ColorFaderAffector.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;

namespace Axiom.ParticleFX{
  /// <summary>
  /// Summary description for ColorFaderAffector.
  /// </summary>
  public class ColorFaderAffector : ParticleAffector {
    protected float alphaAdjust;
    protected float redAdjust;
    protected float greenAdjust;
    protected float blueAdjust;

    public ColorFaderAffector() {
      this.type = "ColourFader";
    }

    public float AlphaAdjust {
      get { 
        return alphaAdjust; 
      }
      set { 
        alphaAdjust = value; 
      }
    }

    public float RedAdjust {
      get { 
        return redAdjust; 
      }
      set { 
        redAdjust = value; 
      }
    }

    public float GreenAdjust {
      get { 
        return greenAdjust; 
      }
      set { 
        greenAdjust = value; 
      }
    }

    public float BlueAdjust {
      get { 
        return blueAdjust; 
      }
      set { 
        blueAdjust = value; 
      }
    }

    protected void AdjustWithClamp(ref float component, float adjust) {
      component += adjust;

      // limit to range [0,1]
      if(component < 0.0f)
        component = 0.0f;
      else if(component > 1.0f)
        component = 1.0f;
    }

    public override void InitParticle(ref Particle particle) {
    }

    public override void AffectParticles(ParticleSystem system, float timeElapsed) {
      float da, dr, dg, db;

      da = alphaAdjust * timeElapsed;
      dr = redAdjust * timeElapsed;
      dg = greenAdjust * timeElapsed;
      db = blueAdjust * timeElapsed;

      // loop through the particles

      for(int i = 0; i < system.Particles.Count; i++) {
        Particle p = (Particle)system.Particles[i];

        // adjust the values with clamping ([0,1] in this case)
        AdjustWithClamp(ref p.Color.a, da);
        AdjustWithClamp(ref p.Color.r, dr);
        AdjustWithClamp(ref p.Color.g, dg);
        AdjustWithClamp(ref p.Color.b, db);

      }
    }

    #region Command definition classes

    [Command("red", "Red component.", typeof(ParticleAffector))]
    class RedCommand : ICommand {
      #region ICommand Members

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

      #endregion
    }

    [Command("green", "Green component.", typeof(ParticleAffector))]
    class GreenCommand : ICommand {
      #region ICommand Members

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

      #endregion
    }

    [Command("blue", "Blue component.", typeof(ParticleAffector))]
    class BlueCommand : ICommand {
      #region ICommand Members

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

      #endregion
    }

    [Command("alpha", "Alpha component.", typeof(ParticleAffector))]
    class AlphaCommand : ICommand {
      #region ICommand Members

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

      #endregion
    }

    #endregion Command definition classes
  }
}