relation.hpp

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#pragma once
 
std::vector<uint32_t> relation_map_from(sys::state& state) {
    uint32_t province_size = state.world.province_size();
    uint32_t texture_size = province_size + 256 - province_size % 256;
 
    std::vector<uint32_t> prov_color(texture_size * 2);
 
    auto selected_province = state.map_state.get_selected_province();
    auto fat_id = dcon::fatten(state.world, selected_province);
    auto selected_nation = fat_id.get_nation_from_province_ownership();
 
    if(!selected_nation) {
        selected_nation = state.local_player_nation;
    }
 
    auto relations = selected_nation.get_diplomatic_relation_as_related_nations();
 
    state.world.for_each_province([&](dcon::province_id prov_id) {
        auto other_nation = state.world.province_get_nation_from_province_ownership(prov_id);
 
        // if the province has no owners
        if(!other_nation) {
            return;
        }
 
        uint32_t color;
 
        if(other_nation == selected_nation.id) {
            // the selected nation should be blue
            color = sys::pack_color(66, 106, 227);
        } else {
            auto diplo_relation = state.world.get_diplomatic_relation_by_diplomatic_pair(other_nation, selected_nation);
            auto relation_value = state.world.diplomatic_relation_get_value(diplo_relation);
 
            float interpolation = (200 + relation_value) / 400.f;
 
            color = ogl::color_gradient(interpolation, sys::pack_color(46, 247, 15), // green
                    sys::pack_color(247, 15, 15)    // red
            );
        }
 
        auto i = province::to_map_id(prov_id);
 
        prov_color[i] = color;
        prov_color[i + texture_size] = color;
    });
 
    return prov_color;
}