#include <LedControl.h>  //引用 LedControl 程式庫
LedControl lc(12, 11, 10, 1); //宣告 LedControl 物件

bool go = true;
int X, Y;
int count = 0;
int a = 0, b = 0;
int Ma = 0, Mb = 0;
int dira = 0, dirb = 0;


void setup() {
  pinMode(2, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(2), my_ISR, FALLING);
  Serial.begin(9600);
  randomSeed(analogRead(A5));
  lc.shutdown(0, false); // 關閉省電模式
  lc.setIntensity(0, 0); // 設定亮度為 0 (介於0~15之間)
  lc.clearDisplay(0);    // 清除螢幕
}

void loop() {
  X = analogRead(A0);
  Y = analogRead(A1);

  if (X > 700)
    dira = -1;
  else if (X < 300)
    dira = 1;
  else
    dira = 0;

  if (Y > 700)
    dirb = 1;
  else if (Y < 300)
    dirb = -1;
  else
    dirb = 0;

  if (count % 20 == 0)
  {
    move();
  }

  if (Ma==a && Mb==b)
  {
    newone();
  }

  if (count >= 10000)
    count = 0;

  delay(10);
  count++;
}

void my_ISR()
{
  go = !go;
}

void showXY()
{
  Serial.print("X: ");
  Serial.print(X);
  Serial.print("  Y: ");
  Serial.print(Y);
  Serial.print("  Go: ");
  Serial.println(go);
}

void newone()
{
  a = random(0, 7);
  b = random(0, 7);
  lc.setLed(0, a, b, 1);
}

void move()
{
  lc.setLed(0, Ma, Mb, 0);

  Ma = Ma + dira;
  Mb = Mb + dirb;

  if (Ma>7)
    Ma=7;
  if (Ma<0)
    Ma=0;

  if (Mb>7)
    Mb=7;
  if (Mb<0)
    Mb=0;

  lc.setLed(0, Ma, Mb, 1);
}