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interactiveCreateDonut.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, QgsFeature,
QgsProject, QgsWkbTypes, QgsCoordinateTransform, QgsFields, QgsPropertyDefinition)
from qgis.core import (
QgsProcessing,
QgsProcessingParameters,
QgsProcessingAlgorithm,
QgsProcessingException,
QgsProcessingParameterPoint,
QgsProcessingParameterBoolean,
QgsProcessingParameterNumber,
QgsProcessingParameterFeatureSink,
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 InteractiveCreateDonutAlgorithm(QgsProcessingAlgorithm):
"""
Algorithm to create a donut shape.
"""
PrmShapeType = 'ShapeType'
PrmOuterRadius = 'OuterRadius'
PrmInnerRadius = 'InnerRadius'
PrmUnitsOfMeasure = 'UnitsOfMeasure'
PrmDrawingSegments = 'DrawingSegments'
PrmExportInputGeometry = 'ExportInputGeometry'
PrmCoordinate = 'Coordinate'
PrmOutput = 'OUTPUT'
def createInstance(self):
return InteractiveCreateDonutAlgorithm()
def name(self):
return 'interactivedonut'
def icon(self):
return QIcon(os.path.join(os.path.dirname(__file__), 'images/donut.png'))
def displayName(self):
return tr('Interactive donut')
def group(self):
return tr('Interactive geodesic shapes')
def groupId(self):
return 'interactiveshapes'
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 supportInPlaceEdit(self, layer):
return True
def initAlgorithm(self, config=None):
self.shape_type = 0
self.addParameter(
QgsProcessingParameterPoint(
self.PrmCoordinate,
tr('Select an input coordinate'),
optional=False)
)
self.addParameter(
QgsProcessingParameterEnum(
self.PrmShapeType,
tr('Shape type'),
options=SHAPE_TYPE,
defaultValue=0,
optional=False)
)
param = QgsProcessingParameterNumber(
self.PrmOuterRadius,
tr('Outer radius'),
QgsProcessingParameterNumber.Double,
defaultValue=20.0,
minValue=0,
optional=False)
self.addParameter(param)
param = QgsProcessingParameterNumber(
self.PrmInnerRadius,
tr('Inner radius'),
QgsProcessingParameterNumber.Double,
defaultValue=10.0,
minValue=0,
optional=False)
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=72,
minValue=4,
optional=True)
)
self.addParameter(
QgsProcessingParameterFeatureSink(
self.PrmOutput,
tr('Donut polygon'))
)
def processAlgorithm(self, parameters, context, feedback):
shape_type = self.parameterAsInt(parameters, self.PrmShapeType, context)
outer_radius = self.parameterAsDouble(parameters, self.PrmOuterRadius, context)
if outer_radius <= 0:
raise QgsProcessingException('Outer radius parameter must be greater than 0')
inner_radius = self.parameterAsDouble(parameters, self.PrmInnerRadius, context)
segments = self.parameterAsInt(parameters, self.PrmDrawingSegments, context)
units = self.parameterAsInt(parameters, self.PrmUnitsOfMeasure, context)
pt = self.parameterAsPoint(parameters, self.PrmCoordinate, context, crs=epsg4326)
measure_factor = conversionToMeters(units)
inner_rad = inner_radius * measure_factor
outer_rad = outer_radius * measure_factor
pt_spacing = 360.0 / segments
if shape_type == 0:
(sink, dest_id) = self.parameterAsSink(
parameters, self.PrmOutput,
context, QgsFields(), QgsWkbTypes.Polygon, epsg4326)
else:
(sink, dest_id) = self.parameterAsSink(
parameters, self.PrmOutput,
context, QgsFields(), QgsWkbTypes.MultiLineString, epsg4326)
try:
pts_in = []
pts_out = []
lat = pt.y()
lon = pt.x()
angle = 0
while angle < 360:
if inner_rad != 0:
g = geod.Direct(lat, lon, angle, inner_rad, Geodesic.LATITUDE | Geodesic.LONGITUDE)
pts_in.append(QgsPointXY(g['lon2'], g['lat2']))
g = geod.Direct(lat, lon, angle, outer_rad, Geodesic.LATITUDE | Geodesic.LONGITUDE)
pts_out.append(QgsPointXY(g['lon2'], g['lat2']))
angle += pt_spacing
if inner_rad != 0:
pts_in.append(pts_in[0])
pts_out.append(pts_out[0])
crosses_idl = hasIdlCrossing(pts_out)
if crosses_idl:
if inner_rad != 0:
makeIdlCrossingsPositive(pts_in, True)
makeIdlCrossingsPositive(pts_out, True)
feature = QgsFeature()
if shape_type == 0:
if inner_rad == 0:
feature.setGeometry(QgsGeometry.fromPolygonXY([pts_out]))
else:
feature.setGeometry(QgsGeometry.fromPolygonXY([pts_out, pts_in]))
else:
if inner_rad == 0:
feature.setGeometry(QgsGeometry.fromMultiPolylineXY([pts_out]))
else:
feature.setGeometry(QgsGeometry.fromMultiPolylineXY([pts_out, pts_in]))
sink.addFeature(feature)
except Exception:
raise QgsProcessingException('Invalid coordinate')
return {self.PrmOutput: dest_id}