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@ -2034,7 +2034,17 @@ static void HandleLocomotiveSmokeCloud(const Train *v)
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{
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bool sound = false;
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if ((v->vehstatus & VS_TRAIN_SLOWING) || v->cur_speed < 2) {
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/* Do not show any locomotive smoke/sparks when smoke_amount is set to none (0) or train is:
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* slowing down or stopped (by the player) or
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* it is ordered to reverse direction (by player) so it is slowing down to do it or
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* its current speed is less than 2 km-ish/h or
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* it is entering station with an order to stop there and its speed is equal to maximum station entering speed. */
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if (_settings_game.vehicle.smoke_amount == 0 ||
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v->vehstatus & (VS_TRAIN_SLOWING | VS_STOPPED) ||
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HasBit(v->flags, VRF_REVERSING) ||
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v->cur_speed < 2 ||
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(IsRailStationTile(v->tile) && v->IsFrontEngine() && v->current_order.ShouldStopAtStation(v, GetStationIndex(v->tile)) &&
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v->cur_speed >= v->Train::GetCurrentMaxSpeed())) {
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return;
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}
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@ -2076,24 +2086,45 @@ static void HandleLocomotiveSmokeCloud(const Train *v)
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switch (effect_type) {
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case 0:
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/* steam smoke. */
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if (GB(v->tick_counter, 0, 4) == 0) {
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/* Steam smoke - amount is gradually falling until train reaches its maximum speed, after that it's normal.
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* Details: while train's current speed is gradually increasing, steam plumes' density decreases by one third each
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* third of its maximum speed spectrum. Steam emission finally normalises at very close to train's maximum speed.
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* REGULATION:
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* - instead of 1, 4 / 2^smoke_amount (max. 2) is used to provide sufficient regulation to steam puffs' amount. */
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if (GB(v->tick_counter, 0, ((4 >> _settings_game.vehicle.smoke_amount) + ((u->cur_speed * 3) / u->tcache.cached_max_speed))) == 0) {
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CreateEffectVehicleRel(v, x, y, 10, EV_STEAM_SMOKE);
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sound = true;
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}
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break;
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case 1:
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/* diesel smoke */
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if (u->cur_speed <= 40 && Chance16(15, 128)) {
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/* Diesel smoke - thicker when train is starting, gradually subsiding till locomotive reaches its maximum speed
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* when it stops.
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* Details: Train's (max.) speed spectrum is divided into 32 parts. When max. speed is reached, chance for smoke
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* emission erodes by 32 (1/4). Power and train's weight come in handy too to either increase smoke emission in
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* 6 steps (1000HP each) if the power is low or decrease smoke emission in 6 steps (512 tonnes each) if the train
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* isn't overweight. Power and weight contributions are expressed in a way that neither extreme power, nor
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* extreme weight can ruin the balance (e.g. FreightWagonMultiplier) in the formula. When the train reaches
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* maximum speed no diesel_smoke is emitted as train has enough traction to keep locomotive running optimally.
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* REGULATION:
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* - up to which speed a diesel train is emitting smoke (with reduced/small setting only until 1/2 of max_speed),
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* - in Chance16 - the last value is 512 / 2^smoke_amount (max. smoke when 128 = smoke_amount of 2). */
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if (u->cur_speed < (u->tcache.cached_max_speed >> (2 >> _settings_game.vehicle.smoke_amount)) &&
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Chance16((64 - ((u->cur_speed << 5) / u->tcache.cached_max_speed) + (32 >> (u->acc_cache.cached_power >> 10)) - (32 >> (u->acc_cache.cached_weight >> 9))), (512 >> _settings_game.vehicle.smoke_amount))) {
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CreateEffectVehicleRel(v, 0, 0, 10, EV_DIESEL_SMOKE);
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sound = true;
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}
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break;
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case 2:
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/* blue spark */
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if (GB(v->tick_counter, 0, 2) == 0 && Chance16(1, 45)) {
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/* Electric train's spark - more often occurs when train is departing (more load)
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* Details: Electric locomotives are usually at least twice as powerful as their diesel counterparts, so spark
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* emissions are kept simple. Only when starting, creating huge force are sparks more likely to happen, but when
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* reaching its max. speed, quarter by quarter of it, chance decreases untill the usuall 2,22% at train's top speed.
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* REGULATION:
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* - in Chance16 the last value is 360 / 2^smoke_amount (max. sparks when 90 = smoke_amount of 2). */
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if (GB(v->tick_counter, 0, 2) == 0 &&
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Chance16((6 - ((u->cur_speed << 2) / u->tcache.cached_max_speed)), (360 >> _settings_game.vehicle.smoke_amount))) {
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CreateEffectVehicleRel(v, 0, 0, 10, EV_ELECTRIC_SPARK);
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sound = true;
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}
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yexo
14 years ago