本文整理汇总了Python中qgis.core.QgsSymbolLayerV2Utils.pixelSizeScaleFactor方法的典型用法代码示例。如果您正苦于以下问题：Python QgsSymbolLayerV2Utils.pixelSizeScaleFactor方法的具体用法？Python QgsSymbolLayerV2Utils.pixelSizeScaleFactor怎么用？Python QgsSymbolLayerV2Utils.pixelSizeScaleFactor使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类qgis.core.QgsSymbolLayerV2Utils的用法示例。
在下文中一共展示了QgsSymbolLayerV2Utils.pixelSizeScaleFactor方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: testPixelSizeScaleFactor
# 需要导入模块: from qgis.core import QgsSymbolLayerV2Utils [as 别名]
# 或者: from qgis.core.QgsSymbolLayerV2Utils import pixelSizeScaleFactor [as 别名]
def testPixelSizeScaleFactor(self):
# test QgsSymbolLayerV2Utils::pixelSizeScaleFactor() 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
# start with no min/max scale
c = QgsMapUnitScale()
sf = QgsSymbolLayerV2Utils.pixelSizeScaleFactor(r, QgsSymbolV2.MapUnit, c)
self.assertAlmostEqual(sf, 0.5, places=5)
sf = QgsSymbolLayerV2Utils.pixelSizeScaleFactor(r, QgsSymbolV2.MM, c)
self.assertAlmostEqual(sf, 11.8110236, places=5)
sf = QgsSymbolLayerV2Utils.pixelSizeScaleFactor(r, QgsSymbolV2.Pixel, c)
self.assertAlmostEqual(sf, 1.0, places=5)
# minimum scale greater than the renderer scale, so should be limited to minScale
c.minScale = 1 / 150000000.0
sf = QgsSymbolLayerV2Utils.pixelSizeScaleFactor(r, QgsSymbolV2.MapUnit, c)
self.assertAlmostEqual(sf, 3.8925045, places=5)
# only conversion from mapunits should be affected
sf = QgsSymbolLayerV2Utils.pixelSizeScaleFactor(r, QgsSymbolV2.MM, c)
self.assertAlmostEqual(sf, 11.811023, places=5)
sf = QgsSymbolLayerV2Utils.pixelSizeScaleFactor(r, QgsSymbolV2.Pixel, 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 = 1 / 350000000.0
sf = QgsSymbolLayerV2Utils.pixelSizeScaleFactor(r, QgsSymbolV2.MapUnit, c)
self.assertAlmostEqual(sf, 0.5, places=5)
# only conversion from mapunits should be affected
sf = QgsSymbolLayerV2Utils.pixelSizeScaleFactor(r, QgsSymbolV2.MM, c)
self.assertAlmostEqual(sf, 11.8110236, places=5)
sf = QgsSymbolLayerV2Utils.pixelSizeScaleFactor(r, QgsSymbolV2.Pixel, c)
self.assertAlmostEqual(sf, 1.0, places=5)