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test_qgsrendercontext.py
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test_qgsrendercontext.py
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# -*- coding: utf-8 -*-
"""QGIS Unit tests for QgsRenderContext.
.. note:: 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__ = '16/01/2017'
__copyright__ = 'Copyright 2017, The QGIS Project'
# This will get replaced with a git SHA1 when you do a git archive
__revision__ = '$Format:%H$'
import qgis # NOQA
from qgis.core import (QgsRenderContext,
QgsMapSettings,
QgsDistanceArea,
QgsRectangle, QgsPointXY,
QgsCoordinateReferenceSystem,
QgsMapUnitScale,
QgsUnitTypes,
QgsProject)
from qgis.PyQt.QtCore import QSize
from qgis.PyQt.QtGui import QPainter, QImage
from qgis.testing import start_app, unittest
import math
# Convenience instances in case you may need them
# to find the srs.db
start_app()
class TestQgsRenderContext(unittest.TestCase):
def testGettersSetters(self):
"""
Basic getter/setter tests
"""
c = QgsRenderContext()
c.setTextRenderFormat(QgsRenderContext.TextFormatAlwaysText)
self.assertEqual(c.textRenderFormat(), QgsRenderContext.TextFormatAlwaysText)
c.setTextRenderFormat(QgsRenderContext.TextFormatAlwaysOutlines)
self.assertEqual(c.textRenderFormat(), QgsRenderContext.TextFormatAlwaysOutlines)
def testCopyConstructor(self):
"""
Test the copy constructor
"""
c1 = QgsRenderContext()
c1.setTextRenderFormat(QgsRenderContext.TextFormatAlwaysText)
c2 = QgsRenderContext(c1)
self.assertEqual(c2.textRenderFormat(), QgsRenderContext.TextFormatAlwaysText)
c1.setTextRenderFormat(QgsRenderContext.TextFormatAlwaysOutlines)
c2 = QgsRenderContext(c1)
self.assertEqual(c2.textRenderFormat(), QgsRenderContext.TextFormatAlwaysOutlines)
def testFromQPainter(self):
""" test QgsRenderContext.fromQPainter """
# no painter
c = QgsRenderContext.fromQPainter(None)
self.assertFalse(c.painter())
# assuming 88 dpi as fallback
self.assertAlmostEqual(c.scaleFactor(), 88 / 25.4, 3)
# no painter destination
p = QPainter()
c = QgsRenderContext.fromQPainter(p)
self.assertEqual(c.painter(), p)
self.assertEqual(c.testFlag(QgsRenderContext.Antialiasing), False)
self.assertAlmostEqual(c.scaleFactor(), 88 / 25.4, 3)
im = QImage(1000, 600, QImage.Format_RGB32)
dots_per_m = 300 / 25.4 * 1000 # 300 dpi to dots per m
im.setDotsPerMeterX(dots_per_m)
im.setDotsPerMeterY(dots_per_m)
p = QPainter(im)
p.setRenderHint(QPainter.Antialiasing)
c = QgsRenderContext.fromQPainter(p)
self.assertEqual(c.painter(), p)
self.assertEqual(c.testFlag(QgsRenderContext.Antialiasing), True)
self.assertAlmostEqual(c.scaleFactor(), dots_per_m / 1000, 3) # scaleFactor should be pixels/mm
def testFromMapSettings(self):
"""
test QgsRenderContext.fromMapSettings()
"""
ms = QgsMapSettings()
ms.setTextRenderFormat(QgsRenderContext.TextFormatAlwaysText)
rc = QgsRenderContext.fromMapSettings(ms)
self.assertEqual(rc.textRenderFormat(), QgsRenderContext.TextFormatAlwaysText)
ms.setTextRenderFormat(QgsRenderContext.TextFormatAlwaysOutlines)
rc = QgsRenderContext.fromMapSettings(ms)
self.assertEqual(rc.textRenderFormat(), QgsRenderContext.TextFormatAlwaysOutlines)
def testRenderMetersInMapUnits(self):
crs_wsg84 = QgsCoordinateReferenceSystem.fromOgcWmsCrs('EPSG:4326')
rt_extent = QgsRectangle(13.37768985634235, 52.51625705830762, 13.37771931686235, 52.51628651882762)
point_berlin_wsg84 = QgsPointXY(13.37770458660236, 52.51627178856762)
length_wsg84_mapunits = 0.00001473026350140572
meters_test = 2.40
da_wsg84 = QgsDistanceArea()
da_wsg84.setSourceCrs(crs_wsg84, QgsProject.instance().transformContext())
if (da_wsg84.sourceCrs().isGeographic()):
da_wsg84.setEllipsoid(da_wsg84.sourceCrs().ellipsoidAcronym())
length_meter_mapunits = da_wsg84.measureLineProjected(point_berlin_wsg84, 1.0, (math.pi / 2))
meters_test_mapunits = meters_test * length_wsg84_mapunits
meters_test_pixel = meters_test * length_wsg84_mapunits
ms = QgsMapSettings()
ms.setDestinationCrs(crs_wsg84)
ms.setExtent(rt_extent)
r = QgsRenderContext.fromMapSettings(ms)
r.setExtent(rt_extent)
self.assertEqual(r.extent().center().toString(7), point_berlin_wsg84.toString(7))
c = QgsMapUnitScale()
r.setDistanceArea(da_wsg84)
result_test_painterunits = r.convertToPainterUnits(meters_test, QgsUnitTypes.RenderMetersInMapUnits, c)
self.assertEqual(QgsDistanceArea.formatDistance(result_test_painterunits, 7, QgsUnitTypes.DistanceUnknownUnit, True), QgsDistanceArea.formatDistance(meters_test_mapunits, 7, QgsUnitTypes.DistanceUnknownUnit, True))
result_test_mapunits = r.convertToMapUnits(meters_test, QgsUnitTypes.RenderMetersInMapUnits, c)
self.assertEqual(QgsDistanceArea.formatDistance(result_test_mapunits, 7, QgsUnitTypes.DistanceDegrees, True), QgsDistanceArea.formatDistance(meters_test_mapunits, 7, QgsUnitTypes.DistanceDegrees, True))
result_test_meters = r.convertFromMapUnits(meters_test_mapunits, QgsUnitTypes.RenderMetersInMapUnits)
self.assertEqual(QgsDistanceArea.formatDistance(result_test_meters, 1, QgsUnitTypes.DistanceMeters, True), QgsDistanceArea.formatDistance(meters_test, 1, QgsUnitTypes.DistanceMeters, True))
def testConvertSingleUnit(self):
ms = QgsMapSettings()
ms.setExtent(QgsRectangle(0, 0, 100, 100))
ms.setOutputSize(QSize(100, 50))
ms.setOutputDpi(300)
r = QgsRenderContext.fromMapSettings(ms)
# renderer scale should be about 1:291937841
# start with no min/max scale
c = QgsMapUnitScale()
#self.assertEqual(r.scaleFactor(),666)
sf = r.convertToPainterUnits(1, QgsUnitTypes.RenderMapUnits, c)
self.assertAlmostEqual(sf, 0.5, places=5)
sf = r.convertToPainterUnits(1, QgsUnitTypes.RenderMillimeters, c)
self.assertAlmostEqual(sf, 11.8110236, places=5)
sf = r.convertToPainterUnits(1, QgsUnitTypes.RenderPoints, c)
self.assertAlmostEqual(sf, 4.166666665625, places=5)
sf = r.convertToPainterUnits(1, QgsUnitTypes.RenderInches, c)
self.assertAlmostEqual(sf, 300.0, places=5)
sf = r.convertToPainterUnits(1, QgsUnitTypes.RenderPixels, c)
self.assertAlmostEqual(sf, 1.0, places=5)
# minimum scale greater than the renderer scale, so should be limited to minScale
c.minScale = 150000000.0
sf = r.convertToPainterUnits(1, QgsUnitTypes.RenderMapUnits, c)
self.assertAlmostEqual(sf, 3.89250455, places=5)
# only conversion from mapunits should be affected
sf = r.convertToPainterUnits(1, QgsUnitTypes.RenderMillimeters, c)
self.assertAlmostEqual(sf, 11.8110236, places=5)
sf = r.convertToPainterUnits(1, QgsUnitTypes.RenderPoints, c)
self.assertAlmostEqual(sf, 4.166666665625, places=5)
sf = r.convertToPainterUnits(1, QgsUnitTypes.RenderInches, c)
self.assertAlmostEqual(sf, 300.0, places=5)
sf = r.convertToPainterUnits(1, QgsUnitTypes.RenderPixels, c)
self.assertAlmostEqual(sf, 1.0, places=5)
c.minScale = 0
# maximum scale less than the renderer scale, so should be limited to maxScale
c.maxScale = 350000000.0
sf = r.convertToPainterUnits(1, QgsUnitTypes.RenderMapUnits, c)
self.assertAlmostEqual(sf, 0.5, places=5)
# only conversion from mapunits should be affected
sf = r.convertToPainterUnits(1, QgsUnitTypes.RenderMillimeters, c)
self.assertAlmostEqual(sf, 11.8110236, places=5)
sf = r.convertToPainterUnits(1, QgsUnitTypes.RenderPoints, c)
self.assertAlmostEqual(sf, 4.166666665625, places=5)
sf = r.convertToPainterUnits(1, QgsUnitTypes.RenderInches, c)
self.assertAlmostEqual(sf, 300.0, places=5)
sf = r.convertToPainterUnits(1, QgsUnitTypes.RenderPixels, c)
self.assertAlmostEqual(sf, 1.0, places=5)
def testConvertToPainterUnits(self):
ms = QgsMapSettings()
ms.setExtent(QgsRectangle(0, 0, 100, 100))
ms.setOutputSize(QSize(100, 50))
ms.setOutputDpi(300)
r = QgsRenderContext.fromMapSettings(ms)
# renderer scale should be about 1:291937841
# start with no min/max scale
c = QgsMapUnitScale()
size = r.convertToPainterUnits(2, QgsUnitTypes.RenderMapUnits, c)
self.assertAlmostEqual(size, 1.0, places=5)
size = r.convertToPainterUnits(2, QgsUnitTypes.RenderMillimeters, c)
self.assertAlmostEqual(size, 23.622047, places=5)
size = r.convertToPainterUnits(2, QgsUnitTypes.RenderPoints, c)
self.assertAlmostEqual(size, 8.33333333125, places=5)
size = r.convertToPainterUnits(2, QgsUnitTypes.RenderInches, c)
self.assertAlmostEqual(size, 600.0, places=5)
size = r.convertToPainterUnits(2, QgsUnitTypes.RenderPixels, c)
self.assertAlmostEqual(size, 2.0, places=5)
# minimum size greater than the calculated size, so size should be limited to minSizeMM
c.minSizeMM = 5
c.minSizeMMEnabled = True
size = r.convertToPainterUnits(2, QgsUnitTypes.RenderMapUnits, c)
self.assertAlmostEqual(size, 59.0551181, places=5)
# only conversion from mapunits should be affected
size = r.convertToPainterUnits(2, QgsUnitTypes.RenderMillimeters, c)
self.assertAlmostEqual(size, 23.622047, places=5)
size = r.convertToPainterUnits(2, QgsUnitTypes.RenderPoints, c)
self.assertAlmostEqual(size, 8.33333333125, places=5)
size = r.convertToPainterUnits(2, QgsUnitTypes.RenderInches, c)
self.assertAlmostEqual(size, 600.0, places=5)
size = r.convertToPainterUnits(2, QgsUnitTypes.RenderPixels, c)
self.assertAlmostEqual(size, 2.0, places=5)
c.minSizeMMEnabled = False
# maximum size less than the calculated size, so size should be limited to maxSizeMM
c.maxSizeMM = 0.1
c.maxSizeMMEnabled = True
size = r.convertToPainterUnits(2, QgsUnitTypes.RenderMapUnits, c)
self.assertAlmostEqual(size, 1.0, places=5)
# only conversion from mapunits should be affected
size = r.convertToPainterUnits(2, QgsUnitTypes.RenderMillimeters, c)
self.assertAlmostEqual(size, 23.622047, places=5)
size = r.convertToPainterUnits(2, QgsUnitTypes.RenderPoints, c)
self.assertAlmostEqual(size, 8.33333333125, places=5)
size = r.convertToPainterUnits(2, QgsUnitTypes.RenderInches, c)
self.assertAlmostEqual(size, 600.0, places=5)
size = r.convertToPainterUnits(2, QgsUnitTypes.RenderPixels, c)
self.assertAlmostEqual(size, 2.0, places=5)
def testConvertToMapUnits(self):
ms = QgsMapSettings()
ms.setExtent(QgsRectangle(0, 0, 100, 100))
ms.setOutputSize(QSize(100, 50))
ms.setOutputDpi(300)
r = QgsRenderContext.fromMapSettings(ms)
# renderer scale should be about 1:291937841
# start with no min/max scale
c = QgsMapUnitScale()
size = r.convertToMapUnits(2, QgsUnitTypes.RenderMapUnits, c)
self.assertEqual(size, 2.0)
size = r.convertToMapUnits(2, QgsUnitTypes.RenderMillimeters, c)
self.assertAlmostEqual(size, 47.244094, places=5)
size = r.convertToMapUnits(5.66929, QgsUnitTypes.RenderPoints, c)
self.assertAlmostEqual(size, 47.2440833, places=5)
size = r.convertToMapUnits(5.66929, QgsUnitTypes.RenderInches, c)
self.assertAlmostEqual(size, 3401.574, places=5)
size = r.convertToMapUnits(2, QgsUnitTypes.RenderPixels, c)
self.assertAlmostEqual(size, 4.0, places=5)
# minimum size greater than the calculated size, so size should be limited to minSizeMM
c.minSizeMM = 5
c.minSizeMMEnabled = True
size = r.convertToMapUnits(2, QgsUnitTypes.RenderMapUnits, c)
self.assertAlmostEqual(size, 118.1102362, places=5)
# only conversion from mapunits should be affected
size = r.convertToMapUnits(2, QgsUnitTypes.RenderMillimeters, c)
self.assertAlmostEqual(size, 47.244094, places=5)
size = r.convertToMapUnits(5.66929, QgsUnitTypes.RenderPoints, c)
self.assertAlmostEqual(size, 47.2440833, places=5)
size = r.convertToMapUnits(5.66929, QgsUnitTypes.RenderInches, c)
self.assertAlmostEqual(size, 3401.574, places=5)
size = r.convertToMapUnits(2, QgsUnitTypes.RenderPixels, c)
self.assertAlmostEqual(size, 4.0, places=5)
c.minSizeMMEnabled = False
# maximum size less than the calculated size, so size should be limited to maxSizeMM
c.maxSizeMM = 0.05
c.maxSizeMMEnabled = True
size = r.convertToMapUnits(2, QgsUnitTypes.RenderMapUnits, c)
self.assertAlmostEqual(size, 1.1811023622047245, places=5)
# only conversion from mapunits should be affected
size = r.convertToMapUnits(2, QgsUnitTypes.RenderMillimeters, c)
self.assertAlmostEqual(size, 47.244094, places=5)
size = r.convertToMapUnits(5.66929, QgsUnitTypes.RenderPoints, c)
self.assertAlmostEqual(size, 47.2440833, places=5)
size = r.convertToMapUnits(5.66929, QgsUnitTypes.RenderInches, c)
self.assertAlmostEqual(size, 3401.574, places=5)
size = r.convertToMapUnits(2, QgsUnitTypes.RenderPixels, c)
self.assertAlmostEqual(size, 4.0, places=5)
c.maxSizeMMEnabled = False
# test with minimum scale set
c.minScale = 150000000.0
size = r.convertToMapUnits(2, QgsUnitTypes.RenderMapUnits, c)
self.assertAlmostEqual(size, 15.57001821, places=5)
# only conversion from mapunits should be affected
size = r.convertToMapUnits(2, QgsUnitTypes.RenderMillimeters, c)
self.assertAlmostEqual(size, 47.244094, places=5)
size = r.convertToMapUnits(5.66929, QgsUnitTypes.RenderPoints, c)
self.assertAlmostEqual(size, 47.2440833, places=5)
size = r.convertToMapUnits(5.66929, QgsUnitTypes.RenderInches, c)
self.assertAlmostEqual(size, 3401.574, places=5)
size = r.convertToMapUnits(2, QgsUnitTypes.RenderPixels, c)
self.assertAlmostEqual(size, 4.0, places=5)
c.minScale = 0
# test with maximum scale set
c.maxScale = 1550000000.0
size = r.convertToMapUnits(2, QgsUnitTypes.RenderMapUnits, c)
self.assertAlmostEqual(size, 1.50677595625, places=5)
# only conversion from mapunits should be affected
size = r.convertToMapUnits(2, QgsUnitTypes.RenderMillimeters, c)
self.assertAlmostEqual(size, 47.244094, places=5)
size = r.convertToMapUnits(5.66929, QgsUnitTypes.RenderPoints, c)
self.assertAlmostEqual(size, 47.2440833, places=5)
size = r.convertToMapUnits(5.66929, QgsUnitTypes.RenderInches, c)
self.assertAlmostEqual(size, 3401.574, places=5)
size = r.convertToMapUnits(2, QgsUnitTypes.RenderPixels, c)
self.assertAlmostEqual(size, 4.0, places=5)
c.maxScale = 0
def testPixelSizeScaleFactor(self):
ms = QgsMapSettings()
ms.setExtent(QgsRectangle(0, 0, 100, 100))
ms.setOutputSize(QSize(100, 50))
ms.setOutputDpi(300)
r = QgsRenderContext.fromMapSettings(ms)
# renderer scale should be about 1:291937841
# start with no min/max scale
c = QgsMapUnitScale()
sf = r.convertToPainterUnits(1, QgsUnitTypes.RenderMapUnits, c)
self.assertAlmostEqual(sf, 0.5, places=5)
sf = r.convertToPainterUnits(1, QgsUnitTypes.RenderMillimeters, c)
self.assertAlmostEqual(sf, 11.8110236, places=5)
sf = r.convertToPainterUnits(1, QgsUnitTypes.RenderPoints, c)
self.assertAlmostEqual(sf, 4.166666665625, places=5)
sf = r.convertToPainterUnits(1, QgsUnitTypes.RenderInches, c)
self.assertAlmostEqual(sf, 300.0, places=5)
sf = r.convertToPainterUnits(1, QgsUnitTypes.RenderPixels, c)
self.assertAlmostEqual(sf, 1.0, places=5)
# minimum scale greater than the renderer scale, so should be limited to minScale
c.minScale = 150000000.0
sf = r.convertToPainterUnits(1, QgsUnitTypes.RenderMapUnits, c)
self.assertAlmostEqual(sf, 3.8925045, places=5)
# only conversion from mapunits should be affected
sf = r.convertToPainterUnits(1, QgsUnitTypes.RenderMillimeters, c)
self.assertAlmostEqual(sf, 11.811023, places=5)
sf = r.convertToPainterUnits(1, QgsUnitTypes.RenderPoints, c)
self.assertAlmostEqual(sf, 4.166666665625, places=5)
sf = r.convertToPainterUnits(1, QgsUnitTypes.RenderInches, c)
self.assertAlmostEqual(sf, 300.0, places=5)
sf = r.convertToPainterUnits(1, QgsUnitTypes.RenderPixels, c)
self.assertAlmostEqual(sf, 1.0, places=5)
c.minScale = 0
# maximum scale less than the renderer scale, so should be limited to maxScale
c.maxScale = 350000000.0
sf = r.convertToPainterUnits(1, QgsUnitTypes.RenderMapUnits, c)
self.assertAlmostEqual(sf, 0.5, places=5)
# only conversion from mapunits should be affected
sf = r.convertToPainterUnits(1, QgsUnitTypes.RenderMillimeters, c)
self.assertAlmostEqual(sf, 11.8110236, places=5)
sf = r.convertToPainterUnits(1, QgsUnitTypes.RenderPoints, c)
self.assertAlmostEqual(sf, 4.166666665625, places=5)
sf = r.convertToPainterUnits(1, QgsUnitTypes.RenderInches, c)
self.assertAlmostEqual(sf, 300.0, places=5)
sf = r.convertToPainterUnits(1, QgsUnitTypes.RenderPixels, c)
self.assertAlmostEqual(sf, 1.0, places=5)
def testMapUnitScaleFactor(self):
# test QgsSymbolLayerUtils::mapUnitScaleFactor() using QgsMapUnitScale
ms = QgsMapSettings()
ms.setExtent(QgsRectangle(0, 0, 100, 100))
ms.setOutputSize(QSize(100, 50))
ms.setOutputDpi(300)
r = QgsRenderContext.fromMapSettings(ms)
# renderer scale should be about 1:291937841
c = QgsMapUnitScale()
sf = r.convertToMapUnits(1, QgsUnitTypes.RenderMapUnits, c)
self.assertAlmostEqual(sf, 1.0, places=5)
sf = r.convertToMapUnits(1, QgsUnitTypes.RenderMillimeters, c)
self.assertAlmostEqual(sf, 23.622047, places=5)
sf = r.convertToMapUnits(1, QgsUnitTypes.RenderPoints, c)
self.assertAlmostEqual(sf, 8.33333324723, places=5)
sf = r.convertToMapUnits(1, QgsUnitTypes.RenderInches, c)
self.assertAlmostEqual(sf, 600.0, places=5)
sf = r.convertToMapUnits(1, QgsUnitTypes.RenderPixels, c)
self.assertAlmostEqual(sf, 2.0, places=5)
if __name__ == '__main__':
unittest.main()