||
def geom(self): | ||
return self[QGSGEOM] | ||
d = geomdict() | ||
d[QGSGEOM] = Geometry(feature.geometry()) | ||
for i, field in enumerate(self.fields): | ||
d[field] = feature.attributes()[i] | ||
return d | ||
fields = [f.name() for f in self.dataProvider().fields()] | ||
return todict(self.getFeatures(), fields) | ||
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TYPE_MAP = { | ||
str : QVariant.String, | ||
float: QVariant.Double, | ||
int: QVariant.Int, | ||
bool: QVariant.Bool | ||
} | ||
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GEOM_TYPE_MAP = { | ||
QGis.WKBPoint: 'Point', | ||
QGis.WKBLineString: 'LineString', | ||
QGis.WKBPolygon: 'Polygon', | ||
QGis.WKBMultiPoint: 'MultiPoint', | ||
QGis.WKBMultiLineString: 'MultiLineString', | ||
QGis.WKBMultiPolygon: 'MultiPolygon', | ||
} | ||
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def _toQgsField(f): | ||
if isinstance(f, QgsField): | ||
return f | ||
return QgsField(f[0], TYPE_MAP.get(f[1], QVariant.String)) | ||
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def _fieldName(f): | ||
if isinstance(f, basestring): | ||
return f | ||
return f.name() | ||
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def newPointsLayer(filename, fields, crs, encoding = "utf-8"): | ||
return newVectorLayer(filename, fields, QGis.WKBPoint, crs, encoding) | ||
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def newLinesLayer(filename, fields, crs, encoding = "utf-8"): | ||
return newVectorLayer(filename, fields, QGis.WKBLine, crs, encoding) | ||
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def newPolygonsLayer(filename, fields, crs, encoding = "utf-8"): | ||
return newVectorLayer(filename, fields, QGis.WKBPolygon, crs, encoding) | ||
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def newVectorLayer(filename, fields, geometryType, crs, encoding = "utf-8"): | ||
if isinstance(crs, basestring): | ||
crs = QgsCoordinateReferenceSystem(crs) | ||
if filename is None: | ||
uri = self.GEOM_TYPE_MAP[geometryType] | ||
if crs.isValid(): | ||
uri += '?crs=' + crs.authid() + '&' | ||
fieldsdesc = ['field=' + f for f in fields] | ||
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fieldsstring = '&'.join(fieldsdesc) | ||
uri += fieldsstring | ||
layer = QgsVectorLayer(uri, "mem_layer", 'memory') | ||
else: | ||
formats = QgsVectorFileWriter.supportedFiltersAndFormats() | ||
OGRCodes = {} | ||
for (key, value) in formats.items(): | ||
extension = unicode(key) | ||
extension = extension[extension.find('*.') + 2:] | ||
extension = extension[:extension.find(' ')] | ||
OGRCodes[extension] = value | ||
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extension = os.path.splitext(filename)[1][1:] | ||
if extension not in OGRCodes: | ||
extension = 'shp' | ||
filename = filename + '.shp' | ||
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qgsfields = QgsFields() | ||
for field in fields: | ||
qgsfields.append(_toQgsField(field)) | ||
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QgsVectorFileWriter(filename, encoding, qgsfields, | ||
geometryType, crs, OGRCodes[extension]) | ||
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layer = QgsVectorLayer(filename, os.path.basename(filename), 'ogr') | ||
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return VectorLayer(layer) | ||
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class Geometry(QgsGeometry): | ||
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def __init__(self, geom): | ||
self.geom = geom | ||
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def __getattr__(self, name): | ||
return getattr(self.__dict__['geom'], name) | ||
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def __iter__(self): | ||
geomType = self.wkbType() | ||
if geomType in [QGis.WKBMultiPolygon, QGis.WKBMultiPolygon25D]: | ||
return self.asMultiPolygon() | ||
elif geomType in [QGis.WKBPolygon, QGis.WKBPolygon25D]: | ||
return self.asPolygon() | ||
elif geomType in [QGis.WKBMultiLineString, QGis.WKBMultiLineString25D]: | ||
return self.asMultiPolyline() | ||
elif geomType in [QGis.WKBLineString, QGis.WKBLineString25D]: | ||
return self.asPolyline() | ||
elif geomType in [QGis.WKBMultiPoint, QGis.WKBMultiPoint25D]: | ||
return self.asMultiPoint() | ||
elif geomType in [QGis.WKBPoint, QGis.WKBPoint25D]: | ||
return self.asPoint() | ||
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def next(self): | ||
return | ||
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def layerFromName(name): | ||
layers = QgsMapLayerRegistry.instance().mapLayers().values() | ||
for layer in layers: | ||
if layer.name() == name: | ||
return VectorLayer(layer) | ||
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def loadLayer(filename): | ||
name = os.path.split(filename)[1] | ||
qgslayer = QgsVectorLayer(filename, name, 'ogr') | ||
if not qgslayer.isValid(): | ||
qgslayer = QgsRasterLayer(filename, name) | ||
if not qgslayer.isValid(): | ||
raise RuntimeError('Could not load layer: ' + unicode(filename)) | ||
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return VectorLayer(qgslayer) | ||
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