Step() public method

Take a time step. This performs collision detection, integration, and constraint solution.
public Step ( float dt, int velocityIterations, int positionIterations ) : void
dt float the amount of time to simulate, this should not vary.
velocityIterations int for the velocity constraint solver.
positionIterations int for the position constraint solver.
return void
World Class Documentation
Exemplo n.º 1
0
        static void Main(string[] args)
        {
            // Static Body
            Vec2 gravity = new Vec2(0, -10);
            bool doSleep = true;
            World world = new World(gravity);
            world.SleepingAllowed = doSleep;
            BodyDef groundBodyDef = new BodyDef();
            groundBodyDef.Position.Set(0, -10);
            Body groundBody = world.CreateBody(groundBodyDef);
            PolygonShape groundBox = new PolygonShape();
            groundBox.SetAsBox(50, 10);
            groundBody.CreateFixture(groundBox, 0);

            // Dynamic Body
            BodyDef bodyDef = new BodyDef();
            bodyDef.Type = BodyType.Dynamic;
            bodyDef.Position.Set(0, 4);
            Body body = world.CreateBody(bodyDef);
            PolygonShape dynamicBox = new PolygonShape();
            dynamicBox.SetAsBox(1, 1);
            FixtureDef fixtureDef = new FixtureDef();
            fixtureDef.Shape = dynamicBox;
            fixtureDef.Density = 1;
            fixtureDef.Friction = 0.3f;
            body.CreateFixture(fixtureDef);

            // Setup world
            float timeStep = 1.0f / 60.0f;
            int velocityIterations = 6;
            int positionIterations = 2;

            // Run loop
            for (int i = 0; i < 60; ++i)
            {
                world.Step(timeStep, velocityIterations, positionIterations);
                Vec2 position = body.Position;
                float angle = body.Angle;
                Console.WriteLine("{0:0.00} {1:0.00} {2:0.00}", position.X, position.Y, angle);
            }
        }