RotationAffector.cs :  » Game » RealmForge » Axiom » ParticleFX » C# / CSharp Open Source

#region LGPL License
/*
Axiom Game Engine Library
Copyright (C) 2003  Axiom Project Team

The overall design, and a majority of the core engine and rendering code 
contained within this library is a derivative of the open source Object Oriented 
Graphics Engine OGRE, which can be found at http://ogre.sourceforge.net.  
Many thanks to the OGRE team for maintaining such a high quality project.

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#endregion

using System;
using Axiom.Core;
using Axiom.ParticleSystems;
using Axiom.Scripting;
using Axiom.MathLib;

namespace Axiom.ParticleFX{
  /// <summary>
  /// Summary description for ScaleAffector.
  /// </summary>
  public class RotationAffector : ParticleAffector {
    #region Fields

    /// <summary>
    ///    Initial rotation speed of particles (range start).
    /// </summary>
    float rotationSpeedRangeStart;
    /// <summary>
    ///    Initial rotation speed of particles (range end).
    /// </summary>
    float rotationSpeedRangeEnd;
    /// <summary>
    ///    Initial rotation angle of particles (range start).
    /// </summary>
    float rotationRangeStart;
    /// <summary>
    ///    Initial rotation angle of particles (range end)
    /// </summary>
    float rotationRangeEnd;

    #endregion Fields

    public RotationAffector() {
      this.type = "Rotator";
      rotationSpeedRangeStart = 0;
      rotationSpeedRangeEnd = 0;
      rotationRangeStart = 0;
      rotationRangeEnd = 0;
    }

    public override void InitParticle(ref Particle particle) {
      particle.Rotation = rotationRangeStart + (MathUtil.UnitRandom() * (rotationRangeEnd - rotationRangeStart));
      particle.RotationSpeed = rotationSpeedRangeStart + (MathUtil.UnitRandom() * (rotationSpeedRangeEnd - rotationSpeedRangeStart));
    }

    public override void AffectParticles(ParticleSystem system, float timeElapsed) {
      float ds;

      // Rotation adjustments by time
      ds = timeElapsed;

      float newRotation;

      // loop through the particles
      for(int i = 0; i < system.Particles.Count; i++) {
        Particle p = (Particle)system.Particles[i];

        newRotation = p.Rotation + (ds * p.RotationSpeed);
        p.Rotation = newRotation;
      }
    }

    #region Command definition classes

    [Command("rotation_speed_range_start", "Start range of particle rotation speed.", typeof(ParticleAffector))]
      class RotationSpeedRangeStartCommand : ICommand {
      #region ICommand Members

      public string Get(object target) {
        RotationAffector affector = target as RotationAffector;
        return StringConverter.ToString(affector.rotationSpeedRangeStart);
      }
      public void Set(object target, string val) {
        RotationAffector affector = target as RotationAffector;
        affector.rotationSpeedRangeStart = StringConverter.ParseFloat(val);
      }

      #endregion
    }

    [Command("rotation_speed_range_end", "End range of particle rotation speed.", typeof(ParticleAffector))]
    class RotationSpeedRangeEndCommand : ICommand {
      #region ICommand Members

      public string Get(object target) {
        RotationAffector affector = target as RotationAffector;
        return StringConverter.ToString(affector.rotationSpeedRangeEnd);
      }
      public void Set(object target, string val) {
        RotationAffector affector = target as RotationAffector;
        affector.rotationSpeedRangeEnd = StringConverter.ParseFloat(val);
      }

      #endregion
    }

    [Command("rotation_range_start", "Start range of particle rotation.", typeof(ParticleAffector))]
    class RotationRangeStartCommand : ICommand {
      #region ICommand Members

      public string Get(object target) {
        RotationAffector affector = target as RotationAffector;
        return StringConverter.ToString(affector.rotationRangeStart);
      }
      public void Set(object target, string val) {
        RotationAffector affector = target as RotationAffector;
        affector.rotationRangeStart = StringConverter.ParseFloat(val);
      }

      #endregion
    }


    [Command("rotation_range_end", "End range of particle rotation.", typeof(ParticleAffector))]
    class RotationRangeEndCommand : ICommand {
      #region ICommand Members

      public string Get(object target) {
        RotationAffector affector = target as RotationAffector;
        return StringConverter.ToString(affector.rotationRangeEnd);
      }
      public void Set(object target, string val) {
        RotationAffector affector = target as RotationAffector;
        affector.rotationRangeEnd = StringConverter.ParseFloat(val);
      }

      #endregion
    }

    #endregion Command definition classes
  }
}