diff options
| -rw-r--r-- | src/newgrf_engine.cpp | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/src/newgrf_engine.cpp b/src/newgrf_engine.cpp index 80e249710..5dd020f61 100644 --- a/src/newgrf_engine.cpp +++ b/src/newgrf_engine.cpp @@ -652,6 +652,34 @@ static uint32 VehicleGetVariable(Vehicle *v, const ResolverObject *object, byte } return 0; + case 0x62: { // Curvature/position difference for n-th vehicle in chain [signed number relative to vehicle] + /* Format: zzyyxxFD + * zz - Signed difference of z position between the selected and this vehicle. + * yy - Signed difference of y position between the selected and this vehicle. + * xx - Signed difference of x position between the selected and this vehicle. + * F - Flags, bit 7 corresponds to VS_HIDDEN. + * D - Dir difference, like in 0x45. + */ + if (!v->IsGroundVehicle()) return 0; + + const Vehicle *u = v->Move((int8)parameter); + if (u == NULL) return 0; + + /* Get direction difference. */ + bool prev = (int8)parameter < 0; + uint32 ret = prev ? DirDifference(u->direction, v->direction) : DirDifference(v->direction, u->direction); + if (ret > DIRDIFF_REVERSE) ret |= 0x08; + + if (u->vehstatus & VS_HIDDEN) ret |= 0x80; + + /* Get position difference. */ + ret |= ((prev ? u->x_pos - v->x_pos : v->x_pos - u->x_pos) & 0xFF) << 8; + ret |= ((prev ? u->y_pos - v->y_pos : v->y_pos - u->y_pos) & 0xFF) << 16; + ret |= ((prev ? u->z_pos - v->z_pos : v->z_pos - u->z_pos) & 0xFF) << 24; + + return ret; + } + case 0xFE: case 0xFF: { uint16 modflags = 0; |