tablelayout.h

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#pragma once
 
 
#include "base/numeric.h"
 
#include "assert/assert.h"
 
 
namespace eu::core
{
    template <typename T>
    std::vector<T>
    perform_table_layout(const std::vector<T>& pieces, T total_size, T zero = 0)
    {
        ASSERTX(total_size >= 0, total_size);
        ASSERT(zero <= 0);
 
        T min_size = 0;
        T total_percentage = 0;
        for(T f: pieces)
        {
            if(f > 0)
            {
                min_size += f;
            }
            else
            {
                total_percentage += -f;
            }
        }
        const T size_left = total_size - min_size;
        const T fixed_scale = min_size < total_size ? 1 : total_size / min_size;
 
        std::vector<T> ret;
        ret.reserve(pieces.size());
        for(T f: pieces)
        {
            if(f > 0)
            {
                ret.push_back(f * fixed_scale);
            }
            else
            {
                if(size_left <= 0)
                {
                    // no more room, add 0
                    ret.push_back(zero);
                }
                else
                {
                    const T p = (-f / total_percentage);
                    const T size = p * size_left;
                    ret.push_back(size);
                }
            }
        }
        return ret;
    }
 
}