cpSpace *space = cpSpaceNew();
cpSpaceSetIterations(space, 30);
cpSpaceSetGravity(space, cpv(0, -100));
cpSpaceSetSleepTimeThreshold(space, 0.5f);

cpBody *staticBody = cpSpaceGetStaticBody(space);

// Create segments around the edge of the screen.
cpShape *shape;
shape = cpSpaceAddShape(space, cpSegmentShapeNew(staticBody, cpv(-300,-300), cpv(-300,300), 0.0f));
cpShapeSetElasticity(shape, 1.0f);
cpShapeSetFriction(shape, 1.0f);

shape = cpSpaceAddShape(space, cpSegmentShapeNew(staticBody, cpv(300,-300), cpv(300,300), 0.0f));
cpShapeSetElasticity(shape, 1.0f);
cpShapeSetFriction(shape, 1.0f);

shape = cpSpaceAddShape(space, cpSegmentShapeNew(staticBody, cpv(-300,-300), cpv(300,-300), 0.0f));
cpShapeSetElasticity(shape, 1.0f);
cpShapeSetFriction(shape, 1.0f);

shape = cpSpaceAddShape(space, cpSegmentShapeNew(staticBody, cpv(-300,300), cpv(300,300), 0.0f));
cpShapeSetElasticity(shape, 1.0f);
cpShapeSetFriction(shape, 1.0f);

cpFloat radius = 10;
cpFloat mass = 4;

// The moment of inertia is like mass for rotation
// Use the cpMomentFor*() functions to help you approximate it.
cpFloat moment = cpMomentForCircle(mass, 0, radius, cpvzero);

// The cpSpaceAdd*() functions return the thing that you are adding.
// It's convenient to create and add an object in one line.
cpBody *ballBody = cpSpaceAddBody(space, cpBodyNew(mass, moment));
cpBodySetPosition(ballBody, cpv(0, 15));

// Now we create the collision shape for the ball.
// You can create multiple collision shapes that point to the same body.
// They will all be attached to the body and move around to follow it.
cpShape *ballShape = cpSpaceAddShape(space, cpCircleShapeNew(ballBody, radius, cpvzero));
cpShapeSetFriction(ballShape, 0.7);

Camera2D cam = {0};
cam.offset = {300, 300};
cam.zoom = 1;

double timeStep = 1/60.0;
double lastTime = GetTime();
double deltaTime = GetTime();
while(!WindowShouldClose())
{
    PollInputEvents();
    ClearBackground(BLUE);

    deltaTime = GetTime() - lastTime;
    if(deltaTime < 1/60.0)
    {
        WaitTime(1/60.0-deltaTime);
        deltaTime = GetTime() - lastTime;
    }
    lastTime = GetTime();

    cpVect pos = cpBodyGetPosition(ballBody);
    cpVect vel = cpBodyGetVelocity(ballBody);

    BeginMode2D(cam);
        DrawCircle(pos.x, pos.y, radius, WHITE);
    EndMode2D();

    cpSpaceStep(space, timeStep);

    SwapScreenBuffer();
}

// Clean up our objects and exit!
cpShapeFree(ballShape);
cpBodyFree(ballBody);
cpBodyFree(staticBody);
cpSpaceFree(space);

CloseAudioDevice();
CloseWindow();