#include <Arduino.h>
#include <U8g2lib.h>

#ifdef U8X8_HAVE_HW_SPI
#include <SPI.h>
#endif
#ifdef U8X8_HAVE_HW_I2C
#include <Wire.h>
#endif


U8G2_SSD1306_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);
// End of constructor list

// this is one way how to define images for u8g library
const uint8_t upir_logo[] U8X8_PROGMEM = {
B10000100, B11011110,     //  ░░░█░█░███░█░███
B11001101, B00001001,     //  ░░░█░█░█░█░░░█░█
B10100101, B00001000,     //  ░░░█░█░██░░█░██░
B10000100, B11001000      //  ░░░██░░█░░░█░█░█
};

//#define PI 3.1416

const uint8_t img_bubble_tip[] U8X8_PROGMEM = {
B01111100,     //░█████░░
B00111000,     //░░███░░░
B00010000      //░░░█░░░░
};


void setup() {
  Serial.begin(115200);
  u8g2.begin();
  u8g2.setColorIndex(1); // white color
  //u8g2.setRot180();  // screen rotation by 180°, was better for positioning the display next to knob, but slower in performance
  Serial.println("Setup Ok!");
  Serial.print("PI:");
  Serial.println(PI);
  u8g2.clearBuffer();
  draw(u8g2);
  u8g2.sendBuffer();
}

float seno(int angulo)
{
   return sin(angulo * PI / 180);
}
float coseno(int angulo)
{
   return cos(angulo * PI / 180);
}
void gauge(uint8_t x, uint8_t y, uint8_t r) {
    for(int i=40;i<330; i+=10)
    {
      int x0=x+(r*seno(i));
      int y0=y+(r*coseno(i));
      if(i%20)u8g2.drawPixel(x0, y0);
      int x1=x+((r+8)*seno(i));
      int y1=y+((r+8)*coseno(i));
      u8g2.drawPixel(x1, y1);      
    }
}

void gaugeV(uint8_t x, uint8_t y, uint8_t r, int v) {
    int x2=0,y2=0,x3=0,y3=0;
    bool p=false;
    for(int i=40;i<330; i+=2)
    {
      int x0=x+(r*seno(i));
      int y0=y+(r*coseno(i));
      //if(i%20)u8g2.drawPixel(x0, y0);
      int x1=x+((r+8)*seno(i));
      int y1=y+((r+8)*coseno(i));
      if(p && ((v>0 && i<v) ||(v<0 && i>-v)))
      {
        u8g2.drawTriangle(x0,y0,x1,y1,x2,y2);
        u8g2.drawTriangle(x2,y2,x3,y3,x1,y1);
      }
      p=true;
      x2=x0;y2=y0;x3=x1;y3=y1;
    }
    u8g2.setFont(u8g2_font_unifont_t_symbols);
    char cstr[16];
    itoa(-v, cstr, 10);
    u8g2.drawUTF8(x-(u8g2.getStrWidth(cstr)/2), y+5, cstr);
}
void draw(U8G2 u8g2) {
    u8g2.setDrawColor(1);
    gauge(28,35,18);
    u8g2.sendBuffer();
    gauge(99,35,18);
    u8g2.sendBuffer();
    delay(4000);
    gaugeV(28,35,18,-90);
    u8g2.sendBuffer();
    delay(4000);
    gaugeV(99,35,18,-120);
    u8g2.sendBuffer();
    //u8g2.drawCircle(30, 34, 28, U8G2_DRAW_ALL);
    //u8g2.drawCircle(30, 34, 18, U8G2_DRAW_ALL);
    //u8g2.drawCircle(98, 34, 28, U8G2_DRAW_ALL);
    //u8g2.drawCircle(98, 34, 18, U8G2_DRAW_ALL);
}

void loop(void) {
  // picture loop  
 
  
}