arduino-mpduino/mpduino/layout.ino

/*
  Define one function to control all of the layout.
  It works per line with only one variable (tick).
  This one gives a way of scrolling through text.

*/
#define FLASH_LINE_TICKS 3

void initial_layout() {
  display.clearDisplay();
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(0, 8);
  display.println("Waiting..");
  display.display();
  
}

void layout( unsigned int tick ) {
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setTextWrap(false);
  
  if ( playing || tick % FLASH_LINE_TICKS ) {
    display.setCursor(0, 0);
    // First line (20)
    if (volume == 100 || volume == 0){
      if (volume == 100) display.print('00');
      else display.print('--');
    }
    else display.print(volume);
    display.print(F("% "));
    display.print(round(temperature));
    display.print(F("C "));
    display.print(round(humidity));
    display.print(F("% |"));
    if (repeat_bool) display.print('r');
    else display.print(' ');
    if (random_bool) display.print('x');
    else display.print(' ');
    if (single_bool) display.print('s');
    else display.print(' ');
    if (consume_bool) display.print('c');
    else display.print(' ');
    if (shuffle_bool) display.print('z');
    else display.print(' ');
    if (updating_bool) display.print('u');
    else display.print(' ');
  }
  
  //line 2
  display.setCursor(0, 8);
  display.print(textscroll(title,tick));
  display.startscrollleft(0x06, 0x0F);
  
  //line 3
  display.setCursor(0, 16);
  display.print(textscroll(artist, tick));
  
  //line 4
  display.setCursor(0, 24);
  display.print(textscroll(album, tick));
  
  display.display();
}


String textscroll(String text, unsigned int tick) {
    int chars = 21;
    int len = text.length();
    String newstring = "";
    
    if ( len < chars) {
      for ( int i = len; i < chars -1; i+=2){
        text = " "+text+" ";
      }
      if ( text.length() == chars - 1) text = text+" ";
      
      return text;
    }
    
    text = text + " - ";
    for ( int i = 0; i < chars; i++ )
      newstring += text.charAt((2*tick + i) % (len+3));
      
    return newstring;
}

int calcMaxTicks() {
     maxticks = title.length() * artist.length() * album.length();
     Serial.print("MT:");
     Serial.println(maxticks);
     return maxticks;
}