def dynamicsMultiBand(self, layerRenderer, listCanvasLayer):
"""
Applies the dynamic of the selected layer to all multi band layers
:param layerRenderer:
:param listCanvasLayer:
:return:
"""
# layerRenderer
# <qgis.core.QgsMultiBandColorRenderer object at 0x514c9e0>
layerCERed = layerRenderer.redContrastEnhancement()
layerCEGreen = layerRenderer.greenContrastEnhancement()
layerCEBlue = layerRenderer.blueContrastEnhancement()
if layerCERed and layerCEGreen and layerCEBlue:
#set stretch to min max
layerCERed.setContrastEnhancementAlgorithm(1)
layerCEGreen.setContrastEnhancementAlgorithm(1)
layerCEBlue.setContrastEnhancementAlgorithm(1)
logger.debug("red :" +
str(layerCERed.contrastEnhancementAlgorithm()))
logger.debug("green:" +
str(layerCEGreen.contrastEnhancementAlgorithm()))
logger.debug("blue :" +
str(layerCEBlue.contrastEnhancementAlgorithm()))
#get the min and max of RGB bands
maxCurrentRed = layerCERed.maximumValue()
minCurrentRed = layerCERed.minimumValue()
logger.debug("min red:" + str(minCurrentRed) + "max red:" +
str(maxCurrentRed))
maxCurrentGreen = layerCEGreen.maximumValue()
minCurrentGreen = layerCEGreen.minimumValue()
logger.debug("min green:" + str(minCurrentGreen) + "max green:" +
str(maxCurrentGreen))
maxCurrentBlue = layerCEBlue.maximumValue()
minCurrentBlue = layerCEBlue.minimumValue()
logger.debug("min blue:" + str(minCurrentBlue) + "max blue:" +
str(maxCurrentBlue))
# for each layer
logger.debug("there are" + str(len(listCanvasLayer)) +
" layers in the canvas")
for layerFromList in listCanvasLayer:
logger.debug("layer from list name :" +
str(layerFromList.name()))
# which is raster
if layerFromList.type() == 1:
logger.debug("layer from list is a raster file")
# which is multi
if layerFromList.rasterType() == 2:
logger.debug("multiband file")
dataProvider = layerFromList.dataProvider()
#take the layer renderer to set the min and max
rendererFromList = layerFromList.renderer()
#<qgis.core.QgsMultiBandColorRenderer object at 0x3f8a8d0>
logger.debug("renderer from list" +
str(rendererFromList))
logger.debug("green band" +
str(rendererFromList.greenBand()))
logger.debug("blue band" +
str(rendererFromList.blueBand()))
logger.debug("red band" +
str(rendererFromList.redBand()))
logger.info(rendererFromList)
redEnhancement = None
if QGis.QGIS_VERSION_INT == 10800: # for QGIS = 1.8
redEnhancement = QgsContrastEnhancement(
QgsContrastEnhancement.QgsRasterDataType(
dataProvider.dataType(0)))
elif QGis.QGIS_VERSION_INT >= 10900: # for QGIS = 1.9
redEnhancement = QgsContrastEnhancement(
dataProvider.dataType(1))
if redEnhancement:
redEnhancement.setMinimumValue(minCurrentRed)
redEnhancement.setMaximumValue(maxCurrentRed)
redEnhancement.setContrastEnhancementAlgorithm(1)
rendererFromList.setRedContrastEnhancement(
redEnhancement)
greenEnhancement = None
if QGis.QGIS_VERSION_INT == 10800: # for QGIS = 1.8
greenEnhancement = QgsContrastEnhancement(
QgsContrastEnhancement.QgsRasterDataType(
dataProvider.dataType(1)))
elif QGis.QGIS_VERSION_INT >= 10900: # for QGIS = 1.9
greenEnhancement = QgsContrastEnhancement(
dataProvider.dataType(2))
if greenEnhancement:
greenEnhancement.setMinimumValue(minCurrentGreen)
greenEnhancement.setMaximumValue(maxCurrentGreen)
greenEnhancement.setContrastEnhancementAlgorithm(1)
rendererFromList.setGreenContrastEnhancement(
greenEnhancement)
blueEnhancement = None
if QGis.QGIS_VERSION_INT == 10800: # for QGIS = 1.8
blueEnhancement = QgsContrastEnhancement(
QgsContrastEnhancement.QgsRasterDataType(
dataProvider.dataType(2)))
elif QGis.QGIS_VERSION_INT >= 10900: # for QGIS = 1.9
blueEnhancement = QgsContrastEnhancement(
dataProvider.dataType(3))
if blueEnhancement:
blueEnhancement.setMinimumValue(minCurrentBlue)
blueEnhancement.setMaximumValue(maxCurrentBlue)
blueEnhancement.setContrastEnhancementAlgorithm(1)
rendererFromList.setBlueContrastEnhancement(
blueEnhancement)
layerFromList.setCacheImage(None)
layerFromList.triggerRepaint()
