本文整理汇总了Python中qgis.core.QgsMapRendererCache.dependentLayers方法的典型用法代码示例。如果您正苦于以下问题：Python QgsMapRendererCache.dependentLayers方法的具体用法？Python QgsMapRendererCache.dependentLayers怎么用？Python QgsMapRendererCache.dependentLayers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.QgsMapRendererCache的用法示例。
在下文中一共展示了QgsMapRendererCache.dependentLayers方法的3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: testDependentLayers
# 需要导入模块: from qgis.core import QgsMapRendererCache [as 别名]
# 或者: from qgis.core.QgsMapRendererCache import dependentLayers [as 别名]
def testDependentLayers(self):
# bad layer tests
cache = QgsMapRendererCache()
self.assertEqual(cache.dependentLayers('not a layer'), [])
layer1 = QgsVectorLayer("Point?field=fldtxt:string",
"layer1", "memory")
layer2 = QgsVectorLayer("Point?field=fldtxt:string",
"layer2", "memory")
im = QImage(200, 200, QImage.Format_RGB32)
cache.setCacheImage('no depends', im, [])
self.assertEqual(cache.dependentLayers('no depends'), [])
cache.setCacheImage('depends', im, [layer1, layer2])
self.assertEqual(set(cache.dependentLayers('depends')), set([layer1, layer2]))示例2: checkAddingNewLabeledLayerInvalidatesLabelCache
# 需要导入模块: from qgis.core import QgsMapRendererCache [as 别名]
# 或者: from qgis.core.QgsMapRendererCache import dependentLayers [as 别名]
def checkAddingNewLabeledLayerInvalidatesLabelCache(self, job_type):
""" adding a new labeled layer should invalidate any previous label caches"""
layer = QgsVectorLayer("Point?field=fldtxt:string",
"layer1", "memory")
layer.setCustomProperty("labeling", "pal")
layer.setCustomProperty("labeling/enabled", True)
layer.setCustomProperty("labeling/fieldName", "fldtxt")
settings = QgsMapSettings()
settings.setExtent(QgsRectangle(5, 25, 25, 45))
settings.setOutputSize(QSize(600, 400))
settings.setLayers([layer])
# with cache - first run should populate cache
cache = QgsMapRendererCache()
job = job_type(settings)
job.setCache(cache)
job.start()
job.waitForFinished()
self.assertFalse(job.usedCachedLabels())
self.assertTrue(cache.hasCacheImage('_labels_'))
self.assertTrue(job.takeLabelingResults())
self.assertEqual(cache.dependentLayers('_labels_'), [layer])
# add another labeled layer
layer2 = QgsVectorLayer("Point?field=fldtxt:string",
"layer2", "memory")
layer2.setCustomProperty("labeling", "pal")
layer2.setCustomProperty("labeling/enabled", True)
layer2.setCustomProperty("labeling/fieldName", "fldtxt")
settings.setLayers([layer, layer2])
# second job should not be able to use label cache, since a new layer was added
job = job_type(settings)
job.setCache(cache)
job.start()
job.waitForFinished()
# shouldn't use cache
self.assertFalse(job.usedCachedLabels())
# but results should have been cached
self.assertTrue(cache.hasCacheImage('_labels_'))
self.assertEqual(set(cache.dependentLayers('_labels_')), {layer, layer2})
self.assertTrue(job.takeLabelingResults())示例3: checkRemovingNonLabeledLayerKeepsLabelCache
# 需要导入模块: from qgis.core import QgsMapRendererCache [as 别名]
# 或者: from qgis.core.QgsMapRendererCache import dependentLayers [as 别名]
def checkRemovingNonLabeledLayerKeepsLabelCache(self, job_type):
""" removing a previously used non-labeled layer should keep any previous label caches"""
layer = QgsVectorLayer("Point?field=fldtxt:string",
"layer1", "memory")
layer.setCustomProperty("labeling", "pal")
layer.setCustomProperty("labeling/enabled", True)
layer.setCustomProperty("labeling/fieldName", "fldtxt")
layer2 = QgsVectorLayer("Point?field=fldtxt:string",
"layer2", "memory")
settings = QgsMapSettings()
settings.setExtent(QgsRectangle(5, 25, 25, 45))
settings.setOutputSize(QSize(600, 400))
settings.setLayers([layer, layer2])
# with cache - first run should populate cache
cache = QgsMapRendererCache()
job = job_type(settings)
job.setCache(cache)
job.start()
job.waitForFinished()
self.assertFalse(job.usedCachedLabels())
self.assertTrue(cache.hasCacheImage('_labels_'))
self.assertTrue(job.takeLabelingResults())
self.assertEqual(set(cache.dependentLayers('_labels_')), {layer})
# remove a previously labeled layer
settings.setLayers([layer])
# second job should be able to use label cache, since only a non-labeled layer was removed
job = job_type(settings)
job.setCache(cache)
job.start()
job.waitForFinished()
# should use cache
self.assertTrue(job.usedCachedLabels())
# results should have been cached
self.assertTrue(cache.hasCacheImage('_labels_'))
self.assertEqual(set(cache.dependentLayers('_labels_')), {layer})
self.assertTrue(job.takeLabelingResults())