Question

How to create rectangle on random places on window using SDL2 in C

Answer 1

#include <stdio.h>
#include <SDL.h>

int main(int argc, char* argv[]) {

    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "SDL_Init Error: %s", SDL_GetError());
        return 3;
    }

    SDL_Window* window = SDL_CreateWindow("Create Rectangle",
        SDL_WINDOWPOS_UNDEFINED,
        SDL_WINDOWPOS_UNDEFINED,
        800, 600,
        SDL_WINDOW_RESIZABLE);

    SDL_Rect r;
    r.w = 90;
    r.h = 40;

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

    SDL_Texture* texture = SDL_CreateTexture(renderer,
        SDL_PIXELFORMAT_RGBA8888,
        SDL_TEXTUREACCESS_TARGET,
        800,
        600);

    SDL_Event event;
    while (1) {
        SDL_PollEvent(&event);
        if (event.type == SDL_QUIT)
            break;

        r.x = rand() % 500;
        r.y = rand() % 500;

        SDL_SetRenderTarget(renderer, texture);
        SDL_SetRenderDrawColor(renderer, 0x00, 0x77, 0x00, 0x00);
        SDL_RenderClear(renderer);

        SDL_RenderDrawRect(renderer, &r);
        SDL_SetRenderDrawColor(renderer, 0xFF, 0x00, 0x00, 0x00);
        SDL_RenderFillRect(renderer, &r);

        SDL_SetRenderTarget(renderer, NULL);
        SDL_RenderCopy(renderer, texture, NULL, NULL);
        SDL_RenderPresent(renderer);
    }

    SDL_DestroyRenderer(renderer);
    SDL_Quit();

    return 0;
}

 

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