#include <Adafruit_NeoPixel.h>



//https://adafruit.github.io/Adafruit_NeoPixel/html/class_adafruit___neo_pixel.html#ab932cb619cd3420f9e3f269b7401710e

/**

  Written by Hamid Attarzadeh
  https://freelivenet.com

*/


#define PIN 2  //Output pin

#define POTENTIOMETER_PIN A0

#define MAX_LED 128  //Quantity of LED

uint32_t ledColor;

int ledPos;

Adafruit_NeoPixel strip = Adafruit_NeoPixel(MAX_LED, PIN, NEO_RGB + NEO_KHZ800);

/*

       0   1   2   3   4   5   6   7
  --------------------------------
  0 |  0   1   2   3   4   5   6   7
  1 |  15  14  13  12  11  10  9   8
  2 |  16  17  18  19  20  21  22  23
  3 |  31  30  29  28  27  26  25  24
  4 |  32  33  34  35  36  37  38  39
  5 |  47  46  45  44  43  42  41  40
  6 |  48  49  50  51  52  53  54  55
  7 |  63  62  61  60  59  58  57  56

*/

int xy2pos(int x, int y) {
  if (y % 2 == 0) {
    return (y * 8 + x);
  } else {
    return (y * 8 + (7 - x));
  }
}

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);

  Serial.println("0x0 = " + String(xy2pos(0, 0)));
  Serial.println("0x1 = " + String(xy2pos(0, 1)));

  Serial.println("1x1 = " + String(xy2pos(1, 1)));
  Serial.println("1x2 = " + String(xy2pos(1, 2)));

  Serial.println("3x3 = " + String(xy2pos(3, 3)));
  Serial.println("4x3 = " + String(xy2pos(4, 3)));

  drawline(1, 1, 1, 4);
  strip.show();

  drawRectangle(1, 1, 4, 1);
  strip.show();

  ledColor = strip.color(100, 200, 250, 20);

}

void loop() {
  // put your main code here, to run repeatedly:

}

void drawline(int x1, int y1, int x2, int y2) {
  Serial.println("Line from " + String(x1) + "x" + String(y1) + " to " + String(x2) + "x" + String(y2));
  for (int x = x1; x <= x2; x++) {
    for (int y = y1; y <= y2; y++) {
      ledPos = xy2pos(x, y);
      strip.setColor(ledPos, ledColor);
      Serial.print(String(xy2pos(x, y)) + " , ");
      // Serial.println(String(x) + "x" + String(y) + " = " + String(xy2pos(x, y)) + " , ");
    }
  }
  Serial.print("");
  Serial.println("-----------------------------");
}


void drawRectangle(int x1, int y1, int x2, int y2) {
  drawline(x1, y1, x2, y1);
  drawline(x1, y1, x1, y2);
  drawline(x2, y1, x2, y2);
  drawline(x1, y2, x2, y2);
}