/// <summary>
/// Applies thrust to the ship in its current direction
/// </summary>
/// <param name="targetPosition"></param>
private void Thrust()
{
Vector2 shipFacing;
ParticleObject[] particleObjects;
ParticleObject particleObj;
// Calculate the vector towards which the ship is facing
shipFacing = new Vector2((float)Math.Sin(Angle), (float)-Math.Cos(Angle));
// Scale down and add to the velocity
_velocity += shipFacing / 10;
// Stop the ship from traveling too fast
if (_velocity.Length() > 25)
{
_velocity.Normalize();
_velocity *= 25;
}
// Add some particles for the thrust exhaust.
// First retrieve the particles from the game.
particleObjects = _game.GetParticleObjects(10);
// Loop for each object
for (int i = 0; i < particleObjects.Length; i++)
{
particleObj = particleObjects[i];
particleObj.ResetProperties(Position, _game.Textures["SmokeParticle"]);
// Set to the rear of the spaceship
particleObj.Position -= shipFacing * SpriteTexture.Width / 2 * ScaleX;
switch (GameHelper.RandomNext(3))
{
case 0: particleObj.SpriteColor = Color.White; break;
case 1: particleObj.SpriteColor = Color.Cyan; break;
case 2: particleObj.SpriteColor = Color.Blue; break;
}
particleObj.Scale = new Vector2(0.25f, 0.25f);
particleObj.IsActive = true;
particleObj.Intensity = 50;
particleObj.IntensityFadeAmount = 3 + GameHelper.RandomNext(1.5f);
particleObj.Speed = GameHelper.RandomNext(3.0f);
particleObj.Inertia = 0.9f + GameHelper.RandomNext(0.015f);
particleObj.Direction += -shipFacing * 5;
}
}
/// <summary>
/// The rock has been damaged so divide it or remove it from the game
/// </summary>
internal void DamageRock()
{
RockObject newRock;
ParticleObject[] particleObjects;
ParticleObject particleObj;
// Add some particles for the rock dust.
// First retrieve the particles from the game.
particleObjects = _game.GetParticleObjects(5);
// Loop for each object
for (int i = 0; i < particleObjects.Length; i++)
{
particleObj = particleObjects[i];
particleObj.ResetProperties(Position, _game.Textures["SmokeParticle"]);
switch (GameHelper.RandomNext(3))
{
case 0: particleObj.SpriteColor = Color.DarkGray; break;
case 1: particleObj.SpriteColor = Color.LightGray; break;
default: particleObj.SpriteColor = Color.White; break;
}
particleObj.Scale = new Vector2(0.4f, 0.4f);
particleObj.IsActive = true;
particleObj.Intensity = 255;
particleObj.IntensityFadeAmount = 3 + GameHelper.RandomNext(1.5f);
particleObj.Speed = GameHelper.RandomNext(3.0f);
particleObj.Inertia = 0.9f + GameHelper.RandomNext(0.015f);
}
// Is this a generation-zero rock?
// This is the smallest we get, so in this case the rock has actually been destroyed.
if (_generation == 0)
{
// Remove the rock from the game
_game.GameObjects.Remove(this);
}
else
{
// Re-initialize the rock at half its current size
InitializeRock(ScaleX * 0.7f);
// Decrease the generation value
_generation -= 1;
// Create another rock alongside this one
newRock = new RockObject(_game, SpriteTexture, _generation, ScaleX, _constructorSpeed);
// Position the new rock exactly on top of this rock
newRock.Position = Position;
// Add the new rock to the game
_game.GameObjects.Add(newRock);
}
}