button

function touch(xmin,xmax,ymin,ymax)
local b,e,x,y=os.pullEvent("mouse_click")
if e=="mouse_click" then
 if b=="1" then
    if x >= xmin and x <= xmax and y >= ymin and y <= ymax then
       return "c1"
       elseif
        e=="mouse_click" then
          if b=="2" then
            if x>=xmin and x<=xmax and y>=ymin and y<=ymax then
            return "c2"
           else
           end
         end
      end
    end
  end
end