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/************************************************************************
*
* Copyright (C) 2009-2023 IRCAD France
* Copyright (C) 2012-2020 IHU Strasbourg
*
* This file is part of Sight.
*
* Sight is free software: you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Sight 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Sight. If not, see <https://www.gnu.org/licenses/>.
*
***********************************************************************/
#include "io/vtk/helper/transfer_function.hpp"
#include <vtkLookupTable.h>
namespace sight::io::vtk::helper
{
//------------------------------------------------------------------------------
void transfer_function::to_vtk_lookup_table(
data::transfer_function::csptr _tf,
vtkSmartPointer<vtkLookupTable> _lt,
bool _allow_transparency,
unsigned int _size
)
{
// Configures basic parameters
_lt->SetNumberOfTableValues(_size);
_lt->SetScaleToLinear();
data::transfer_function::min_max_t min_max = _tf->min_max();
_lt->SetTableRange(min_max.first, min_max.second);
double delta = (min_max.second - min_max.first) / (double) (_size - 1);
data::transfer_function::color_t interpolated_color;
if(_allow_transparency)
{
for(unsigned int k = 0 ; k < _size ; ++k)
{
interpolated_color = _tf->sample(k * delta + min_max.first);
_lt->SetTableValue(
k,
interpolated_color.r,
interpolated_color.g,
interpolated_color.b,
interpolated_color.a
);
}
}
else
{
for(unsigned int k = 0 ; k < _size ; ++k)
{
interpolated_color = _tf->sample(k * delta + min_max.first);
_lt->SetTableValue(k, interpolated_color.r, interpolated_color.g, interpolated_color.b, 1.0);
}
}
_lt->Modified();
}
//------------------------------------------------------------------------------
void transfer_function::to_bw_vtk_lookup_table(
double _range_min,
double _range_max,
vtkSmartPointer<vtkLookupTable> _lt,
unsigned int _size
)
{
// Configures basic parameters
_lt->Allocate(static_cast<int>(_size), static_cast<int>(_size));
_lt->SetScaleToLinear();
_lt->SetRampToLinear();
_lt->SetTableRange(_range_min, _range_max);
_lt->SetAlphaRange(1.0, 1.0);
_lt->SetHueRange(0.0, 0.0);
_lt->SetSaturationRange(0.0, 0.0);
_lt->SetValueRange(0.0, 1.0);
_lt->Build();
_lt->Modified();
}
//------------------------------------------------------------------------------
} // namespace sight::io::vtk::helper
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