selector_percent.hpp

#pragma once
 
#include "vipra/logging/logging.hpp"
 
#include "vipra/vipra_behaviors/selectors/subselector.hpp"
 
namespace VIPRA::Behaviors {
struct SelectorPercent {
  NON_DEFAULT_CONSTRUCTIBLE(SelectorPercent)
  COPYABLE(SelectorPercent)
  MOVEABLE(SelectorPercent)
 
  explicit SelectorPercent(VIPRA::f_pnt pnt) : percentage(pnt) {}
 
  VIPRA::f_pnt percentage;
  auto         operator()(std::vector<VIPRA::idx> const& fullGroup,
                  std::vector<VIPRA::idx> const& group, auto pack) const -> SelectorResult
  {
    auto groupPeds = group;
 
    auto count = static_cast<VIPRA::size>(
        std::floor(percentage * static_cast<VIPRA::f_pnt>(fullGroup.size())));
 
    bool starved = false;
    if ( count > group.size() ) {
      starved = true;
      count = group.size();
    }
 
    VIPRA::Log::debug("Selector Percent: Selecting {} Pedestrians", count);
 
    std::shuffle(groupPeds.begin(), groupPeds.end(), pack.context.engine);
    groupPeds.resize(count);
 
    return {starved, groupPeds};
  }
};
 
}  // namespace VIPRA::Behaviors