本文整理汇总了Python中qgis.core.QgsGeometry.fromMultiPolygonXY方法的典型用法代码示例。如果您正苦于以下问题：Python QgsGeometry.fromMultiPolygonXY方法的具体用法？Python QgsGeometry.fromMultiPolygonXY怎么用？Python QgsGeometry.fromMultiPolygonXY使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类qgis.core.QgsGeometry的用法示例。
在下文中一共展示了QgsGeometry.fromMultiPolygonXY方法的6个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: processAlgorithm
# 需要导入模块: from qgis.core import QgsGeometry [as 别名]
# 或者: from qgis.core.QgsGeometry import fromMultiPolygonXY [as 别名]
def processAlgorithm(self, parameters, context, feedback):
source = self.parameterAsSource(parameters, self.POLYGONS, context)
parts = self.parameterAsInt(parameters, self.PARTS, context)
fields = source.fields()
(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
source.fields(), source.wkbType(), source.sourceCrs())
features = source.getFeatures()
total = 100.0 / source.featureCount() if source.featureCount() else 0
for current, feat in enumerate(features):
if feedback.isCanceled():
break
geom = feat.geometry()
if geom.isMultipart():
out_feature = feat
geoms = geom.asGeometryCollection()
geom_area = [(i, geoms[i].area()) for i in range(len(geoms))]
geom_area.sort(key=itemgetter(1))
if parts == 1:
out_feature.setGeometry(geoms[geom_area[-1][0]])
elif parts > len(geoms):
out_feature.setGeometry(geom)
else:
out_feature.setGeometry(geom)
geomres = [geoms[i].asPolygon() for i, a in geom_area[-1 * parts:]]
out_feature.setGeometry(QgsGeometry.fromMultiPolygonXY(geomres))
sink.addFeature(out_feature, QgsFeatureSink.FastInsert)
else:
sink.addFeature(feat, QgsFeatureSink.FastInsert)
feedback.setProgress(int(current * total))
return {self.OUTPUT: dest_id}示例2: testQgsMultipolygonRepr
# 需要导入模块: from qgis.core import QgsGeometry [as 别名]
# 或者: from qgis.core.QgsGeometry import fromMultiPolygonXY [as 别名]
def testQgsMultipolygonRepr(self):
mp = QgsGeometry.fromMultiPolygonXY([
[[QgsPointXY(1, 1),
QgsPointXY(2, 2),
QgsPointXY(1, 2),
QgsPointXY(1, 1)]],
[[QgsPointXY(2, 2),
QgsPointXY(3, 3),
QgsPointXY(3, 1),
QgsPointXY(2, 2)]]
])
self.assertEqual(mp.constGet().__repr__(), '<QgsMultiPolygon: MultiPolygon (((1 1, 2 2, 1 2, 1 1)),((2 2, 3 3, 3 1, 2 2)))>')示例3: testMeasureMultiPolygon
# 需要导入模块: from qgis.core import QgsGeometry [as 别名]
# 或者: from qgis.core.QgsGeometry import fromMultiPolygonXY [as 别名]
def testMeasureMultiPolygon(self):
# +-+-+ +-+-+
# | | | |
# + +-+ +-+ +
# | | | |
# +-+ +-+
polygon = QgsGeometry.fromMultiPolygonXY(
[
[[QgsPointXY(0, 0), QgsPointXY(1, 0), QgsPointXY(1, 1), QgsPointXY(2, 1), QgsPointXY(2, 2), QgsPointXY(0, 2), QgsPointXY(0, 0), ]],
[[QgsPointXY(4, 0), QgsPointXY(5, 0), QgsPointXY(5, 2), QgsPointXY(3, 2), QgsPointXY(3, 1), QgsPointXY(4, 1), QgsPointXY(4, 0), ]]
]
)
da = QgsDistanceArea()
area = da.measureArea(polygon)
assert area == 6, 'Expected:\n%f\nGot:\n%f\n' % (6, area)
perimeter = da.measurePerimeter(polygon)
assert perimeter == 16, "Expected:\n%f\nGot:\n%f\n" % (16, perimeter)示例4: _swap_qgs_geometry
# 需要导入模块: from qgis.core import QgsGeometry [as 别名]
# 或者: from qgis.core.QgsGeometry import fromMultiPolygonXY [as 别名]
def _swap_qgs_geometry(qgsgeom):
if qgsgeom.wkbType() == QgsWkbTypes.Point:
p = qgsgeom.asPoint()
qgsgeom = QgsGeometry.fromPointXY(QgsPointXY(p[1], p[0]))
elif qgsgeom.wkbType() == QgsWkbTypes.MultiPoint:
mp = qgsgeom.asMultiPoint()
qgsgeom = QgsGeometry.fromMultiPointXY([QgsPointXY(p[1], p[0]) for p in mp])
elif qgsgeom.wkbType() == QgsWkbTypes.LineString:
pl = qgsgeom.asPolyline()
qgsgeom = QgsGeometry.fromPolylineXY([QgsPointXY(p[1],p[0]) for p in pl])
elif qgsgeom.wkbType() == QgsWkbTypes.MultiLineString:
mls = qgsgeom.asMultiPolyline()
qgsgeom = QgsGeometry.fromMultiPolylineXY([[QgsPointXY(p[1],p[0]) for p in pl] for pl in mls])
elif qgsgeom.wkbType() == QgsWkbTypes.Polygon:
pl = qgsgeom.asPolygon()
qgsgeom = QgsGeometry.fromPolygonXY([[QgsPointXY(p[1],p[0]) for p in r] for r in pl])
elif qgsgeom.wkbType() == QgsWkbTypes.MultiPolygon:
mp = qgsgeom.asMultiPolygon()
qgsgeom = QgsGeometry.fromMultiPolygonXY([[[QgsPointXY(p[1],p[0]) for p in r] for r in pl] for pl in mp])
return qgsgeom示例5: buildQgsMultipolygon
# 需要导入模块: from qgis.core import QgsGeometry [as 别名]
# 或者: from qgis.core.QgsGeometry import fromMultiPolygonXY [as 别名]
def buildQgsMultipolygon(self,polygon):
'''
Construct QgsMultiPolygon from matplotlib version
'''
mpoly=[]
invalid=0
for path in polygon.get_paths():
path.should_simplify = False
poly = path.to_polygons()
if len(poly) < 1:
continue
if len(poly[0]) < 3:
# Have had one vertix polygon from matplotlib!
continue
polypts=[[QgsPointXY(x,y) for x,y in p]
for p in poly if len(p) > 3 ]
mpoly.append(polypts)
geom = None
if len(mpoly) > 0:
geom=QgsGeometry.fromMultiPolygonXY(mpoly)
geom=geom.makeValid()
return geom示例6: enumerate
# 需要导入模块: from qgis.core import QgsGeometry [as 别名]
# 或者: from qgis.core.QgsGeometry import fromMultiPolygonXY [as 别名]
feedback.pushInfo("'To keep' value has been modified to be at least 1.")
To_keep = 1
count = Polygons.featureCount()
(sink, Biggest_parts) = self.parameterAsSink(parameters, 'Biggest parts', context,
Polygons.fields(), QgsWkbTypes.MultiPolygon, Polygons.sourceCrs())
for n, feat in enumerate(Polygons.getFeatures()):
if feedback.isCanceled():
break
feedback.setProgress(int(100 * n / count))
geom = feat.geometry()
if geom.isMultipart():
features = feat
geoms = geom.asGeometryCollection()
geomarea = [(i, geoms[i].area()) for i in range(len(geoms))]
geomarea.sort(key=itemgetter(1))
if To_keep == 1:
features.setGeometry(geoms[geomarea[-1][0]])
elif To_keep > len(geoms):
features.setGeometry(geom)
else:
features.setGeometry(geom)
geomres = [geoms[i].asPolygon() for i, a in geomarea[-1 * To_keep:]]
features.setGeometry(QgsGeometry.fromMultiPolygonXY(geomres))
sink.addFeature(features)
else:
sink.addFeature(feat)