Adafruit Bicolor LED Square Pixel Matrix

/***************************************************
  This is a library for our I2C LED Backpacks

  Designed specifically to work with the Adafruit LED Matrix backpacks
  ----> http://www.adafruit.com/products/872
  ----> http://www.adafruit.com/products/871
  ----> http://www.adafruit.com/products/870

  These displays use I2C to communicate, 2 pins are required to
  interface. There are multiple selectable I2C addresses. For backpacks
  with 2 Address Select pins: 0x70, 0x71, 0x72 or 0x73. For backpacks
  with 3 Address Select pins: 0x70 thru 0x77

  Adafruit invests time and resources providing this open source code,
  please support Adafruit and open-source hardware by purchasing
  products from Adafruit!

  Written by Limor Fried/Ladyada for Adafruit Industries.
  BSD license, all text above must be included in any redistribution
 ****************************************************/

#include "adafruit-led-backpack.h"

Adafruit_BicolorMatrix matrix = Adafruit_BicolorMatrix();

void setup() {
  Serial.begin(9600);
  Serial.println("8x8 LED Matrix Test");

  matrix.begin(0x70);  // pass in the address
}

static const uint8_t
  smile_bmp[] =
  { B00111100,
    B01000010,
    B10100101,
    B10000001,
    B10100101,
    B10011001,
    B01000010,
    B00111100 },
  neutral_bmp[] =
  { B00111100,
    B01000010,
    B10100101,
    B10000001,
    B10111101,
    B10000001,
    B01000010,
    B00111100 },
  frown_bmp[] =
  { B00111100,
    B01000010,
    B10100101,
    B10000001,
    B10011001,
    B10100101,
    B01000010,
    B00111100 };

void loop() {

  matrix.clear();
  matrix.drawBitmap(0, 0, smile_bmp, 8, 8, LED_GREEN);
  matrix.writeDisplay();
  delay(500);

  matrix.clear();
  matrix.drawBitmap(0, 0, neutral_bmp, 8, 8, LED_YELLOW);
  matrix.writeDisplay();
  delay(500);

  matrix.clear();
  matrix.drawBitmap(0, 0, frown_bmp, 8, 8, LED_RED);
  matrix.writeDisplay();
  delay(500);

  matrix.clear();      // clear display
  matrix.drawPixel(0, 0, LED_GREEN);
  matrix.writeDisplay();  // write the changes we just made to the display
  delay(500);

  matrix.clear();
  matrix.drawLine(0,0, 7,7, LED_YELLOW);
  matrix.writeDisplay();  // write the changes we just made to the display
  delay(500);

  matrix.clear();
  matrix.drawRect(0,0, 8,8, LED_RED);
  matrix.fillRect(2,2, 4,4, LED_GREEN);
  matrix.writeDisplay();  // write the changes we just made to the display
  delay(500);

  matrix.clear();
  matrix.drawCircle(3,3, 3, LED_YELLOW);
  matrix.writeDisplay();  // write the changes we just made to the display
  delay(500);

  matrix.setTextWrap(false);  // we dont want text to wrap so it scrolls nicely
  matrix.setTextSize(1);
  matrix.setTextColor(LED_GREEN);
  for (int8_t x=7; x>=-36; x--) {
    matrix.clear();
    matrix.setCursor(x,0);
    matrix.print("Hello");
    matrix.writeDisplay();
    delay(100);
  }
  matrix.setRotation(3);
  matrix.setTextColor(LED_RED);
  for (int8_t x=7; x>=-36; x--) {
    matrix.clear();
    matrix.setCursor(x,0);
    matrix.print("World");
    matrix.writeDisplay();
    delay(100);
  }
  matrix.setRotation(0);
}