本文整理汇总了Python中qgis.core.QgsGeometry.vertexAt方法的典型用法代码示例。如果您正苦于以下问题：Python QgsGeometry.vertexAt方法的具体用法？Python QgsGeometry.vertexAt怎么用？Python QgsGeometry.vertexAt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.vertexAt方法的2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: snapToPrecision
# 需要导入模块: from qgis.core import QgsGeometry [as 别名]
# 或者: from qgis.core.QgsGeometry import vertexAt [as 别名]
def snapToPrecision(geom, precision):
snapped = QgsGeometry(geom)
if precision == 0.0:
return snapped
i = 0
p = snapped.vertexAt(i)
while p.x() != 0.0 and p.y() != 0.0:
x = round(p.x() / precision, 0) * precision
y = round(p.y() / precision, 0) * precision
snapped.moveVertex(x, y, i)
i = i + 1
p = snapped.vertexAt(i)
return snapped示例2: in_mask
# 需要导入模块: from qgis.core import QgsGeometry [as 别名]
# 或者: from qgis.core.QgsGeometry import vertexAt [as 别名]
def in_mask(self, feature, srid=None):
if feature is None: # expression overview
return False
if self.layer is None:
return False
try:
# layer is not None but destroyed ?
self.layer.id()
except:
self.reset_mask_layer()
return False
# mask layer empty due to unloaded memlayersaver plugin > no filtering
if self.layer.featureCount() == 0:
return True
mask_geom, bbox = self.mask_geometry()
geom = QgsGeometry(feature.geometry())
if not geom.isGeosValid():
geom = geom.buffer(0.0, 1)
if geom is None:
return False
if srid is not None and self.layer.crs().postgisSrid() != srid:
src_crs = QgsCoordinateReferenceSystem(srid)
dest_crs = self.layer.crs()
xform = QgsCoordinateTransform(src_crs, dest_crs, QgsProject.instance())
try:
geom.transform(xform)
except:
# transformation error. Check layer projection.
pass
if geom.type() == QgsWkbTypes.PolygonGeometry:
if self.parameters.polygon_mask_method == 2 and not self.has_point_on_surface:
self.parameters.polygon_mask_method = 1
if self.parameters.polygon_mask_method == 0:
# this method can only work when no geometry simplification is involved
return (mask_geom.overlaps(geom) or mask_geom.contains(geom))
elif self.parameters.polygon_mask_method == 1:
# the fastest method, but with possible inaccuracies
pt = geom.vertexAt(0)
return bbox.contains(QgsPointXY(pt)) and mask_geom.contains(geom.centroid())
elif self.parameters.polygon_mask_method == 2:
# will always work
pt = geom.vertexAt(0)
return bbox.contains(QgsPointXY(pt)) and mask_geom.contains(geom.pointOnSurface())
else:
return False
elif geom.type() == QgsWkbTypes.LineGeometry:
if self.parameters.line_mask_method == 0:
return mask_geom.intersects(geom)
elif self.parameters.line_mask_method == 1:
return mask_geom.contains(geom)
else:
return False
elif geom.type() == QgsWkbTypes.PointGeometry:
return mask_geom.intersects(geom)
else:
return False