/* 
 |------------------------------------------------------------------|
 |                    Arduino project                               |
 |                                                                  |
 |         Scrolling Text on ADAFRUIT TFT Arduino Shield            |
 |                                                                  |
 |                                                                  |
 |                                                                  |
 |     sketch uses Adafruit libraries - for more information-       |
 | http://learn.adafruit.com/adafruit-gfx-graphics-library?view=all |
 |                                                                  |
 |                                                                  |
 |                                                                  |
 |           a Renfrew Arduino 2014 project - public domain         |
 |            (scroll routine thanks to Andrew Wendt)               |
 |__________________________________________________________________|
 
 */
// libraries 
#include "SPI.h" // SPI display 
#include "Adafruit_GFX.h" // Adafruit graphics 
#include "Adafruit_ILI9341.h" // ILI9341 screen controller
// pin definitions
#define TFT_DC 9
#define TFT_CS 10

Adafruit_ILI9341 tft=Adafruit_ILI9341(TFT_CS, TFT_DC); // hardware SPI

void setup()
{

  tft.begin();
  tft.fillScreen(ILI9341_CYAN);
  tft.fillScreen(ILI9341_BLUE);
  tft.fillScreen(ILI9341_CYAN);
  tft.setTextColor(ILI9341_WHITE, ILI9341_BLACK);  // White on black
  tft.setTextWrap(false);  // Don't wrap text to next line
  tft.setTextSize(5);  // large letters
  tft.setRotation(0); // horizontal display
}

void loop()
{
  String text = " . .  Text scrolling on Adafruit TFT shield . ."; // sample text
  const int width = 18;  // width of the marquee display (in characters)

  // Loop once through the string
  for (int offset = 0; offset < text.length(); offset++)
  {

    // Construct the string to display for this iteration
    String t = "";
    for (int i = 0; i < width; i++)
      t += text.charAt((offset + i) % text.length());
      
    // Print  the string for this iteration
    tft.setCursor(0, tft.height()/2-10);  // display will be halfway down screen
    tft.print(t);

    // Short delay so the text doesn't move too fast
    delay(200);
  }
}