#include <Arduino.h>
/************************************************************************
   OLED DISPLAY
 ************************************************************************
   INCLUDES
 ************************************************************************/
#include <U8g2lib.h>
U8G2_SSD1306_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);
//U8G2_SSD1306_128X32_UNIVISION_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);


int SCREEN_WIDTH;
int SCREEN_HEIGHT;
int USABLE_SCREEN_WIDTH;
/*
  #define SCREEN_WIDTH                    u8g2.getDisplayWidth()
  #define SCREEN_HEIGHT                   u8g2.getDisplayHeight()
*/
/************************************************************************
   u8g2:
 ************************************************************************
   Bitmaps
 ************************************************************************/




#define BUTTON_UP_PIN 41 // pin for UP button 
#define BUTTON_SELECT_PIN 40 // pin for SELECT button
#define BUTTON_DOWN_PIN 39 // pin for DOWN button

/*
    5px Height:
    Normal: u8g2_font_4x6_tf
    6px Height:
    Normal: u8g2_font_5x8_tf
    7px Height:
    Normal: u8g2_font_6x10_tf
    9px Height:
    Normal: u8g2_font_6x13_tf
    Bold:   u8g2_font_6x13B_tf
    Alt:    u8g2_font_tpss_tn
    10px Height:
    Normal: u8g2_font_7x14_tf
    Bold:   u8g2_font_7x14B_tf

*/
/*
const uint8_t u8g2_font_tpss_tn[2005] U8G2_FONT_SECTION("u8g2_font_tpss_tn") =
  "\263\0\3\2\4\4\2\5\5\13\21\377\374\11\374\11\0\1X\2\257\7\270 \5\0B\12!\7\221\303"
  "\211\213\0\42\7#\337\212D\11#\13U\303\233\312\240T\6\245\2$\20\225\303\233\245\242d[\22%"
  "J\242T\26\0%\15\225\303\213L\12\263\260\26FZ\0&\21\227\303\234\255\224e[)\213\262(K"
  "\222%\1'\6!\337\11\1(\14\225\303;)\13\263\64LS\1)\14\225\303\13\265\230fa\26i"
  "\0*\13u\307\253Je\313\226\246\10+\12U\307\253\60\32\244\60\2,\6\42\77\32\5-\6\25\317"
  "\213A.\6\21\303\211\0/\14\225\303\313,\314\302Z\230\205\0\60\12\225B\233%\363[\262\0\61\13"
  "\225B\253LJ\302\236\6\1\62\13\225B\233%\323\302\254\343 \63\15\225B\233%\13#\65\14\265d"
  "\1\64\11\225BKM\33\306\36\65\14\225B\213c\70\210E-Y\0\66\15\225B\233%\23\207$s"
  "K\26\0\67\12\225B\213A\314\32\273\1\70\15\225B\233%\323\222%sK\26\0\71\15\225B\233%"
  "\263%C\30j\311\2:\6A\303\211(;\7R\77\232T\1<\10\225\303\313\254k\7=\10\65\313"
  "\213A\35\4>\11\225\303\213\264[G\0\77\15\225\303\233%\13\263b\16\205\21\0@\25\211\303\235a"
  "\212\223HJJISRR\242\34H\206!\1A\13\225B\233%\323\206!\363\26B\15\225B\213!"
  "\311\264A\311\334\6\5C\13\225B\233%\23{K\26\0D\13\225B\213!\311\374\66(\0E\13\225"
  "B\213c\70$a\343 F\13\225B\213c\70$aG\0G\15\225B\233%\23\223!sK\26\0"
  "H\13\225B\213\314\66\14\231\267\0I\6\221B\211\7J\11\225B\313>j\311\2K\16\225B\213\314"
  "\224\224\264$\252dZ\0L\11\225B\213\260\37\7\1M\14\227B\214t[*R\244z\15N\13\225"
  "B\213lR\22i\363\26O\12\225B\233%\363[\262\0P\14\225B\213!\311\264A\11;\2Q\15"
  "\225B\233%\363\222(\211RY\0R\14\225B\213!\311\264A\311\274\5S\14\225B\233%S\327P"
  "\323\222\5T\11\225B\213A\12\373\11U\11\225B\213\314\337\222\5V\17\225B\213\314\226\224\222(\211"
  "\222,\214\0W\21\227B\214\324\232\64%\245\244\226\204I\230D\0X\15\225B\213LKja\226\324"
  "l\1Y\13\225B\213LKjaO\0Z\13\225B\213A\254u\14\7\1[\11\223\303\212!\352\323"
  "\0\134\12u\303\213\64L\213i\0]\11\223\303\212\251OC\0^\6#\353\232\6_\6\26C\214\3"
  "`\6\42k\32\5a\12eB\233%sK\206\0b\14\225B\213\260\70$\231[\262\0c\12eB"
  "\233%\23k\311\2d\13\225B\313\226AsK\206\0e\14eB\233%\33\206\60K\26\0f\13\225"
  "B+\251\222ma\67\0g\15\245\62\233%sK\206\60\324\222\5h\12\225B\213\260\305\244\271\5i"
  "\7\221B\11e\30j\12\322\262\231Z\322/\12\0k\15\225B\213\260))iIT\311\2l\6\221"
  "B\211\7m\16gB\214D\31\22S$ER$\25n\11eB\213\304\244\271\5o\12eB\233%"
  "sK\26\0p\13\245\62\233%s\33\224\260\21q\22\246\262\233!\311\222,\311\222,\32\322pL\23"
  "\0r\12d\302\212d\210\262\66\0s\12eB\233%]\265d\1t\13\224\302\232\254\64$Y'\0"
  "u\11eB\213\314[\262\0v\14eB\213LKJI\26F\0w\16gB\214TM\232\222Z\22"
  "&\21\0x\13eB\213,\251\205YR\13y\15\245\62\213\314[\62\204\241\226,\0z\11eB\233"
  "A\353\66\10{\14\226CL-L\63\71\215c\1|\6\221\303\211\7}\14\226C\14\271\32ki\230"
  "\211\0~\7%j\213E\31\241\7\221B\11e\30\242\15u\303\253l\251(QR\331\42\0\243\14\225"
  "\303\213\60\34\222\260M\33\6\244\13U\307\213,\231\222h\311\2\245\17\225\303\213LKja\64H\321"
  " E\0\246\6\221\303\211m\247\21\246C\234!\211\207$L\206\70M\305dH\0\250\6\25\317\213,"
  "\251\17w\303\234AI\225E\311\224EM\6\5\252\17\206C\234)K\262$K\262h\211\207\1\253\7"
  "\65\313\233Hj\254\7%\313\213A\14\255\5\0B\14\256\17w\303\234AI\225E\311\224LM\6\5"
  "\257\6\25Z\213A\260\7\63\313\232.\0\261\14u\303\253\60\32\244\60\7\6\1\265\5\0B\14\267\5"
  "\0B\14\273\11\65\313\213\250$%\0\300\16\305B\233\64G\226L\33\206\314[\0\301\15\305B\273:"
  "\262d\332\60d\336\2\302\16\305B\253,\311\201%\323\206!\363\26\303\16\305B\213E\231\227L\33\206"
  "\314[\0\304\15\265B\233:\260d\332\60d\336\2\305\17\325B\253,\311rd\311\264a\310\274\5\306"
  "\23\231B\235\341\26f\341\60(Y\230\205Y\230\205\331 \307\14\225:\233%\23\333\222-\223\0\310\16"
  "\305B\233\64\7\216\341\220\204\215\203\0\311\15\305B\273:p\14\207$l\34\4\312\16\305B\253,\211"
  "\207\61\34\222\260q\20\313\15\265B\233\362\60\206C\22\66\16\2\314\11\302A\211(K\372\3\315\11\302"
  "B\31-\351/\0\316\11\303A\231\306\250\277\0\317\12\263A\211$\214\372\13\0\320\15\225B\213!\311"
  "\264!\321\334\6\5\321\16\305B\213EY\63\333\244$\322f\13\322\14\305B\233\64G\226\314o\311\2"
  "\323\14\305B\273:\262d~K\26\0\324\15\305B\253,\311\201%\363[\262\0\325\14\305B\213E\231"
  "\227\314o\311\2\326\14\265B\233:\260d~K\26\0\327\7\63J\213\244\3\330\22\227B\254\245\26E"
  "RRJJII\252%\311\4\331\14\305B\233\64\7\62\177K\26\0\332\13\305B\273:\220\371[\262"
  "\0\333\14\305B\253,\211\63\177K\26\0\334\12\265B\233r\346o\311\2\335\14\305B\273:\220iI"
  "-\354\11\336\15\225B\213\60\34\222lP\302F\0\337\16\265:\213!\311\24%sQ\302F\0\340\14"
  "\225B\233\64G\226\314-\31\2\341\13\225B\273:\262dn\311\20\342\15\225B\253,\311\201%sK"
  "\206\0\343\14\225B\213E\231\227\314-\31\2\344\13\205B\233:\260dn\311\20\345\15\245B\253,\311"
  "rd\311\334\222!\346\16iB\235K\226i\303\26f\225\13\0\347\13\205:\233%\23k\311V\3\350"
  "\14eB\233%\33\206\60K\26\0\351\14eB\233%\33\206\60K\26\0\352\14eB\233%\33\206\60"
  "K\26\0\353\14eB\233%\33\206\60K\26\0\354\10\242\302\211(Mz\355\10\242\302\31\65\351\5\356"
  "\11\243B\232v \352\5\357\12\223B\212$\7\242^\0\360\14\225B\313hL\6\315-\31\2\361\13"
  "\225B\213EY\23\223\346\26\362\14\225B\233\64G\226\314-Y\0\363\13\225B\273:\262dn\311\2"
  "\364\15\225B\253,\311\201%sK\26\0\365\14\225B\213E\231\227\314-Y\0\366\13\205B\233:\260"
  "dn\311\2\367\12UF\253\34\30t \2\370\14eB\233%Z\22%\231\222\5\371\13\225B\233\64"
  "\7\62o\311\2\372\13\225B\273:\220yK\26\0\373\13\225B\253,\211\63o\311\2\374\12\205B\233"
  "r\346-Y\0\375\16\325\62\273:\220yK\206\60\324\222\5\376\14e\302\212pH\262A\11C\0\377"
  "\16\305\62\233r\346-\31\302PK\26\0\0\0\0\4\377\377\0";
*/


void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32-S3!");

  //u8g2.setColorIndex(1);  // set the color to white
  u8g2.begin();
  //u8g2.setBitmapMode(1);

  SCREEN_WIDTH  = u8g2.getDisplayWidth();
  SCREEN_HEIGHT = u8g2.getDisplayHeight();
  USABLE_SCREEN_WIDTH = SCREEN_WIDTH;
  // define pins for buttons
  // INPUT_PULLUP means the button is HIGH when not pressed, and LOW when pressed
  // since it´s connected between some pin and GND
  pinMode(BUTTON_UP_PIN, INPUT_PULLUP); // up button
  pinMode(BUTTON_SELECT_PIN, INPUT_PULLUP); // select button
  pinMode(BUTTON_DOWN_PIN, INPUT_PULLUP); // down button

  drawDisplay();

}


void loop() {
  // put your main code here, to run repeatedly:
  delay(1000); // this speeds up the simulation
}

int aligncenter_H(String text) {
  int newposy = (SCREEN_HEIGHT / 2) + ((u8g2.getAscent() - u8g2.getDescent()) / 2) - 1 ;
  return newposy;
}

int aligncenter(int posx, String text) {
  int newposx = posx - (u8g2.getUTF8Width(text.c_str()) / 2);
  return newposx;
}

int alignright(int posx, String text) {
  int newposx = posx - u8g2.getUTF8Width(text.c_str());
  return newposx;
}

void drawFramedText(int x, int y, String text) {
  int space = 3;
  int text_w;
  if ( text == "zur\374ck" ) {
    text_w = u8g2.getUTF8Width("zuruck");
  } else {
    text_w = u8g2.getUTF8Width(text.c_str());
  }
  int text_h = u8g2.getAscent() - u8g2.getDescent();
  /*
      https://github.com/olikraus/u8g2/wiki/u8g2reference#drawFrame
        u8g2.drawFrame(u8g2_uint_t x, u8g2_uint_t y, u8g2_uint_t w, u8g2_uint_t h)
          x: X-position of upper left edge.
          y: Y-position of upper left edge.
          w: Width of the box.
          h: Height of the box.
  */
  
    Serial.print("Text: ");
    Serial.println(text);

    Serial.print("space: ");
    Serial.print(space);
    Serial.print(", text_w: ");
    Serial.print(text_w);
    Serial.print(", text_h: ");
    Serial.print(text_h);
    Serial.print(", getAscent(): ");
    Serial.print(u8g2.getAscent());
    Serial.print(", getDescent(): ");
    Serial.println(u8g2.getDescent());
  
  // ***********************************************************************
  // * DRAW FRAME
  // ***********************************************************************
  int frame_x = x - ( space + 1 );                              // OK
  int frame_y = y - u8g2.getAscent() - ( space + 1 ) ;          // OK
  int frame_width  = text_w + ( 2 * space ) + 2;                // OK
  int frame_height = text_h + ( 2 * space ) + 1;                // OK
  u8g2.drawFrame(frame_x, frame_y, frame_width, frame_height);
  
    Serial.print("Frame: X: ");
    Serial.print(frame_x);
    Serial.print(", Y: ");
    Serial.print(frame_y);
    Serial.print(", width: ");
    Serial.print(frame_width);
    Serial.print(", height: ");
    Serial.println(frame_height);
  
  // ***********************************************************************
  // * DRAW STRING
  // ***********************************************************************
  int text_x = x;
  int text_y = y;
  u8g2.drawStr(text_x, text_y, text.c_str());
  
    Serial.print("Text:  X: ");
    Serial.print(text_x);
    Serial.print(", Y: ");
    Serial.print(text_y);
    Serial.print(", width: ");
    Serial.print(text_w);
    Serial.print(", height: ");
    Serial.println(text_h);
  
}

void drawFramedTextSelected(int x, int y, String text) {
  int space = 1;
  int text_w;
  if ( text == "zur\374ck" ) {
    text_w = u8g2.getUTF8Width("zuruck");
  } else {
    text_w = u8g2.getUTF8Width(text.c_str());
  }
  int text_h = u8g2.getAscent() - u8g2.getDescent();
  // ***********************************************************************
  // * DRAW FRAME
  // ***********************************************************************
  int frame_x = x - ( space + 1 );                              // OK
  int frame_y = y - u8g2.getAscent() - ( space + 1 ) ;          // OK
  int frame_width  = text_w + ( 2 * space ) + 2;                // OK
  int frame_height = text_h + ( 2 * space ) + 1;                // OK
  u8g2.drawBox(frame_x, frame_y, frame_width, frame_height);

  // ***********************************************************************
  // * DRAW STRING
  // ***********************************************************************
  int text_x = x;
  int text_y = y;
  u8g2.setDrawColor(0);
  u8g2.drawStr(text_x, text_y, text.c_str());
  u8g2.setDrawColor(1);

}

void drawSelectedTextLine(int y, String text, int space) {
  int text_w;
  if ( text == "zur\374ck" ) {
    text_w = u8g2.getUTF8Width("zuruck");
  } else {
    text_w = u8g2.getUTF8Width(text.c_str());
  }
  int text_h = u8g2.getAscent() - u8g2.getDescent();

  // ***********************************************************************
  // * DRAW FRAME
  // ***********************************************************************
  //int space = 3;
  int radius = 3;
  int frame_x = 0;
  int frame_y = y - u8g2.getAscent() - ( space + 1 ) ;          // OK
  int frame_width  = USABLE_SCREEN_WIDTH;
  int frame_height = text_h + ( 2 * space ) + 1;                // OK
  u8g2.drawRFrame(frame_x, frame_y, frame_width, frame_height, radius);

  // ***********************************************************************
  // * DRAW STRING
  // ***********************************************************************
  int text_x = frame_x + space + 1;
  int text_y = y;
  u8g2.drawStr(text_x, text_y, text.c_str());

}


void drawScrollbar(int pos, int max_pos) {
  int pixel_size = 1;
  int bar_width  = ( 2 * pixel_size ) + pixel_size;
  int bar_height = SCREEN_HEIGHT / max_pos;
  for (int i = 1; i < SCREEN_HEIGHT; i++) {
    u8g2.drawBox(SCREEN_WIDTH - (2 * pixel_size), i, pixel_size, pixel_size);
    i = i + pixel_size + 1;
  }
  u8g2.drawBox(SCREEN_WIDTH - bar_width, bar_height * pos, bar_width, bar_height);
  USABLE_SCREEN_WIDTH = SCREEN_WIDTH - bar_width - 1;
}


// display a string on multiple text lines, keeping words intact where possible,
// and accepting \n to force a new line
void drawWords(int xloc, int yloc /*bottom*/, const char *msg ) {
  int dspwidth = u8g2.getDisplayWidth(); // display width in pixels
  int strwidth = 0;  // string width in pixels
  char glyph[2]; glyph[1] = 0;
  for (const char *ptr = msg, *lastblank = NULL; *ptr; ++ptr) {
    while (xloc == 0 && (*msg == ' ' || *msg == '\n'))
      if (ptr == msg++) ++ptr; // skip blanks and newlines at the left edge
    glyph[0] = *ptr;
    strwidth += u8g2.getStrWidth(glyph); // accumulate the pixel width
    if (*ptr == ' ')  lastblank = ptr; // remember where the last blank was
    else ++strwidth; // non-blanks will be separated by one additional pixel
    if (*ptr == '\n' ||   // if we found a newline character,
        xloc + strwidth > dspwidth) { // or if we ran past the right edge of the display
      int starting_xloc = xloc;
      // print to just before the last blank, or to just before where we got to
      while (msg < (lastblank ? lastblank : ptr)) {
        glyph[0] = *msg++;
        xloc += u8g2.drawStr(xloc, yloc, glyph);
      }
      strwidth -= xloc - starting_xloc; // account for what we printed
      yloc += u8g2.getMaxCharHeight(); // advance to the next line
      xloc = 0; lastblank = NULL;
    }
  }
  while (*msg) { // print any characters left over
    glyph[0] = *msg++;
    xloc += u8g2.drawStr(xloc, yloc, glyph);
  }
}



void drawDisplay() {
  String tmptxt;

/*
  u8g2.clearBuffer();

  //u8g2.drawHLine(0, SCREEN_HEIGHT / 2, USABLE_SCREEN_WIDTH);
  //u8g2.drawFrame(0, 0, USABLE_SCREEN_WIDTH, SCREEN_HEIGHT);

  drawScrollbar(2, 6);
  u8g2.setFont(u8g2_font_7x14_tf);
  int mid_screen_pos = (SCREEN_HEIGHT/2)+(u8g2.getAscent()/2);
  int mid_menu_pos = ((SCREEN_HEIGHT-12)/2)+(u8g2.getAscent()/2)+12;

  tmptxt = "3 Menueintr\344ge";
  u8g2.drawStr(aligncenter(USABLE_SCREEN_WIDTH/2, tmptxt), 10, tmptxt.c_str());

  u8g2.setFont(u8g2_font_6x13_tf);
  tmptxt = "Menu 1 y";
  u8g2.drawStr(4, mid_menu_pos-17, tmptxt.c_str());

  u8g2.setFont(u8g2_font_7x14_tf);
  tmptxt = "Menu 2 j";
  //u8g2.drawStr(0, 40, tmptxt.c_str());
  drawSelectedTextLine(mid_menu_pos, tmptxt, 3);

  u8g2.setFont(u8g2_font_6x13_tf);
  tmptxt = "Menu 3 g";
  u8g2.drawStr(4, mid_menu_pos+17, tmptxt.c_str());
  
  u8g2.sendBuffer();
*/
/*
  u8g2.clearBuffer();

  //u8g2.drawHLine(0, SCREEN_HEIGHT / 2, USABLE_SCREEN_WIDTH);
  //u8g2.drawFrame(0, 0, USABLE_SCREEN_WIDTH, SCREEN_HEIGHT);

  drawScrollbar(2, 6);
  u8g2.setFont(u8g2_font_7x14_tf);
  int mid_screen_pos = (SCREEN_HEIGHT/2)+(u8g2.getAscent()/2);
  int mid_menu_pos = ((SCREEN_HEIGHT-12)/2)+(u8g2.getAscent()/2)+12;
  u8g2.drawHLine(0, 11, USABLE_SCREEN_WIDTH);

  tmptxt = "5 Menueintr\344ge";
  u8g2.drawStr(aligncenter(USABLE_SCREEN_WIDTH/2, tmptxt), 10, tmptxt.c_str());

  u8g2.setFont(u8g2_font_5x8_tf);
  tmptxt = "Menu 1 y";
  u8g2.drawStr(5, mid_menu_pos-24, tmptxt.c_str());

  u8g2.setFont(u8g2_font_6x10_tf);
  tmptxt = "Menu 2 y";
  u8g2.drawStr(4, mid_menu_pos-15, tmptxt.c_str());

  u8g2.setFont(u8g2_font_7x14_tf);
  tmptxt = "Menu 3 j";
  drawSelectedTextLine(mid_menu_pos, tmptxt, 2);

  u8g2.setFont(u8g2_font_6x10_tf);
  tmptxt = "Menu 3 g";
  u8g2.drawStr(4, mid_menu_pos+12, tmptxt.c_str());

  u8g2.setFont(u8g2_font_5x8_tf);
  tmptxt = "Menu 4 g";
  u8g2.drawStr(5, mid_menu_pos+20, tmptxt.c_str());

  u8g2.sendBuffer();
*/
/*
  u8g2.clearBuffer();
  
  tmptxt = "Cocktailname";
  u8g2.setFont(u8g2_font_tpss_tn);
  u8g2.drawStr(aligncenter(USABLE_SCREEN_WIDTH/2, tmptxt), 10, tmptxt.c_str());

  tmptxt = "Pumpe: ";
  u8g2.setFont(u8g2_font_7x14_tf);
  //drawFramedText(4,30, tmptxt);
  //drawFramedTextSelected(4,30, tmptxt);
  u8g2.drawStr(4, 30, tmptxt.c_str());
  
  int zahl = 9;
  u8g2.setFont(u8g2_font_7x14B_tf);
  //drawFramedText(alignright(74, String(zahl)), 30, String(zahl));
  //drawFramedTextSelected(alignright(74, String(zahl)), 30, String(zahl));
  u8g2.drawStr(alignright(74, String(zahl)), 30, String(zahl).c_str());

  tmptxt = "alkoholisch";
  u8g2.setFont(u8g2_font_5x8_tf);
  u8g2.drawStr(4, 42, tmptxt.c_str());

  tmptxt = "zur\374ck";
  u8g2.setFont(u8g2_font_6x10_tf);
  drawFramedText(alignright(SCREEN_WIDTH-4, "zuruck"), SCREEN_HEIGHT-5, tmptxt );
  //drawFramedTextSelected(alignright(SCREEN_WIDTH-4, "zuruck"), SCREEN_HEIGHT-5, tmptxt );
  //u8g2.drawStr(alignright(SCREEN_WIDTH-4, "zuruck"), SCREEN_HEIGHT-5, tmptxt.c_str());

  u8g2.sendBuffer();
*/
/*
  u8g2.clearBuffer();

  tmptxt = "Cocktailname";
  u8g2.setFont(u8g2_font_6x13_tf);
  u8g2.drawStr(aligncenter(SCREEN_WIDTH/2, tmptxt), 10, tmptxt.c_str());

  tmptxt = "wird zubereitet.";
  u8g2.setFont(u8g2_font_6x13_tf);
  u8g2.drawStr(aligncenter(SCREEN_WIDTH/2, tmptxt), 25, tmptxt.c_str());

  //u8g2.drawVLine(SCREEN_WIDTH / 2, 0, SCREEN_HEIGHT);

  tmptxt = "/"; 
  u8g2.setFont(u8g2_font_6x10_tf);
  u8g2.drawStr(aligncenter((SCREEN_WIDTH/2)-6, tmptxt), 37, tmptxt.c_str());
  tmptxt = "XXXml";
  u8g2.setFont(u8g2_font_6x10_tf);
  u8g2.drawStr(alignright((SCREEN_WIDTH/2)+(5*6), tmptxt), 37, tmptxt.c_str());
  tmptxt = "Zutat XYZ";
  u8g2.setFont(u8g2_font_6x10_tf);
  u8g2.drawStr(aligncenter(SCREEN_WIDTH/2, tmptxt), 47, tmptxt.c_str());

  tmptxt = "Bitte warten...";
  u8g2.setFont(u8g2_font_6x13_tf);
  u8g2.drawStr(0, SCREEN_HEIGHT, tmptxt.c_str());
  
  u8g2.sendBuffer();

  for ( int i=0; i<150; i++) {
    tmptxt = String(i);
    u8g2.setFont(u8g2_font_6x10_tf);
    u8g2.drawStr(alignright((SCREEN_WIDTH/2)-(2*6), tmptxt), 37, tmptxt.c_str());
    u8g2.sendBuffer();
    delay(100);
  }
*/
/*
  u8g2.clearBuffer();

  tmptxt = "Waage";
  u8g2.setFont(u8g2_font_6x13_tf);
  u8g2.drawStr(aligncenter(SCREEN_WIDTH/2, tmptxt), 10, tmptxt.c_str());

  tmptxt = String(1234) + "gr";
  u8g2.setFont(u8g2_font_6x13_tf);
  u8g2.drawStr(aligncenter(SCREEN_WIDTH/2, tmptxt), aligncenter_H(tmptxt), tmptxt.c_str());

  tmptxt = "zur\374ck";
  u8g2.setFont(u8g2_font_6x13_tf);
  drawFramedText(alignright(SCREEN_WIDTH-4, "zuruck"), SCREEN_HEIGHT-5, tmptxt );

  u8g2.sendBuffer();
*/
/*
  int _resume = 0;
  bool pos = false;
  while (_resume < 16) {
    u8g2.clearBuffer();

    tmptxt = "Waage";
    u8g2.setFont(u8g2_font_6x13_tf);
    u8g2.drawStr(aligncenter(SCREEN_WIDTH/2, tmptxt), 10, tmptxt.c_str());

    tmptxt = "Waage nullen?";
    u8g2.setFont(u8g2_font_6x13_tf);
    u8g2.drawStr(aligncenter(SCREEN_WIDTH/2, "Waage nullen?"), aligncenter_H("Waage nullen?"), tmptxt.c_str());

    u8g2.setFont(u8g2_font_6x13_tf);
    if (pos) {
      tmptxt = "Ja";
      drawFramedText(4, SCREEN_HEIGHT-5, tmptxt );
      tmptxt = "Nein";
      u8g2.drawStr(alignright(SCREEN_WIDTH-4, tmptxt), SCREEN_HEIGHT-5, tmptxt.c_str());
    } else {
      tmptxt = "Ja";
      u8g2.drawStr(4, SCREEN_HEIGHT-5, tmptxt.c_str());
      tmptxt = "Nein";
      drawFramedText(alignright(SCREEN_WIDTH-4, tmptxt), SCREEN_HEIGHT-5, tmptxt );
    }
    u8g2.sendBuffer();
    _resume++;
    pos = !pos;
    delay(150);
  }
  u8g2.clearBuffer();

  tmptxt = "Waage";
  u8g2.setFont(u8g2_font_6x13_tf);
  u8g2.drawStr(aligncenter(SCREEN_WIDTH/2, tmptxt), 10, tmptxt.c_str());

  tmptxt = "Waage nullen!";
  u8g2.setFont(u8g2_font_6x13_tf);
  u8g2.drawStr(aligncenter(SCREEN_WIDTH/2, tmptxt), aligncenter_H(tmptxt), tmptxt.c_str());

  tmptxt = "bitte warten...";
  u8g2.setFont(u8g2_font_6x13_tf);
  u8g2.drawStr(4, SCREEN_HEIGHT-5 , tmptxt.c_str());
  u8g2.sendBuffer();

  u8g2.sendBuffer();
  delay(1000);

  u8g2.clearBuffer();

  tmptxt = "Waage";
  u8g2.setFont(u8g2_font_6x13_tf);
  u8g2.drawStr(aligncenter(SCREEN_WIDTH/2, tmptxt), 10, tmptxt.c_str());

  tmptxt = "Waage genullt.";
  u8g2.setFont(u8g2_font_6x13_tf);
  u8g2.drawStr(aligncenter(SCREEN_WIDTH/2, tmptxt), aligncenter_H(tmptxt), tmptxt.c_str());

  u8g2.sendBuffer();
*/


  u8g2.clearBuffer();

  tmptxt = "Waage kalibrieren";
  u8g2.setFont(u8g2_font_6x13_tf);
  u8g2.drawStr(aligncenter(SCREEN_WIDTH/2, tmptxt), 10, tmptxt.c_str());

//  drawWords(0, 20, "Remove any load applied to the load cell.");
//  drawWords(0, 20, "Bitte alle Gewichte von der Waage entfernen.");
  u8g2.setFont(u8g2_font_6x10_tf);
  u8g2.drawStr(0, 22,       "Bitte alle Gewichte");
  u8g2.drawStr(0, 22+10,    "von der Waage");
  u8g2.drawStr(0, 22+10+10, "entfernen.");


  tmptxt = "Ja";
  drawFramedText(4, SCREEN_HEIGHT-5, tmptxt );
  tmptxt = "Nein";
  drawFramedText(alignright(SCREEN_WIDTH-4, tmptxt), SCREEN_HEIGHT-5, tmptxt );

  u8g2.sendBuffer();
  
  


  /*
    u8g2.clearBuffer();  // clear buffer for storing display content in RAM
    String text;
    int posx;
    int posy;
    int font_h;
    int text_w;
  */
  /*
      https://github.com/olikraus/u8g2/wiki/u8g2reference#drawRFrame
        u8g2.drawRFrame(u8g2_uint_t x, u8g2_uint_t y, u8g2_uint_t w, u8g2_uint_t h, u8g2_uint_t r)
          x: X-position of upper left edge.
          y: Y-position of upper left edge.
          w: Width of the box.
          h: Height of the box.
          r: Radius for the four edges.
  */
  //u8g2.drawRFrame( 0, 24, 124, 16, 5);
  /*
    drawScrollbar(2, 4);

    u8g2.sendBuffer(); // send buffer from RAM to display controller

    //u8g2.drawLine(u8g2_uint_t x0, u8g2_uint_t y0, u8g2_uint_t x1, u8g2_uint_t y1)
    //u8g2.drawLine(0, 0, USABLE_SCREEN_WIDTH, 0);

    //u8g2.drawLine(0, SCREEN_HEIGHT/2, USABLE_SCREEN_WIDTH, SCREEN_HEIGHT/2);
    u8g2.drawHLine(0, SCREEN_HEIGHT / 2, USABLE_SCREEN_WIDTH);

    //u8g2.drawLine(USABLE_SCREEN_WIDTH/2, 0, USABLE_SCREEN_WIDTH/2, SCREEN_HEIGHT);
    u8g2.drawVLine(USABLE_SCREEN_WIDTH / 2, 0, SCREEN_HEIGHT);

    // selected item background
    //u8g2.drawXBMP(0, 22, 128, 21, bitmap_item_sel_outline);

    u8g2.setFont(u8g2_font_6x13_tf);
    text = "AbcD";
    //drawFramedText(text, 4, 13);

    u8g2.setFont(u8g2_font_6x13_tf);
    text = "Wxyz";
    //drawFramedTextSelected(text, 65, 13);

    u8g2.setFont(u8g2_font_6x13_tf);
    text = "Zentriert";
    font_h = u8g2.getAscent() - u8g2.getDescent();
    //drawFramedText(text, aligncenter(text, USABLE_SCREEN_WIDTH / 2), (SCREEN_HEIGHT / 2) + (font_h / 2) - 1 );

    u8g2.setFont(u8g2_font_5x8_tf);
    text = "rechts unten";
    //int space = 1;
    //drawFramedText(text, alignright(text, USABLE_SCREEN_WIDTH - (space + 1)), SCREEN_HEIGHT - (space + 1) );

    u8g2.setFont(u8g2_font_7x14_tf);
    text = "AbcD";
    //drawFramedText(text, 31, 14);

    u8g2.setFont(u8g2_font_7x14B_tf);
    text = "Wxyz";
    //drawFramedTextSelected(text, 94, 14);

    u8g2.setFont(u8g2_font_7x14_tf);
    text = "AbcDwXyZ";
    //drawFramedText(text, 4, 14);

    u8g2.setFont(u8g2_font_7x14B_tf);
    text = "selected gyJj";
    int mid_screen_pos = (SCREEN_HEIGHT/2)+(u8g2.getAscent()/2);
    drawSelectedTextLine(text, mid_screen_pos );

    //u8g2.drawFrame(0, 0, USABLE_SCREEN_WIDTH, SCREEN_HEIGHT);
  */
  /*
    text_w = u8g2.getUTF8Width(text.c_str());
    posx = USABLE_SCREEN_WIDTH/2 - USABLE_SCREEN_WIDTH/4;
    posy = 11;
    Serial.print("Line 1 - ");
    Serial.print("POSX: ");
    Serial.print(posx);
    Serial.print(" - POSY: ");
    Serial.println(posy-font_h+1);
    drawHLine(0, USABLE_SCREEN_WIDTH, posy-font_h+1);
    Serial.print("Text 1 - ");
    Serial.print("POSX: ");
    Serial.print(posx);
    Serial.print(" - POSY: ");
    Serial.println(posy);
    u8g2.drawStr(aligncenter(text, posx), posy, text.c_str());

    text = "Efgy";
    posx = USABLE_SCREEN_WIDTH/2 + USABLE_SCREEN_WIDTH/4;
    Serial.print("Text 2 - ");
    Serial.print("POSX: ");
    Serial.print(posx);
    Serial.print(" - POSY: ");
    Serial.println(posy);
    u8g2.drawStr(aligncenter(text, posx), posy, text.c_str());

    //posy = posy + 2 + 1;
    posy = posy-u8g2.getDescent();

    Serial.print("Line 2 - ");
    Serial.print("POSX: ");
    Serial.print(posx);
    Serial.print(" - POSY: ");
    Serial.println(posy);
    drawHLine(0, USABLE_SCREEN_WIDTH, posy);

    text = String(u8g2.getAscent()) + " + " + String(u8g2.getDescent()) + " = " + String(font_h) + " | " + u8g2.getMaxCharHeight();
    text_w = u8g2.getUTF8Width(text.c_str());
    posx = USABLE_SCREEN_WIDTH/2;
    posy = SCREEN_HEIGHT-1;
    Serial.print("Text 2 - ");
    Serial.print("POSX: ");
    Serial.print(posx);
    Serial.print(" - POSY: ");
    Serial.println(posy);
    u8g2.drawStr(aligncenter(text, posx), posy, text.c_str());

    Serial.print("Line 3 - ");
    Serial.print("POSX: ");
    Serial.print(posx);
    Serial.print(" - POSY: ");
    Serial.println(posy);
    drawHLine(0, USABLE_SCREEN_WIDTH, posy);

  */
  /*

    // draw previous item as icon + label
    //u8g2.setFont(u8g2_font_7x14_tf);
    //u8g2.drawStr(25, 15, "previous item");
    //u8g2.drawXBMP( 4, 2, 16, 16, bitmap_icons[item_sel_previous]);

    // draw selected item as icon + label in bold font
    u8g2.setFont(u8g2_font_7x14B_tf);
    //u8g2.setFont(u8g2_font_tpss_tn);
    u8g2.drawStr(25, 15 + 20 + 2, "selected item");
    //u8g2.drawXBMP( 4, 24, 16, 16, bitmap_icons[item_selected]);

    // draw next item as icon + label
    //u8g2.setFont(u8g2_font_7x14_tf);
    u8g2.setFont(u8g2_font_4x6_tf);
    u8g2.drawStr(25, 15 + 20 + 20 + 2 + 2, "next item");
    //u8g2.drawXBMP( 4, 46, 16, 16, bitmap_icons[item_sel_next]);

    // draw scrollbar background
    u8g2.drawXBMP(128 - 8, 0, 8, 64, bitmap_scrollbar_background);

    // draw scrollbar handle
    u8g2.drawBox(125, 64 / NUM_ITEMS * item_selected, 3, 64 / NUM_ITEMS);
  */
  // draw upir logo
  //u8g2.drawXBMP(128-16-4, 64-4, 16, 4, upir_logo);
  /*
    u8g2.sendBuffer(); // send buffer from RAM to display controller
  */

}