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createArc.py
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createArc.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,
QgsProcessingFeatureBasedAlgorithm,
QgsProcessingParameters,
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, makeIdlCrossingsPositive, DISTANCE_LABELS, hasIdlCrossing
SHAPE_TYPE = [tr("Polygon"), tr("Line")]
class CreateArcAlgorithm(QgsProcessingFeatureBasedAlgorithm):
"""
Algorithm to create a donut shape.
"""
PrmShapeType = 'ShapeType'
PrmAzimuthMode = 'AzimuthMode'
PrmAzimuth1 = 'Azimuth1'
PrmAzimuth2 = 'Azimuth2'
PrmInnerRadius = 'InnerRadius'
PrmOuterRadius = 'OuterRadius'
PrmUnitsOfMeasure = 'UnitsOfMeasure'
PrmDrawingSegments = 'DrawingSegments'
PrmExportInputGeometry = 'ExportInputGeometry'
def createInstance(self):
return CreateArcAlgorithm()
def name(self):
return 'createarc'
def icon(self):
return QIcon(os.path.join(os.path.dirname(__file__), 'images/arc.png'))
def displayName(self):
return tr('Create arc wedge')
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)
)
self.addParameter(
QgsProcessingParameterEnum(
self.PrmAzimuthMode,
tr('Azimuth mode'),
options=[tr('Use beginning and ending azimuths'), tr('Use center azimuth and azimuth width')],
defaultValue=1,
optional=False)
)
param = QgsProcessingParameterNumber(
self.PrmAzimuth1,
tr('Beginning azimuth / Center azimuth'),
QgsProcessingParameterNumber.Double,
defaultValue=0,
optional=False)
param.setIsDynamic(True)
param.setDynamicPropertyDefinition(QgsPropertyDefinition(
self.PrmAzimuth1,
tr('Beginning azimuth / Center azimuth'),
QgsPropertyDefinition.Double))
param.setDynamicLayerParameterName('INPUT')
self.addParameter(param)
param = QgsProcessingParameterNumber(
self.PrmAzimuth2,
tr('Ending azimuth / Azimuth width'),
QgsProcessingParameterNumber.Double,
defaultValue=30.0,
optional=False)
param.setIsDynamic(True)
param.setDynamicPropertyDefinition(QgsPropertyDefinition(
self.PrmAzimuth2,
tr('Ending azimuth / Azimuth width'),
QgsPropertyDefinition.Double))
param.setDynamicLayerParameterName('INPUT')
self.addParameter(param)
param = QgsProcessingParameterNumber(
self.PrmOuterRadius,
tr('Outer radius'),
QgsProcessingParameterNumber.Double,
defaultValue=40.0,
minValue=0,
optional=False)
param.setIsDynamic(True)
param.setDynamicPropertyDefinition(QgsPropertyDefinition(
self.PrmOuterRadius,
tr('Outer radius'),
QgsPropertyDefinition.Double))
param.setDynamicLayerParameterName('INPUT')
self.addParameter(param)
param = QgsProcessingParameterNumber(
self.PrmInnerRadius,
tr('Inner radius'),
QgsProcessingParameterNumber.Double,
defaultValue=20.0,
minValue=0,
optional=False)
param.setIsDynamic(True)
param.setDynamicPropertyDefinition(QgsPropertyDefinition(
self.PrmInnerRadius,
tr('Inner 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.azimuth_mode = self.parameterAsInt(parameters, self.PrmAzimuthMode, context)
self.start_angle = self.parameterAsDouble(parameters, self.PrmAzimuth1, context)
self.start_angle_dyn = QgsProcessingParameters.isDynamic(parameters, self.PrmAzimuth1)
if self.start_angle_dyn:
self.start_angle_property = parameters[self.PrmAzimuth1]
self.end_angle = self.parameterAsDouble(parameters, self.PrmAzimuth2, context)
self.end_angle_dyn = QgsProcessingParameters.isDynamic(parameters, self.PrmAzimuth2)
if self.end_angle_dyn:
self.end_angle_property = parameters[self.PrmAzimuth2]
self.outer_radius = self.parameterAsDouble(parameters, self.PrmOuterRadius, 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.PrmOuterRadius)
if self.outer_radius_dyn:
self.outer_radius_property = parameters[self.PrmOuterRadius]
self.inner_radius = self.parameterAsDouble(parameters, self.PrmInnerRadius, context)
self.inner_radius_dyn = QgsProcessingParameters.isDynamic(parameters, self.PrmInnerRadius)
if self.inner_radius_dyn:
self.inner_radius_property = parameters[self.PrmInnerRadius]
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.inner_radius_converted = self.inner_radius * self.measure_factor
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 = []
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())
if self.start_angle_dyn:
sangle, e = self.start_angle_property.valueAsDouble(context.expressionContext(), self.start_angle)
if not e:
self.num_bad += 1
return []
else:
sangle = self.start_angle
if self.end_angle_dyn:
eangle, e = self.end_angle_property.valueAsDouble(context.expressionContext(), self.end_angle)
if not e:
self.num_bad += 1
return []
else:
eangle = self.end_angle
if self.azimuth_mode == 1:
width = abs(eangle) / 2.0
eangle = sangle + width
sangle -= width
if self.outer_radius_dyn:
outer_dist, e = self.outer_radius_property.valueAsDouble(context.expressionContext(), self.outer_radius)
if not e or outer_dist <= 0:
self.num_bad += 1
return []
outer_dist *= self.measure_factor
else:
outer_dist = self.outer_radius_converted
if self.inner_radius_dyn:
inner_dist, e = self.inner_radius_property.valueAsDouble(context.expressionContext(), self.inner_radius)
inner_dist *= self.measure_factor
if not e:
self.num_bad += 1
return []
else:
inner_dist = self.inner_radius_converted
sangle = sangle % 360
eangle = eangle % 360
if sangle == eangle: # Create a donut instead
feedback.pushInfo('Creating donut')
angle = 0
pts_in = []
while angle < 360:
if inner_dist != 0:
g = geod.Direct(pt.y(), pt.x(), angle, inner_dist, Geodesic.LATITUDE | Geodesic.LONGITUDE)
pts_in.append(QgsPointXY(g['lon2'], g['lat2']))
g = geod.Direct(pt.y(), pt.x(), angle, outer_dist, Geodesic.LATITUDE | Geodesic.LONGITUDE)
pts.append(QgsPointXY(g['lon2'], g['lat2']))
angle += self.pt_spacing
if inner_dist != 0:
pts_in.append(pts_in[0])
pts.append(pts[0]) # Outer point ring
crosses_idl = hasIdlCrossing(pts)
if crosses_idl:
if inner_dist != 0:
makeIdlCrossingsPositive(pts_in, True)
makeIdlCrossingsPositive(pts, True)
# If the Output crs is not 4326 transform the points to the proper crs
if self.to_sink_crs:
if inner_dist != 0:
for x, pt_out in enumerate(pts_in):
pts_in[x] = self.to_sink_crs.transform(pt_out)
for x, pt_out in enumerate(pts):
pts[x] = self.to_sink_crs.transform(pt_out)
if self.shape_type == 0:
if inner_dist == 0:
feature.setGeometry(QgsGeometry.fromPolygonXY([pts]))
else:
feature.setGeometry(QgsGeometry.fromPolygonXY([pts, pts_in]))
else:
if inner_dist == 0:
feature.setGeometry(QgsGeometry.fromMultiPolylineXY([pts]))
else:
feature.setGeometry(QgsGeometry.fromMultiPolylineXY([pts, pts_in]))
else:
if sangle > eangle:
# We are crossing the 0 boundary so lets just subtract
# 360 from it.
sangle -= 360.0
sanglesave = sangle
while sangle < eangle: # Draw the outer arc
g = geod.Direct(pt.y(), pt.x(), sangle, outer_dist, Geodesic.LATITUDE | Geodesic.LONGITUDE)
pts.append(QgsPointXY(g['lon2'], g['lat2']))
sangle += self.pt_spacing # add this number of degrees to the angle
g = geod.Direct(pt.y(), pt.x(), eangle, outer_dist, Geodesic.LATITUDE | Geodesic.LONGITUDE)
pts.append(QgsPointXY(g['lon2'], g['lat2']))
if inner_dist == 0: # This will just be a pie wedge
pts.append(pt)
else:
sangle = sanglesave
while eangle > sangle: # Draw the inner arc
g = geod.Direct(pt.y(), pt.x(), eangle, inner_dist, Geodesic.LATITUDE | Geodesic.LONGITUDE)
pts.append(QgsPointXY(g['lon2'], g['lat2']))
eangle -= self.pt_spacing # subtract this number of degrees to the angle
g = geod.Direct(pt.y(), pt.x(), sangle, inner_dist, Geodesic.LATITUDE | Geodesic.LONGITUDE)
pts.append(QgsPointXY(g['lon2'], g['lat2']))
pts.append(pts[0])
makeIdlCrossingsPositive(pts)
# 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):
pts[x] = self.to_sink_crs.transform(pt_out)
if self.shape_type == 0:
feature.setGeometry(QgsGeometry.fromPolygonXY([pts]))
else:
feature.setGeometry(QgsGeometry.fromPolylineXY(pts))
if self.export_geom:
attr = feature.attributes()
attr.append(pt_orig_x)
attr.append(pt_orig_y)
feature.setAttributes(attr)
return [feature]
except Exception:
self.num_bad += 1
return []
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 {}