if (!roiOnOff) presentation.removeFromLayer(); else {
if (!roiOnOff){ presentation.getBottomBar().resetMessage(BottomBar.LENS); presentation.removeCanvasFromLayer(); } else { presentation.getBottomBar().resetMessage(BottomBar.ANNOTATE);
    public void setRoiOnOff(boolean b)    {        roiOnOff = b;        if (!roiOnOff) presentation.removeFromLayer();        else {            paintDrawing();            presentation.addToLayer();             presentation.resetLens();        }    }