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matrix.fillRect(x1, y1, x2, y2, LED_ON);

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matrix.drawRect(x1, y1, x2, y2, LED_ON);
  

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matrix.drawLine(x1 ,y1 , x2, y2, LED_ON);

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// required libraries
#include <Wire.h>
#include "Adafruit_LEDBackpack.h"
#include "Adafruit_GFX.h"

// define matrix object
Adafruit_8x8matrix matrix = Adafruit_8x8matrix();

int z;

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matrix.writeDisplay(); 

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matrix.drawPixel(x, y, LED_ON); 

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static uint8_t PROGMEM
  crosshatch[] =
  { B10101010,
    B01010101,
    B10101010,
    B01010101,
    B10101010,
    B01010101,
    B10101010,
    B01010101 };

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matrix.clear(); // clear the display
matrix.drawBitmap(0, 0, crosshatch, 8, 8, LED_ON); // setup the image to display
matrix.writeDisplay(); // display the image
delay(1000);

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// required libraries
#include <Wire.h>
#include "Adafruit_LEDBackpack.h"
#include "Adafruit_GFX.h"

// define matrix object
Adafruit_8x8matrix matrix = Adafruit_8x8matrix();

void setup() 
{

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// required libraries
#include <Wire.h>
#include "Adafruit_LEDBackpack.h"
#include "Adafruit_GFX.h"

// define matrix object
Adafruit_8x8matrix matrix = Adafruit_8x8matrix();

void setup() 
{