import static com.twosigma.beakerx.groovy.widgets.Interactive.interact

class DataHolder{
    static Plot plot = null;
}

public static Object f(a,b){
    if (DataHolder.plot == null){
        DataHolder.plot = new Plot(title: "Lissajous Curves")
    }

    List t = (1..1000)
    List x = t.collect { it -> sin(it*a/100)}
    List y = t.collect { it -> cos(it*b/100)}
    
    DataHolder.plot.getGraphics().clear()
    DataHolder.plot.add(new Line(x: x, y: y))
    return DataHolder.plot 
}

interact(this.&f, 3d, -3d);