Function is_wagon_tile_traversible

plugins/pathable.cpp:250–271

NOTE: When i.e. tracks, stairs have a bridge over them, the tile will have an occupancy of floored.

// NOTE: When i.e. tracks, stairs have a bridge over them, the tile will have
// an occupancy of floored.
static bool is_wagon_tile_traversible(df::tiletype tt) {
    auto shape = tileShape(tt);
    auto special = tileSpecial(tt);
    auto material = tileMaterial(tt);

    // Allow ramps (murky pool and river tiles are blocked except for ramps)
    if (shape == df::tiletype_shape::RAMP_TOP)
        return true;
    // NOTE: smoothing a boulder turns it into a smoothed floor
    else if (shape == df::tiletype_shape::STAIR_UP || shape == df::tiletype_shape::STAIR_DOWN ||
            shape == df::tiletype_shape::STAIR_UPDOWN || shape == df::tiletype_shape::BOULDER ||
            shape == df::tiletype_shape::EMPTY || shape == df::tiletype_shape::NONE)
        return false;
    else if (special == df::tiletype_special::TRACK)
        return false;
    // Fires seem to have their own path group, and group for lava is 0
    // According to wiki, the wagon won't path thru pool and river tiles, but ramps are ok
    else if (material == df::tiletype_material::POOL || material == df::tiletype_material::RIVER)
        return false;

    return true;
}

static bool is_wagon_traversible(FloodCtx & ctx, const df::coord & pos, const df::coord & prev_pos) {
    auto tt = Maps::getTileType(pos);