Method doRoad

MicropolisCore/src/MicropolisEngine/src/simulate.cpp:1052–1113

* Handle road tile. * @param pos Position of the road. */

 * @param pos Position of the road.
 */
void Micropolis::doRoad(const Position &pos)
{
    short tden, z;
    static const short densityTable[3] = { ROADBASE, LTRFBASE, HTRFBASE };

    roadTotal++;

    MapValue mapValue = map[pos.posX][pos.posY];
    MapTile tile = mapValue & LOMASK;

    /* generateBus(pos.posX, pos.posY); */

    if (roadEffect < (15 * MAX_ROAD_EFFECT / 16)) {
        // roadEffect < 15/16 of max road, enable deteriorating road
        if ((getRandom16() & 511) == 0) {
            if (!(mapValue & CONDBIT)) {
                assert(MAX_ROAD_EFFECT == 32); // Otherwise the '(getRandom16() & 31)' makes no sense
                if (roadEffect < (getRandom16() & 31)) {
                    if ((tile & 15) < 2 || (tile & 15) == 15) {
                        map[pos.posX][pos.posY] = RIVER;
                    } else {
                        map[pos.posX][pos.posY] = randomRubble();
                    }
                    return;
                }
            }
        }
    }

    if ((mapValue & BURNBIT) == 0) { /* If Bridge */
        roadTotal += 4; // Bridge counts as 4 road tiles
        if (doBridge(Position(pos.posX, pos.posY), tile)) {
            return;
        }
    }

    if (tile < LTRFBASE) {
        tden = 0;
    } else if (tile < HTRFBASE) {
        tden = 1;
    } else {
        roadTotal++; // Heavy traffic counts as 2 roads.
        tden = 2;
    }

    short trafficDensity = trafficDensityMap.worldGet(pos.posX, pos.posY) >>6;

    if (trafficDensity > 1) {
        trafficDensity--;
    }

    if (tden != trafficDensity) { /* tden 0..2   */
        z = ((tile - ROADBASE) & 15) + densityTable[trafficDensity];
        z |= mapValue & (ALLBITS - ANIMBIT);

        if (trafficDensity > 0) {
            z |= ANIMBIT;
        }