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#############################################################
## ##
## Copyright (c) 2003-2011 by The University of Queensland ##
## Earth Systems Science Computational Centre (ESSCC) ##
## http://www.uq.edu.au/esscc ##
## ##
## Primary Business: Brisbane, Queensland, Australia ##
## Licensed under the Open Software License version 3.0 ##
## http://www.opensource.org/licenses/osl-3.0.php ##
## ##
#############################################################
"""
Defines the L{SphereExtractor} class.
"""
from Color import Colors
from Extractor import Extractor
class SphereExtractor(Extractor):
"""
Objects of this class can be used in conjunction with the
L{esys.lsm.vis.core.GlyphData} class for extracting sphere
info from data-records.
"""
def __init__(
self,
radiusMap = lambda dataRecord: dataRecord.getRadius(),
centerMap = lambda dataRecord: dataRecord.getCenter(),
modifierMap = lambda dataRecord: Colors.Red,
radiusScale = 1.0
):
"""
Constructs the extractor.
@type radiusMap: callable
@param radiusMap: A callable which accepts a single data-record
argument and returns a radius (float) value.
@type centerMap: callable
@param centerMap: A callable which accepts a single data-record
argument and returns a 3 float-element sequence (ie a 3D coordinate).
@type modifierMap: callable
@param modifierMap: A callable which accepts a single data-record
argument and returns an object modifier (or sequence of modifiers).
@type radiusScale: float
@param radiusScale: Scaling factor applied to all sphere radii.
"""
self.radiusMap = radiusMap
self.centerMap = centerMap
self.modifierMap = modifierMap
self.radiusScale = radiusScale
def getRadiusScale(self):
return self.radiusScale
def getRadius(self, dataRecord):
return self.radiusMap(dataRecord)*self.getRadiusScale()
def getCenter(self, dataRecord):
return self.centerMap(dataRecord)
def getModifier(self, dataRecord):
return self.modifierMap(dataRecord)
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