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test_qgssimplefillsymbollayer.py
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"""
***************************************************************************
test_qgssimplefillsymbollayer.py
---------------------
Date : November 2018
Copyright : (C) 2018 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. *
* *
***************************************************************************
"""
__author__ = 'Nyall Dawson'
__date__ = 'September 2020'
__copyright__ = '(C) 2020, Nyall Dawson'
import os
from qgis.PyQt.QtCore import QDir, QPointF, QSize, Qt
from qgis.PyQt.QtGui import QColor, QImage, QPainter
from qgis.core import (
QgsFeature,
QgsFillSymbol,
QgsGeometry,
QgsMapSettings,
QgsProperty,
QgsRectangle,
QgsRenderContext,
QgsSimpleFillSymbolLayer,
QgsSingleSymbolRenderer,
QgsSymbol,
QgsSymbolLayer,
QgsVectorLayer,
)
import unittest
from qgis.testing import start_app, QgisTestCase
from utilities import unitTestDataPath
start_app()
TEST_DATA_DIR = unitTestDataPath()
class TestQgsSimpleFillSymbolLayer(QgisTestCase):
@classmethod
def control_path_prefix(cls):
return "symbol_simplefill"
def testRender(self):
# rendering test
s = QgsFillSymbol.createSimple({'outline_color': '#ff0000', 'outline_width': '2', 'color': '#ff5588'})
g = QgsGeometry.fromWkt('Polygon((0 0, 10 0, 10 10, 0 0))')
rendered_image = self.renderGeometry(s, g)
self.assertTrue(
self.image_check('simplefill_render', 'simplefill_render', rendered_image)
)
def testRenderWithOffset(self):
# rendering test with offset
s = QgsFillSymbol.createSimple({'outline_color': '#ff0000', 'outline_width': '2', 'color': '#ff5588'})
s[0].setOffset(QPointF(5, 3))
g = QgsGeometry.fromWkt('Polygon((0 0, 10 0, 10 10, 0 0))')
rendered_image = self.renderGeometry(s, g)
self.assertTrue(
self.image_check('simplefill_offset', 'simplefill_offset', rendered_image)
)
def testDataDefinedOffset(self):
""" test that rendering a fill symbol with data defined offset works"""
polys_shp = os.path.join(TEST_DATA_DIR, 'polys.shp')
polys_layer = QgsVectorLayer(polys_shp, 'Polygons', 'ogr')
# lets render two layers, to make comparison easier
layer = QgsSimpleFillSymbolLayer()
layer.setStrokeStyle(Qt.NoPen)
layer.setColor(QColor(200, 250, 50))
symbol = QgsFillSymbol()
symbol.changeSymbolLayer(0, layer)
layer = QgsSimpleFillSymbolLayer()
layer.setDataDefinedProperty(QgsSymbolLayer.PropertyOffset, QgsProperty.fromExpression("array(-(x_min($geometry)+100)/5, (y_min($geometry)-35)/5)"))
layer.setStrokeStyle(Qt.NoPen)
layer.setColor(QColor(100, 150, 150))
symbol.appendSymbolLayer(layer)
polys_layer.setRenderer(QgsSingleSymbolRenderer(symbol))
ms = QgsMapSettings()
ms.setOutputSize(QSize(400, 400))
ms.setOutputDpi(96)
ms.setExtent(QgsRectangle(-133, 22, -70, 52))
ms.setLayers([polys_layer])
# Test rendering
self.assertTrue(
self.render_map_settings_check('simplefill_ddoffset', 'simplefill_ddoffset', ms)
)
def testOpacityWithDataDefinedColor(self):
poly_shp = os.path.join(TEST_DATA_DIR, 'polys.shp')
poly_layer = QgsVectorLayer(poly_shp, 'Polys', 'ogr')
self.assertTrue(poly_layer.isValid())
layer = QgsSimpleFillSymbolLayer()
layer.setStrokeStyle(Qt.NoPen)
layer.setColor(QColor(200, 250, 50))
layer.setDataDefinedProperty(QgsSymbolLayer.PropertyFillColor, QgsProperty.fromExpression(
"if(Name='Dam', 'red', 'green')"))
layer.setDataDefinedProperty(QgsSymbolLayer.PropertyStrokeColor, QgsProperty.fromExpression(
"if(Name='Dam', 'magenta', 'blue')"))
symbol = QgsFillSymbol()
symbol.changeSymbolLayer(0, layer)
symbol.setOpacity(0.5)
poly_layer.setRenderer(QgsSingleSymbolRenderer(symbol))
ms = QgsMapSettings()
ms.setOutputSize(QSize(400, 400))
ms.setOutputDpi(96)
ms.setExtent(QgsRectangle(-118.5, 19.0, -81.4, 50.4))
ms.setLayers([poly_layer])
# Test rendering
self.assertTrue(
self.render_map_settings_check('simplefill_opacityddcolor', 'simplefill_opacityddcolor', ms)
)
def testDataDefinedOpacity(self):
poly_shp = os.path.join(TEST_DATA_DIR, 'polys.shp')
poly_layer = QgsVectorLayer(poly_shp, 'Polys', 'ogr')
self.assertTrue(poly_layer.isValid())
layer = QgsSimpleFillSymbolLayer()
layer.setStrokeStyle(Qt.NoPen)
layer.setColor(QColor(200, 250, 50))
layer.setDataDefinedProperty(QgsSymbolLayer.PropertyFillColor, QgsProperty.fromExpression(
"if(Name='Dam', 'red', 'green')"))
layer.setDataDefinedProperty(QgsSymbolLayer.PropertyStrokeColor, QgsProperty.fromExpression(
"if(Name='Dam', 'magenta', 'blue')"))
symbol = QgsFillSymbol()
symbol.changeSymbolLayer(0, layer)
symbol.setDataDefinedProperty(QgsSymbol.PropertyOpacity, QgsProperty.fromExpression("if(\"Value\" >10, 25, 50)"))
poly_layer.setRenderer(QgsSingleSymbolRenderer(symbol))
ms = QgsMapSettings()
ms.setOutputSize(QSize(400, 400))
ms.setOutputDpi(96)
ms.setExtent(QgsRectangle(-118.5, 19.0, -81.4, 50.4))
ms.setLayers([poly_layer])
# Test rendering
self.assertTrue(
self.render_map_settings_check('simplefill_ddopacity', 'simplefill_ddopacity', ms)
)
def renderGeometry(self, symbol, geom):
f = QgsFeature()
f.setGeometry(geom)
image = QImage(200, 200, QImage.Format_RGB32)
painter = QPainter()
ms = QgsMapSettings()
extent = geom.get().boundingBox()
# buffer extent by 10%
if extent.width() > 0:
extent = extent.buffered((extent.height() + extent.width()) / 20.0)
else:
extent = extent.buffered(10)
ms.setExtent(extent)
ms.setOutputSize(image.size())
context = QgsRenderContext.fromMapSettings(ms)
context.setPainter(painter)
context.setScaleFactor(96 / 25.4) # 96 DPI
painter.begin(image)
try:
image.fill(QColor(0, 0, 0))
symbol.startRender(context)
symbol.renderFeature(f, context)
symbol.stopRender(context)
finally:
painter.end()
return image
if __name__ == '__main__':
unittest.main()