static public void Collide(ref Pickup pickup1, ref Pickup pickup2)
{
Vector2 tempVelocity1 = pickup1.Velocity;
Vector2 tempVelocity2 = pickup2.Velocity;
float magnitude = (pickup1.Velocity.Length() + pickup2.Velocity.Length()) / 2f;
if (tempVelocity1 == Vector2.Zero)
{
tempVelocity2.Normalize();
tempVelocity1 = tempVelocity2 = Vector2.Multiply(tempVelocity2, magnitude);
}
else if (tempVelocity2 == Vector2.Zero)
{
tempVelocity1.Normalize();
tempVelocity2 = tempVelocity1 = Vector2.Multiply(tempVelocity1, magnitude);
}
tempVelocity1.Normalize();
tempVelocity2.Normalize();
pickup1.Velocity = Vector2.Multiply(tempVelocity2, magnitude);
pickup2.Velocity = Vector2.Multiply(tempVelocity1, magnitude);
}
public void Update(GameTime gameTime, Rectangle playArea, ref MainPlayer player)
{
double deltaTime = gameTime.ElapsedGameTime.TotalSeconds;
ComboTimer -= (float)deltaTime;
if (ComboTimer <= 0)
{
ComboCount = 0;
}
Vector2 playerCenter = new Vector2(player.Position.X + player.Rectangle.Width / 2, player.Position.Y + player.Rectangle.Height / 2);
TimeToSpawn -= deltaTime;
if (TimeToSpawn <= 0 && Enemies.Count < 7)
{
float DifficultyModifier = 1f / (((float)EnemiesKilled * Difficulty) + 1f);
TimeToSpawn = (float)random.Next(875, 4376) * DifficultyModifier / 1000;
Pickup pickup;
bool isColliding = false;
int spawnAttempts = 0;
do
{
// Find whether the object will be spawned from above, the right, below, or the left
int start = random.Next(0, 2 * Pickup.PickupWidth() + 2 * Pickup.PickupHeight() + 1);
int x, y;
if (start < Pickup.PickupWidth())
{
y = -(Pickup.PickupHeight());
x = random.Next(-(Pickup.PickupWidth()), playArea.Width);
}
else if (start < Pickup.PickupWidth() + Pickup.PickupHeight())
{
x = playArea.Width;
y = random.Next(-(Pickup.PickupHeight()), playArea.Height);
}
else if (start < Pickup.PickupWidth() * 2 + Pickup.PickupHeight())
{
y = playArea.Height;
x = random.Next(-(Pickup.PickupWidth()), playArea.Width);
}
else
{
x = -(Pickup.PickupWidth());
y = random.Next(-(Pickup.PickupHeight()), playArea.Height);
}
Vector2 position = new Vector2(x, y);
//Vector2 direction = new Vector2((playArea.Width / 2) - (x + Pickup.PickupWidth() / 2), (playArea.Height / 2) - (y + Pickup.PickupHeight() / 2));
Vector2 direction = playerCenter - position;
pickup = new FollowPickup(position, direction, pikcups_Speed);
spawnAttempts++;
if (spawnAttempts >= 10)
{
break;
}
foreach (Pickup other in Enemies)
{
isColliding = false;
if (pickup.IsColliding(other))
{
isColliding = true;
break;
}
}
}while (isColliding);
Enemies.Add(pickup);
}
// Check enemy collisions. This is done the naive O(n^2) way. If given more time, something like
// an axis-aligned bounding box tree could be implemented.
int count = 0;
while (count < Enemies.Count)
{
// Delete enemies who are dead and have had their animation finish
if (Enemies[count].NeedsDeletion())
{
Enemies.RemoveAt(count);
continue;
}
// Update enemies
Enemies[count].Update(deltaTime, playerCenter);
Enemies[count].Update(gameTime);
// Remove the object if it has left the screen
if (Enemies[count].IsOutOfBounds(playArea))
{
Enemies.RemoveAt(count);
continue;
}
// Make enemies somewhat bounce off one another
for (int i = 0; i < Enemies.Count; i++)
{
if (Enemies[count].IsColliding(Enemies[i]))
{
Pickup temp1 = Enemies[count];
Pickup temp2 = Enemies[i];
Pickup.Collide(ref temp1, ref temp2);
Enemies[count] = temp1;
Enemies[i] = temp2;
}
}
// Kill the enemy or the player if the two collide
if (player.IsColliding(Enemies[count]))
{
if (player.Boosting)
{
HandleEnemyDestroyed(Enemies[count]);
Enemies[count].Kill();
EnemiesKilled++;
player.BoostMeter += 0.1f;
if (player.BoostMeter >= 1.2f)
{
player.BoostMeter = 1.2f;
}
player.allsounds[1].Play(volume: 0.3f, pitch: 0f, pan: 0f);
}
else
{
player.allsounds[3].Play(volume: 1f, pitch: 0f, pan: 0f);
IsGameOver = true;
}
}
// Kill the enemies if they hit any obstacles
//for (int i = 0; i < Obstacles.Count; i++)
//{
// if (Enemies[count].IsColliding(Obstacles[i]))
// {
// Enemies[count].Kill();
// break;
// }
//}
count++;
}
}
public bool IsOutOfBounds(Rectangle bounds)
{
return(Position.X < -(Pickup.PickupWidth() << 2) || Position.X > bounds.Width + Pickup.PickupWidth() ||
Position.Y < -(Pickup.PickupHeight() << 2) || Position.Y > bounds.Height + Pickup.PickupHeight());
}
