public Shell(Game game, Vector3 p_velocity, Vector3 p_cannonEnd, Tank p_owner)
: base(game)
{
tankGame = game;
velocity = p_velocity;
location = p_cannonEnd;
cannonEnd = p_cannonEnd;
time = 0;
gravity = 980.0665f;
radius = 15;
owner = p_owner;
camera = (GameServices.CameraState)Game.Services.GetService(
typeof(GameServices.CameraState));
audio = (GameServices.AudioLibrary)Game.Services.GetService(
typeof(GameServices.AudioLibrary));
}
/// <summary>
/// Check tank on tank collision
/// Seeing as the tanks cannot travel vertically, all these calculations are in 2D
/// </summary>
/// <param name="tank">other tank</param>
bool CheckTankCollision(Tank tank)
{
// First checks to see if this tank is within 921 units from the other tank (920.2 units is the furthest collision possible)
if (Vector3.Distance(tank.Location,tankLocation) < 921 && tank != this)
{
//relative location and rotation
float rot = tank.Rotation-totalRotation;
//Calculate other tanks location relative to this tank
Vector2 loc = new Vector2((tank.Location.X - tankLocation.X) * (float)Math.Cos(totalRotation) - (tank.Location.Z - tankLocation.Z) * (float)Math.Sin(totalRotation),
(tank.Location.X - tankLocation.X) * (float)Math.Sin(totalRotation) + (tank.Location.Z - tankLocation.Z) * (float)Math.Cos(totalRotation));
//Calculate other tanks corners relative to this tank
Vector2 topLeft = new Vector2(loc.X + tankSize.X * (float)Math.Cos(rot) + tankSize.Z *(float)Math.Sin(rot),
loc.Y + tankSize.Z * (float)Math.Cos(rot) - tankSize.X *(float)Math.Sin(rot));
Vector2 topRight = new Vector2(loc.X - tankSize.X * (float)Math.Cos(rot) + tankSize.Z * (float)Math.Sin(rot),
loc.Y + tankSize.Z * (float)Math.Cos(rot) + tankSize.X *(float)Math.Sin(rot));
Vector2 botLeft = new Vector2(loc.X + tankSize.X * (float)Math.Cos(rot) - tankSize.Z * (float)Math.Sin(rot),
loc.Y - tankSize.Z * (float)Math.Cos(rot) - tankSize.X *(float)Math.Sin(rot));
Vector2 botRight = new Vector2(loc.X - tankSize.X * (float)Math.Cos(rot) - tankSize.Z * (float)Math.Sin(rot),
loc.Y - tankSize.Z * (float)Math.Cos(rot) + tankSize.X *(float)Math.Sin(rot));
Vector2 hitBox = new Vector2(tankSize.X, tankSize.Z);
//Check to see if other tanks corners are in this tank
if(InsideRectangle(topLeft,hitBox)||
InsideRectangle(topRight,hitBox)||
InsideRectangle(botLeft,hitBox) ||
InsideRectangle(botRight,hitBox))
return true;
//Checks to see if this tanks corners are in the other tank
else if(InsideTriangle(topLeft, topRight, botLeft, hitBox)||
InsideTriangle(topLeft, topRight, botLeft, new Vector2(-hitBox.X, hitBox.Y))||
InsideTriangle(topLeft, topRight, botLeft, new Vector2(hitBox.X, -hitBox.Y))||
InsideTriangle(topLeft, topRight, botLeft, new Vector2(-hitBox.X, -hitBox.Y))||
InsideTriangle(botRight, topRight, botLeft, hitBox)||
InsideTriangle(botRight, topRight, botLeft, new Vector2(-hitBox.X, hitBox.Y))||
InsideTriangle(botRight, topRight, botLeft, new Vector2(hitBox.X, -hitBox.Y))||
InsideTriangle(botRight, topRight, botLeft, new Vector2(-hitBox.X, -hitBox.Y)))
return true;
}
return false;
}
/// <summary>
/// Check shell on tank collision it is assumed the shell is low enough to hit the tank.
/// This only gets checked if the shells edge is below the height of the Tank, thus all calculations are in 2D
/// </summary>
/// <param name="tank">Tank</param>
bool CheckTankCollision(Tank tank)
{
// First checks to see if this shell is within 596 units from the tank (595.4 units is the furthest collision possible)
if (Vector3.Distance(tank.Location, location) < 596 && tank != owner)
{
//relative location and rotation
float rot = tank.Rotation;
//Calculate shells location relative to the tank
Vector3 loc = new Vector3( (location.X - tank.Location.X) * (float)Math.Cos(rot) - (location.Z - tank.Location.Z) * (float)Math.Sin(rot),
location.Y,
(location.X - tank.Location.X) * (float)Math.Sin(rot) + (location.Z - tank.Location.Z) * (float)Math.Cos(rot));
Vector3 vel = new Vector3(velocity.X * (float)Math.Cos(rot) - velocity.Z * (float)Math.Sin(rot),
velocity.Y,
velocity.X * (float)Math.Sin(rot) + velocity.Z * (float)Math.Cos(rot));
//Create an enlarged hitbox based on the shell's radius
Vector3 hitBox = new Vector3(tank.Size.X + radius, tank.Size.Y + radius, tank.Size.Z + radius);
//Check to see if the shell passes through the tanks hitbox
if (CheckHitBoxCollision(hitBox, vel, loc))
{
tank.Health -= 1;
if (tank.Health <= 0)
tankGame.Components.Remove(tank);
return true;
}
}
return false;
}
/// <summary>
/// Allows the game to perform any initialization it needs to before starting to run.
/// This is where it can query for any required services and load any non-graphic
/// related content. Calling base.Initialize will enumerate through any components
/// and initialize them as well.
/// </summary>
protected override void Initialize()
{
//Initialize Input
input = new GameServices.InputState();
input.Update();
Services.AddService(typeof(GameServices.InputState), input);
//create camera
camera = new GameServices.CameraState(
MathHelper.PiOver4,
(float)graphics.GraphicsDevice.Viewport.Width / (float)graphics.GraphicsDevice.Viewport.Height,
1.0f,
100000.0f);
Services.AddService(typeof(GameServices.CameraState), camera);
//create audip
audio = new GameServices.AudioLibrary();
audio.InitializeAudio();
Services.AddService(typeof(GameServices.AudioLibrary), audio);
//create tanks
playerTank = new Objects.Tank(this, new Vector3(0, 0, 0));
playerTank.Health = 10;
playerTank.AI = false;
Components.Add(playerTank);
//buildings
buildings = new List<List<Objects.Building>>();
List<Objects.Building> listception = new List<Objects.Building>();
Objects.Building build;
for (int i = 1; i <= worldsize.Y / 3000; i++)
{
for (int j = 1; j <= worldsize.X / 3000; j++)
{
build = new Objects.Building(this, new Vector3(i * 3000 + 435 - worldsize.Y / 2, 0, j * 3000 + 435 - worldsize.X / 2));
build.Enabled = false;
Components.Add(build);
}
}
Random x = new Random();
int n = x.Next(5, 50);
Objects.Tank tank;
for (int i = 0; i < n; i++)
{
do
tank = new Objects.Tank(this, new Vector3(x.Next(-15, 16) * 3000, 0, x.Next(-15, 16) * 3000));
while (tank.CollisionDetection());
Components.Add(tank);
}
camera.Update(playerTank.Location, playerTank.TurretRotation);
GenerateGround(worldsize.X, worldsize.Y);
base.Initialize();
}
