本文整理汇总了Python中qgis.core.QgsCategorizedSymbolRenderer.legendKeysForFeature方法的典型用法代码示例。如果您正苦于以下问题：Python QgsCategorizedSymbolRenderer.legendKeysForFeature方法的具体用法？Python QgsCategorizedSymbolRenderer.legendKeysForFeature怎么用？Python QgsCategorizedSymbolRenderer.legendKeysForFeature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.QgsCategorizedSymbolRenderer的用法示例。
在下文中一共展示了QgsCategorizedSymbolRenderer.legendKeysForFeature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: testLegendKeysWhileCounting
# 需要导入模块: from qgis.core import QgsCategorizedSymbolRenderer [as 别名]
# 或者: from qgis.core.QgsCategorizedSymbolRenderer import legendKeysForFeature [as 别名]
def testLegendKeysWhileCounting(self):
# test determining legend keys for features, while counting features
fields = QgsFields()
fields.append(QgsField('x'))
# setup renderer
renderer = QgsCategorizedSymbolRenderer()
renderer.setClassAttribute('x')
symbol_a = createMarkerSymbol()
symbol_a.setColor(QColor(255, 0, 0))
renderer.addCategory(QgsRendererCategory('a', symbol_a, 'a'))
symbol_b = createMarkerSymbol()
symbol_b.setColor(QColor(0, 255, 0))
renderer.addCategory(QgsRendererCategory('b', symbol_b, 'b'))
symbol_c = createMarkerSymbol()
symbol_c.setColor(QColor(0, 0, 255))
renderer.addCategory(QgsRendererCategory('c', symbol_c, 'c', False))
# add default category
default_symbol = createMarkerSymbol()
default_symbol.setColor(QColor(255, 255, 255))
renderer.addCategory(QgsRendererCategory('', default_symbol, 'default'))
context = QgsRenderContext()
context.setRendererScale(0) # simulate counting
renderer.startRender(context, fields)
f = QgsFeature(fields)
f.setAttributes(['a'])
keys = renderer.legendKeysForFeature(f, context)
self.assertEqual(keys, {'0'})
f.setAttributes(['b'])
keys = renderer.legendKeysForFeature(f, context)
self.assertEqual(keys, {'1'})
# hidden category, should still return keys
f.setAttributes(['c'])
keys = renderer.legendKeysForFeature(f, context)
self.assertEqual(keys, {'2'})
# no matching category
f.setAttributes(['xxx'])
keys = renderer.legendKeysForFeature(f, context)
self.assertFalse(keys)
renderer.stopRender(context)