本文整理汇总了Python中GrassUtils.GrassUtils.startGrassSession方法的典型用法代码示例。如果您正苦于以下问题：Python GrassUtils.startGrassSession方法的具体用法？Python GrassUtils.startGrassSession怎么用？Python GrassUtils.startGrassSession使用的例子？那么, 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GrassUtils.GrassUtils的用法示例。
在下文中一共展示了GrassUtils.startGrassSession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: processAlgorithm
# 需要导入模块: from GrassUtils import GrassUtils [as 别名]
# 或者: from GrassUtils.GrassUtils import startGrassSession [as 别名]
def processAlgorithm(self, progress):
if system.isWindows():
path = GrassUtils.grassPath()
if path == '':
raise GeoAlgorithmExecutionException(
self.tr('GRASS folder is not configured.\nPlease '
'configure it before running GRASS algorithms.'))
commands = []
self.exportedLayers = {}
outputCommands = []
# If GRASS session has been created outside of this algorithm then
# get the list of layers loaded in GRASS otherwise start a new
# session
existingSession = GrassUtils.sessionRunning
if existingSession:
self.exportedLayers = GrassUtils.getSessionLayers()
else:
GrassUtils.startGrassSession()
# 1: Export layer to grass mapset
for param in self.parameters:
if isinstance(param, ParameterRaster):
if param.value is None:
continue
value = param.value
# Check if the layer hasn't already been exported in, for
# example, previous GRASS calls in this session
if value in self.exportedLayers.keys():
continue
else:
self.setSessionProjectionFromLayer(value, commands)
commands.append(self.exportRasterLayer(value))
if isinstance(param, ParameterVector):
if param.value is None:
continue
value = param.value
if value in self.exportedLayers.keys():
continue
else:
self.setSessionProjectionFromLayer(value, commands)
commands.append(self.exportVectorLayer(value))
if isinstance(param, ParameterTable):
pass
if isinstance(param, ParameterMultipleInput):
if param.value is None:
continue
layers = param.value.split(';')
if layers is None or len(layers) == 0:
continue
if param.datatype == ParameterMultipleInput.TYPE_RASTER:
for layer in layers:
if layer in self.exportedLayers.keys():
continue
else:
self.setSessionProjectionFromLayer(layer, commands)
commands.append(self.exportRasterLayer(layer))
elif param.datatype == ParameterMultipleInput.TYPE_VECTOR_ANY:
for layer in layers:
if layer in self.exportedLayers.keys():
continue
else:
self.setSessionProjectionFromLayer(layer, commands)
commands.append(self.exportVectorLayer(layer))
self.setSessionProjectionFromProject(commands)
region = \
unicode(self.getParameterValue(self.GRASS_REGION_EXTENT_PARAMETER))
regionCoords = region.split(',')
command = 'g.region'
command += ' n=' + unicode(regionCoords[3])
command += ' s=' + unicode(regionCoords[2])
command += ' e=' + unicode(regionCoords[1])
command += ' w=' + unicode(regionCoords[0])
cellsize = self.getParameterValue(self.GRASS_REGION_CELLSIZE_PARAMETER)
if cellsize:
command += ' res=' + unicode(cellsize)
else:
command += ' res=' + unicode(self.getDefaultCellsize())
alignToResolution = \
self.getParameterValue(self.GRASS_REGION_ALIGN_TO_RESOLUTION)
if alignToResolution:
command += ' -a'
commands.append(command)
# 2: Set parameters and outputs
command = self.grassName
for param in self.parameters:
if param.value is None or param.value == '':
continue
if param.name in [ self.GRASS_REGION_CELLSIZE_PARAMETER, self.GRASS_REGION_EXTENT_PARAMETER, self.GRASS_MIN_AREA_PARAMETER, self.GRASS_SNAP_TOLERANCE_PARAMETER, self.GRASS_OUTPUT_TYPE_PARAMETER, self.GRASS_REGION_ALIGN_TO_RESOLUTION ]:
continue
if isinstance(param, (ParameterRaster, ParameterVector)):
value = param.value
if value in self.exportedLayers.keys():
#.........这里部分代码省略.........