#include <iostream>

#include <string>

#include <vector>

​

​

class DrawingAPI {

  public:

    virtual ~DrawingAPI() = default;

    virtual std::string DrawCircle(float x, float y, float radius) const = 0;

};

​

class DrawingAPI01 : public DrawingAPI {

  public:

    std::string DrawCircle(float x, float y, float radius) const override {

      return "API01.circle at " + std::to_string(x) + ":" + std::to_string(y) +

        " - radius: " + std::to_string(radius); 

    }

};

​

class DrawingAPI02 : public DrawingAPI {

  public:

    std::string DrawCircle(float x, float y, float radius) const override {

      return "API02.circle at " + std::to_string(x) + ":" + std::to_string(y) +

        " - radius: " + std::to_string(radius); 

    }

};

​

class Shape {

  public:

    Shape(const DrawingAPI& drawing_api) : drawing_api_(drawing_api) {}

    virtual ~Shape() = default;

​

    virtual std::string Draw() const = 0;

    virtual float ResizeByPercentage(const float percent) = 0;

​

  protected:

    const DrawingAPI& drawing_api_;

};

​

class CircleShape: public Shape {

  public:    

    CircleShape(float x, float y, float radius, const DrawingAPI& drawing_api)

      : Shape(drawing_api), x_(x), y_(y), radius_(radius) {}

​

    std::string Draw() const override {

        return drawing_api_.DrawCircle(x_, y_, radius_);

    }

​

    float ResizeByPercentage(const float percent) override {

      return radius_ *= (1.0f + percent/100.0f);

    }

  private:

    float x_, y_, radius_;

};

​

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

  const DrawingAPI01 api1{};

  const DrawingAPI02 api2{};

  std::vector<CircleShape> shapes {

    CircleShape{1.0f, 2.0f, 3.0f, api1},

    CircleShape{5.0f, 7.0f, 11.0f, api2}

  }; 

​

  for (auto& shape: shapes) {

    shape.ResizeByPercentage(2.5);

    std::cout << shape.Draw() << std::endl;

  }

​

  return 0;

}