Difference between revisions of "ParaView/Python/Lookup tables"

From KitwarePublic
Jump to: navigation, search
(API)
m
 
Line 102: Line 102:
  
 
</source>
 
</source>
 +
 +
Back to [[ParaView/PythonRecipes]].
 +
{{ParaView/Template/Footer}}

Latest revision as of 13:34, 16 October 2018

Summary

The simple API provides functions to manipulate look-up tables by name. The same LUTs found in the GUI are available by default. LUTs are associated with arrays, so first get the array from PointData or CellData of another proxy, next get the representation and set the ColorArrayName, and finally pass the LUT array and LUT name to AssignLookupTable. User provided LUTs may be loaded into the dictionary from disk using LoadLookupTable function.

API

The following API is provided for LUT manipulation in simple.py.

# -----------------------------------------------------------------------------
def AssignLookupTable(arrayObject, LUTName, rangeOveride=[]):
    """Assign a lookup table to an array by lookup table name. The array
    may be obtained from a ParaView source in it's point or cell data.
    The lookup tables available in ParaView's GUI are loaded by default.
    To get a list of the available lookup table names see GetLookupTableNames.
    To load a custom lookup table see LoadLookupTable."""

# -----------------------------------------------------------------------------
def GetLookupTableNames():
    """Return a list containing the currently available lookup table names.
    A name maybe used to assign a lookup table to an array. See
    AssignLookupTable.
    """

# -----------------------------------------------------------------------------
def LoadLookupTable(fileName):
    """Read the lookup tables in the named file and append them to the
    global collection of lookup tables. The newly loaded lookup tables
    may then be used with AssignLookupTable function.
    """

Example

The following example (from ParaView's regression tests) exercises the new API.

from paraview.simple import *
from paraview import smtesting                                                                                                                                                     

smtesting.ProcessCommandLineArguments()
lutfile='%s/testlut.xml'%(smtesting.TempDir)
testlut="""<ColorMaps>
<ColorMap name="testlut" space="RGB" indexedLookup="false">
  <Point x="1.86486" o="0" r="0.0392157" g="0.0392157" b="0.94902"/>
  <Point x="70.1081" o="0.6954" r="0" g="1" b="0"/>
  <Point x="100" o="1" r="0.94902" g="0.94902" b="0.0392157"/>
  <NaN r="1" g="0" b="0"/>
</ColorMap>
</ColorMaps>"""
f = open(lutfile,'w')
f.write(testlut)
f.close()

w = Wavelet()
wa = w.PointData.GetArray('RTData')

o = Outline(w)
Show(o)

s = Slice(w)
s.SliceType.Normal = [0.0, 0.0, 1.0]

r = Show(s)
r.ColorArrayName='RTData'
r.Representation='Surface'

v = GetRenderView()
v.CameraViewUp = [0,1,0]
v.CameraPosition = [-32,32,60]
v.CameraClippingRange = [33, 110]
v.UseGradientBackground = 1 
v.Background2 = [0.0, 0.0, 0.16471]
v.Background = [0.3216, 0.3412, 0.4314]
v.CenterAxesVisibility = 0 

# verify default laoding
if len(GetLookupTableNames())<1:
  raise smtesting.TestError('Failed to load the default LUTs.')

# exercsie the simple loader
if not LoadLookupTable(lutfile):
  raise smtesting.TestError('Failed to load the testlut file.')

names = GetLookupTableNames()
if 'testlut' not in names:
  raise smtesting.TestError('Failed to parse the testlut lut.')

# exercise simple assignment
print
print 'Rendering with %d LUTs'%(len(names))
print 'The available LUTs are:'
print names
print
for name in names:
  r.LookupTable=AssignLookupTable(wa,name)
  Render()

# choose one of them for the baseline
r.LookupTable=AssignLookupTable(wa,'Cold and Hot')
ren = Render()

if not smtesting.DoRegressionTesting(ren.SMProxy):
   raise smtesting.TestError('Image comparison failed.')

Back to ParaView/PythonRecipes.


ParaView: [Welcome | Site Map]