DistortedTanWcs.h

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// -*- lsst-c++ -*-
/* 
 * 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/>.
 */
#ifndef LSST_AFW_IMAGE_DISTORTEDTANWCS_H
#define LSST_AFW_IMAGE_DISTORTEDTANWCS_H

#include "lsst/afw/image/TanWcs.h"
#include "lsst/afw/geom.h"

namespace lsst {
namespace afw {
namespace image {

class DistortedTanWcs : public TanWcs {
public:
    DistortedTanWcs(
        TanWcs const &tanWcs,
        geom::XYTransform const &pixelsToTanPixels
    );

    virtual ~DistortedTanWcs() {};

    virtual PTR(Wcs) clone() const;

    bool operator==(Wcs const & other) const;

    virtual void flipImage(int flipLR, int flipTB, lsst::afw::geom::Extent2I dimensions) const;

    virtual void rotateImageBy90(int nQuarter, lsst::afw::geom::Extent2I dimensions) const;

    virtual void shiftReferencePixel(double dx, double dy);

    bool isPersistable() const { return false; }

    bool hasDistortion() const { return true; }

    PTR(Wcs) getTanWcs() const { return TanWcs::clone(); }

    PTR(geom::XYTransform) getPixelToTanPixel() const { return _pixelsToTanPixelsPtr->clone(); }

protected:

    virtual void pixelToSkyImpl(double pixel1, double pixel2, geom::Angle skyTmp[2]) const;

    virtual geom::Point2D skyToPixelImpl(geom::Angle sky1, geom::Angle sky2) const;

private:

    PTR(geom::XYTransform) _pixelsToTanPixelsPtr;   // XYTransform that converts from PIXELS to TAN_PIXELS 
                                                    // coordinates in the forward direction

};

}}} // namespace lsst::afw::image

#endif