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# 

# LSST Data Management System 

# Copyright 2008, 2009, 2010 LSST Corporation. 

# 

# This product includes software developed by the 

# LSST Project (http://www.lsst.org/). 

# 

# This program is free software: you can redistribute it and/or modify 

# it under the terms of the GNU General Public License as published by 

# the Free Software Foundation, either version 3 of the License, or 

# (at your option) any later version. 

# 

# This program is distributed in the hope that it will be useful, 

# but WITHOUT ANY WARRANTY; without even the implied warranty of 

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 

# GNU General Public License for more details. 

# 

# You should have received a copy of the LSST License Statement and 

# the GNU General Public License along with this program. If not, 

# see <http://www.lsstcorp.org/LegalNotices/>. 

# 

import unittest 

 

import lsst.afw.image as afwImage 

import lsst.utils.tests 

from lsst.pipe.tasks.scaleZeroPoint import ScaleZeroPointTask 

 

 

class ScaleZeroPointTaskTestCase(unittest.TestCase): 

 

"""A test case for ScaleZeroPointTask 

""" 

 

def testBasics(self): 

for outZeroPoint in (23, 24): 

config = ScaleZeroPointTask.ConfigClass() 

config.zeroPoint = outZeroPoint 

zpScaler = ScaleZeroPointTask(config=config) 

outCalib = zpScaler.getCalib() 

 

self.assertAlmostEqual(outCalib.getMagnitude(1.0), outZeroPoint) 

 

for inZeroPoint in (24, 25.5): 

exposure = afwImage.ExposureF(10, 10) 

mi = exposure.getMaskedImage() 

mi.set(1.0) 

var = mi.getVariance() 

var.set(1.0) 

 

inCalib = self.makeCalib(inZeroPoint) 

exposure.setCalib(inCalib) 

imageScaler = zpScaler.computeImageScaler(exposure) 

 

predScale = 1.0 / inCalib.getFlux(outZeroPoint) 

self.assertAlmostEqual(predScale, imageScaler._scale) 

 

inFluxAtOutZeroPoint = exposure.getCalib().getFlux(outZeroPoint) 

outFluxAtOutZeroPoint = outCalib.getFlux(outZeroPoint) 

self.assertAlmostEqual(outFluxAtOutZeroPoint / imageScaler._scale, inFluxAtOutZeroPoint) 

 

inFluxMag0 = exposure.getCalib().getFluxMag0() 

outFluxMag0 = outCalib.getFluxMag0() 

self.assertAlmostEqual(outFluxMag0[0] / imageScaler._scale, inFluxMag0[0], places=4) 

 

imageScaler.scaleMaskedImage(mi) 

self.assertAlmostEqual(mi.get(1, 1)[0], predScale) # check image plane scaled 

self.assertAlmostEqual(mi.get(1, 1)[2], predScale**2) # check variance plane scaled 

 

def makeCalib(self, zeroPoint): 

calib = afwImage.Calib() 

fluxMag0 = 10**(0.4 * zeroPoint) 

calib.setFluxMag0(fluxMag0, 1.0) 

return calib 

 

 

class MyMemoryTestCase(lsst.utils.tests.MemoryTestCase): 

pass 

 

 

def setup_module(module): 

lsst.utils.tests.init() 

 

 

84 ↛ 85line 84 didn't jump to line 85, because the condition on line 84 was never trueif __name__ == "__main__": 

lsst.utils.tests.init() 

unittest.main()