Box2D stuff

#include <Box2D/Box2D.h>

int main (int argc, char * argv[])
{
//World/ground initialization code directly lifted from OpenGL project
    b2World * world = new b2World(b2Vec2(-5.0f, -5.0f));

    b2BodyDef bd;
    b2Body * ground = world->CreateBody(&bd);

    b2Vec2 vs[4];
    vs[0].Set(-2640.0f, -2640.0f);
    vs[1].Set(-2640.0f, 2640.0f);
    vs[2].Set(2640.0f, 2640.0f);
    vs[3].Set(2640.0f, -2640.0f);

    b2ChainShape loop;
    loop.CreateLoop(vs, 4);
    b2FixtureDef fd;
    fd.shape = &loop;
    fd.density = 0.0f;
    ground->CreateFixture(&fd);

//Define two known circles whose values we can print out
//The initialization code for each circle is directly lifted from the OpenGL project

    b2BodyDef circleDef;
    b2Body * circleBody;
    b2CircleShape circleShape;
    b2FixtureDef circleFixtureDef;

    b2BodyDef circleDef2;
    b2Body * circleBody2;
    b2CircleShape circleShape2;
    b2FixtureDef circleFixtureDef2;

    circleDef.type = b2_dynamicBody;
    circleDef.position.Set(50.0f, 50.0f);
    circleDef.bullet = true;
    circleBody = world->CreateBody(&circleDef);
    circleShape.m_p.Set(50.0f, 50.0f);
    circleShape.m_radius = 50.0f;
    circleFixtureDef.shape = &circleShape;
    circleFixtureDef.density = 1.0f;
    circleFixtureDef.friction = 0.1001f;

    circleDef2.type = b2_dynamicBody;
    circleDef2.position.Set(150.0f, 150.0f);
    circleDef2.bullet = true;
    circleBody2 = world->CreateBody(&circleDef);
    circleShape2.m_p.Set(50.0f, 50.0f);
    circleShape2.m_radius = 50.0f;
    circleFixtureDef2.shape = &circleShape;
    circleFixtureDef2.density = 1.0f;
    circleFixtureDef2.friction = 0.1001f;

    circleBody->CreateFixture(&circleFixtureDef);
    circleBody2->CreateFixture(&circleFixtureDef2);

//Generate a bunch of other circles

    for (int i = 0; i < 40; i++)
    {
        b2BodyDef circleDef;
        b2Body * circleBody;
        b2CircleShape circleShape;
        b2FixtureDef circleFixtureDef;

        circleDef.type = b2_dynamicBody;
        circleDef.position.Set(50.0f * i, 50.0f * i);
        circleDef.bullet = true;
        circleBody = world->CreateBody(&circleDef);
        circleShape.m_p.Set(50.0f * i, 50.0f * i);
        circleShape.m_radius = 50.0f;
        circleFixtureDef.shape = &circleShape;
        circleFixtureDef.density = 1.0f;
        circleFixtureDef.friction = 0.1001f;
    circleBody->CreateFixture(&circleFixtureDef);
    }

//Simulate the world for a while

    for (int i = 0; i < 10000; i++)
    {
        world->Step(0.01667f, 10, 10);
        printf("x: %f, y: %f\n", circleBody->GetPosition().x, circleBody->GetPosition().y);
        printf("x: %f, y: %f\n", circleBody2->GetPosition().x, circleBody2->GetPosition().y);
    }

    return 0;
}