box2d

#include <iostream>
#include <Box2D/Box2D.h>
#include <SFML/Graphics.hpp>


int main()
{
    sf::RectangleShape rectRender(sf::Vector2f(100,50));
    b2World world(b2Vec2(0, 100));
    world.SetGravity(b2Vec2(0, 100));
    b2BodyDef boxDef;
    boxDef.type = b2_kinematicBody;
    boxDef.position.Set(50, 100);
    b2FixtureDef boxFixDef;
    boxFixDef.friction = 0;
    boxFixDef.restitution = 0;
    b2PolygonShape boxShape;
    boxShape.SetAsBox(50, 25);
    boxFixDef.shape = &boxShape;
    b2Body* body = world.CreateBody(&boxDef);
    body->CreateFixture(&boxFixDef);
    body->SetLinearDamping(0);


    sf::RectangleShape rectRender2(sf::Vector2f(100, 50));  rectRender2.setFillColor(sf::Color::Red);
    b2BodyDef boxDef2;
    boxDef2.type = b2_dynamicBody;
    boxDef2.position.Set(50, 10);
    b2FixtureDef boxFixDef2;
    boxFixDef2.restitution = 0;
    boxFixDef.friction = 0;
    boxFixDef2.density = 20;
    b2PolygonShape boxShape2;
    boxShape2.SetAsBox(50, 25);
    boxFixDef2.shape = &boxShape;
    b2Body* body2 = world.CreateBody(&boxDef2);
    body2->CreateFixture(&boxFixDef2);
    body2->SetLinearDamping(0);


    sf::RenderWindow window(sf::VideoMode(1280, 720), "Box2D Test");
    window.setFramerateLimit(60);
    while (window.isOpen())
    {
        world.Step(1 / 60.f, 8, 3);
        sf::Event event;
        while (window.pollEvent(event))
        {
            if (event.type == sf::Event::Closed)
                window.close();
            if (event.type == sf::Event::KeyPressed)
            {
                body->SetTransform(b2Vec2(body->GetPosition().x + 10, body->GetPosition().y), 0);
            }
        }

        window.clear();
        rectRender.setPosition(body->GetPosition().x, body->GetPosition().y);
        rectRender2.setPosition(body2->GetPosition().x, body2->GetPosition().y);
        window.draw(rectRender);
        window.draw(rectRender2);
        window.display();
        std::cout << body2->GetLinearVelocity().y << std::endl;
    }
    return 0;
}