Bouncing Square with moving acceleration

Data de publicació: Mar 18, 2018 8:21:35 AM

//gcc game_02.c -lm -lSDL2 -lSDL2main -o game_02

#include <SDL2/SDL.h>

#include <math.h>

#define true     1

#define false     0

//Screen dimension in pixels

#define _W 900

#define _H 900

//Dimension of the real world in meters

#define World_W 100000

#define World_H 100000

typedef struct object{

     SDL_Rect rect;

     double x;

     double y;

     double v;

     double a;

     double vx;

     double vy;

     double ax;

     double ay;

    double angle;

} t_object;

//Seconds

float dt;

void    _init_aleat();

int    _aleat(int n);

int main(int argc, char ** argv)

{

    int quit = false;

    SDL_Event event;

     t_object object;

    SDL_Init(SDL_INIT_VIDEO);

    SDL_Window * window = SDL_CreateWindow("SDL2 Bouncing Square ", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, _W, _H, 0);

    SDL_Renderer * renderer = SDL_CreateRenderer(window, -1, 0);

    _init_aleat();

    dt = 1;

    object.rect.w = 10;

    object.rect.h = 10;

    object.v = 2;

    object.a = 0.001;

    object.angle = 0.5;

    object.x = World_W / 2;

    object.y = World_H / 2;

    object.ax = object.a * cos(object.angle);

    object.ay = object.a * sin(object.angle);

    object.vx = object.v * cos(object.angle);

    object.vy = object.v * sin(object.angle);

    object.rect.x = (int) ((object.x / World_W ) * _W);

    object.rect.y = (int) ((object.y / World_H ) * _H);

    while (!quit)

    {

          if (( SDL_PollEvent(&event) ) && (event.type == SDL_QUIT )) quit = true;

                SDL_SetRenderDrawColor(renderer, 0, 0, 0, SDL_ALPHA_OPAQUE);

                SDL_RenderClear(renderer);

                SDL_SetRenderDrawColor(renderer, 255, 255, 255, SDL_ALPHA_OPAQUE);

                     object.vx = object.vx + object.ax * dt;

                     object.x = object.x + object.vx * dt;

                     if (( object.x >= World_W ) || ( object.x <=0 )) {object.vx = -object.vx; object.ax = -object.ax;}

                      object.vy = object.vy + object.ay * dt;

                     object.y = object.y + object.vy * dt;

                     if (( object.y >= World_H ) || ( object.y <=0 )) {object.vy = -object.vy; object.ay = -object.ay;}

                    object.rect.x = (int) ((object.x / World_W ) * _W);

                     object.rect.y = (int) ((object.y / World_H ) * _H);

                SDL_RenderDrawRect(renderer, &(object.rect));

                SDL_RenderPresent(renderer);

    }

    SDL_DestroyRenderer(renderer);

    SDL_DestroyWindow(window);

    SDL_Quit();

    return 0;

}

void    _init_aleat(){srand(time(NULL));}

int    _aleat(int n){return rand() % n;}