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createCircle.py
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createCircle.py
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"""
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
"""
import os
from geographiclib.geodesic import Geodesic
from qgis.core import (
QgsPointXY, QgsGeometry, QgsField,
QgsProject, QgsWkbTypes, QgsCoordinateTransform, QgsPropertyDefinition)
from qgis.core import (
QgsProcessing,
QgsProcessingParameters,
QgsProcessingFeatureBasedAlgorithm,
QgsProcessingParameterBoolean,
QgsProcessingParameterNumber,
QgsProcessingParameterEnum)
from qgis.PyQt.QtGui import QIcon
from qgis.PyQt.QtCore import QVariant, QUrl
from .settings import settings, epsg4326, geod
from .utils import tr, conversionToMeters, DISTANCE_LABELS, makeIdlCrossingsPositive, hasIdlCrossing
SHAPE_TYPE = [tr("Polygon"), tr("Line")]
class CreateCircleAlgorithm(QgsProcessingFeatureBasedAlgorithm):
"""
Algorithm to create a circle shape.
"""
PrmShapeType = 'ShapeType'
PrmRadius = 'Radius'
PrmUnitsOfMeasure = 'UnitsOfMeasure'
PrmDrawingSegments = 'DrawingSegments'
PrmExportInputGeometry = 'ExportInputGeometry'
def createInstance(self):
return CreateCircleAlgorithm()
def name(self):
return 'createcircle'
def icon(self):
return QIcon(os.path.join(os.path.dirname(__file__), 'images/circle.png'))
def displayName(self):
return tr('Create circle')
def group(self):
return tr('Geodesic shapes')
def groupId(self):
return 'vectorcreation'
def outputName(self):
return tr('Output layer')
def helpUrl(self):
file = os.path.dirname(__file__) + '/index.html'
if not os.path.exists(file):
return ''
return QUrl.fromLocalFile(file).toString(QUrl.FullyEncoded)
def inputLayerTypes(self):
return [QgsProcessing.TypeVectorPoint]
def outputWkbType(self, input_wkb_type):
if self.shape_type == 0:
return (QgsWkbTypes.Polygon)
return (QgsWkbTypes.LineString)
def outputFields(self, input_fields):
if self.export_geom:
name_x, name_y = settings.getGeomNames(input_fields.names())
input_fields.append(QgsField(name_x, QVariant.Double))
input_fields.append(QgsField(name_y, QVariant.Double))
return(input_fields)
def supportInPlaceEdit(self, layer):
return False
def initParameters(self, config=None):
self.shape_type = 0
self.export_geom = False
self.addParameter(
QgsProcessingParameterEnum(
self.PrmShapeType,
tr('Shape type'),
options=SHAPE_TYPE,
defaultValue=0,
optional=False)
)
param = QgsProcessingParameterNumber(
self.PrmRadius,
tr('Circle radius'),
QgsProcessingParameterNumber.Double,
defaultValue=20.0,
minValue=0,
optional=False)
param.setIsDynamic(True)
param.setDynamicPropertyDefinition(QgsPropertyDefinition(
self.PrmRadius,
tr('Circle radius'),
QgsPropertyDefinition.Double))
param.setDynamicLayerParameterName('INPUT')
self.addParameter(param)
self.addParameter(
QgsProcessingParameterEnum(
self.PrmUnitsOfMeasure,
tr('Radius units'),
options=DISTANCE_LABELS,
defaultValue=0,
optional=False)
)
self.addParameter(
QgsProcessingParameterNumber(
self.PrmDrawingSegments,
tr('Number of drawing segments'),
QgsProcessingParameterNumber.Integer,
defaultValue=36,
minValue=4,
optional=True)
)
self.addParameter(
QgsProcessingParameterBoolean(
self.PrmExportInputGeometry,
tr('Add input geometry fields to output table'),
False,
optional=True)
)
def prepareAlgorithm(self, parameters, context, feedback):
self.shape_type = self.parameterAsInt(parameters, self.PrmShapeType, context)
self.outer_radius = self.parameterAsDouble(parameters, self.PrmRadius, context)
if self.outer_radius <= 0:
feedback.reportError('Outer radius parameter must be greater than 0')
return False
self.outer_radius_dyn = QgsProcessingParameters.isDynamic(parameters, self.PrmRadius)
if self.outer_radius_dyn:
self.outer_radius_property = parameters[self.PrmRadius]
segments = self.parameterAsInt(parameters, self.PrmDrawingSegments, context)
units = self.parameterAsInt(parameters, self.PrmUnitsOfMeasure, context)
self.export_geom = self.parameterAsBool(parameters, self.PrmExportInputGeometry, context)
self.measure_factor = conversionToMeters(units)
self.outer_radius_converted = self.outer_radius * self.measure_factor
self.pt_spacing = 360.0 / segments
source = self.parameterAsSource(parameters, 'INPUT', context)
src_crs = source.sourceCrs()
self.total_features = source.featureCount()
if src_crs != epsg4326:
self.geom_to_4326 = QgsCoordinateTransform(src_crs, epsg4326, QgsProject.instance())
self.to_sink_crs = QgsCoordinateTransform(epsg4326, src_crs, QgsProject.instance())
else:
self.geom_to_4326 = None
self.to_sink_crs = None
self.num_bad = 0
return True
def processFeature(self, feature, context, feedback):
try:
pts_in = []
pts_out = []
pt = feature.geometry().asPoint()
pt_orig_x = pt.x()
pt_orig_y = pt.y()
# make sure the coordinates are in EPSG:4326
if self.geom_to_4326:
pt = self.geom_to_4326.transform(pt.x(), pt.y())
lat = pt.y()
lon = pt.x()
if self.outer_radius_dyn:
outer_rad, e = self.outer_radius_property.valueAsDouble(context.expressionContext(), self.outer_radius)
outer_rad *= self.measure_factor
if not e or outer_rad <= 0:
self.num_bad += 1
return []
else:
outer_rad = self.outer_radius_converted
angle = 0
while angle < 360:
g = geod.Direct(lat, lon, angle, outer_rad, Geodesic.LATITUDE | Geodesic.LONGITUDE)
pts_out.append(QgsPointXY(g['lon2'], g['lat2']))
angle += self.pt_spacing
pts_out.append(pts_out[0])
crosses_idl = hasIdlCrossing(pts_out)
if crosses_idl:
makeIdlCrossingsPositive(pts_out, True)
# If the Output crs is not 4326 transform the points to the proper crs
if self.to_sink_crs:
for x, pt_out in enumerate(pts_out):
pts_out[x] = self.to_sink_crs.transform(pt_out)
if self.shape_type == 0:
feature.setGeometry(QgsGeometry.fromPolygonXY([pts_out]))
else:
feature.setGeometry(QgsGeometry.fromMultiPolylineXY([pts_out]))
if self.export_geom:
attr = feature.attributes()
attr.append(pt_orig_x)
attr.append(pt_orig_y)
feature.setAttributes(attr)
except Exception:
self.num_bad += 1
return []
return [feature]
def postProcessAlgorithm(self, context, feedback):
if self.num_bad:
feedback.pushInfo(tr("{} out of {} features had invalid parameters and were ignored.".format(self.num_bad, self.total_features)))
return {}