本文整理汇总了Python中qgis.core.QgsRasterLayer.setCacheImage方法的典型用法代码示例。如果您正苦于以下问题：Python QgsRasterLayer.setCacheImage方法的具体用法？Python QgsRasterLayer.setCacheImage怎么用？Python QgsRasterLayer.setCacheImage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.QgsRasterLayer的用法示例。
在下文中一共展示了QgsRasterLayer.setCacheImage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: loadLabelImage
# 需要导入模块: from qgis.core import QgsRasterLayer [as 别名]
# 或者: from qgis.core.QgsRasterLayer import setCacheImage [as 别名]
def loadLabelImage(imagepath, labeldescriptor = None):
"""
Load a labeled single band raster in the canvas
Keyword arguments:
imagepath -- the path to the image
labeldescriptor -- a dictionnary for label (int) to tuple (QColor, QString) conversion
"""
if imagepath is None:
return
name = os.path.splitext( os.path.basename(imagepath) )[0]
qgslayer = QgsRasterLayer(imagepath, name)
if not qgslayer.isValid():
QtGui.QMessageBox.critical(None,
u"Erreur",
u"Impossible de charger la couche %s" % unicode(imagepath))
QgsMapLayerRegistry.instance().addMapLayer(qgslayer)
qgslayer.setDrawingStyle('SingleBandPseudoColor')
colorlist = []
max_label = 0
for label in sorted(labeldescriptor.keys()):
color = labeldescriptor[label][0]
labeltxt = labeldescriptor[label][1]
colorlist.append(QgsColorRampShader.ColorRampItem(label, color, labeltxt))
if labeltxt > max_label:
max_label = labeltxt
s = QgsRasterShader()
c = QgsColorRampShader()
c.setColorRampType(QgsColorRampShader.INTERPOLATED)
c.setColorRampItemList(colorlist)
s.setRasterShaderFunction(c)
ps = QgsSingleBandPseudoColorRenderer(qgslayer.dataProvider(), 1, s)
qgslayer.setRenderer(ps)
for bandNo in range(1,qgslayer.dataProvider().bandCount()+1):
qgslayer.dataProvider().setUseSrcNoDataValue( bandNo, False )
QGisLayers.iface.legendInterface().refreshLayerSymbology(qgslayer)
if hasattr(qgslayer, "setCacheImage"):
qgslayer.setCacheImage(None)
qgslayer.triggerRepaint()