#include <Adafruit_SSD1306.h>

Adafruit_SSD1306 display(4);

void setup() {
  
  
  
    display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
    display.clearDisplay();
    display.display();
// start writing 
display.clearDisplay();
display.setTextSize(3);
display.setTextColor(WHITE);
display.setCursor(15,30);
display.println("Hello World!");
 
display.display();
delay(1000);
// disply.write() can display single cahrectorcharacter 

display.clearDisplay();
display.setTextColor(WHITE);
display.setCursor(35,30);

display.write(72);
display.write(101);
display.write(108);
display.write(108);
display.write(111);
display.write(32);
display.write(87);
display.write(111);
display.write(114);
display.write(108);
display.write(100);
display.write(33);

display.display();

display.clearDisplay();

// Sets the color to black with a white background
display.setTextColor(BLACK, WHITE);
display.setCursor(25,30);
display.println("Inverted text!");
 
display.display();


display.clearDisplay();


display.setTextColor(WHITE);
display.setCursor(0,0);
display.setTextSize(1);
display.print("A");
display.setTextSize(2);
display.print("A");
display.setTextSize(3);
display.print("A");
display.setTextSize(4);
display.print("A");
display.setTextSize(5);
display.print("A");
display.setTextSize(6);
display.print("A");
 
display.display();


// draw line
/*************************************
To draw a line you can call display.drawLine(startX, 
startY, endX, endY, color). For example following code
 draws a diagonal lines in the screen so that they
 shape a big X:
You can access the width and height of the display
 using display.width() and display.height() functions. 
 By doing so your code would be independent from the 
screen size.
Drawing rectangle

The function to draw a rectangle is
 display.drawRect(upperLeftX, upperLeftY, width, height, color). 
 Here is the code that draws three rectangle on some 
random places:

Drawing circle

The function is display.drawCircle(centerX, centerY, radius, color).
 Here is an example which draws a 
smiley-like shape:
************************************/
display.clearDisplay();

display.drawLine(0,0,display.width() - 1, display.height() - 1, WHITE);
display.drawLine(display.width() - 1,0,0, display.height() - 1, WHITE);

display.display();
delay(1000);

display.clearDisplay();

display.drawRect(100, 10, 20, 20, WHITE);
display.fillRect(10, 10, 45, 15, WHITE);
display.drawRoundRect(60, 20, 35, 35, 8, WHITE);

display.display();
display.clearDisplay();

delay(1000);
display.drawCircle(60, 30, 30, WHITE);
display.fillCircle(50, 20, 5, WHITE);
display.fillCircle(70, 20, 5, WHITE);

display.display();
delay(1000);

display.drawPixel(20, 35, WHITE);
display.drawPixel(45, 12, WHITE);
display.drawPixel(120, 59, WHITE);
display.drawPixel(97, 20, WHITE);
display.drawPixel(35, 36, WHITE);
display.drawPixel(72, 19, WHITE);
display.drawPixel(90, 7, WHITE);
display.drawPixel(11, 29, WHITE);
display.drawPixel(57, 42, WHITE);
display.drawPixel(69, 34,  WHITE);
display.drawPixel(108, 12, WHITE);

}


void loop() {
}