Positive scroll text on large dot matrix display (max7219)

Posiscale.ino

//MAX7219
#include <SPI.h>
#include <Adafruit_GFX.h>
#include <Max72xxPanel.h>
#define stringArraySize 7
//int pinBatt = A0;
int pinCS = 8; // Attach CS to this pin, DIN to MOSI and CLK to SCK (cf http://arduino.cc/en/Reference/SPI )
int numberOfHorizontalDisplays = 4;
int numberOfVerticalDisplays = 1;

Max72xxPanel matrix = Max72xxPanel(pinCS, numberOfHorizontalDisplays, numberOfVerticalDisplays);

String results[stringArraySize] = { "Nice!", "Sweet!", "Lovely!", "Cute!", "Hot!", "Cool!", "Good!" };

long randNumber;
long randoSeed;

int wait = 100; // In milliseconds

int spacer = 1;
int width = 5 + spacer; // The font width is 5 pixels

void setup() {

  Serial.begin(9600);

    
  matrix.setIntensity(7); // Use a value between 0 and 15 for brightness

// Adjust to your own needs
//  matrix.setPosition(0, 0, 0); // The first display is at <0, 0>
//  matrix.setPosition(1, 1, 0); // The second display is at <1, 0>
//  matrix.setPosition(2, 2, 0); // The third display is at <2, 0>
//  matrix.setPosition(3, 3, 0); // And the last display is at <3, 0>
//  ...
  matrix.setRotation(0, 1);    // The first display is position upside down
  matrix.setRotation(1, 1);    // The first display is position upside down
  matrix.setRotation(2, 1);    // The first display is position upside down
  matrix.setRotation(3, 1);    // The same hold for the last display


  matrix.fillScreen(LOW);
  matrix.setCursor(2,1);
    matrix.print("READY");
    matrix.write(); // Send bitmap to display
    delay(1500);
  matrix.fillScreen(LOW);
    matrix.write(); // Send bitmap to display

  /*while(true){
  matrix.fillScreen(LOW);
    matrix.write(); // Send bitmap to display
    matrix.setCursor(2,1);
    matrix.print(analogRead(A1)*256);
    matrix.write(); // Send bitmap to display
    delay(100);
  
  }*/

  for(int i=0;i<numberOfHorizontalDisplays*8-1;i++) {
    matrix.drawPixel(i,3,true);
    matrix.write(); // Send bitmap to display
    randoSeed+=analogRead(A1);
    delay(25);
  }

  for(int i=0;i<numberOfHorizontalDisplays*8-1;i++) {
    matrix.drawPixel(i,3,false);
    matrix.write(); // Send bitmap to display
    randoSeed+=analogRead(A1);
    delay(25);
  }


  delay(500);

  randomSeed(randoSeed*512);
  randNumber = random(stringArraySize);
  Serial.print("Seed: "); Serial.println(randoSeed); 
  Serial.print("Generated Number: "); Serial.println(randNumber);



}

void loop() {

  scrollText(results[randNumber]);


/*
    matrix.fillScreen(LOW);
    matrix.setCursor(2,1);
    matrix.print("hello");
    matrix.write(); // Send bitmap to display
    delay(500);
    matrix.fillScreen(LOW);
    matrix.setCursor(1,1);
    matrix.print("WORLD");
    matrix.write(); // Send bitmap to display
    delay(500);
    counter++;
*/
  



}


void scrollText(String str){

  for ( int i = 0 ; i < width * str.length() + matrix.width() - 1 - spacer; i++ ) {

    matrix.fillScreen(LOW);

    int letter = i / width;
    int x = (matrix.width() - 1) - i % width;
    int y = (matrix.height() - 8) / 2; // center the text vertically

    while ( x + width - spacer >= 0 && letter >= 0 ) {
      if ( letter < str.length() ) {
        matrix.drawChar(x, y, str[letter], HIGH, LOW, 1);
      }

      letter--;
      x -= width;
    }

    matrix.write(); // Send bitmap to display

    delay(wait);
  }

}