Hue fading with sprite.tone

[xRythx]

hrmm, I'm not too sure what I'm trying to do is called. I have a sprite. On the update function of the scene I'm trying to make this sprite fade from -255(RGB) to 255 then back to -255 continuously. is there some way i can use Math::Sin() to do this?

this is my current code which creates an okay effect.

def update_command

    @sprite.tone = Tone.new(@spr,@spg,@spb)
    
        
    if @reverse != true
      @spr += 2
      @spg += 3
      @spb += 7
    else
      @spr -= 2
      @spg -= 3 
      @spb -= 7
    end
   
    if @spr >= 255 then
      @reverse = true
    end
    if @spr <= -255 then
      @reverse = false
    end

 

[linkz0r]

@sprite.tone = Tone.new(@spr, @spg, @spb)

@step = 1
@c = ((!@c.nil? && @c >= 359) ? 0 : [@c + @step, 359].min)
@spr = @spg = @spb = 255 * Math.sin((@c*Math::PI)/180)

I think that should do, but just note that sine calculations have more overhead than normal methods (like yours).

 

[xRythx]

hrm how can '+' be an undefined method?! its an operator.

 

[arev]

The variable you're tryin' to treat with it is probably undefined.