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Simpler statistical calculation of next weather; minus before parens.

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This commit is contained in:
Miroslav Puda 2013-06-19 04:57:36 +02:00
parent 04d90b4c47
commit f01aa8f55e
1 changed files with 31 additions and 37 deletions
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68
apps/openmw/mwworld/weather.cpp
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@ -375,42 +375,36 @@ void WeatherManager::update(float duration)
if (region != 0)
{
float clear = region->mData.mClear/255.f;
float cloudy = region->mData.mCloudy/255.f;
float foggy = region->mData.mFoggy/255.f;
float overcast = region->mData.mOvercast/255.f;
float rain = region->mData.mRain/255.f;
float thunder = region->mData.mThunder/255.f;
float ash = region->mData.mAsh/255.f;
float blight = region->mData.mBlight/255.f;
float snow = region->mData.mA/255.f;
float blizzard = region->mData.mB/255.f;
/*
* All probabilities must add to 100 (responsibility of the user).
* If chances A and B has values 30 and 70 then by generating
* 100 numbers 1..100, 30% will be lesser or equal 30 and
* 70% will be greater than 30 (in theory).
*/
const int probability[] = {
region->mData.mClear,
region->mData.mCloudy,
region->mData.mFoggy,
region->mData.mOvercast,
region->mData.mRain,
region->mData.mThunder,
region->mData.mAsh,
region->mData.mBlight,
region->mData.mA,
region->mData.mB
}; // 10 elements
// re-scale to 100 percent
const float total = clear+cloudy+foggy+overcast+rain+thunder+ash+blight+snow+blizzard;
float random = ((rand()%100)/100.f) * total;
if (random >= snow+blight+ash+thunder+rain+overcast+foggy+cloudy+clear)
weatherType = Weather::Type_Blizzard;
else if (random >= blight+ash+thunder+rain+overcast+foggy+cloudy+clear)
weatherType = Weather::Type_Snow;
else if (random >= ash+thunder+rain+overcast+foggy+cloudy+clear)
weatherType = Weather::Type_Blight;
else if (random >= thunder+rain+overcast+foggy+cloudy+clear)
weatherType = Weather::Type_Ashstorm;
else if (random >= rain+overcast+foggy+cloudy+clear)
weatherType = Weather::Type_Thunderstorm;
else if (random >= overcast+foggy+cloudy+clear)
weatherType = Weather::Type_Rain;
else if (random >= foggy+cloudy+clear)
weatherType = Weather::Type_Overcast;
else if (random >= cloudy+clear)
weatherType = Weather::Type_Foggy;
else if (random >= clear)
weatherType = Weather::Type_Cloudy;
else
weatherType = Weather::Type_Clear;
int chance = (rand() % 100) + 1; // 1..100
int sum = 0;
for (int i = 0; i < 10; ++i)
{
sum += probability[i];
if (chance < sum)
{
weatherType = (Weather::Type)i;
break;
}
}
}
}
@ -461,8 +455,8 @@ void WeatherManager::update(float duration)
int facing = (mHour > 13.f) ? 1 : -1;
Vector3 final(
-(1 - height) * facing,
-(1 - height) * facing,
(height - 1) * facing,
(height - 1) * facing,
height);
mRendering->setSunDirection(final);