C_CPP/05_OO/MP/shapes_main.cpp

#include "../../helpers/AnsiConsole.h"
#include <cmath>
#include <vector>

struct Position {
    int x;
    int y;

    explicit Position(int x_ = 0, int y_ = 0) {
        x = x_;
        y = y_;
    }
};

class Shape {
protected:
    Position position;
    Colors color;
public:
    Shape(Position position, Colors color);
    virtual ~Shape();
    virtual void draw() = 0;
};

Shape::Shape(Position position, Colors color) {
    this->position = position;
    this->color = color;
}

Shape::~Shape() = default;

class Point : public Shape{

public:
    explicit Point(int x, int y, Colors color);
    void draw() override;
};

Point::Point(int x, int y, Colors color) : Shape(Position(x, y), color) {

}

void Point::draw() {
    ansiConsole.printText(position.x, position.y, "*", color);
}

class Circle : public Shape{
protected:
    int _radius;
public:
    explicit Circle(int x = 0, int y = 0, int radius = 0, Colors color = Colors::GREEN);

    void draw() override;
};

Circle::Circle(int x, int y, int radius, Colors color) : Shape(Position(x, y), color) {
    _radius = radius;
}

void Circle::draw() {
    /* see https://de.wikibooks.org/wiki/Formelsammlung_Mathematik:_Geometrie
     * Höhensatz des Euklid
     * */
    int x_start = position.x - _radius / 2;
    int x_stop = position.x + _radius / 2;

    for (int i = x_start; i <= x_stop; i++) {
        double x_relative = double(i) - double(x_start);
        double h = sqrt(x_relative * (x_stop - x_start - x_relative));
        ansiConsole.printText(position.x + int(x_relative) - _radius / 2,
                              static_cast<int>(position.y + h), "#",
                              color);
        ansiConsole.printText(position.x + int(x_relative) - _radius / 2,
                              static_cast<int>(position.y - h), "#",
                              color);

    }
}

class Rectangle : public Shape{
protected:
    int width;
    int height;

public:
    explicit Rectangle(int x = 0, int y = 0, int width = 0, int height = 0, Colors color = Colors::WHITE);
    void draw() override;
};

Rectangle::Rectangle(int x, int y, int width, int height, Colors color) : Shape(Position(x, y), color) {
    this->width = width;
    this->height = height;
}

void Rectangle::draw() {
    int x_start = position.x - (width / 2);
    int x_stop = position.x + (width / 2);

    int y_start = position.y - (height / 2);
    int y_stop = position.y + (height / 2);

    for(int i = x_start; i <= x_stop; i++) {
        ansiConsole.printText(i, position.y - (height / 2), "#", color);
        ansiConsole.printText(i, position.y + (height / 2), "#", color);
    }
    for(int i = y_start; i< y_stop; i++) {
        ansiConsole.printText(position.x + (width / 2), i, "#", color);
        ansiConsole.printText(position.x - (width / 2), i, "#", color);
    }
}

class Scene {
private:
    std::vector<Shape*> shapes;
public:
    explicit Scene(std::vector<Shape*> shapes);
    void draw();
    ~Scene();
};

Scene::Scene(std::vector<Shape*> shapes) : shapes(std::move(shapes)) {

}

void Scene::draw() {
    ansiConsole.clearScreen();
    for(Shape* shape : shapes) {
        shape->draw();
    }
}

Scene::~Scene() {
    for(Shape* shape : shapes) {
        delete shape;
    }
}

int main(int argc, char **argv) {
    std::vector<Shape*> shapes;

    shapes.push_back(new Point(30, 10, Colors::RED));
    shapes.push_back(new Point(28, 8, Colors::BLUE));
    shapes.push_back(new Point(32, 8, Colors::BLUE));


    shapes.push_back(new Circle(30, 10, 10, Colors::WHITE));
    shapes.push_back(new Circle(30, 20, 15, Colors::GREEN));


    shapes.push_back(new Rectangle(5, 21, 10, 10, Colors::MAGENTA));


    auto *s = new Scene(shapes);
    s->draw();

    delete s;


    return 0;
}