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Add asteroids game
Source code is the same as upstream, aside from a header added.
This commit is contained in:
Justine Tunney
parent
2477677c85
commit
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1 changed files with 346 additions and 0 deletions
346
examples/asteroids.c
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346
examples/asteroids.c
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// -*- mode:c; indent-tabs-mode:nil; c-basic-offset:4 -*-
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// vi: set et ft=c ts=4 sts=4 sw=4 fenc=utf-8
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// asteroids by tsotchke
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// https://github.com/tsotchke/asteroids
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// clang-format off
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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#include <time.h>
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#include <unistd.h>
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#include <termios.h>
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#include <sys/select.h>
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#define SCREEN_WIDTH 80
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#define SCREEN_HEIGHT 24
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#define MAX_ASTEROIDS 5
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#define MAX_BULLETS 5
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typedef struct {
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float x, y;
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} Vector2;
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typedef struct {
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Vector2 position;
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Vector2 velocity;
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float angle;
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float radius;
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} GameObject;
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GameObject spaceship;
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GameObject asteroids[MAX_ASTEROIDS];
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GameObject bullets[MAX_BULLETS];
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int score = 0;
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time_t startTime;
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int isGameOver = 0;
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int finalTime = 0; // To store final time at game over
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char display[SCREEN_HEIGHT][SCREEN_WIDTH];
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// Function to clear the screen buffer
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void clearDisplay() {
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memset(display, ' ', sizeof(display));
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}
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// Function to draw a pixel on the screen
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void drawPixel(int x, int y) {
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if (x >= 0 && x < SCREEN_WIDTH && y >= 0 && y < SCREEN_HEIGHT) {
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display[y][x] = '*';
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}
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}
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// Function to draw a line using Bresenham's algorithm
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void drawLine(int x1, int y1, int x2, int y2) {
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int dx = abs(x2 - x1), sx = (x1 < x2) ? 1 : -1;
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int dy = -abs(y2 - y1), sy = (y1 < y2) ? 1 : -1;
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int error = dx + dy, e2;
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while (1) {
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drawPixel(x1, y1);
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if (x1 == x2 && y1 == y2) break;
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e2 = 2 * error;
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if (e2 >= dy) { error += dy; x1 += sx; }
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if (e2 <= dx) { error += dx; y1 += sy; }
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}
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}
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// Function to draw a circle
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void drawCircle(int centerX, int centerY, int radius) {
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int x = radius - 1, y = 0, dx = 1, dy = 1, err = dx - (radius << 1);
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while (x >= y) {
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drawPixel(centerX + x, centerY + y);
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drawPixel(centerX + y, centerY + x);
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drawPixel(centerX - y, centerY + x);
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drawPixel(centerX - x, centerY + y);
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drawPixel(centerX - x, centerY - y);
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drawPixel(centerX - y, centerY - x);
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drawPixel(centerX + y, centerY - x);
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drawPixel(centerX + x, centerY - y);
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if (err <= 0) {
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y++;
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err += dy;
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dy += 2;
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}
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if (err > 0) {
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x--;
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dx += 2;
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err += dx - (radius << 1);
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}
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}
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}
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// Initialize a game object
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void initializeGameObject(GameObject *obj, float x, float y, float angle, float radius) {
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obj->position = (Vector2){x, y};
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obj->velocity = (Vector2){0, 0};
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obj->angle = angle;
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obj->radius = radius;
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}
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// Wrap position of the spaceship and asteroids within screen bounds
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void wrapPosition(Vector2 *pos) {
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if (pos->x < 0) pos->x = SCREEN_WIDTH - 1;
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if (pos->x >= SCREEN_WIDTH) pos->x = 0;
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if (pos->y < 0) pos->y = SCREEN_HEIGHT - 1;
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if (pos->y >= SCREEN_HEIGHT) pos->y = 0;
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}
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// Check if two game objects are colliding
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int checkCollision(GameObject *a, GameObject *b) {
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float deltaX = a->position.x - b->position.x;
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float deltaY = a->position.y - b->position.y;
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return sqrt(deltaX * deltaX + deltaY * deltaY) < (a->radius + b->radius);
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}
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// Initialize game state
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void initGame() {
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score = 0; // Reset the score
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initializeGameObject(&spaceship, SCREEN_WIDTH / 2, SCREEN_HEIGHT / 2, 0, 2);
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for (int i = 0; i < MAX_ASTEROIDS; i++) {
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initializeGameObject(&asteroids[i],
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rand() % SCREEN_WIDTH,
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rand() % SCREEN_HEIGHT,
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0,
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2 + rand() % 3);
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asteroids[i].velocity.x = ((float)rand() / RAND_MAX) * 2 - 1;
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asteroids[i].velocity.y = ((float)rand() / RAND_MAX) * 2 - 1;
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}
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for (int i = 0; i < MAX_BULLETS; i++) {
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bullets[i].position.x = -1; // Mark bullet as inactive
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bullets[i].position.y = -1;
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}
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startTime = time(NULL);
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isGameOver = 0;
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finalTime = 0; // Reset final time
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}
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// Draw the spaceship on the screen
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void drawSpaceship() {
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int x = (int)spaceship.position.x;
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int y = (int)spaceship.position.y;
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int size = 3;
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float cosAngle = cos(spaceship.angle);
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float sinAngle = sin(spaceship.angle);
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int x1 = x + size * cosAngle;
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int y1 = y + size * sinAngle;
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int x2 = x + size * cos(spaceship.angle + 2.5);
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int y2 = y + size * sin(spaceship.angle + 2.5);
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int x3 = x + size * cos(spaceship.angle - 2.5);
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int y3 = y + size * sin(spaceship.angle - 2.5);
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drawLine(x1, y1, x2, y2);
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drawLine(x2, y2, x3, y3);
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drawLine(x3, y3, x1, y1);
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}
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// Draw all entities on the screen
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void drawEntities(GameObject *entities, int count, void (*drawFunc)(GameObject *)) {
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for (int i = 0; i < count; i++) {
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drawFunc(&entities[i]);
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}
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}
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// Draw a bullet on the screen
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void drawBullet(GameObject *bullet) { // Changed to non-const
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if (bullet->position.x >= 0) {
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drawPixel((int)bullet->position.x, (int)bullet->position.y);
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}
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}
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// Draw an asteroid on the screen
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void drawAsteroid(GameObject *asteroid) { // Changed to non-const
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drawCircle((int)asteroid->position.x, (int)asteroid->position.y, (int)asteroid->radius);
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}
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// Refresh the display
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void updateDisplay() {
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clearDisplay();
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if (!isGameOver) {
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drawSpaceship();
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drawEntities(asteroids, MAX_ASTEROIDS, drawAsteroid);
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drawEntities(bullets, MAX_BULLETS, drawBullet);
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}
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// Print the screen buffer
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printf("\033[H");
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for (int y = 0; y < SCREEN_HEIGHT; y++) {
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for (int x = 0; x < SCREEN_WIDTH; x++) {
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putchar(display[y][x]);
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}
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putchar('\n');
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}
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// Display score and elapsed time
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time_t currentTime = time(NULL);
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int elapsedTime = isGameOver ? finalTime : (currentTime - startTime);
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printf("Score: %d | Time: %02d:%02d | %s\n", score, elapsedTime / 60, elapsedTime % 60, isGameOver ? "Game Over!" : " ");
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}
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// Update the position of game objects
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void updateGameObject(GameObject *obj, int isBullet) {
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obj->position.x += obj->velocity.x;
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obj->position.y += obj->velocity.y;
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// If it's a bullet, check if it's out of bounds
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if (isBullet) {
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if (obj->position.x < 0 || obj->position.x >= SCREEN_WIDTH || obj->position.y < 0 || obj->position.y >= SCREEN_HEIGHT) {
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obj->position.x = -1; // Deactivate bullet
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obj->position.y = -1;
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}
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} else {
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wrapPosition(&obj->position);
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}
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}
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// Update the game state
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void updateGame() {
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if (isGameOver) return;
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// Update spaceship and apply friction
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updateGameObject(&spaceship, 0); // 0 indicates it's not a bullet
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spaceship.velocity.x *= 0.98;
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spaceship.velocity.y *= 0.98;
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// Move asteroids and check for collisions
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for (int i = 0; i < MAX_ASTEROIDS; i++) {
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updateGameObject(&asteroids[i], 0);
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if (checkCollision(&spaceship, &asteroids[i])) {
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isGameOver = 1;
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finalTime = time(NULL) - startTime;
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return;
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}
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}
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// Update bullet positions
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for (int i = 0; i < MAX_BULLETS; i++) {
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if (bullets[i].position.x >= 0) {
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updateGameObject(&bullets[i], 1); // 1 indicates it's a bullet
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}
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}
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// Check for bullet collisions with asteroids
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for (int i = 0; i < MAX_BULLETS; i++) {
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if (bullets[i].position.x >= 0) {
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for (int j = 0; j < MAX_ASTEROIDS; j++) {
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if (checkCollision(&bullets[i], &asteroids[j])) {
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bullets[i].position.x = -1; // Deactivate bullet
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bullets[i].position.y = -1;
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asteroids[j].position.x = rand() % SCREEN_WIDTH;
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asteroids[j].position.y = rand() % SCREEN_HEIGHT;
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score += 100;
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}
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}
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}
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}
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}
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// Fire a bullet
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void shootBullet() {
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for (int i = 0; i < MAX_BULLETS; i++) {
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if (bullets[i].position.x < 0) {
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bullets[i].position = spaceship.position;
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bullets[i].velocity.x = cos(spaceship.angle) * 2;
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bullets[i].velocity.y = sin(spaceship.angle) * 2;
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break;
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}
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}
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}
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// Check if a key was hit
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int isKeyHit() {
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struct timeval tv = { 0L, 0L };
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fd_set fds;
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FD_ZERO(&fds);
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FD_SET(0, &fds);
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return select(1, &fds, NULL, NULL, &tv);
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}
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// Configure terminal settings
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void configureTerminal(struct termios *old_tio, struct termios *new_tio) {
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tcgetattr(STDIN_FILENO, old_tio);
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*new_tio = *old_tio;
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new_tio->c_lflag &= (~ICANON & ~ECHO);
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tcsetattr(STDIN_FILENO, TCSANOW, new_tio);
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}
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// Restore terminal settings
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void restoreTerminal(struct termios *old_tio) {
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tcsetattr(STDIN_FILENO, TCSANOW, old_tio);
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}
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// Main game loop
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int main() {
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srand(time(NULL)); // Seed the random number generator
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initGame(); // Initialize the game state
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struct termios old_tio, new_tio;
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configureTerminal(&old_tio, &new_tio);
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printf("\033[?25l"); // Hide the cursor
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while (1) {
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if (isKeyHit()) {
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char input = getchar();
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if (input == 27) { // ESC key
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if (getchar() == '[') { // Handle arrow keys
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switch (getchar()) {
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case 'A': // Up arrow
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spaceship.velocity.x += cos(spaceship.angle) * 0.2;
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spaceship.velocity.y += sin(spaceship.angle) * 0.2;
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break;
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case 'B': // Down arrow
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spaceship.velocity.x -= cos(spaceship.angle) * 0.2;
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spaceship.velocity.y -= sin(spaceship.angle) * 0.2;
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break;
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case 'D': spaceship.angle -= 0.2; break; // Left arrow
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case 'C': spaceship.angle += 0.2; break; // Right arrow
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}
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}
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} else if (input == ' ') {
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shootBullet(); // Fire a bullet
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} else if (input == 'q') {
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break; // Quit the game
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} else if (input == 'r' && isGameOver) {
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initGame(); // Restart the game
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}
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}
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updateGame(); // Update game state
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updateDisplay(); // Refresh the display
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usleep(50000); // Wait for 50ms (20 FPS)
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}
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printf("\033[?25h"); // Show the cursor
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restoreTerminal(&old_tio); // Restore terminal settings
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return 0;
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}
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