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Fix #6920: Make 9.8m/s^2 a common constant for TE-calculation

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This commit is contained in:
Johannes E. Krause
2018-09-29 13:26:44 +02:00
committed by Michael Lutz
parent 060248a422
commit 662dcc3c31
4 changed files with 8 additions and 6 deletions
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4
src/engine.cpp
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@@ -431,9 +431,9 @@ uint Engine::GetDisplayMaxTractiveEffort() const
/* Only trains and road vehicles have 'tractive effort'. */
switch (this->type) {
case VEH_TRAIN:
return (10 * this->GetDisplayWeight() * GetEngineProperty(this->index, PROP_TRAIN_TRACTIVE_EFFORT, this->u.rail.tractive_effort)) / 256;
return (GROUND_ACCELERATION * this->GetDisplayWeight() * GetEngineProperty(this->index, PROP_TRAIN_TRACTIVE_EFFORT, this->u.rail.tractive_effort)) / 256 / 1000;
case VEH_ROAD:
return (10 * this->GetDisplayWeight() * GetEngineProperty(this->index, PROP_ROADVEH_TRACTIVE_EFFORT, this->u.road.tractive_effort)) / 256;
return (GROUND_ACCELERATION * this->GetDisplayWeight() * GetEngineProperty(this->index, PROP_ROADVEH_TRACTIVE_EFFORT, this->u.road.tractive_effort)) / 256 / 1000;
default: NOT_REACHED();
}

2
src/ground_vehicle.cpp
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@@ -58,7 +58,7 @@ void GroundVehicle<T, Type>::PowerChanged()
this->gcache.cached_air_drag = air_drag + 3 * air_drag * number_of_parts / 20;
max_te *= 9800; // Tractive effort in (tonnes * 1000 * 9.8 =) N.
max_te *= GROUND_ACCELERATION; // Tractive effort in (tonnes * 1000 * 9.8 =) N.
max_te /= 256; // Tractive effort is a [0-255] coefficient.
if (this->gcache.cached_power != total_power || this->gcache.cached_max_te != max_te) {
/* Stop the vehicle if it has no power. */

2
src/vehicle_type.h
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@@ -17,6 +17,8 @@
/** The type all our vehicle IDs have. */
typedef uint32 VehicleID;
static const int GROUND_ACCELERATION = 9800; ///< Acceleration due to gravity, 9.8 m/s^2
/** Available vehicle types. */
enum VehicleType {
VEH_BEGIN,