C_CPP/05_OO/MP/shapes_main.cpp

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

struct Position {
    int x;
    int y;

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

class Point {
protected:
    Position _position;
public:
    Point(int x = 0, int y = 0);

    void draw();
};

Point::Point(int x, int y) {
    _position = Position(x, y);
}

void Point::draw() {
    ansiConsole.printText(_position.x, _position.y, "*", Colors::RED);
}

class Circle {
protected:
    Position _position;
    int _radius;
public:
    Circle(int x = 0, int y = 0, int radius = 0);

    void draw();
};

Circle::Circle(int x, int y, int radius) {
    _position = Position(x, y);
    _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,
                              _position.y + h, "#",
                              Colors::GREEN);
        ansiConsole.printText(_position.x + int(x_relative) - _radius / 2,
                              _position.y - h, "#",
                              Colors::GREEN);

    }
}

class Rectangle {
protected:
    Position position;
    int width;
    int height;

public:
    Rectangle(int x = 0, int y = 0, int width = 0, int height = 0);
    void draw();
};

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

int main(int argc, char **argv) {
    // x=1 and y=1 is the upper left corner
    // x and y are more like column and row
    ansiConsole.printText(5, 5, "Hello, World!");

    Point *p = new Point(10, 10);
    p->draw();

    Point *p2 = new Point(2, 10);
    p2->draw();


    Circle *c = new Circle(30, 15, 10);
    c->draw();

    Point *p3 = new Point(30, 15);
    p3->draw();

    Rectangle *r = new Rectangle(20, 20, 20, 20);
    r->draw();


    delete p;
    delete p2;
    delete p3;
    delete c;
    delete r;

    return 0;
}