用于c++的Colormap库，它将给定的值转换为红色，绿色和蓝色值

Colormap library for C++ which converts a given value into red, green and blue values

本文关键字：转换 红色 蓝色 Colormap c++ 用于      更新时间：2023-10-16

我正在寻找一个将给定值转换为红色，绿色和蓝色值的colormap库。类似于matlab的colormap特性[1]。最好使用c++。

[1] http://www.mathworks.com/help/techdoc/ref/colormap.html

我个人认为这对于一个库来说太简单了，我自己实现了它，这是C语言的例子(你可以在维基百科上查找数学解释):

    /** 
     * Computes the color gradiant
     * color: the output vector 
     * x: the gradiant (beetween 0 and 360)
     * min and max: variation of the RGB channels (Move3D 0 -> 1)
     */
    void GroundColorMix(double* color, double x, double min, double max)
{
   /*
    * Red = 0
    * Green = 1
    * Blue = 2
    */
    double posSlope = (max-min)/60;
    double negSlope = (min-max)/60;
    if( x < 60 )
    {
        color[0] = max;
        color[1] = posSlope*x+min;
        color[2] = min;
        return;
    }
    else if ( x < 120 )
    {
        color[0] = negSlope*x+2*max+min;
        color[1] = max;
        color[2] = min;
        return;
    }
    else if ( x < 180  )
    {
        color[0] = min;
        color[1] = max;
        color[2] = posSlope*x-2*max+min;
        return;
    }
    else if ( x < 240  )
    {
        color[0] = min;
        color[1] = negSlope*x+4*max+min;
        color[2] = max;
        return;
    }
    else if ( x < 300  )
    {
        color[0] = posSlope*x-4*max+min;
        color[1] = min;
        color[2] = max;
        return;
    }
    else
    {
        color[0] = max;
        color[1] = min;
        color[2] = negSlope*x+6*max;
        return;
    }
}
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