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createHeart.py
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createHeart.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
import math
from geographiclib.geodesic import Geodesic
from qgis.core import (
QgsPointXY, QgsGeometry, QgsField, QgsPropertyDefinition,
QgsProject, QgsWkbTypes, QgsCoordinateTransform)
from qgis.core import (
QgsProcessing,
QgsProcessingParameters,
QgsProcessingFeatureBasedAlgorithm,
QgsProcessingParameterBoolean,
QgsProcessingParameterNumber,
QgsProcessingParameterEnum,
QgsProcessingParameterFeatureSource,
QgsProcessingParameterField,
QgsProcessingParameterFeatureSink)
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
SHAPE_TYPE = [tr("Polygon"), tr("Line")]
class CreateHeartAlgorithm(QgsProcessingFeatureBasedAlgorithm):
"""
Algorithm to create a epicycloid shape.
"""
PrmShapeType = 'ShapeType'
PrmRadius = 'Radius'
PrmStartingAngle = 'StartingAngle'
PrmUnitsOfMeasure = 'UnitsOfMeasure'
PrmDrawingSegments = 'DrawingSegments'
PrmExportInputGeometry = 'ExportInputGeometry'
def createInstance(self):
return CreateHeartAlgorithm()
def name(self):
return 'createheart'
def icon(self):
return QIcon(os.path.join(os.path.dirname(__file__), 'images/heart.png'))
def displayName(self):
return tr('Create heart')
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.PrmStartingAngle,
tr('Starting angle'),
QgsProcessingParameterNumber.Double,
defaultValue=0,
optional=False)
param.setIsDynamic(True)
param.setDynamicPropertyDefinition(QgsPropertyDefinition(
self.PrmStartingAngle,
tr('Starting angle'),
QgsPropertyDefinition.Double))
param.setDynamicLayerParameterName('INPUT')
self.addParameter(param)
param = QgsProcessingParameterNumber(
self.PrmRadius,
tr('Maximum radius'),
QgsProcessingParameterNumber.Double,
defaultValue=40.0,
minValue=0,
optional=False)
param.setIsDynamic(True)
param.setDynamicPropertyDefinition(QgsPropertyDefinition(
self.PrmRadius,
tr('Maximum radius'),
QgsPropertyDefinition.Double))
param.setDynamicLayerParameterName('INPUT')
self.addParameter(param)
self.addParameter(
QgsProcessingParameterEnum(
self.PrmUnitsOfMeasure,
tr('Radius units of measure'),
options=DISTANCE_LABELS,
defaultValue=0,
optional=False)
)
self.addParameter(
QgsProcessingParameterNumber(
self.PrmDrawingSegments,
tr('Number of drawing segments'),
QgsProcessingParameterNumber.Integer,
defaultValue=720,
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.radius = self.parameterAsDouble(parameters, self.PrmRadius, context)
self.radius_dyn = QgsProcessingParameters.isDynamic(parameters, self.PrmRadius)
if self.radius_dyn:
self.radius_property = parameters[self.PrmRadius]
self.start_angle = self.parameterAsDouble(parameters, self.PrmStartingAngle, context)
self.start_angle_dyn = QgsProcessingParameters.isDynamic(parameters, self.PrmStartingAngle)
if self.start_angle_dyn:
self.start_angle_property = parameters[self.PrmStartingAngle]
segments = self.parameterAsInt(parameters, self.PrmDrawingSegments, context)
units = self.parameterAsInt(parameters, self.PrmUnitsOfMeasure, context)
self.export_geom = self.parameterAsBool(parameters, self.PrmExportInputGeometry, context)
# The algorithm creates the heart on its side so this rotates
# it so that it is upright.
self.start_angle -= 90.0
self.measureFactor = conversionToMeters(units)
self.radius_converted = self.radius * self.measureFactor
self.step = 360.0 / segments
source = self.parameterAsSource(parameters, 'INPUT', context)
srcCRS = source.sourceCrs()
self.total_features = source.featureCount()
if srcCRS != epsg4326:
self.geomTo4326 = QgsCoordinateTransform(srcCRS, epsg4326, QgsProject.instance())
self.toSinkCrs = QgsCoordinateTransform(epsg4326, srcCRS, QgsProject.instance())
else:
self.geomTo4326 = None
self.toSinkCrs = None
self.num_bad = 0
return True
def processFeature(self, feature, context, feedback):
try:
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 []
sangle = sangle - 90
else:
sangle = self.start_angle
if self.radius_dyn:
radius2, e = self.radius_property.valueAsDouble(context.expressionContext(), self.radius)
if not e or radius2 <= 0:
self.num_bad += 1
return []
radius2 *= self.measureFactor
else:
radius2 = self.radius_converted
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.geomTo4326:
pt = self.geomTo4326.transform(pt.x(), pt.y())
angle = 0.0
while angle <= 360.0:
a = math.radians(angle)
sina = math.sin(a)
x = 16 * sina * sina * sina
y = 13 * math.cos(a) - 5 * math.cos(2 * a) - 2 * math.cos(3 * a) - math.cos(4 * a)
dist = math.sqrt(x * x + y * y) * radius2 / 17.0
a2 = math.degrees(math.atan2(y, x)) + sangle
g = geod.Direct(pt.y(), pt.x(), a2, dist, Geodesic.LATITUDE | Geodesic.LONGITUDE)
pts.append(QgsPointXY(g['lon2'], g['lat2']))
angle += self.step
makeIdlCrossingsPositive(pts)
# If the Output crs is not 4326 transform the points to the proper crs
if self.toSinkCrs:
for x, ptout in enumerate(pts):
pts[x] = self.toSinkCrs.transform(ptout)
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)
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 {}