Function TrackDesignPreviewClearMap

src/openrct2/ride/TrackDesign.cpp:2171–2197

* Resets all the map elements to surface tiles for track preview. * rct2: 0x006D1D9A */

 *  rct2: 0x006D1D9A
 */
static void TrackDesignPreviewClearMap()
{
    auto numTiles = kMaximumMapSizeTechnical * kMaximumMapSizeTechnical;

    auto& gameState = getGameState();
    gameState.mapSize = TRACK_DESIGN_PREVIEW_MAP_SIZE;

    // Reserve ~8 elements per tile
    std::vector<TileElement> tileElements;
    tileElements.reserve(numTiles * 8);

    for (int32_t i = 0; i < numTiles; i++)
    {
        auto* element = &tileElements.emplace_back();
        element->ClearAs(TileElementType::Surface);
        element->setLastForTile(true);
        element->asSurface()->SetSlope(kTileSlopeFlat);
        element->asSurface()->SetWaterHeight(0);
        element->asSurface()->SetSurfaceObjectIndex(0);
        element->asSurface()->SetEdgeObjectIndex(0);
        element->asSurface()->SetGrassLength(GRASS_LENGTH_CLEAR_0);
        element->asSurface()->SetOwnership(OWNERSHIP_OWNED);
        element->asSurface()->SetParkFences(0);
    }

    SetTileElements(gameState, std::move(tileElements));
}

bool TrackDesignAreEntranceAndExitPlaced()
{