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geohashmultidensitymap.py
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geohashmultidensitymap.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 qgis.PyQt.QtCore import QUrl
from qgis.PyQt.QtGui import QIcon
from qgis.core import Qgis
from qgis.core import (
QgsProcessing,
QgsProcessingAlgorithm,
QgsProcessingParameterBoolean,
QgsProcessingParameterEnum,
QgsProcessingParameterField,
QgsProcessingParameterMultipleLayers,
QgsProcessingParameterNumber,
QgsProcessingParameterString,
QgsProcessingParameterDefinition,
QgsProcessingParameterFeatureSink
)
import processing
from . import geohash
from .settings import settings, COLOR_RAMP_MODE
class GeohashMultiLayerDensityMapAlgorithm(QgsProcessingAlgorithm):
def initAlgorithm(self, config=None):
self.addParameter(
QgsProcessingParameterMultipleLayers('INPUT', 'Input point vector layers', QgsProcessing.TypeVectorPoint)
)
param = QgsProcessingParameterNumber('RESOLUTION', 'Geohash resolution',
type=QgsProcessingParameterNumber.Integer, minValue=1, defaultValue=6, maxValue=12, optional=False)
if Qgis.QGIS_VERSION_INT >= 31600:
param.setHelp(
'''
The resolution level of the grid, as defined in the geohash standard.
<br>
<table>
<tr>
<th>Resolution<br>Level</th>
<th>Approximate<br>Dimensions</th>
</tr>
<tr>
<td style="text-align: center">1</td>
<td style="text-align: center">≤ 5,000km X 5,000km</td>
</tr>
<tr>
<td style="text-align: center">2</td>
<td style="text-align: center">≤ 1,250km X 625km</td>
</tr>
<tr>
<td style="text-align: center">3</td>
<td style="text-align: center">≤ 156km X 156km</td>
</tr>
<tr>
<td style="text-align: center">4</td>
<td style="text-align: center">≤ 39.1km X 19.5km</td>
</tr>
<tr>
<td style="text-align: center">5</td>
<td style="text-align: center">≤ 4.89km X 4.89km</td>
</tr>
<tr>
<td style="text-align: center">6</td>
<td style="text-align: center">≤ 1.22km X 0.61km</td>
</tr>
<tr>
<td style="text-align: center">7</td>
<td style="text-align: center">≤ 153m X 153m</td>
</tr>
<tr>
<td style="text-align: center">8</td>
<td style="text-align: center">≤ 38.2m X 19.1m</td>
</tr>
<tr>
<td style="text-align: center">9</td>
<td style="text-align: center">≤ 4.77m X 4.77m</td>
</tr>
<tr>
<td style="text-align: center">10</td>
<td style="text-align: center">≤ 1.19m X 0.596m</td>
</tr>
<tr>
<td style="text-align: center">11</td>
<td style="text-align: center">≤ 149mm X 149mm</td>
</tr>
<tr>
<td style="text-align: center">12</td>
<td style="text-align: center">≤ 37.2mm X 18.6mm</td>
</tr>
</table>
'''
)
self.addParameter(param)
if Qgis.QGIS_VERSION_INT >= 32200:
ramp_name_param = QgsProcessingParameterString('RAMP_NAMES', 'Select color ramp', defaultValue=settings.defaultColorRamp())
ramp_name_param.setMetadata( {'widget_wrapper': {'value_hints': settings.ramp_names } } )
else:
ramp_name_param = QgsProcessingParameterEnum(
'RAMP_NAMES',
'Select color ramp',
options=settings.ramp_names,
defaultValue=settings.defaultColorRampIndex(),
optional=False)
self.addParameter(ramp_name_param)
self.addParameter(
QgsProcessingParameterBoolean(
'INVERT',
'Invert color ramp',
False,
optional=False)
)
param = QgsProcessingParameterField(
'WEIGHT',
'Weight field',
parentLayerParameterName='INPUT',
type=QgsProcessingParameterField.Numeric,
optional=True)
param.setFlags(param.flags() | QgsProcessingParameterDefinition.FlagAdvanced)
self.addParameter(param)
param = QgsProcessingParameterNumber(
'CLASSES',
'Number of gradient colors',
QgsProcessingParameterNumber.Integer,
defaultValue=settings.num_ramp_classes,
minValue=2,
optional=False)
param.setFlags(param.flags() | QgsProcessingParameterDefinition.FlagAdvanced)
self.addParameter(param)
param = QgsProcessingParameterEnum(
'COLOR_RAMP_MODE',
'Color ramp mode',
options=COLOR_RAMP_MODE,
defaultValue=settings.color_ramp_mode,
optional=False)
param.setFlags(param.flags() | QgsProcessingParameterDefinition.FlagAdvanced)
self.addParameter(param)
param = QgsProcessingParameterBoolean(
'NO_OUTLINE',
'No feature outlines',
True,
optional=False)
param.setFlags(param.flags() | QgsProcessingParameterDefinition.FlagAdvanced)
self.addParameter(param)
self.addParameter(
QgsProcessingParameterFeatureSink('OUTPUT', 'Output geohash density map',
type=QgsProcessing.TypeVectorPolygon, createByDefault=True, defaultValue=None)
)
def processAlgorithm(self, parameters, context, feedback):
resolution = self.parameterAsInt(parameters, 'RESOLUTION', context)
num_classes = self.parameterAsInt(parameters, 'CLASSES', context)
if 'WEIGHT' in parameters and parameters['WEIGHT']:
use_weight = True
weight_field = self.parameterAsString(parameters, 'WEIGHT', context)
else:
use_weight = False
if Qgis.QGIS_VERSION_INT >= 32200:
# In this case ramp_name will be the name
ramp_name = self.parameterAsString(parameters, 'RAMP_NAMES', context)
else:
# In this case ramp_name will be an index into ramp_names
ramp_name = self.parameterAsEnum(parameters, 'RAMP_NAMES', context)
ramp_mode = self.parameterAsInt(parameters, 'COLOR_RAMP_MODE', context)
no_outline = self.parameterAsBool(parameters, 'NO_OUTLINE', context)
invert = self.parameterAsBool(parameters, 'INVERT', context)
results = {}
outputs = {}
alg_params = {
'INPUT': parameters['INPUT'],
'RESOLUTION': resolution,
'OUTPUT': parameters['OUTPUT']
}
if use_weight:
alg_params['WEIGHT'] = weight_field
outputs['CreateGrid'] = processing.run('densityanalysis:geohashmultidensity', alg_params, context=context, feedback=feedback, is_child_algorithm=True)
results['OUTPUT'] = outputs['CreateGrid']['OUTPUT']
# Apply a graduated style
alg_params = {
'NO_OUTLINE': no_outline,
'INVERT': invert,
'CLASSES': num_classes,
'GROUP_FIELD': 'NUMPOINTS',
'INPUT': outputs['CreateGrid']['OUTPUT'],
'MODE': ramp_mode,
'RAMP_NAMES': ramp_name
}
processing.run('densityanalysis:graduatedstyle', alg_params, context=context, feedback=feedback, is_child_algorithm=False)
return results
def group(self):
return 'Geohash density'
def groupId(self):
return 'geohashdensity'
def name(self):
return 'geohashmultidensitymap'
def displayName(self):
return 'Styled geohash multi-layer density map'
def icon(self):
return QIcon(os.path.join(os.path.dirname(__file__), 'icons/ml_geohash.png'))
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 createInstance(self):
return GeohashMultiLayerDensityMapAlgorithm()