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Add simple line custom dash pattern tests
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nirvn committed Apr 28, 2019
1 parent c547fc6 commit 472ab77
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76 changes: 76 additions & 0 deletions tests/src/python/test_qgslinesymbollayers.py
Expand Up @@ -90,6 +90,82 @@ def testSimpleLineWithOffset(self):

self.assertTrue(self.imageCheck('symbol_layer', 'simpleline_offset', image))

def testSimpleLineWithCustomDashPattern(self):
""" test that rendering a simple line symbol with custom dash pattern"""
layer = QgsSimpleLineSymbolLayer(QColor(0, 0, 0))
layer.setWidth(0.5)
layer.setCustomDashVector([2, 5])
layer.setUseCustomDashPattern(True)

symbol = QgsLineSymbol()
symbol.changeSymbolLayer(0, layer)

image = QImage(200, 200, QImage.Format_RGB32)
painter = QPainter()
ms = QgsMapSettings()

geom = QgsGeometry.fromWkt('LineString (0 0, 10 0, 10 10, 0 10, 0 0)')
f = QgsFeature()
f.setGeometry(geom)

extent = geom.constGet().boundingBox()
# buffer extent by 10%
extent = extent.buffered((extent.height() + extent.width()) / 20.0)

ms.setExtent(extent)
ms.setOutputSize(image.size())
context = QgsRenderContext.fromMapSettings(ms)
context.setPainter(painter)
context.setScaleFactor(96 / 25.4) # 96 DPI

painter.begin(image)
image.fill(QColor(255, 255, 255))

symbol.startRender(context)
symbol.renderFeature(f, context)
symbol.stopRender(context)
painter.end()

self.assertTrue(self.imageCheck('symbol_layer_simpleline_customdashpattern', 'simpleline_customdashpattern', image))

def testSimpleLineWithCustomDashPatternHairline(self):
""" test that rendering a simple line symbol with custom dash pattern"""
layer = QgsSimpleLineSymbolLayer(QColor(0, 0, 0))
layer.setWidth(0)
layer.setCustomDashVector([3, 3, 2, 2])
layer.setUseCustomDashPattern(True)

symbol = QgsLineSymbol()
symbol.changeSymbolLayer(0, layer)

image = QImage(200, 200, QImage.Format_RGB32)
painter = QPainter()
ms = QgsMapSettings()

geom = QgsGeometry.fromWkt('LineString (0 0, 10 0, 10 10, 0 10, 0 0)')
f = QgsFeature()
f.setGeometry(geom)

extent = geom.constGet().boundingBox()
# buffer extent by 10%
extent = extent.buffered((extent.height() + extent.width()) / 20.0)

ms.setExtent(extent)
ms.setOutputSize(image.size())
context = QgsRenderContext.fromMapSettings(ms)
context.setPainter(painter)
context.setScaleFactor(96 / 25.4) # 96 DPI

painter.begin(image)
image.fill(QColor(255, 255, 255))

symbol.startRender(context)
symbol.renderFeature(f, context)
symbol.stopRender(context)
painter.end()

self.assertTrue(self.imageCheck('symbol_layer_simpleline_customdashpattern_hairline', 'simpleline_customdashpattern_hairline', image))


if __name__ == '__main__':
unittest.main()
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