color_maps_unittest.cpp

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/* +------------------------------------------------------------------------+
   |                     Mobile Robot Programming Toolkit (MRPT)            |
   |                          https://www.mrpt.org/                         |
   |                                                                        |
   | Copyright (c) 2005-2020, Individual contributors, see AUTHORS file     |
   | See: https://www.mrpt.org/Authors - All rights reserved.               |
   | Released under BSD License. See: https://www.mrpt.org/License          |
   +------------------------------------------------------------------------+ */

#include <gtest/gtest.h>
#include <mrpt/img/color_maps.h>

TEST(color_maps, cmGRAYSCALE)
{
    using namespace mrpt::img;

    {
        float r, g, b;
        colormap(cmGRAYSCALE, .0f, r, g, b);
        EXPECT_NEAR(r, .0f, 1e-3f);
        EXPECT_NEAR(g, .0f, 1e-3f);
        EXPECT_NEAR(b, .0f, 1e-3f);
    }
    {
        float r, g, b;
        colormap(cmGRAYSCALE, 1.0f, r, g, b);
        EXPECT_NEAR(r, 1.0f, 1e-3f);
        EXPECT_NEAR(g, 1.0f, 1e-3f);
        EXPECT_NEAR(b, 1.0f, 1e-3f);
    }
    {
        float r, g, b;
        colormap(cmGRAYSCALE, -0.1f, r, g, b);
        EXPECT_NEAR(r, .0f, 1e-3f);
        EXPECT_NEAR(g, .0f, 1e-3f);
        EXPECT_NEAR(b, .0f, 1e-3f);
    }
    {
        float r, g, b;
        colormap(cmGRAYSCALE, 1.2f, r, g, b);
        EXPECT_NEAR(r, 1.0f, 1e-3f);
        EXPECT_NEAR(g, 1.0f, 1e-3f);
        EXPECT_NEAR(b, 1.0f, 1e-3f);
    }
    {
        float r, g, b;
        colormap(cmGRAYSCALE, 0.8f, r, g, b);
        EXPECT_NEAR(r, 0.8f, 1e-3f);
        EXPECT_NEAR(g, 0.8f, 1e-3f);
        EXPECT_NEAR(b, 0.8f, 1e-3f);
    }
}

TEST(color_maps, cmJET)
{
    using namespace mrpt::img;

    {
        float r, g, b;
        colormap(cmJET, .0f, r, g, b);
        EXPECT_NEAR(r, 0.0f, 1e-3f);
        EXPECT_NEAR(g, 0.0f, 1e-3f);
        EXPECT_NEAR(b, 0.5625f, 1e-3f);
    }
    {
        float r, g, b;
        colormap(cmJET, 1.0f, r, g, b);
        EXPECT_NEAR(r, 0.5f, 1e-3f);
        EXPECT_NEAR(g, 0.0f, 1e-3f);
        EXPECT_NEAR(b, 0.0f, 1e-3f);
    }
    {
        float r, g, b;
        colormap(cmJET, 0.8f, r, g, b);
        EXPECT_NEAR(r, 1.0f, 1e-3f);
        EXPECT_NEAR(g, 0.2375f, 1e-3f);
        EXPECT_NEAR(b, 0.0f, 1e-3f);
    }
}

TEST(color_maps, cmHOT)
{
    using namespace mrpt::img;

    {
        float r, g, b;
        colormap(cmHOT, .0f, r, g, b);
        EXPECT_NEAR(r, 0.04166f, 1e-3f);
        EXPECT_NEAR(g, 0.0f, 1e-3f);
        EXPECT_NEAR(b, 0.0f, 1e-3f);
    }
    {
        float r, g, b;
        colormap(cmHOT, 1.0f, r, g, b);
        EXPECT_NEAR(r, 1.0f, 1e-3f);
        EXPECT_NEAR(g, 1.0f, 1e-3f);
        EXPECT_NEAR(b, 1.0f, 1e-3f);
    }
    {
        float r, g, b;
        colormap(cmHOT, 0.8f, r, g, b);
        EXPECT_NEAR(r, 1.0f, 1e-3f);
        EXPECT_NEAR(g, 1.0f, 1e-3f);
        EXPECT_NEAR(b, 0.2625f, 1e-3f);
    }
}