mirror of https://github.com/OpenTTD/OpenTTD.git
(svn r3784) Add a type and functions to handle direction changes
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@ -764,7 +764,7 @@ static bool AircraftController(Vehicle *v)
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Station *st;
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const AirportMovingData *amd;
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Vehicle *u;
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byte z,dirdiff,newdir,maxz,curz;
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byte z,newdir,maxz,curz;
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GetNewVehiclePosResult gp;
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uint dist;
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int x,y;
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@ -853,20 +853,22 @@ static bool AircraftController(Vehicle *v)
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// At final pos?
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if (dist == 0) {
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DirDiff dirdiff;
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if (v->cur_speed > 12) v->cur_speed = 12;
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// Change direction smoothly to final direction.
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dirdiff = amd->direction - v->direction;
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dirdiff = DirDifference(amd->direction, v->direction);
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// if distance is 0, and plane points in right direction, no point in calling
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// UpdateAircraftSpeed(). So do it only afterwards
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if (dirdiff == 0) {
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if (dirdiff == DIRDIFF_SAME) {
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v->cur_speed = 0;
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return true;
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}
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if (!UpdateAircraftSpeed(v)) return false;
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v->direction = (v->direction+((dirdiff&7)<5?1:-1)) & 7;
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v->direction = ChangeDir(v->direction, dirdiff > DIRDIFF_REVERSE ? DIRDIFF_45LEFT : DIRDIFF_45RIGHT);
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v->cur_speed >>= 1;
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SetAircraftPosition(v, v->x_pos, v->y_pos, v->z_pos);
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26
direction.h
26
direction.h
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@ -23,6 +23,32 @@ static inline Direction ReverseDir(Direction d)
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}
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typedef enum DirDiff {
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DIRDIFF_SAME = 0,
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DIRDIFF_45RIGHT = 1,
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DIRDIFF_90RIGHT = 2,
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DIRDIFF_REVERSE = 4,
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DIRDIFF_90LEFT = 6,
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DIRDIFF_45LEFT = 7
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} DirDiff;
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static inline DirDiff DirDifference(Direction d0, Direction d1)
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{
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return (DirDiff)(d0 + 8 - d1) % 8;
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}
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static inline DirDiff ChangeDirDiff(DirDiff d, DirDiff delta)
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{
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return (DirDiff)((d + delta) % 8);
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}
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static inline Direction ChangeDir(Direction d, DirDiff delta)
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{
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return (Direction)((d + delta) % 8);
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}
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/* Direction commonly used as the direction of entering and leaving tiles, 4-way */
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typedef enum DiagDirection {
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DIAGDIR_NE = 0, /* Northeast, upper right on your monitor */
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17
train_cmd.c
17
train_cmd.c
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@ -2591,14 +2591,16 @@ static const RailtypeSlowdownParams _railtype_slowdown[3] = {
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/* Modify the speed of the vehicle due to a turn */
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static void AffectSpeedByDirChange(Vehicle* v, Direction new_dir)
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{
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byte diff;
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DirDiff diff;
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const RailtypeSlowdownParams *rsp;
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if (_patches.realistic_acceleration || (diff = (v->direction - new_dir) & 7) == 0)
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return;
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if (_patches.realistic_acceleration) return;
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diff = DirDifference(v->direction, new_dir);
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if (diff == DIRDIFF_SAME) return;
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rsp = &_railtype_slowdown[v->u.rail.railtype];
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v->cur_speed -= ((diff == 1 || diff == 7) ? rsp->small_turn : rsp->large_turn) * v->cur_speed >> 8;
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v->cur_speed -= (diff == DIRDIFF_45RIGHT || diff == DIRDIFF_45LEFT ? rsp->small_turn : rsp->large_turn) * v->cur_speed >> 8;
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}
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/* Modify the speed of the vehicle due to a change in altitude */
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@ -2739,11 +2741,10 @@ static void *CheckVehicleAtSignal(Vehicle *v, void *data)
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{
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const VehicleAtSignalData* vasd = data;
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if (v->type == VEH_Train && IsFrontEngine(v) &&
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v->tile == vasd->tile) {
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byte diff = (v->direction - vasd->direction + 2) & 7;
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if (v->type == VEH_Train && IsFrontEngine(v) && v->tile == vasd->tile) {
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DirDiff diff = ChangeDirDiff(DirDifference(v->direction, vasd->direction), DIRDIFF_90RIGHT);
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if (diff == 2 || (v->cur_speed <= 5 && diff <= 4)) return v;
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if (diff == DIRDIFF_90RIGHT || (v->cur_speed <= 5 && diff <= DIRDIFF_REVERSE)) return v;
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}
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return NULL;
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}
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@ -1930,7 +1930,7 @@ static const Direction _new_direction_table[] = {
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Direction GetDirectionTowards(const Vehicle* v, int x, int y)
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{
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Direction dir;
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byte dirdiff;
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DirDiff dirdiff;
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int i = 0;
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if (y >= v->y_pos) {
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@ -1945,10 +1945,9 @@ Direction GetDirectionTowards(const Vehicle* v, int x, int y)
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dir = v->direction;
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dirdiff = _new_direction_table[i] - dir;
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if (dirdiff == 0)
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return dir;
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return (dir+((dirdiff&7)<5?1:-1)) & 7;
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dirdiff = DirDifference(_new_direction_table[i], dir);
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if (dirdiff == DIRDIFF_SAME) return dir;
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return ChangeDir(dir, dirdiff > DIRDIFF_REVERSE ? DIRDIFF_45LEFT : DIRDIFF_45RIGHT);
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}
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Trackdir GetVehicleTrackdir(const Vehicle* v)
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