carrot-game/carrot_game/carrot_game.ino

#include <Arduino.h>
#include <avr/io.h>
#include <SPI.h>
#include <U8g2lib.h>
#include <Wire.h>
#include <ArduinoNunchuk.h>
#include <Tone.h>
#include "bitmap.h"
#include "sound.h"

const bool SOUND_ENABLE = false;
const short INIT_X = 0;
const short INIT_Y = 48;
const short MAX_X = 90;

// number of milliseconds we refresh screen
const unsigned long display_interval = 100;
// number of milliseconds we refresh nunchuck info
const unsigned long nunchuk_interval = 100;
const unsigned int sound_tempo = 10;

U8G2_ST7920_128X64_2_SW_SPI u8g2(U8G2_R0, /* clock=*/ 2, /* data=*/ 10, /* cs=*/ 7);
//A5 A4 A3 A2
ArduinoNunchuk nunchuk = ArduinoNunchuk();
Tone tone1;

// Carrot position
short posX = INIT_X;
short posY = INIT_Y;
unsigned int nextLaneY = INIT_Y - 16;

unsigned long last_display = millis();
unsigned long last_nunchuck = millis();
unsigned long last_note = millis();
unsigned long next_note = millis();

short notes_index = 0;
short intro_size = sizeof(notes_intro)/sizeof(notes_intro[0]);
short fishes[8][2] = {
                      {0,1},{0,1},{0,16},{0,16},
                      {0,32},{0,32},{0,48},{0,48}
                     };
bool game_init = true;
bool jump = false;
bool jumpBack = false;
bool jumpInProgress = false;
unsigned int score = 0;
unsigned int max_score = 0;
short lives = 5;

//set A3 and A2 has +5V / GND
void nunchuck_setpowerpins()
{
    #define pwrpin PORTC3
    #define gndpin PORTC2
    DDRC |= _BV(pwrpin) | _BV(gndpin);
    PORTC &=~ _BV(gndpin);
    PORTC |=  _BV(pwrpin);
    delay(100);  // wait for things to stabilize        
}

void setup(void) {

  //init serial for debug
	Serial.begin(115200);
  //init nunchuck
  nunchuck_setpowerpins();
  nunchuk.init();
  //init lcd
  u8g2.begin();
  //init sound
  tone1.begin(8);

}

void play_intro(){
  if(SOUND_ENABLE){
      if(millis() >= next_note){
      next_note = millis() + interval_intro[notes_index];
      tone1.play(notes_intro[notes_index], interval_intro[notes_index]);
      if(notes_index < intro_size - 1){
        notes_index++;
      }
    }
  }
}

void play_sound(uint16_t _note, uint32_t _duration){
  if(SOUND_ENABLE){
    tone1.play(_note, _duration);
  }
}

void display_welcome_page() {
  u8g2.setFont(u8g2_font_5x7_mf);
  u8g2.drawStr(0, 7, "Welcome to Carrot game!");
  u8g2.drawStr(15, 25, "Press Z to start.");
  u8g2.drawXBMP(INIT_X, INIT_Y, 16, 16, fish);
  if(max_score != 0){
    char num_str[] = "000";
    sprintf(num_str, "%03d", max_score);
    u8g2.drawStr(50, 50, "Last score: ");
    u8g2.drawStr(110, 50, num_str);
  }
}

void display_game() {
  u8g2.setFont(u8g2_font_4x6_tf);
  u8g2.drawStr(108, 50, "SCORE:");
  u8g2.drawStr(108, 30, "LIVES:");
  u8g2.drawStr(108, 10, "MAX:");
  //draw score
  u8g2.setFont(u8g2_font_5x7_mf);
  char num_str[] = "000";
  sprintf(num_str, "%03d", score);
  u8g2.drawStr(110, 62, num_str);
  sprintf(num_str, "%03d", max_score);
  u8g2.drawStr(110, 20, num_str);
  sprintf(num_str, "%03d", lives);
  u8g2.drawStr(110, 40, num_str);
  //draw fishes
  for (int i = 0; i < 8; i++) {
    if(fishes[i][0] != NULL){
      if(fishes[i][0] < MAX_X){
        u8g2.drawXBMP(fishes[i][0], fishes[i][1], 16, 16, fish_reverse);
      }
    }
  }
  //draw carrot
  u8g2.drawXBMP(posX, posY, 16, 16, carrot);

  
  //swimelanes
  u8g2.drawHLine(0, 0, MAX_X + 16); //top
  u8g2.drawHLine(0, 16, MAX_X + 16);
  u8g2.drawHLine(0, 32, MAX_X + 16); 
  u8g2.drawHLine(0, 48, MAX_X + 16);
  u8g2.drawHLine(0, 63, MAX_X + 16); //bottom
  u8g2.drawVLine(MAX_X + 16, 0, 48);
}

void init_game(){
  score = 0;
  max_score = 0;
  lives = 5;
  posX = INIT_X;
  posY = INIT_Y;
  for ( short i = 0 ; i < 8; i++){
    fishes[i][0]= random(MAX_X + 1,255);
  }
}

void compute_fishes_position(){
  short fish_step = (200 + score)/100;
  for (int i = 0; i < 8; i++) {
    if(fishes[i][0] != NULL){
      //fish alive
      if(fishes[i][0] <= fish_step)
      {
        fishes[i][0] = random(MAX_X+1,255);
        score = score - 10;
        lives = lives - 1;
        
        play_sound(NOTE_B1,300);
        //end game
        if (score <= 0 || lives == 0){
          play_sound(NOTE_G1,300);
          play_sound(NOTE_F1,300);
          play_sound(NOTE_E1,300);
          play_sound(NOTE_D1,300);
          play_sound(NOTE_C1,300);
          game_init = true;
        }
      }
      //move fish to the left
      else{
          fishes[i][0] = fishes[i][0] - fish_step;
      }
      //does carrot eat the fish
      if( (posX > (fishes[i][0] - 8) && posX < (fishes[i][0] + 8)  )
          && (posY > (fishes[i][1] - 8) && posY < (fishes[i][1] + 8)  )
      ){
        fishes[i][0] = random(128,255);
        play_sound(NOTE_B5,100);
        score = score + 10;
        if (score > max_score){
          max_score = score;
        }
      }
    }
  }
}
void compute_cat_position() {
  if (game_init) {
    if (posX < MAX_X - 16) {
      posX = posX + 2;
    }
    else {
      posX = INIT_X;
      if (posY < 48) {
        posY = posY + 16;
      } else {
        posY = INIT_Y;
      }
    }
  }
  //game
  else {
    //compute X pos
    if (nunchuk.analogX < 120 && posX >= 4) {
      if (nunchuk.analogX < 80) {
        if(posX >= 8){
          posX = posX - 8;
        }else{
          posX = posX - 4;
        }
        
      } else {
        posX = posX - 4;
      }
    }
    if (nunchuk.analogX > 140 && posX < (MAX_X - 16)) {
      if (nunchuk.analogX > 180) {
        posX = posX + 8;
      } else {
        posX = posX + 4;
      }
    }
    //compute jump
    //detect a new jump
    if((nunchuk.zButton == 1 || nunchuk.analogY > 160) && !jump && !jumpBack && posY > 0){
        Serial.println("jump!");
        //tone1.play(NOTE_B4,500);
        jump = true;
        jumpInProgress = true;
        nextLaneY = posY - 16;
        posY = posY - 4;
        Serial.println(nextLaneY);
    }
    else {
      //continue a current jump
      if (jump) {
        
        if (posY > nextLaneY && jumpInProgress) {
          posY = posY - 4;
        } else {
          if (posY != nextLaneY){
            jumpInProgress = false;
            posY = posY + 4;
          }
          else{
            jump = false;
          }
        }
      }
    }

    if((nunchuk.cButton == 1 || nunchuk.analogY < 100) && !jump && !jumpBack && posY < 48){
        Serial.println("jump bottom!");
        //tone1.play(NOTE_B2,500);
        jumpBack = true;
        jumpInProgress = true;
        nextLaneY = posY + 16;
        posY = posY + 4;
        Serial.println(nextLaneY);
    }
    else {
      //continue a current jump
      if (jumpBack) {
        
        if (posY < nextLaneY && jumpInProgress) {
          posY = posY + 4;
        } else {
          if (posY != nextLaneY){
            jumpInProgress = false;
            posY = posY - 4;
          }
          else{
            jumpBack = false;
          }
        }
      }
    }
    
  }
}

void loop(void) {
  if(millis() - last_display >= display_interval){
    u8g2.firstPage();
    do {
      if(game_init){
        display_welcome_page();
      } else{
        display_game();
      }
      
    } while ( u8g2.nextPage() );
    last_display = millis();
  }
  if(millis() - last_nunchuck >= nunchuk_interval){
    nunchuk.update();
    if(init){
      if(nunchuk.zButton == 1){
        if(game_init){
          init_game();
          game_init = false;
        }
      }
    }

    last_nunchuck = millis();
    if(game_init){
      play_intro();
    }
    else{
      compute_cat_position();
      compute_fishes_position();
    }
  }
  // Serial.print(posX);
  // Serial.print(' ');
  // Serial.println(posY);
  // Serial.print(nunchuk.analogX, DEC);
  // Serial.print(' ');
  // Serial.println(nunchuk.analogY, DEC);
  // Serial.print(' ');
  // Serial.print(nunchuk.accelX, DEC);
  // Serial.print(' ');
  // Serial.print(nunchuk.accelY, DEC);
  // Serial.print(' ');
  // Serial.print(nunchuk.accelZ, DEC);
  // Serial.print(' ');
  // Serial.print(nunchuk.zButton, DEC);
  // Serial.print(' ');
  // Serial.println(nunchuk.cButton, DEC);
  //delay(interval);
    
}