/////////////////////////////////////////////////////////////////////////////////
//
//  Copyright (C) Statoil ASA
//  Copyright (C) Ceetron Solutions AS
// 
//  ResInsight 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.
// 
//  ResInsight 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 at <http://www.gnu.org/licenses/gpl.html> 
//  for more details.
//
/////////////////////////////////////////////////////////////////////////////////

#include "gtest/gtest.h"

#include "RivTernaryScalarMapper.h"

#include "cvfTextureImage.h"
#include "cvfqtUtils.h"

#include <QImage>

//--------------------------------------------------------------------------------------------------
/// 
//--------------------------------------------------------------------------------------------------
TEST(TernaryScalarMapperTest, BasicFunctions)
{
    cvf::ref<RivTernaryScalarMapper> scalarMapper = new RivTernaryScalarMapper(cvf::Color3f::GRAY);

    cvf::ref<cvf::TextureImage> texImage = new cvf::TextureImage;
    scalarMapper->updateTexture(texImage.p(), 1.0);

    QImage img = cvfqt::Utils::toQImage(*(texImage.p()));

    img.save("c:/tmp/test.png");
}

//--------------------------------------------------------------------------------------------------
/// 
//--------------------------------------------------------------------------------------------------
TEST(TernaryScalarMapperTest, TextureMapping)
{
    cvf::ref<RivTernaryScalarMapper> scalarMapper = new RivTernaryScalarMapper(cvf::Color3f::GRAY);

    // See RivTernaryScalarMapper::mapToTextureCoord
    double edgeClampDelta = 1.1 * 0.001;

    // Without opacity
    {
        cvf::Vec2f texCoord = scalarMapper->mapToTextureCoord(0.0, 0.0, false);
        EXPECT_NEAR(0.0, texCoord.x(), edgeClampDelta);
        EXPECT_NEAR(0.0, texCoord.y(), edgeClampDelta);
    }

    {
        cvf::Vec2f texCoord = scalarMapper->mapToTextureCoord(1.0, 0.0, false);
        EXPECT_NEAR(1.0, texCoord.x(), edgeClampDelta);
        EXPECT_NEAR(0.0, texCoord.y(), edgeClampDelta);
    }

    {
        cvf::Vec2f texCoord = scalarMapper->mapToTextureCoord(0.0, 1.0, false);
        EXPECT_NEAR(0.0, texCoord.x(), edgeClampDelta);
        EXPECT_NEAR(0.5, texCoord.y(), edgeClampDelta);
    }

    {
        cvf::Vec2f texCoord = scalarMapper->mapToTextureCoord(3.0, 3.0, false);
        EXPECT_NEAR(1.0, texCoord.x(), edgeClampDelta);
        EXPECT_NEAR(0.0, texCoord.y(), edgeClampDelta);
    }

    {
        cvf::Vec2f texCoord = scalarMapper->mapToTextureCoord(-1.0, -1.0, false);
        EXPECT_NEAR(0.0, texCoord.x(), edgeClampDelta);
        EXPECT_NEAR(0.0, texCoord.y(), edgeClampDelta);
    }

    {
        cvf::Vec2f texCoord = scalarMapper->mapToTextureCoord(0.5, 3.0, false);
        EXPECT_NEAR(0.5, texCoord.x(), edgeClampDelta);
        EXPECT_NEAR(0.25, texCoord.y(), edgeClampDelta);
    }


    
    
    // Opacity
    {
        cvf::Vec2f texCoord = scalarMapper->mapToTextureCoord(0.0, 0.0, true);
        EXPECT_NEAR(0.0, texCoord.x(), edgeClampDelta);
        EXPECT_NEAR(0.5, texCoord.y(), edgeClampDelta);
    }

    {
        cvf::Vec2f texCoord = scalarMapper->mapToTextureCoord(0.0, 1.0, true);
        EXPECT_NEAR(0.0, texCoord.x(), edgeClampDelta);
        EXPECT_NEAR(1.0, texCoord.y(), edgeClampDelta);
    }
}