galaga.c

#include <stdio.h>
#include <conio.h>
#include <Windows.h>

#define MAX_BULLETS_COUNT 100

typedef struct {
    int alive;
    char ch;
    int x, y, color;
} Object;

Object player = {.alive = 1, .ch = '@', .x = 0, .y = 24, .color = 0x0a};
Object bullets[MAX_BULLETS_COUNT] = {0, };

void erase_object(Object object) {
    COORD pos = {.X = object.x,.Y = object.y};

    SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), pos);
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), 0);
    putchar(' ');
}

void draw_object(Object object) {
    COORD pos = {.X = object.x, .Y = object.y};

    SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), pos);
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), object.color);
    putchar(object.ch);
}

void shoot() {
    for (int i = 0; i < MAX_BULLETS_COUNT; ++i) {
        if (!bullets[i].alive) {
            bullets[i].alive = 1;
            bullets[i].ch = '^';
            bullets[i].x = player.x;
            bullets[i].y = player.y;
            bullets[i].color = 0x0f;
            break;
        }
    }
}

void move_bullets() {
    for (int i = 0; i < MAX_BULLETS_COUNT; ++i) {
        if (bullets[i].alive) {
            erase_object(bullets[i]);

            if (--bullets[i].y < 0) {
                bullets[i].alive = 0;
            }
            else {
                draw_object(bullets[i]);
            }
        }
    }
}

int main() {
    int last_bullets_moved = 0;

    srand(GetTickCount());

    while (1) {
        int now = GetTickCount();

        if (_kbhit()) {
            erase_object(player);

            switch (_getch()) {
            case 75:
                if (--player.x < 0) {
                    player.x = 0;
                }
                break;
            case 77:
                if (++player.x > 78) {
                    player.x = 78;
                }
                break;
            case 32:
                shoot();
                break;
            }
        }

        if (now - last_bullets_moved >= 100) {
            move_bullets();

            last_bullets_moved = now;
        }

        draw_object(player);

        Sleep(10);
    }

    return 0;
}