class muscle
{
  boolean useMuscle=false;
  float curLength;  
  float defLength;
  float minLength;
  
  float relaxRate=.2;
  float contractRate=.5;
  
  boolean relax=true;
  boolean relaxed=true;
  boolean contracting=false;
  muscle(float l)
  {
    curLength=defLength=l;
    minLength=defLength*.2;
//    minLength=constrain(minLength,8,100);
  }
  void update()
  {
    if(contracting&&!relax)
    {
      relaxed=false;
      curLength-=contractRate;
      if(curLength<minLength)
      {
        curLength=minLength;
        contracting=false;
        relax=true;
      }
    }
    if(relax)
    {
      curLength+=relaxRate;
      if(curLength>defLength)
      {
        curLength=defLength;
        relaxed=true;
      }
    }
  }
  void contract()
  {
//    if(relaxed)
//    {
      contracting=true;
      relax=false;      
//    }
  }
}