本文整理汇总了Python中qgis.core.QgsMapRendererCache.cacheImage方法的典型用法代码示例。如果您正苦于以下问题：Python QgsMapRendererCache.cacheImage方法的具体用法？Python QgsMapRendererCache.cacheImage怎么用？Python QgsMapRendererCache.cacheImage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.cacheImage方法的4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: testRequestRepaintSimple
# 需要导入模块: from qgis.core import QgsMapRendererCache [as 别名]
# 或者: from qgis.core.QgsMapRendererCache import cacheImage [as 别名]
def testRequestRepaintSimple(self):
""" test requesting repaint with a single dependent layer """
layer = QgsVectorLayer("Point?field=fldtxt:string",
"layer", "memory")
QgsProject.instance().addMapLayers([layer])
self.assertTrue(layer.isValid())
# add image to cache
cache = QgsMapRendererCache()
im = QImage(200, 200, QImage.Format_RGB32)
cache.setCacheImage('xxx', im, [layer])
self.assertFalse(cache.cacheImage('xxx').isNull())
self.assertTrue(cache.hasCacheImage('xxx'))
# trigger repaint on layer
layer.triggerRepaint()
# cache image should be cleared
self.assertTrue(cache.cacheImage('xxx').isNull())
self.assertFalse(cache.hasCacheImage('xxx'))
QgsProject.instance().removeMapLayer(layer.id())
# test that cache is also cleared on deferred update
layer = QgsVectorLayer("Point?field=fldtxt:string",
"layer", "memory")
cache.setCacheImage('xxx', im, [layer])
layer.triggerRepaint(True)
self.assertFalse(cache.hasCacheImage('xxx'))示例2: testSetCacheImages
# 需要导入模块: from qgis.core import QgsMapRendererCache [as 别名]
# 或者: from qgis.core.QgsMapRendererCache import cacheImage [as 别名]
def testSetCacheImages(self):
cache = QgsMapRendererCache()
# not set image
im = cache.cacheImage('littlehands')
self.assertTrue(im.isNull())
self.assertFalse(cache.hasCacheImage('littlehands'))
# set image
im = QImage(200, 200, QImage.Format_RGB32)
cache.setCacheImage('littlehands', im)
self.assertFalse(im.isNull())
self.assertEqual(cache.cacheImage('littlehands'), im)
self.assertTrue(cache.hasCacheImage('littlehands'))
# test another not set image when cache has images
self.assertTrue(cache.cacheImage('bad').isNull())
self.assertFalse(cache.hasCacheImage('bad'))
# clear cache image
cache.clearCacheImage('not in cache') # no crash!
cache.clearCacheImage('littlehands')
im = cache.cacheImage('littlehands')
self.assertTrue(im.isNull())
self.assertFalse(cache.hasCacheImage('littlehands'))
# clear whole cache
im = QImage(200, 200, QImage.Format_RGB32)
cache.setCacheImage('littlehands', im)
self.assertFalse(im.isNull())
self.assertTrue(cache.hasCacheImage('littlehands'))
cache.clear()
im = cache.cacheImage('littlehands')
self.assertTrue(im.isNull())
self.assertFalse(cache.hasCacheImage('littlehands'))示例3: testInit
# 需要导入模块: from qgis.core import QgsMapRendererCache [as 别名]
# 或者: from qgis.core.QgsMapRendererCache import cacheImage [as 别名]
def testInit(self):
cache = QgsMapRendererCache()
extent = QgsRectangle(1, 2, 3, 4)
self.assertFalse(cache.init(extent, 1000))
# add a cache image
im = QImage(200, 200, QImage.Format_RGB32)
cache.setCacheImage('layer', im)
self.assertFalse(cache.cacheImage('layer').isNull())
self.assertTrue(cache.hasCacheImage('layer'))
# re init, without changing extent or scale
self.assertTrue(cache.init(extent, 1000))
# image should still be in cache
self.assertFalse(cache.cacheImage('layer').isNull())
self.assertTrue(cache.hasCacheImage('layer'))
# reinit with different scale
self.assertFalse(cache.init(extent, 2000))
# cache should be cleared
self.assertTrue(cache.cacheImage('layer').isNull())
self.assertFalse(cache.hasCacheImage('layer'))
# readd image to cache
cache.setCacheImage('layer', im)
self.assertFalse(cache.cacheImage('layer').isNull())
self.assertTrue(cache.hasCacheImage('layer'))
# change extent
self.assertFalse(cache.init(QgsRectangle(11, 12, 13, 14), 2000))
# cache should be cleared
self.assertTrue(cache.cacheImage('layer').isNull())
self.assertFalse(cache.hasCacheImage('layer'))示例4: testRequestRepaintMultiple
# 需要导入模块: from qgis.core import QgsMapRendererCache [as 别名]
# 或者: from qgis.core.QgsMapRendererCache import cacheImage [as 别名]
def testRequestRepaintMultiple(self):
""" test requesting repaint with multiple dependent layers """
layer1 = QgsVectorLayer("Point?field=fldtxt:string",
"layer1", "memory")
layer2 = QgsVectorLayer("Point?field=fldtxt:string",
"layer2", "memory")
QgsProject.instance().addMapLayers([layer1, layer2])
self.assertTrue(layer1.isValid())
self.assertTrue(layer2.isValid())
# add image to cache - no dependent layers
cache = QgsMapRendererCache()
im1 = QImage(200, 200, QImage.Format_RGB32)
cache.setCacheImage('nolayer', im1)
self.assertFalse(cache.cacheImage('nolayer').isNull())
self.assertTrue(cache.hasCacheImage('nolayer'))
# trigger repaint on layer
layer1.triggerRepaint()
layer1.triggerRepaint() # do this a couple of times - we don't want errors due to multiple disconnects, etc
layer2.triggerRepaint()
layer2.triggerRepaint()
# cache image should still exist - it's not dependent on layers
self.assertFalse(cache.cacheImage('nolayer').isNull())
self.assertTrue(cache.hasCacheImage('nolayer'))
# image depends on 1 layer
im_l1 = QImage(200, 200, QImage.Format_RGB32)
cache.setCacheImage('im1', im_l1, [layer1])
# image depends on 2 layers
im_l1_l2 = QImage(200, 200, QImage.Format_RGB32)
cache.setCacheImage('im1_im2', im_l1_l2, [layer1, layer2])
# image depends on 2nd layer alone
im_l2 = QImage(200, 200, QImage.Format_RGB32)
cache.setCacheImage('im2', im_l2, [layer2])
self.assertFalse(cache.cacheImage('im1').isNull())
self.assertTrue(cache.hasCacheImage('im1'))
self.assertFalse(cache.cacheImage('im1_im2').isNull())
self.assertTrue(cache.hasCacheImage('im1_im2'))
self.assertFalse(cache.cacheImage('im2').isNull())
self.assertTrue(cache.hasCacheImage('im2'))
# trigger repaint layer 1 (check twice - don't want disconnect errors)
for i in range(2):
layer1.triggerRepaint()
# should be cleared
self.assertTrue(cache.cacheImage('im1').isNull())
self.assertFalse(cache.hasCacheImage('im1'))
self.assertTrue(cache.cacheImage('im1_im2').isNull())
self.assertFalse(cache.hasCacheImage('im1_im2'))
# should be retained
self.assertTrue(cache.hasCacheImage('im2'))
self.assertFalse(cache.cacheImage('im2').isNull())
self.assertEqual(cache.cacheImage('im2'), im_l2)
self.assertTrue(cache.hasCacheImage('nolayer'))
self.assertFalse(cache.cacheImage('nolayer').isNull())
self.assertEqual(cache.cacheImage('nolayer'), im1)
# trigger repaint layer 2
for i in range(2):
layer2.triggerRepaint()
# should be cleared
self.assertFalse(cache.hasCacheImage('im1'))
self.assertTrue(cache.cacheImage('im1').isNull())
self.assertFalse(cache.hasCacheImage('im1_im2'))
self.assertTrue(cache.cacheImage('im1_im2').isNull())
self.assertFalse(cache.hasCacheImage('im2'))
self.assertTrue(cache.cacheImage('im2').isNull())
# should be retained
self.assertTrue(cache.hasCacheImage('nolayer'))
self.assertFalse(cache.cacheImage('nolayer').isNull())
self.assertEqual(cache.cacheImage('nolayer'), im1)