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Algorithms and other processing code should use this method (instead of dataobjects.getLayerFromString) to retrieve layers from a string, as it considers the processing context and allows resolving strings to temporarily stored layers. This permits processing models to function correctly when intermediate results are stored as memory layers. Subsequent model algorithms can then access these temporary layers as inputs. All temporary layers will be removed when the context object is destroyed after the model algorithm is run.
215 lines
7.4 KiB
Python
215 lines
7.4 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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Heatmap.py
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---------------------
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Date : December 2016
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Copyright : (C) 2016 by Nyall Dawson
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Email : nyall dot dawson at gmail dot com
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***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************
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"""
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__author__ = 'Nyall Dawson'
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__date__ = 'December 2016'
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__copyright__ = '(C) 2016, Nyall Dawson'
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from processing.gui.wrappers import WidgetWrapper, DIALOG_STANDARD
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from processing.tools import dataobjects
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from processing.core.parameters import _resolveLayers
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import os
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from qgis.PyQt import uic
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from qgis.gui import QgsDoubleSpinBox
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from qgis.core import QgsRectangle
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pluginPath = os.path.dirname(__file__)
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WIDGET, BASE = uic.loadUiType(
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os.path.join(pluginPath, 'RasterResolutionWidget.ui'))
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class HeatmapPixelSizeWidget(BASE, WIDGET):
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def __init__(self):
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super(HeatmapPixelSizeWidget, self).__init__(None)
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self.setupUi(self)
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self.layer_bounds = QgsRectangle()
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self.layer = None
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self.raster_bounds = QgsRectangle()
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self.radius = 100
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self.radius_field = None
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self.mCellXSpinBox.setShowClearButton(False)
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self.mCellYSpinBox.setShowClearButton(False)
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self.mRowsSpinBox.setShowClearButton(False)
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self.mColumnsSpinBox.setShowClearButton(False)
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self.mCellYSpinBox.valueChanged.connect(self.mCellXSpinBox.setValue)
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self.mCellXSpinBox.valueChanged.connect(self.pixelSizeChanged)
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self.mRowsSpinBox.valueChanged.connect(self.rowsChanged)
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self.mColumnsSpinBox.valueChanged.connect(self.columnsChanged)
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def setRadius(self, radius):
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self.radius = radius
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self.recalculate_bounds()
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def setRadiusField(self, radius_field):
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self.radius_field = radius_field
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self.recalculate_bounds()
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def setLayer(self, layer):
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if not layer:
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return
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bounds = layer.extent()
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if bounds.isNull():
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return
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self.layer = layer
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self.layer_bounds = bounds
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self.recalculate_bounds()
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def recalculate_bounds(self):
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self.raster_bounds = QgsRectangle(self.layer_bounds)
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if not self.layer:
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return
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max_radius = self.radius
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if self.radius_field:
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idx = self.layer.fields().lookupField(self.radius_field)
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try:
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max_radius = float(self.layer.maximumValue(idx))
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except:
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pass
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self.raster_bounds.setXMinimum(self.raster_bounds.xMinimum() - max_radius)
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self.raster_bounds.setYMinimum(self.raster_bounds.yMinimum() - max_radius)
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self.raster_bounds.setXMaximum(self.raster_bounds.xMaximum() + max_radius)
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self.raster_bounds.setYMaximum(self.raster_bounds.yMaximum() + max_radius)
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self.pixelSizeChanged()
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def pixelSizeChanged(self):
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cell_size = self.mCellXSpinBox.value()
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if cell_size <= 0:
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return
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self.mCellYSpinBox.blockSignals(True)
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self.mCellYSpinBox.setValue(cell_size)
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self.mCellYSpinBox.blockSignals(False)
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rows = max(round(self.raster_bounds.height() / cell_size) + 1, 1)
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cols = max(round(self.raster_bounds.width() / cell_size) + 1, 1)
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self.mRowsSpinBox.blockSignals(True)
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self.mRowsSpinBox.setValue(rows)
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self.mRowsSpinBox.blockSignals(False)
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self.mColumnsSpinBox.blockSignals(True)
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self.mColumnsSpinBox.setValue(cols)
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self.mColumnsSpinBox.blockSignals(False)
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def rowsChanged(self):
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rows = self.mRowsSpinBox.value()
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if rows <= 0:
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return
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cell_size = self.raster_bounds.height() / rows
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cols = max(round(self.raster_bounds.width() / cell_size) + 1, 1)
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self.mColumnsSpinBox.blockSignals(True)
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self.mColumnsSpinBox.setValue(cols)
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self.mColumnsSpinBox.blockSignals(False)
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for w in [self.mCellXSpinBox, self.mCellYSpinBox]:
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w.blockSignals(True)
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w.setValue(cell_size)
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w.blockSignals(False)
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def columnsChanged(self):
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cols = self.mColumnsSpinBox.value()
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if cols < 2:
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return
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cell_size = self.raster_bounds.width() / (cols - 1)
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rows = max(round(self.raster_bounds.height() / cell_size), 1)
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self.mRowsSpinBox.blockSignals(True)
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self.mRowsSpinBox.setValue(rows)
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self.mRowsSpinBox.blockSignals(False)
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for w in [self.mCellXSpinBox, self.mCellYSpinBox]:
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w.blockSignals(True)
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w.setValue(cell_size)
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w.blockSignals(False)
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def setValue(self, value):
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try:
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numeric_value = float(value)
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except:
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return False
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self.mCellXSpinBox.setValue(numeric_value)
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self.mCellYSpinBox.setValue(numeric_value)
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return True
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def value(self):
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return self.mCellXSpinBox.value()
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class HeatmapPixelSizeWidgetWrapper(WidgetWrapper):
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def _panel(self):
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return HeatmapPixelSizeWidget()
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def createWidget(self):
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if self.dialogType == DIALOG_STANDARD:
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return self._panel()
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else:
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w = QgsDoubleSpinBox()
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w.setShowClearButton(False)
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w.setMinimum(0)
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w.setMaximum(99999999999)
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w.setDecimals(6)
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w.setToolTip(self.tr('Resolution of each pixel in output raster, in layer units'))
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return w
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def postInitialize(self, wrappers):
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if self.dialogType != DIALOG_STANDARD:
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return
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for wrapper in wrappers:
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if wrapper.param.name == self.param.parent_layer:
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self.setLayer(wrapper.value())
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wrapper.widgetValueHasChanged.connect(self.parentLayerChanged)
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elif wrapper.param.name == self.param.radius_param:
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self.setRadius(wrapper.value())
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wrapper.widgetValueHasChanged.connect(self.radiusChanged)
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elif wrapper.param.name == self.param.radius_field_param:
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self.setLayer(wrapper.value())
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wrapper.widgetValueHasChanged.connect(self.radiusFieldChanged)
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def parentLayerChanged(self, wrapper):
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self.setLayer(wrapper.value())
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def setLayer(self, layer):
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context = dataobjects.createContext()
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if isinstance(layer, str):
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layer = dataobjects.QgsProcessingUtils.mapLayerFromString(_resolveLayers(layer), context)
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self.widget.setLayer(layer)
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def radiusChanged(self, wrapper):
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self.setRadius(wrapper.value())
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def setRadius(self, radius):
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self.widget.setRadius(radius)
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def radiusFieldChanged(self, wrapper):
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self.setRadiusField(wrapper.value())
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def setRadiusField(self, radius_field):
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self.widget.setRadiusField(radius_field)
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def setValue(self, value):
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return self.widget.setValue(value)
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def value(self):
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return self.widget.value()
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