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Starting with Asteroids

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Raimon Zamora
2020-11-20 19:00:16 +01:00
parent 598eaff617
commit a7faac9994
1 changed files with 92 additions and 0 deletions
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asteroids.cpp Normal file
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#include <SDL2/SDL.h>
#include <time.h>
struct Model { int num_lines; SDL_FPoint lines[10]; SDL_FPoint pos, speed; float angle; };
struct Bullet { int ttl; SDL_FPoint pos, speed; };
Model model[20];
Bullet bullet[20];
SDL_FPoint wl[10];
int main(int argc, char* argv[]) {
srand(time(NULL));
SDL_Init(SDL_INIT_EVERYTHING);
SDL_Window* sdlWindow = SDL_CreateWindow("ASTEROIDS", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 800, 600, SDL_WINDOW_SHOWN);
SDL_Renderer* sdlRenderer = SDL_CreateRenderer(sdlWindow, -1, SDL_RENDERER_PRESENTVSYNC);
model[0].num_lines = 3; model[0].lines[0] = {15, 0}; model[0].lines[1] = {-10, 10}; model[0].lines[2] = {-10, -10}; model[0].pos = {400, 300};
for (int i=1; i<4; i++) {
model[i].num_lines = 8;
model[i].pos = { 100+rand()%600, 100+rand()%400 };
model[i].angle = rand()%360;
model[i].speed.x = (rand()%10) * 0.1f * SDL_cosf(model[i].angle*M_PI/180.0f);
model[i].speed.y = (rand()%10) * 0.1f * SDL_sinf(model[i].angle*M_PI/180.0f);
float da = 0.0f;
for (int j=0; j<model[i].num_lines; j++) {
model[i].lines[j].x = (30+rand()%15) * SDL_cosf(da*M_PI/180);
model[i].lines[j].y = (30+rand()%15) * -SDL_sinf(da*M_PI/180);
da += (360/model[i].num_lines);
}
}
SDL_Event sdlEvent;
bool should_exit = false;
while(!should_exit) {
while(SDL_PollEvent(&sdlEvent)) {
if (sdlEvent.type == SDL_QUIT) { should_exit = true; break; }
if (sdlEvent.type == SDL_KEYDOWN) {
if (sdlEvent.key.keysym.scancode == SDL_SCANCODE_SPACE) {
int i = 0;
while (i<20 && bullet[i].ttl > 0) i++;
bullet[i].pos.x = model[0].pos.x;
bullet[i].pos.y = model[0].pos.y;
bullet[i].speed.x = 8.0f * SDL_cosf(model[0].angle*M_PI/180.0f);
bullet[i].speed.y = -8.0f * SDL_sinf(model[0].angle*M_PI/180.0f);
bullet[i].ttl = 100;
}
}
}
const Uint8* keys = SDL_GetKeyboardState(NULL);
if (keys[SDL_SCANCODE_RIGHT]) model[0].angle-=10;
if (keys[SDL_SCANCODE_LEFT]) model[0].angle+=10;
if (keys[SDL_SCANCODE_UP]) { model[0].speed.x += 0.1f * SDL_cosf(model[0].angle*M_PI/180.0f); model[0].speed.y -= 0.1f * SDL_sinf(model[0].angle*M_PI/180.0f); }
for(int i=0; i<20; i++) if (model[i].num_lines > 0) {
model[i].pos.x += model[i].speed.x;
model[i].pos.y += model[i].speed.y;
if (model[i].pos.x < -20) model[i].pos.x += 840;
if (model[i].pos.x > 820) model[i].pos.x -= 840;
if (model[i].pos.y < -20) model[i].pos.y += 640;
if (model[i].pos.y > 620) model[i].pos.y -= 640;
if (i > 0) model[i].angle++;
}
for (int i=0; i<20; i++) if (bullet[i].ttl > 0) {
bullet[i].pos.x += bullet[i].speed.x;
bullet[i].pos.y += bullet[i].speed.y;
if (bullet[i].pos.x < -20) bullet[i].pos.x += 840;
if (bullet[i].pos.x > 820) bullet[i].pos.x -= 840;
if (bullet[i].pos.y < -20) bullet[i].pos.y += 640;
if (bullet[i].pos.y > 620) bullet[i].pos.y -= 640;
bullet[i].ttl--;
}
SDL_SetRenderDrawColor(sdlRenderer, 0, 0, 0, 255);
SDL_RenderClear(sdlRenderer);
SDL_SetRenderDrawColor(sdlRenderer, 255, 255, 255, 255);
for (int i=0; i<20; i++) if (model[i].num_lines > 0) {
for (int j=0; j<model[i].num_lines; j++) {
wl[j].x = model[i].lines[j].x * SDL_cosf(model[i].angle*M_PI/180.0f) + model[i].lines[j].y * SDL_sinf(model[i].angle*M_PI/180.0f) + model[i].pos.x;
wl[j].y = -model[i].lines[j].x * SDL_sinf(model[i].angle*M_PI/180.0f) + model[i].lines[j].y * SDL_cosf(model[i].angle*M_PI/180.0f) + model[i].pos.y;
}
wl[model[i].num_lines] = wl[0];
SDL_RenderDrawLinesF(sdlRenderer, wl, model[i].num_lines+1);
}
for (int i=0; i<20; i++) if (bullet[i].ttl > 0) {
SDL_Rect rect { bullet[i].pos.x, bullet[i].pos.y, 2, 2};
SDL_RenderDrawRect(sdlRenderer, &rect);
}
SDL_RenderPresent(sdlRenderer);
}
SDL_Quit();
return 0;
}