protected override void LoadContent()
{
_spriteBatch = new SpriteBatch(GraphicsDevice);
_bitmapFont = Content.Load<BitmapFont>("montserrat-32");
var viewportAdapter = new BoxingViewportAdapter(Window, GraphicsDevice, 800, 480);
_camera = new Camera2D(viewportAdapter)
{
Zoom = 2.0f
};
_sceneGraph = new SceneGraph();
var carHullTexture = Content.Load<Texture2D>("car-hull");
var carHullSprite = new Sprite(carHullTexture);
var carWheelTexture = Content.Load<Texture2D>("car-wheel");
var carWheelSprite = new Sprite(carWheelTexture);
_carNode = new SceneNode("car-hull", viewportAdapter.Center.ToVector2());
_carNode.Entities.Add(carHullSprite);
_leftWheelNode = new SceneNode("left-wheel", new Vector2(-29, 17));
_leftWheelNode.Entities.Add(carWheelSprite);
_rightWheelNode = new SceneNode("right-wheel", new Vector2(40, 17));
_rightWheelNode.Entities.Add(carWheelSprite);
_carNode.Children.Add(_rightWheelNode);
_carNode.Children.Add(_leftWheelNode);
_sceneGraph.RootNode.Children.Add(_carNode);
}
protected override void Update(GameTime gameTime)
{
var deltaTime = (float)gameTime.ElapsedGameTime.TotalSeconds;
var keyboardState = Keyboard.GetState();
var mouseState = Mouse.GetState();
if (keyboardState.IsKeyDown(Keys.Escape))
{
Exit();
}
if (keyboardState.IsKeyDown(Keys.W))
{
_speed += deltaTime * 0.5f;
}
if (keyboardState.IsKeyDown(Keys.S))
{
_speed -= deltaTime * 0.5f;
}
_leftWheelNode.Rotation += _speed;
_rightWheelNode.Rotation = _leftWheelNode.Rotation;
_carNode.Position += new Vector2(_speed * 5, 0);
// quick and dirty collision detection
const int maxX = 535;
if (_carNode.Position.X >= maxX)
{
_speed = -_speed * 0.2f;
_carNode.Position = new Vector2(maxX, _carNode.Position.Y);
}
const int minX = 265;
if (_carNode.Position.X <= minX)
{
_speed = -_speed * 0.2f;
_carNode.Position = new Vector2(minX, _carNode.Position.Y);
}
var worldPosition = _camera.ScreenToWorld(mouseState.X, mouseState.Y);
_hoveredNode = _sceneGraph.GetSceneNodeAt(worldPosition);
base.Update(gameTime);
}
public SceneGraph()
{
RootNode = new SceneNode();
}
public SceneGraph()
{
RootNode = new SceneNode();
}
