Why does my shape does not revolve around its center.

[rajhansk]

This is the code I have written, and after pressing R I want it to rotate around itself but it takes center outside the shape and revolves in a weird way.

#include <SFML/Graphics.hpp>

//#include <cstdlib>
//#include <ctime>
//#include<iostream>
using namespace std;
int main()
{


    sf::RenderWindow window(sf::VideoMode(1366, 768), "First render");
    sf::CircleShape Circle(50,6);


    while (window.isOpen())
    {
        sf::Event event;
        while (window.pollEvent(event))
        {
            if (event.type == sf::Event::Closed)
                window.close();
                if(sf::Keyboard::isKeyPressed(sf::Keyboard::G))
    {
        Circle.setFillColor(sf::Color(100,100,100));

    }
    if(sf::Keyboard::isKeyPressed(sf::Keyboard::Up))
        Circle.move(0,-1);
    if(sf::Keyboard::isKeyPressed(sf::Keyboard::Down))
        Circle.move(0,1);
    if(sf::Keyboard::isKeyPressed(sf::Keyboard::Left))
        Circle.move(-1,0);
    if(sf::Keyboard::isKeyPressed(sf::Keyboard::Right))
        Circle.move(1,0);
        }
        if(sf::Keyboard::isKeyPressed((sf::Keyboard::LShift))&&sf::Keyboard::isKeyPressed((sf::Keyboard::Right)))
            Circle.move(5,0);
if(sf::Keyboard::isKeyPressed((sf::Keyboard::LShift))&&sf::Keyboard::isKeyPressed((sf::Keyboard::Left)))
            Circle.move(-5,0);
if(sf::Keyboard::isKeyPressed((sf::Keyboard::LShift))&&sf::Keyboard::isKeyPressed((sf::Keyboard::Up)))
            Circle.move(0,-5);
if(sf::Keyboard::isKeyPressed((sf::Keyboard::LShift))&&sf::Keyboard::isKeyPressed((sf::Keyboard::Down)))
            Circle.move(0,5);
if(sf::Keyboard::isKeyPressed(sf::Keyboard::R))
   Circle.rotate(3);

        window.clear();
        window.draw(Circle);
       // window.draw(shape2);
        window.display();
    }

    return 0;
}

[Laurent]

after pressing R I want it to rotate around itself but it takes center outside the shape and revolves in a weird way

Wanting something is not enough to make it work, usually some code is needed

See there, especially the section about the origin:
https://www.sfml-dev.org/tutorials/2.4/graphics-transform.php#transforming-sfml-entities

[rajhansk]

I am trying to work on my code , Thanks for reply

[rajhansk]

Do I have to set origin of my circle to center and then rotate?

[rajhansk]

how does the set origin works?

if I have a circle of 100 unit radius then if I want to set its origin at center then i have written
entity.setOrigin(100,100); but what if I have a triangle and I need to set origin of the triangle ?

[Laurent]

Do I have to set origin of my circle to center and then rotate?

Just try it yourself and see if it works

how does the set origin works?

It is explained in the documentation and tutorials.

if I have a circle of 100 unit radius then if I want to set its origin at center then i have written
entity.setOrigin(100,100)

Sounds good.

but what if I have a triangle and I need to set origin of the triangle ?

What's the problem with a triangle?

[kepler0]

The simplest way to center the origin of anything is to divide the bounds by 2, for example:

object.setOrigin(object.getGlobalBounds().width / 2, object.getGlobalBounds().height / 2);

[Laurent]

Origin is in local coordinates, this the formula should use getLocalBounds() instead of getGlobalBounds().