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#include <stdio.h>
#include <stdlib.h>
#include <raylib.h>
#include <math.h>
#include <time.h>
const int width = 800;
const int height = 800;
const int fps = 60;
const Color bg = BLACK;
const Color fg = GREEN;
const float NOSE = PI/8;
const int LENGTH = 36;
const float THRUST = 0.1;
const int SPAWN_RATE = 10*60;
const float S_SPEED = 4.0f;
const int LAZER_LENGTH = 8;
typedef struct B {
Vector2 pos;
Vector2 vel;
int size;
} Asteroid, Bullet;
Vector2 sky[256];
Asteroid asteroids[64];
Bullet bullets[8];
Vector2 pos = {(float) height / 2, (float) width / 2};
Vector2 vel = {0.0f, 0.0f};
float angle = 0;
int l = 0;
int clamp(Vector2 *vec) {
if (vec->x > width+LENGTH) vec->x -= width+LENGTH;
if (vec->x < -LENGTH) vec->x += width+LENGTH*2;
if (vec->y > height+LENGTH) vec->y -= height+LENGTH;
if (vec->y < -LENGTH) vec->y += height+LENGTH*2;
}
double magnitude(Vector2 *vec) {
return sqrt(pow(vec->x, 2) + pow(vec->y, 2));
}
int randVec(Vector2 *vec, float m) {
vec->x = rand() % 256;
vec->y = rand() % 256;
double mag = magnitude(vec);
vec->x /= mag;
vec->y /= mag;
vec->x *= m;
vec->y *= m;
}
Vector2 wingpos(int w) {
int x, y;
float a;
if (w > 0) a = angle + (NOSE / 2.0f);
else if (w < 0) a = angle - (NOSE / 2.0f);
x = pos.x - LENGTH * sin(a);
y = pos.y - LENGTH * cos(a);
return (Vector2){x, y};
}
int drawPlayer() {
DrawTriangleLines(
pos,
wingpos(-1),
wingpos(1),
fg
);
}
int shoot() {
Vector2 position = pos;
Vector2 velocity = (Vector2){
S_SPEED * sin(angle),
S_SPEED * cos(angle)
};
int i = 0;
while (i < sizeof(bullets) / sizeof(Bullet)) {
if (bullets[i].size == 0) {
bullets[i].pos = position;
bullets[i].vel = velocity;
bullets[i].size = 1;
break;
}
i++;
}
}
int addAsteroid(Vector2 position, Vector2 velocity, int size) {
int i = 0;
while (i < sizeof(asteroids) / sizeof(Asteroid)) {
if (asteroids[i].size == 0) {
asteroids[i].pos.x = position.x;
asteroids[i].pos.y = position.y;
asteroids[i].vel.x = velocity.x;
asteroids[i].vel.y = velocity.y;
asteroids[i].size = size;
return 0;
}
i++;
}
return 1;
}
int spawnAsteroid() {
Vector2 s,v;
if (rand() % 2 == 0) {
s = (Vector2){0, rand() % height};
} else {
s = (Vector2){rand() % width, 0};
}
float n = -sqrt(pow(s.x - (width/2), 2) + pow(s.y - (height/2), 2));
float m = (float)(rand() % 4 + 1);
v = (Vector2){
(s.x-(width/2)) / n,
(s.y-(height/2)) / n
};
addAsteroid(s, v, (rand()%4)+1);
}
int breakAsteroid(int i) {
asteroids[i].size -= 1;
if (asteroids[i].size > 0) {
double m = magnitude(&asteroids[i].vel)*0.5d;
randVec(&asteroids[i].vel, m);
addAsteroid(
asteroids[i].pos,
(Vector2){-asteroids[i].vel.x, -asteroids[i].vel.y},
asteroids[i].size
);
}
}
int draw() {
if (IsKeyDown(KEY_RIGHT)) angle -= 0.1f;
if (IsKeyDown(KEY_LEFT)) angle += 0.1f;
if (IsKeyDown(KEY_UP)) {
vel.x += sin(angle) * THRUST;
vel.y += cos(angle) * THRUST;
}
if (IsKeyDown(KEY_SPACE)) {
if (l == 0) {
shoot();
l = 1;
}
} else {
l = 0;
}
pos.x += vel.x;
pos.y += vel.y;
clamp(&pos);
if (rand() % SPAWN_RATE == 0) {
spawnAsteroid();
}
BeginDrawing();
ClearBackground(BLACK);
for (int i = 0; i < 256; i++) {
DrawPixelV(sky[i], fg);
}
drawPlayer();
for (int i=0; i < sizeof(bullets) / sizeof(Bullet); i++) {
Bullet *b = &bullets[i];
if (b->size > 0) {
DrawLineV( b->pos,
(Vector2){b->pos.x - LAZER_LENGTH*b->vel.x, b->pos.y - LAZER_LENGTH*b->vel.y},
fg
);
b->pos.x += b->vel.x;
b->pos.y += b->vel.y;
clamp(&b->pos);
for (int j=0; j < sizeof(asteroids) / sizeof(Asteroid); j++) {
if (CheckCollisionPointCircle(b->pos, asteroids[j].pos, pow(2, asteroids[j].size + 1))) {
b->size=0;
breakAsteroid(j);
break;
}
}
}
}
for (int i=0; i < sizeof(asteroids) / sizeof(Asteroid); i++) {
if (asteroids[i].size > 0) {
DrawCircleLines(
asteroids[i].pos.x,
asteroids[i].pos.y,
pow(2, asteroids[i].size + 1),
fg
);
asteroids[i].pos.x += asteroids[i].vel.x;
asteroids[i].pos.y += asteroids[i].vel.y;
clamp(&asteroids[i].pos);
}
}
EndDrawing();
}
int main() {
srand(time(0));
for (int i = 0; i < 256; i++) {
sky[i] = (Vector2){rand() % width, rand() % height};
}
for (int i=0; i < sizeof(asteroids) / sizeof(Asteroid); i++) {
asteroids[i] = (Asteroid){(Vector2){0,0}, (Vector2){0,0}, 0};
}
for (int i=0; i < sizeof(bullets) / sizeof(bullets); i++) {
bullets[i] = (Bullet){(Vector2){0,0}, (Vector2){0,0}, 0};
}
for (int i = 1; i < rand()%10; i++) {
spawnAsteroid();
}
InitWindow(width, height, "game");
Vector2 m = GetMonitorPosition(1);
SetWindowPosition(m.x, m.y);
SetTargetFPS(60);
while (!WindowShouldClose()) {
draw();
}
CloseWindow();
return 0;
}
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