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main.ino
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main.ino
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#include <Wire.h>
#include <Adafruit_SSD1306.h>
#include <EEPROM.h>
#include "bitmaps.h"
//#define USEISP
#define USEI2C
const int kScreenWidth = 128, kScreenHeight = 64, kGameWidth = 64, kGameHeight = 32, kMaxLength = 464, kStartLength = 6;
const int OLED_MOSI = 9, OLED_CLK = 10, OLED_DC = 11, OLED_CS = 12, OLED_RESET = 13;
#ifdef USEISP
Adafruit_SSD1306 lcd(kScreenWidth, kScreenHeight, OLED_MOSI, OLED_CLK, OLED_DC, OLED_RESET, OLED_CS);
#endif
#ifdef USEI2C
Adafruit_SSD1306 lcd(kScreenWidth, kScreenHeight, &Wire, -1);
#endif
class PushButton {
unsigned char last_state, is_down, pin;
public:
PushButton(int pin) : last_state(0), is_down(0), pin(pin) {
pinMode(pin, INPUT);
}
void update() {
int state = digitalRead(pin);
if(state != last_state) {
if(state == HIGH) {
is_down = true;
}
}
last_state = state;
}
bool get_state() {
bool down = is_down;
is_down = false;
return down;
}
} left_button{3}, right_button{2};
struct Position {
char x, y;
bool operator==(const Position& other) const {
return x == other.x && y == other.y;
}
Position& operator+=(const Position& other) {
x += other.x;
y += other.y;
return *this;
}
};
void draw_square(Position pos, int color = WHITE) {
lcd.fillRect(pos.x * 2, pos.y * 2, 2, 2, color);
}
bool test_position(Position pos) {
return lcd.getPixel(pos.x * 2, pos.y * 2);
}
const Position kDirPos[4] = {
{0,-1}, {1, 0}, {0, 1}, {-1, 0}
};
struct Player {
Player() { reset(); }
Position pos;
unsigned char tail[kMaxLength];
unsigned char direction;
int size, moved;
void reset() {
pos = {32,16};
direction = 1;
size = kStartLength;
memset(tail, 0, sizeof(tail));
moved = 0;
}
void turn_left() {
direction = (direction + 3) % 4;
}
void turn_right() {
direction = (direction + 1) % 4;
}
void update() {
for(int i = kMaxLength - 1; i > 0; --i) {
tail[i] = tail[i] << 2 | ((tail[i - 1] >> 6) & 3);
}
tail[0] = tail[0] << 2 | ((direction + 2) % 4);
pos += kDirPos[direction];
if(moved < size) {
moved++;
}
}
void render() const {
draw_square(pos);
if(moved < size) {
return;
}
Position tailpos = pos;
for(int i = 0; i < size; ++i) {
tailpos += kDirPos[(tail[(i >> 2)] >> ((i & 3) * 2)) & 3];
}
draw_square(tailpos, BLACK);
}
} player;
struct Item {
Position pos;
void spawn() {
pos.x = random(1, 63);
pos.y = random(1, 31);
}
void render() const {
draw_square(pos);
}
} item;
void wait_for_input() {
do {
right_button.update();
left_button.update();
} while(!right_button.get_state() && !left_button.get_state());
}
void push_to_start() {
lcd.setCursor(26,57);
lcd.print(F("Push to start"));
}
void flash_screen() {
lcd.invertDisplay(true);
delay(100);
lcd.invertDisplay(false);
delay(200);
}
void play_intro() {
lcd.clearDisplay();
lcd.drawBitmap(18, 0, kSplashScreen, 92, 56, WHITE);
push_to_start();
lcd.display();
wait_for_input();
flash_screen();
}
void play_gameover() {
flash_screen();
lcd.clearDisplay();
lcd.drawBitmap(4, 0, kGameOver, 124, 38, WHITE);
int score = player.size - kStartLength;
lcd.setCursor(26, 34);
lcd.print(F("Score: "));
lcd.print(score);
int hiscore;
EEPROM.get(0, hiscore);
if(score > hiscore) {
EEPROM.put(0, score);
hiscore = score;
lcd.setCursor(4, 44);
lcd.print(F("NEW"));
}
lcd.setCursor(26, 44);
lcd.print(F("Hi-Score: "));
lcd.print(hiscore);
push_to_start();
lcd.display();
wait_for_input();
}
void reset_game() {
lcd.clearDisplay();
for(char x = 0; x < kGameWidth; ++x) {
draw_square({x, 0});
draw_square({x, 31});
}
for(char y = 0; y < kGameHeight; ++y) {
draw_square({0, y});
draw_square({63, y});
}
player.reset();
item.spawn();
}
void update_game() {
player.update();
if(player.pos == item.pos) {
player.size++;
item.spawn();
} else if(test_position(player.pos)) {
play_gameover();
reset_game();
}
}
void input() {
right_button.update();
if(right_button.get_state()) {
player.turn_right();
}
left_button.update();
if(left_button.get_state()) {
player.turn_left();
}
}
void render() {
player.render();
item.render();
lcd.display();
}
void setup() {
#ifdef USEISP
lcd.begin(SSD1306_SWITCHCAPVCC);
#endif
#ifdef USEI2C
lcd.begin(SSD1306_SWITCHCAPVCC, 0x3C);
#endif
lcd.setTextColor(WHITE);
play_intro();
reset_game();
}
void loop() {
input();
update_game();
render();
}