Method getValue

library/modules/Items.cpp:1649–1752

}

int Items::getValue(df::item *item, df::caravan_state *caravan) {
    CHECK_NULL_POINTER(item);
    int16_t item_type = item->getType();
    int16_t item_subtype = item->getSubtype();
    int16_t mat_type = item->getMaterial();
    int32_t mat_subtype = item->getMaterialIndex();

    // Get base value for item type, subtype, and material
    int value = getItemBaseValue(item_type, item_subtype, mat_type, mat_subtype);
    // Entity value modifications
    value *= get_war_multiplier(item, caravan);
    value >>= 8;

    // Improve value based on quality
    switch (item->getQuality())
    {
        case 1: value *= 1.1; value += 3; break; // (-) well-crafted
        case 2: value *= 1.2; value += 6; break; // (+) Finely-crafted
        case 3: value *= 1.333; value += 10; break; // (*) superior quality
        case 4: value *= 1.5; value += 15; break; // (≡) exceptional
        case 5: value *= 2; value += 30; break; // (☼) masterful, artifact
    }

    // Add improvement values
    int impValue = item->getThreadDyeValue(caravan) + item->getImprovementsValue(caravan);
    if (item_type == item_type::AMMO) // Ammo improvements are worth less
        impValue /= 30;
    value += impValue;

    // Degrade value due to wear
    switch (item->getWear())
    {
        case 1: value = value * 3 / 4; break; // (x) worn
        case 2: value = value / 2; break; // (X) threadbare
        case 3: value = value / 4; break; // (XX) tattered
    }

    // Magical powers have 500 value each
    auto magic = item->getMagic();
    if (magic != NULL)
        value += magic->power.size() * 500;

    // Artifacts have 10x value
    if (item->flags.bits.artifact_mood)
        value *= 10;

    // Modify buy/sell prices
    if (caravan) {
        int32_t buy_multiplier = get_buy_request_multiplier(item, caravan->buy_prices);
        if (buy_multiplier == DEFAULT_AGREEMENT_MULTIPLIER)
            value *= get_sell_request_multiplier(item, caravan);
        else
            value *= buy_multiplier;
        value >>= 7;
    }

    // Boost value from stack size
    value *= item->getStackSize();