public void update(GameTime gameTime, Car car)
{
// Calculate target angular acceleration
float angular = car.angle - angle;
// Clamp angular acceleration
if (Math.Abs(angular) > maxAngularAcceleration)
{
angular /= Math.Abs(angular);
angular *= maxAngularAcceleration;
}
if (Math.Abs(angular) < 0.022f)
{
rotation = 0.0f;
angular = 0.0f;
angle = car.angle;
}
// Add angular to rotation
rotation += angular * gameTime.ElapsedGameTime.Milliseconds / 1000.0f;
// Limit rotation
if (Math.Abs(rotation) > maxRotation)
{
rotation /= Math.Abs(rotation);
rotation *= maxRotation;
}
// Add rotation to angle
angle += rotation * gameTime.ElapsedGameTime.Milliseconds / 1000.0f;
Vector3 target = new Vector3((float)System.Math.Sin(-angle), (float)System.Math.Cos(-angle), 0.0f);
target *= distance;
target = car.position - target;
position = target;
// Look ahead
Vector3 lookAt = new Vector3((float)System.Math.Sin(-car.angle), (float)System.Math.Cos(-car.angle), 0.0f);
lookAt.Normalize();
lookAt *= aheadDistance;
lookAt += car.position;
// Update camera view
view = Matrix.CreateLookAt(new Vector3(position.X, height, -position.Y),
new Vector3(lookAt.X, height, -lookAt.Y),
Vector3.UnitY);
}
public void setInitialPosition(Car car)
{
angle = car.angle;
Vector3 translation = new Vector3((float)System.Math.Sin(angle), (float)System.Math.Cos(angle), 0.0f);
translation *= distance;
position = car.position - translation;
game.camera.view = Matrix.CreateLookAt(new Vector3(position.X, height, -position.Y),
new Vector3(car.position.X, height, -car.position.Y),
Vector3.UnitY);
}
public GameState(UrbanRace game)
: base(game)
{
// Initialise attributes and properties
this.type = Type.GAME;
this.laps = 1;
this.levelName = "level.xml";
this.level = null;
this.car = null;
this.checkPoints = new List<CheckPoint>();
this.timeBonuses = new List<TimeBonus>();
this.sceneObjects = new List<GameObject>();
this.geometry = new List<GameObject>();
this.skyBox = null;
this.terrain = null;
this.collisionManager = new CollisionManager();
this.font = null;
this.speedPanel = null;
this.nextCheckPoint = 0;
// Audio
this.song = null;
this.carCrash = null;
this.pickTime = null;
// GUI
speedPanelPos = new Vector2(Settings.getOpt("gameSpeedPanelX"), Settings.getOpt("gameSpeedPanelY"));
speedTextPos = new Vector2(Settings.getOpt("gameSpeedTextX"), Settings.getOpt("gameSpeedTextY"));
lapsPanelPos = new Vector2(Settings.getOpt("gameLapsPanelX"), Settings.getOpt("gameLapsPanelY"));
lapsText1Pos = new Vector2(Settings.getOpt("gameLapsText1X"), Settings.getOpt("gameLapsText1Y"));
lapsText2Pos = new Vector2(Settings.getOpt("gameLapsText2X"), Settings.getOpt("gameLapsText2Y"));
timePanelPos = new Vector2(Settings.getOpt("gameTimePanelX"), Settings.getOpt("gameTimePanelY"));
timeTextPos = new Vector2(Settings.getOpt("gameTimeTextX"), Settings.getOpt("gameTimeTextY"));
// Time (in ms)
this.remainingTime = 0.0;
this.totalTime = 0.0;
this.playTime = 0.0;
// Configure callbacks
collisionManager.addCallback(GameObject.Type.CAR, GameObject.Type.SCENEOBJECT, collisionCarScene, CollisionManager.CallbackType.DURING);
collisionManager.addCallback(GameObject.Type.CAR, GameObject.Type.TIMEBONUS, collisionCarBonus, CollisionManager.CallbackType.BEGIN);
collisionManager.addCallback(GameObject.Type.CAR, GameObject.Type.CHECKPOINT, collisionCarCheckPoint, CollisionManager.CallbackType.BEGIN);
// Load shapes
CollisionManager.initShapeCatalog(game.Content.RootDirectory);
this.spriteBatch = new SpriteBatch(game.GraphicsDevice);
}
public override void unload()
{
// Remove objects from collision manager
collisionManager.removeAllObjects();
// Set every game element to null so we can save memory
car = null;
level = null;
checkPoints.Clear();
timeBonuses.Clear();
sceneObjects.Clear();
geometry.Clear();
skyBox = null;
terrain = null;
font = null;
retroFont = null;
speedPanel = null;
timePanel = null;
MediaPlayer.Stop();
song = null;
carCrash = null;
pickTime = null;
// Clear input callbacks
Input.clearCallbacks();
loaded = false;
}
public override void load()
{
Log.log(Log.Type.INFO, "Loading state game type " + type);
// Parse level and create game objects
level = new Level(this, levelName);
level.load();
// Sort check point list
checkPoints.Sort();
// Create car with level data
car = new Car(game, level.carPosition, level.carOrientation);
// Add gameobjects to collision manager
collisionManager.addObject(car);
foreach (TimeBonus timeBonus in timeBonuses)
{
collisionManager.addObject(timeBonus);
}
foreach (CheckPoint checkPoint in checkPoints)
{
collisionManager.addObject(checkPoint);
}
foreach (GameObject sceneObject in sceneObjects)
{
collisionManager.addObject(sceneObject);
}
font = game.Content.Load<SpriteFont>("Fonts\\LED");
retroFont = game.Content.Load<SpriteFont>("Fonts\\MenuBig");
speedPanel = game.Content.Load<Texture2D>("Images\\speedPanel");
timePanel = game.Content.Load<Texture2D>("Images\\speedPanel");
// Time (in ms)
this.remainingTime = totalTime * 1000.0;
this.playTime = 0.0f;
// Song
song = game.Content.Load<Song>("Audio\\game");
MediaPlayer.IsRepeating = true;
MediaPlayer.Play(song);
// Set input callbacks
Input.setKeyPressedCallback(keyPressed);
Input.setKeyReleasedCallback(keyReleased);
game.camera.setInitialPosition(car);
// Next checkpoint
nextCheckPoint = 0;
lapsDone = 1;
loaded = true;
}
public void collisionCarScene(GameObject o1, GameObject o2)
{
// Get objects
Car car;
GameObject sceneObject;
if (o1.type == GameObject.Type.CAR)
{
car = (Car)o1;
sceneObject = o2;
}
else
{
car = (Car)o2;
sceneObject = o1;
}
OrientedBox obb1 = (OrientedBox)car.shape;
OrientedBox obb2 = (OrientedBox)sceneObject.shape;
// Crash sfx
game.audioEngine.SetGlobalVariable("crashVolume", car.velocity.Length() / car.maxSpeed);
carCrash = game.soundBank.GetCue("crash");
carCrash.Play();
// Restore oldPos
car.position = car.oldPos;
// Get closest point
Vector3 q = CollisionManager.closestPointToOBB(obb1.center + obb1.transform.Translation, obb2);
// Get normal vector
Vector3 normal = obb1.center + obb1.transform.Translation - q;
normal.Normalize();
// Change car velocity to bounce
float angle = (float)Math.Atan2(normal.Y - car.velocity.Y, normal.X - car.velocity.X);
Vector3 newDirection = new Vector3((float)System.Math.Sin(-angle), (float)System.Math.Cos(-angle), 0.0f);
newDirection.Normalize();
car.velocity = newDirection * car.velocity.Length() * 0.85f;
// Get angle between normal and car direction
Vector2 carDirection = new Vector2((float)System.Math.Sin(-car.angle), (float)System.Math.Cos(-car.angle));
Vector2 normal2D = new Vector2(normal.X, normal.Y);
float angleNormalCar = (float)Math.Atan2(normal2D.Y - carDirection.Y, normal2D.X - carDirection.X);
}
