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using System;
using System.Collections.Generic;
using System.Reflection;
using log4net;
using OpenMetaverse;
using OpenSim.Region.CoreModules.World.Wind;
namespace OpenSim.Region.CoreModules.World.Wind.Plugins
{
class ConfigurableWind : Mono.Addins.TypeExtensionNode, IWindModelPlugin
{
private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
private Vector2[] m_windSpeeds = new Vector2[16 * 16];
private Random m_rndnums = new Random(Environment.TickCount);
private float m_avgStrength = 5.0f; // Average magnitude of the wind vector
private float m_avgDirection = 0.0f; // Average direction of the wind in degrees
private float m_varStrength = 5.0f; // Max Strength Variance
private float m_varDirection = 30.0f;// Max Direction Variance
private float m_rateChange = 1.0f; //
private Vector2 m_curPredominateWind = new Vector2();
#region IPlugin Members
public string Version
{
get { return "1.0.0.0"; }
}
public string Name
{
get { return "ConfigurableWind"; }
}
public void Initialise()
{
}
#endregion
#region IDisposable Members
public void Dispose()
{
m_windSpeeds = null;
}
#endregion
#region IWindModelPlugin Members
public void WindConfig(OpenSim.Region.Framework.Scenes.Scene scene, Nini.Config.IConfig windConfig)
{
if( windConfig != null )
{
// Uses strength value if avg_strength not specified
m_avgStrength = windConfig.GetFloat("strength", 5.0F);
m_avgStrength = windConfig.GetFloat("avg_strength", 5.0F);
m_avgDirection = windConfig.GetFloat("avg_direction", 0.0F);
m_varStrength = windConfig.GetFloat("var_strength", 5.0F);
m_varDirection = windConfig.GetFloat("var_direction", 30.0F);
m_rateChange = windConfig.GetFloat("rate_change", 1.0F);
LogSettings();
}
}
public void WindUpdate(uint frame)
{
double avgAng = m_avgDirection * (Math.PI/180.0f);
double varDir = m_varDirection * (Math.PI/180.0f);
// Prevailing wind algorithm
// Inspired by Kanker Greenacre
// TODO:
// * This should probably be based on in-world time.
// * should probably move all these local variables to class members and constants
double time = DateTime.Now.TimeOfDay.Seconds / 86400;
double theta = time * (2 * Math.PI) * m_rateChange;
double offset = Math.Sin(theta) * Math.Sin(theta*2) * Math.Sin(theta*9) * Math.Cos(theta*4);
double windDir = avgAng + (varDir * offset);
offset = Math.Sin(theta) * Math.Sin(theta*4) + (Math.Sin(theta*13) / 3);
double windSpeed = m_avgStrength + (m_varStrength * offset);
if (windSpeed<0)
windSpeed=0;
m_curPredominateWind.X = (float)Math.Cos(windDir);
m_curPredominateWind.Y = (float)Math.Sin(windDir);
m_curPredominateWind.Normalize();
m_curPredominateWind.X *= (float)windSpeed;
m_curPredominateWind.Y *= (float)windSpeed;
for (int y = 0; y < 16; y++)
{
for (int x = 0; x < 16; x++)
{
m_windSpeeds[y * 16 + x] = m_curPredominateWind;
}
}
}
public Vector3 WindSpeed(float fX, float fY, float fZ)
{
return new Vector3(m_curPredominateWind, 0.0f);
}
public Vector2[] WindLLClientArray()
{
return m_windSpeeds;
}
public string Description
{
get
{
return "Provides a predominate wind direction that can change within configured variances for direction and speed.";
}
}
public System.Collections.Generic.Dictionary<string, string> WindParams()
{
Dictionary<string, string> Params = new Dictionary<string, string>();
Params.Add("avgStrength", "average wind strength");
Params.Add("avgDirection", "average wind direction in degrees");
Params.Add("varStrength", "allowable variance in wind strength");
Params.Add("varDirection", "allowable variance in wind direction in +/- degrees");
Params.Add("rateChange", "rate of change");
return Params;
}
public void WindParamSet(string param, float value)
{
switch (param)
{
case "avgStrength":
m_avgStrength = value;
break;
case "avgDirection":
m_avgDirection = value;
break;
case "varStrength":
m_varStrength = value;
break;
case "varDirection":
m_varDirection = value;
break;
case "rateChange":
m_rateChange = value;
break;
}
}
public float WindParamGet(string param)
{
switch (param)
{
case "avgStrength":
return m_avgStrength;
case "avgDirection":
return m_avgDirection;
case "varStrength":
return m_varStrength;
case "varDirection":
return m_varDirection;
case "rateChange":
return m_rateChange;
default:
throw new Exception(String.Format("Unknown {0} parameter {1}", this.Name, param));
}
}
#endregion
private void LogSettings()
{
m_log.InfoFormat("[ConfigurableWind] Average Strength : {0}", m_avgStrength);
m_log.InfoFormat("[ConfigurableWind] Average Direction : {0}", m_avgDirection);
m_log.InfoFormat("[ConfigurableWind] Varience Strength : {0}", m_varStrength);
m_log.InfoFormat("[ConfigurableWind] Varience Direction : {0}", m_varDirection);
m_log.InfoFormat("[ConfigurableWind] Rate Change : {0}", m_rateChange);
}
#region IWindModelPlugin Members
#endregion
}
}
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