code: public void setColor(float r, float g, float b, float a) {
  		if (color == Color.white) {
  			color = new Color(r,g,b,a);
  		} else {
  			color.r = r;
  			color.g = g;
  			color.b = b;
  			color.a = a;
  		}
  	}
docs: Set the color of the particle
  
  @param r
  The red component of the color
  @param g
  The green component of the color
  @param b
  The blue component of the color
  @param a
  The alpha component of the color