/// <summary>
/// Initializes the World object and everything in it.
/// </summary>
public void InitWorld()
{
//Change to public so it can be called from the gameplay screen.
//the world wont exist till it is class from the GameplayScreen
// Create the World object.
Vector2 gravity = new Vector2(0f, 9.8f);
_world = new World(gravity);
// Make sure that the level has boundaries.
CreateWalls();
// Make sure that bounces against walls are counted.
OnWallCollision += IncrementBounces;
// Create a launcher with a ball in it.
_ball = new Ball(_ballTex);
_ball.InitBody(_world);
_launcher.LoadBall(_ball);
// Add the goal to the world.
_goal.InitBody(_world);
// When the ball touches the goal, conclude the simulation phase.
_goal.OnGoalCollision += Complete;
// Add the platforms to the world.
foreach (Platform plat in _platforms) {
plat.InitBody(_world);
plat.OnPlatformCollision += IncrementBounces;
}
foreach (Platform plat in _moveablePlatforms) {
plat.InitBody(_world);
plat.OnPlatformCollision += IncrementBounces;
}
// Add the treasures to the world.
foreach (Treasure treasure in _treasures) {
treasure.InitBody(_world);
treasure.OnTreasureCollect += IncrementCollected;
}
// Add the death traps to the world.
foreach (DeathTrap trap in _deathTraps) {
trap.InitBody(_world);
trap.OnTrapCollision += EndAttempt;
}
}
/// <summary>
/// Loads a ball into the launcher.
/// </summary>
/// <param name="ball">The ball that will be eventually launched.</param>
public void LoadBall(Ball newBall)
{
if (_ball != null) {
throw new InvalidOperationException("There is already a ball that is ready to be launched.");
}
// The launcher now contains the ball, and the user can now aim it.
_ball = newBall;
_movable = true;
// Make sure that it actually gets displayed.
UpdateBallPos();
}
/// <summary>
/// Constructs a Launcher object.
/// </summary>
/// <param name="textures">An array of textures that will be used to draw the launcher's
/// parts. The texture in index 0 is the "stick", the texture in index 1 is the base, and
/// the texture in index 2 is the power meter. The "stick" should be of length 80, the
/// base should be 120x120, and the power meter should be 80x10.</param>
/// <param name="position">The position of the launcher.</param>
public Launcher(Texture2D[] textures, Vector2 position)
{
// Set the textures.
if (textures != null) {
_rotatorTex = textures[0];
_baseTex = textures[1];
_meterTex = textures[2];
}
// TODO: add texture dimensions check
if (position.X < 0 || position.Y < 0) {
throw new ArgumentOutOfRangeException("The position should not be negative.");
}
// Set the launcher's position.
_position = position;
// At first, the launcher will be empty, and the launcher is only movable
// when there's a ball in it.
_movable = false;
_ball = null;
// Initialize the angle and magnitude, and calculate the initial position of the tip.
_angle = (float)Math.PI / 4; // 45 degrees
_magnitude = 10f;
_tip = new Vector2();
CalculateNewTip();
// Position the ball.
UpdateBallPos();
}
/// <summary>
/// Launches the ball in the launcher.
/// </summary>
public void LaunchBall()
{
// Don't do anything if no ball is in the launcher.
if (!_movable) {
return;
}
// Stop the player from moving the launcher.
_movable = false;
// Calculate the velocity of the ball based on the launcher's angle and magnitude.
float xVelocity = _magnitude * (float)Math.Cos(-1 * _angle);
float yVelocity = _magnitude * (float)Math.Sin(-1 * _angle);
_ball.Launch(xVelocity, yVelocity);
// Call any methods that are waiting for the ball to launch.
if (OnBallLaunch != null) {
OnBallLaunch();
}
// The launcher no longer owns the ball.
_ball = null;
}
/* Put more tests here */
/// <summary>
/// Creates and returns a launcher.
/// </summary>
/// <param name="createBall">Whether a ball should be loaded in the launcher.</param>
/// <returns>A Launcher object.</returns>
private Launcher CreateLauncher(bool createBall)
{
// Create the launcher.
// We don't need a texture for unit tests, so pass in null for the texture parameters.
Launcher launcher = new Launcher(null, new Vector2(0, 0));
if (createBall) {
// Give the launcher a ball; otherwise, it won't move.
Ball ball = new Ball(null);
launcher.LoadBall(ball);
}
return launcher;
}