#ifndef __AVR__
    /* This little block of code is to substitute for the Arduino
       LiquidCrystal library, in order to enable compilation and
       testing on non-Arduino platforms.  For Arduino, you just need
       to have a global variable called "lcd" that is a pointer to a
       LiquidCrystal.
     */

    #include <iostream>

    using std::cout;
    using std::endl;

    struct LiquidCrystal {
      void clear()
      {
        cout << "-----" << endl;
      }
      void setCursor(int x, int y)
      {
        cout << endl;
      }
      void print(const char *s)
      {
        cout << s;
      }
    } _lcd, *lcd = &_lcd;
#endif

struct lcd_canvas {
  static void
  clear(void *)
  {
    lcd->clear();
    lcd->setCursor(0, 0);
  }

  static void
  print(void *, int y, const char *s)
  {
    if (0 <= y && y <= 1) lcd->print(s);
  }

  static void
  println(void *, int y, const char *line)
  {
    if (0 <= y && y <= 1) {
      lcd->print(line);
      lcd->setCursor(0, y+1);
    }
  }
};