/// <summary>
/// Move a tank based on given tank and movement, if tank will collide with a wall, tank will not move
/// If tank goes out of the world, tank will be wrapped back into the world
/// </summary>
/// <param name="movement">movement command string, either "none", "left", "right", "up", or "down"</param>
private void HandleTankMovement(string movement, Tank tank)
{
if (movement != "none")
{
//Get the direction vector base on
Vector2D dir = GetDirection(movement, tank);
//Set tank's orientation base on the wasd
tank.Orientation = dir;
//Compute next frame location
Vector2D nextframelocation = tank.Location + dir * _tankspeed;
//If tank will not collide with wall and in world, the update the tank location based on current engine strength (tank speed) and given direction
if (!CollisionDetect.ObjectWallsCollision(tank, nextframelocation, theWorld) && InWorld(nextframelocation))
{
tank.Location = nextframelocation;
}
//Wrap around to the other side
if (!InWorld(nextframelocation))
{
//Horizontal direction
if (Math.Abs(nextframelocation.GetX()) > (theWorld.Size / 2))
{
tank.Location = new Vector2D(-nextframelocation.GetX(), nextframelocation.GetY());
}
//Vertical direction
if (Math.Abs(nextframelocation.GetY()) > (theWorld.Size / 2))
{
tank.Location = new Vector2D(nextframelocation.GetX(), -nextframelocation.GetY());
}
}
}
}
/// <summary>
/// Generate a random location for powerup that doesn't collides with any walls
/// </summary>
/// <returns>Vector2D location</returns>
private Vector2D GeneratePowerupLocation()
{
Random rng = new Random();
while (true)
{
Vector2D loc = new Vector2D(rng.Next(-theWorld.Size / 2, theWorld.Size / 2), rng.Next(-theWorld.Size / 2, theWorld.Size / 2));
//Make sure it doesn't collide with other walls
if (!CollisionDetect.ObjectWallsCollision(new Powerup(), loc, theWorld))
{
return(loc);
}
}
}
/// <summary>
/// Handle all logic relating to projectile and update the current projectile:
/// If projectile collides with a tank other than its owner, projectile will inflict damage on tank being hit and be marked as "died"
/// If projectile destroy another tank, projectile's owner will gain one point score, and setting dead tank in respawn state
/// If projectile collides with a wall or go out of the world, projectile will be marked as "died"
/// </summary>
/// <param name="proj"></param>
private void UpdateProjectile(Projectile proj)
{
//Check if projectile collides with any walls
bool projwallCollision = CollisionDetect.ObjectWallsCollision(proj, proj.Location, theWorld);
//Check if projectile collides with any tanks other than the owner
bool projothertankCollision = CollisionDetect.ProjOtherTanksCollision(proj, out Tank hitTank, theWorld);
//To check if projectile still in the world
bool projinWorld = InWorld(proj.Location);
//If proj didn't collide with any of tanks and walls and still in the world, projectile keep flying
if (!projwallCollision && !projothertankCollision && projinWorld)
{
//Update projectile location based on given proj speed
proj.Location += proj.Direction * _projspeed;
}
else if (projothertankCollision)
{
if (hitTank.HitPoints > 0)
{
//Do some damage to hitTank
hitTank.HitPoints--;
if (hitTank.HitPoints == 0)
{
//Mark it died
hitTank.Died = true;
//Enter respawn state
hitTank.FramesInRespawn = 0;
//Gain one score for proj's owner
theWorld.Tanks[proj.Owner].Score++;
}
}
}
if (projwallCollision || projothertankCollision || !projinWorld)
{
proj.Died = true;
//Remove it after sending
_diedprojectiles.Add(proj.ID);
}
}