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[processing][heatmap] custom parameter/widget for output resolution
Matches current behaviour of c++ heatmap plugin
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python/plugins/processing/algs/qgis/ui/HeatmapWidgets.py
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| # -*- coding: utf-8 -*- | ||
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| """ | ||
| *************************************************************************** | ||
| Heatmap.py | ||
| --------------------- | ||
| Date : December 2016 | ||
| Copyright : (C) 2016 by Nyall Dawson | ||
| Email : nyall dot dawson at gmail dot com | ||
| *************************************************************************** | ||
| * * | ||
| * 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. * | ||
| * * | ||
| *************************************************************************** | ||
| """ | ||
|
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| __author__ = 'Nyall Dawson' | ||
| __date__ = 'December 2016' | ||
| __copyright__ = '(C) 2016, Nyall Dawson' | ||
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| from processing.gui.wrappers import WidgetWrapper, DIALOG_STANDARD | ||
| from processing.tools import dataobjects | ||
| from processing.core.parameters import _resolveLayers | ||
| import os | ||
| from qgis.PyQt import uic | ||
| from qgis.gui import QgsDoubleSpinBox | ||
| from qgis.core import QgsRectangle | ||
|
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| pluginPath = os.path.dirname(__file__) | ||
| WIDGET, BASE = uic.loadUiType( | ||
| os.path.join(pluginPath, 'RasterResolutionWidget.ui')) | ||
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| class HeatmapPixelSizeWidget(BASE, WIDGET): | ||
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| def __init__(self): | ||
| super(HeatmapPixelSizeWidget, self).__init__(None) | ||
| self.setupUi(self) | ||
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| self.layer_bounds = QgsRectangle() | ||
| self.layer = None | ||
| self.raster_bounds = QgsRectangle() | ||
| self.radius = 100 | ||
| self.radius_field = None | ||
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| self.mCellXSpinBox.setShowClearButton(False) | ||
| self.mCellYSpinBox.setShowClearButton(False) | ||
| self.mRowsSpinBox.setShowClearButton(False) | ||
| self.mColumnsSpinBox.setShowClearButton(False) | ||
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| self.mCellYSpinBox.valueChanged.connect(self.mCellXSpinBox.setValue) | ||
| self.mCellXSpinBox.valueChanged.connect(self.pixelSizeChanged) | ||
| self.mRowsSpinBox.valueChanged.connect(self.rowsChanged) | ||
| self.mColumnsSpinBox.valueChanged.connect(self.columnsChanged) | ||
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| def setRadius(self, radius): | ||
| self.radius = radius | ||
| self.recalculate_bounds() | ||
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| def setRadiusField(self, radius_field): | ||
| self.radius_field = radius_field | ||
| self.recalculate_bounds() | ||
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| def setLayer(self, layer): | ||
| if not layer: | ||
| return | ||
| bounds = layer.extent() | ||
| if bounds.isNull(): | ||
| return | ||
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| self.layer = layer | ||
| self.layer_bounds = bounds | ||
| self.recalculate_bounds() | ||
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| def recalculate_bounds(self): | ||
| self.raster_bounds = QgsRectangle(self.layer_bounds) | ||
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| if not self.layer: | ||
| return | ||
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| max_radius = self.radius | ||
| if self.radius_field: | ||
| idx = self.layer.fields().lookupField(self.radius_field) | ||
| try: | ||
| max_radius = float(self.layer.maximumValue(idx)) | ||
| except: | ||
| pass | ||
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| self.raster_bounds.setXMinimum(self.raster_bounds.xMinimum() - max_radius) | ||
| self.raster_bounds.setYMinimum(self.raster_bounds.yMinimum() - max_radius) | ||
| self.raster_bounds.setXMaximum(self.raster_bounds.xMaximum() + max_radius) | ||
| self.raster_bounds.setYMaximum(self.raster_bounds.yMaximum() + max_radius) | ||
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| self.pixelSizeChanged() | ||
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| def pixelSizeChanged(self): | ||
| cell_size = self.mCellXSpinBox.value() | ||
| if cell_size <= 0: | ||
| return | ||
| self.mCellYSpinBox.blockSignals(True) | ||
| self.mCellYSpinBox.setValue(cell_size) | ||
| self.mCellYSpinBox.blockSignals(False) | ||
| rows = max(round(self.raster_bounds.height() / cell_size) + 1, 1) | ||
| cols = max(round(self.raster_bounds.width() / cell_size) + 1, 1) | ||
| self.mRowsSpinBox.blockSignals(True) | ||
| self.mRowsSpinBox.setValue(rows) | ||
| self.mRowsSpinBox.blockSignals(False) | ||
| self.mColumnsSpinBox.blockSignals(True) | ||
| self.mColumnsSpinBox.setValue(cols) | ||
| self.mColumnsSpinBox.blockSignals(False) | ||
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| def rowsChanged(self): | ||
| rows = self.mRowsSpinBox.value() | ||
| if rows <= 0: | ||
| return | ||
| cell_size = self.raster_bounds.height() / rows | ||
| cols = max(round(self.raster_bounds.width() / cell_size) + 1, 1) | ||
| self.mColumnsSpinBox.blockSignals(True) | ||
| self.mColumnsSpinBox.setValue(cols) | ||
| self.mColumnsSpinBox.blockSignals(False) | ||
| for w in [self.mCellXSpinBox, self.mCellYSpinBox]: | ||
| w.blockSignals(True) | ||
| w.setValue(cell_size) | ||
| w.blockSignals(False) | ||
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| def columnsChanged(self): | ||
| cols = self.mColumnsSpinBox.value() | ||
| if cols < 2: | ||
| return | ||
| cell_size = self.raster_bounds.width() / (cols - 1) | ||
| rows = max(round(self.raster_bounds.height() / cell_size), 1) | ||
| self.mRowsSpinBox.blockSignals(True) | ||
| self.mRowsSpinBox.setValue(rows) | ||
| self.mRowsSpinBox.blockSignals(False) | ||
| for w in [self.mCellXSpinBox, self.mCellYSpinBox]: | ||
| w.blockSignals(True) | ||
| w.setValue(cell_size) | ||
| w.blockSignals(False) | ||
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| def setValue(self, value): | ||
| try: | ||
| numeric_value = float(value) | ||
| except: | ||
| return False | ||
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| self.mCellXSpinBox.setValue(numeric_value) | ||
| self.mCellYSpinBox.setValue(numeric_value) | ||
| return True | ||
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| def value(self): | ||
| return self.mCellXSpinBox.value() | ||
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| class HeatmapPixelSizeWidgetWrapper(WidgetWrapper): | ||
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| def _panel(self): | ||
| return HeatmapPixelSizeWidget() | ||
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| def createWidget(self): | ||
| if self.dialogType == DIALOG_STANDARD: | ||
| return self._panel() | ||
| else: | ||
| w = QgsDoubleSpinBox() | ||
| w.setShowClearButton(False) | ||
| w.setMinimum(0) | ||
| w.setMaximum(99999999999) | ||
| w.setDecimals(6) | ||
| w.setTooltip(self.tr('Resolution of each pixel in output raster, in layer units')) | ||
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| def postInitialize(self, wrappers): | ||
| if self.dialogType != DIALOG_STANDARD: | ||
| return | ||
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| for wrapper in wrappers: | ||
| if wrapper.param.name == self.param.parent_layer: | ||
| self.setLayer(wrapper.value()) | ||
| wrapper.widgetValueHasChanged.connect(self.parentLayerChanged) | ||
| elif wrapper.param.name == self.param.radius_param: | ||
| self.setRadius(wrapper.value()) | ||
| wrapper.widgetValueHasChanged.connect(self.radiusChanged) | ||
| elif wrapper.param.name == self.param.radius_field_param: | ||
| self.setLayer(wrapper.value()) | ||
| wrapper.widgetValueHasChanged.connect(self.radiusFieldChanged) | ||
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| def parentLayerChanged(self, wrapper): | ||
| self.setLayer(wrapper.value()) | ||
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| def setLayer(self, layer): | ||
| if isinstance(layer, str): | ||
| layer = dataobjects.getObjectFromUri(_resolveLayers(layer)) | ||
| self.widget.setLayer(layer) | ||
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| def radiusChanged(self, wrapper): | ||
| self.setRadius(wrapper.value()) | ||
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| def setRadius(self, radius): | ||
| self.widget.setRadius(radius) | ||
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| def radiusFieldChanged(self, wrapper): | ||
| self.setRadiusField(wrapper.value()) | ||
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| def setRadiusField(self, radius_field): | ||
| self.widget.setRadiusField(radius_field) | ||
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| def setValue(self, value): | ||
| return self.widget.setValue(value) | ||
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| def value(self): | ||
| return self.widget.value() |
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