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(svn r20303) -Feature: [NewGRF] Air drag property support for trains and road vehicles. Air drag for vehicles with air drag not set or set to zero will use a default value depending on their max speed.

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terkhen
2010-08-02 14:54:47 +00:00
parent 7d0297f967
commit cded122da5
2 changed files with 16 additions and 1 deletions
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15
src/ground_vehicle.cpp
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@@ -46,7 +46,20 @@ void GroundVehicle<T, Type>::PowerChanged()
}
this->acc_cache.cached_axle_resistance = 60 * number_of_parts;
this->acc_cache.cached_air_drag = 20 + 3 * number_of_parts;
byte air_drag;
byte air_drag_value = v->GetAirDrag();
/* If air drag is set to zero (default), the resulting air drag coefficient is dependent on max speed. */
if (air_drag_value == 0) {
/* Simplification of the method used in TTDPatch. It uses <= 10 to change more steadily from 128 to 196. */
air_drag = (max_track_speed <= 10) ? 192 : max(2048 / max_track_speed, 1);
} else {
/* According to the specs, a value of 0x01 in the air drag property means "no air drag". */
air_drag = (air_drag_value == 1) ? 0 : air_drag_value;
}
this->acc_cache.cached_air_drag = air_drag + 3 * air_drag * number_of_parts / 20;
max_te *= 10000; // Tractive effort in (tonnes * 1000 * 10 =) N.
max_te /= 256; // Tractive effort is a [0-255] coefficient.