Wanting to scroll messages on a "display"

Other Hardware Displays
43

For what it is worth....

This is the FUNCTION I use to display the temperature on the display.

This is ONLY the bit of code which is called to display it.
So other things are set before/outside this code.

void new_display_temperature(float value, byte pos)
{
  //
  if (sub_debug == 1)
  {
    Serial.println("T1");
  }
  if (TimeShown == 1)     //  If set, wipe display
  {
    //
    //  Clear display of time shown.
    //
    wipe(15);
    TimeShown = 0;      //    Turn off flag.
  }
//  byte pos = 8;         //  Position on display where first digit is shown.    SHOULD BE EXTERNAL SET
  byte digit_counter = pos;       //    Sneaky, because if used for second digit, can't use the 8 as before.
  byte len;
  byte count = 0;
  
  char buffer[6];
  dtostrf(value, 2,0, buffer);    //    Alas no decimal accuracy.  :(   But if ever I can work out how to get it.....

  if (value_debug == 1)
  {
    Serial.print("1-> ");
    Serial.println(buffer);
    Serial.print("2-> ");
  }
  
  sprintf(message, "%s", buffer);
  if (value_debug == 1)
  {
    Serial.println(message);
  }
  message_length = strlen(message);
  //
  len = format(message);        //  Change message format to required.
  //
  
  if (value_debug == 1)
  {
    //
    Serial.print("Message is -> ");
    Serial.println(message);
    Serial.print("Message length is ");
    Serial.println(len);
  }
  delay(2000);
  while (count < message_length)
  {
    MAX7219senddata(   (pos-count)  ,   bmessage[count]    );
    count = count + 1;
    digit_counter = digit_counter - 1;
//    delay(400);
//    delay(10);
  }
  //
  byte j = 99;                  //  This is the degree symbol
  byte k = 13;                  //  This is the c symbol  Could be made to be capitol C rather than lower case.
                                //  For Capitol C = 78.
//  MAX7219senddata(9, 239);      //  Don't decode all digits  bits set = decode.  This has bit 5 set to 0.
  MAX7219senddata(9, 207);      //  Don't decode all digits  bits set = decode.  This has bit 5 and 4 set to 0.
  //
  //  pos - message_length = where the last thing was shown.
  MAX7219senddata((pos+1-message_length-1),j);
  MAX7219senddata((pos+1-message_length-2),k);
}

Ok, I am probably wrong.
And I haven't included the format() routine.

I get that this isn't going to be a walk in the park but with the code/s supplied by you both, I am seeing patterns that look close to what I want to do.

I'll post that shortly.