void tablet::init(char* options) {
  
  c = new canvas(this,".canvas",options);
  c->configure("-relief sunken -background white");
  c->geometry(200,100);
  c->region(0,0,800,800);
  
  scrollbar* scrollx = new scrollbar(this,".scrollx");
  scrollx->orient("horizontal");
  scrollx->pack("-side bottom -fill x");
  
  scrollbar* scrolly = new scrollbar(this,".scrolly");
  scrolly->orient("vertical");
  scrolly->pack("-side right -fill y");
  
  c->pack();
  
  c->xscroll(scrollx); scrollx->xview(c);
  c->yscroll(scrolly); scrolly->yview(c);
  }
  

slide: Building the tablet