#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

// OLED FeatherWing buttons map to different pins depending on board.
// The I2C (Wire) bus may also be different.


// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
#define OLED_RESET     4 // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(128, 64, &Wire, OLED_RESET);
#define C_X 63
#define C_Y 31
void setup() {
  

  display.begin(SSD1306_SWITCHCAPVCC, 0x3c); // Address 0x3C for 128x32
  display.display();
  delay(1000);
  

  /*delay(1000);

  // Clear the buffer.
  display.clearDisplay();

  // text display tests
  
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0,0);
  display.print("Connecting to SSID\n'adafruit':");
  display.print("connected!");
  display.println("IP: 10.0.1.23");
  display.println("Sending val #0");
  display.setCursor(0,0);
  display.display(); // actually display all of the above*/
  display.clearDisplay();
  display.drawCircle(C_X,C_Y,31,SSD1306_WHITE);
   display.display();
}
float a=45;
float theta_r,x,y;
int i=360;
void loop(){
  //display.clearDisplay();
  display.drawCircle(C_X,C_Y,31,SSD1306_WHITE);
  theta_r=i*(PI/180.0);
  x=C_X+25*cos(theta_r);
  y=C_Y-25*sin(theta_r);
  
  display.drawLine(C_X,C_Y,x,y,SSD1306_WHITE);
  display.display();
  delay(100);
  display.drawLine(C_X,C_Y,x,y,SSD1306_BLACK);
  display.display();
  if (i>6)
     i-=6;
  else 
     i=360;
}