Ximon78-snake

2020-12-19 15:30:00

Snake.ino

#include "LedControl.h"

#define LEFT  A1
#define UP    A2
#define DOWN  A3
#define RIGHT A4

#define START_LEN 3

const int DIN_PIN = 4;
const int CS_PIN = 3;
const int CLK_PIN = 2;
LedControl lc = LedControl(DIN_PIN, CLK_PIN, CS_PIN);

int direction = 2;
int vx = 1;
int vy = 0;

//define the snake array with shape (64,2)
//i.e. a max of 64 parts and 2 (x,y) values per part
int snake[64][2];
//we can only call extend_snake when the snake already
//has one block, so we define it with one
int snake_len = 1;
//an x,y pair of the apple location
int apple[2];
//boolean - is the game over?
bool gameover = false;

void setup(){
    Serial.begin(9600);
    //setup the chip (wake it, set brighntess, clear it)
    lc.shutdown(0,false);
    lc.setIntensity(0,1);
    lc.clearDisplay(0);
    pinMode(RIGHT, INPUT_PULLUP);
    pinMode(DOWN,  INPUT_PULLUP);
    pinMode(UP,    INPUT_PULLUP);
    pinMode(LEFT,  INPUT_PULLUP);
    randomSeed(analogRead(0));
    snake[0][0] = random(0,8);
    snake[0][1] = random(0,8);
    for (int i = snake_len; i < START_LEN; i++){
        extend_snake();
    }
    new_apple();
}

void loop(){
    //if (am_i_dead()) return;
    check_buttons();
    move_snake();
    check_eaten_apple();
    draw();
    delay(150);
}

bool am_i_dead(){
    for (int i = 0; i < snake_len-2; i++){
        if (snake[i][0] == snake[snake_len-1][0] && snake[i][1] == snake[snake_len-1][1]){
            return true;
        }
    }
    return false;
}

void check_eaten_apple(){
    if (snake[snake_len-1][0] == apple[0] && snake[snake_len-1][1] == apple[1]){    //eaten an apple
        extend_snake();
        new_apple();
    }
}

void new_apple() {
     apple[0] = random(0,8);
     apple[1] = random(0,8);
}

void move_snake(){
    for (int i = 0; i < snake_len-1; i++){
        snake[i][0] = snake[i+1][0];
        snake[i][1] = snake[i+1][1];
    }
    snake[snake_len-1][0] = (snake[snake_len - 2][0] + vx + 8) % 8;
    snake[snake_len-1][1] = (snake[snake_len - 2][1] + vy + 8) % 8;
}

void extend_snake(){
    snake[snake_len][0] = (snake[snake_len - 1][0] + vx + 8) % 8;
    snake[snake_len][1] = (snake[snake_len - 1][1] + vy + 8) % 8;
    snake_len++;
}

void draw(){
    lc.clearDisplay(0);
    for (int i = 0; i < snake_len ; i++){
        lc.setLed(0, snake[i][0], snake[i][1], HIGH);
    }
    lc.setLed(0, apple[0], apple[1], HIGH);
}

void _up() {
  vx = -1;
  vy = 0;
  direction = 0;
}

void _right() {
  vx = 0;
  vy = 1;
  direction = 1;
}

void _down() {
  vx = 1;
  vy = 0;
  direction = 2;
}

void _left() {
  vx = 0;
  vy = -1; 
  direction = 3;
}



void check_buttons(){
   if (digitalRead(UP)){ _up(); }
   if (digitalRead(DOWN)){ _down(); }

   if (digitalRead(LEFT)){ _left(); }
   if (digitalRead(RIGHT)){ _right(); }
}