/***********************************************************************************
 *                                                                                 *
 * Voreen - The Volume Rendering Engine                                            *
 *                                                                                 *
 * Copyright (C) 2005-2012 University of Muenster, Germany.                        *
 * Visualization and Computer Graphics Group <http://viscg.uni-muenster.de>        *
 * For a list of authors please refer to the file "CREDITS.txt".                   *
 *                                                                                 *
 * This file is part of the Voreen software package. Voreen is free software:      *
 * you can redistribute it and/or modify it under the terms of the GNU General     *
 * Public License version 2 as published by the Free Software Foundation.          *
 *                                                                                 *
 * Voreen 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 GNU General Public License in the file   *
 * "LICENSE.txt" along with this file. If not, see <http://www.gnu.org/licenses/>. *
 *                                                                                 *
 * For non-commercial academic use see the license exception specified in the file *
 * "LICENSE-academic.txt". To get information about commercial licensing please    *
 * contact the authors.                                                            *
 *                                                                                 *
 ***********************************************************************************/

#include "modules/flowreen/datastructures/volumeoperatorflowmagnitude.h"
#include "modules/flowreen/datastructures/volumeflow3d.h"

namespace voreen {

VolumeRAM_UInt8* VolumeOperatorFlowMagnitude::apply(const VolumeBase* vh) const {
    const VolumeFlow3D* v = dynamic_cast<const VolumeFlow3D*>(vh->getRepresentation<VolumeRAM>());
    if(!v)
        return 0;

    const Flow3D& flow = v->getFlow3D();
    const size_t numVoxels = v->getNumVoxels();
    unsigned char* magnitudes = new unsigned char[numVoxels];
    for (size_t i = 0; i < numVoxels; ++i) {
        float m = (tgt::length(flow.flow3D_[i]) / flow.maxMagnitude_) * 255.0f;
        magnitudes[i] = static_cast<unsigned char>(m);
    }

    return new VolumeRAM_UInt8(magnitudes, flow.dimensions_);
}

}   // namespace
