C++プログラミングスキルの向上と組み込みシステムのグラフィカル表示機能の実現

#include <iostream>
using namespace std;

class Shape {
public:
    virtual void draw() = 0;
};

class Circle : public Shape {
public:
    void draw() {
        cout << "Drawing a circle" << endl;
    }
};

class Rectangle : public Shape {
public:
    void draw() {
        cout << "Drawing a rectangle" << endl;
    }
};

int main() {
    Shape* shape1 = new Circle();
    Shape* shape2 = new Rectangle();

    shape1->draw();
    shape2->draw();

    delete shape1;
    delete shape2;

    return 0;
}

#include <SDL.h>

int main(int argc, char* args[]) {
    SDL_Init(SDL_INIT_EVERYTHING);

    SDL_Window* window = SDL_CreateWindow("Hello SDL", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 640, 480, SDL_WINDOW_SHOWN);
    SDL_Renderer* renderer = SDL_CreateRenderer(window, -1, 0);
    
    SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);
    SDL_RenderClear(renderer);

    SDL_SetRenderDrawColor(renderer, 0, 255, 0, 255);
    SDL_Rect rect = { 100, 100, 200, 200 };
    SDL_RenderFillRect(renderer, &rect);

    SDL_RenderPresent(renderer);

    SDL_Delay(3000);

    SDL_DestroyRenderer(renderer);
    SDL_DestroyWindow(window);

    SDL_Quit();

    return 0;
}

#include <SDL.h>

int main(int argc, char* args[]) {
    SDL_Init(SDL_INIT_EVERYTHING);

    SDL_Window* window = SDL_CreateWindow("Hello SDL", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 640, 480, SDL_WINDOW_SHOWN);
    SDL_Renderer* renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_PRESENTVSYNC);
    
    SDL_Texture* buffer = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STREAMING, 640, 480);
    Uint32* pixels = new Uint32[640 * 480];

    bool quit = false;
    while (!quit) {
        SDL_Event event;
        while (SDL_PollEvent(&event)) {
            if (event.type == SDL_QUIT) {
                quit = true;
            }
        }

        for (int i = 0; i < 640 * 480; i++) {
            pixels[i] = SDL_MapRGBA(SDL_AllocFormat(SDL_PIXELFORMAT_ARGB8888), 255, 255, 0, 255);
        }

        SDL_UpdateTexture(buffer, NULL, pixels, 640 * sizeof(Uint32));

        SDL_RenderCopy(renderer, buffer, NULL, NULL);
        SDL_RenderPresent(renderer);
    }

    delete[] pixels;

    SDL_DestroyTexture(buffer);
    SDL_DestroyRenderer(renderer);
    SDL_DestroyWindow(window);

    SDL_Quit();

    return 0;
}