protected virtual void CheckBorders()
{
if (Position.X > Game1.Width)
{
Position = new Vector2(Game1.Width, Position.Y);
Velocity = Velocity.FlipX();
}
if (Position.X < 0)
{
Position = new Vector2(0, Position.Y);
Velocity = Velocity.FlipX();
}
if (Position.Y > Game1.Height)
{
Position = new Vector2(Position.X, Game1.Height);
Velocity = Velocity.FlipY();
}
if (Position.Y < 0)
{
Position = new Vector2(Position.X, 0);
Velocity = Velocity.FlipY();
}
}
private Vector2 Move(float time)
{
Vector2 newPosition = Position + _velocity.GetMovement() * time;
var boundingBox = new Rectangle(Point.Zero, _clientBounds.Size);
if (newPosition.X + _radius > boundingBox.Right)
{
float percentageBeforeCollide = (boundingBox.Right - _radius - Position.X) / (newPosition.X - Position.X);
if (percentageBeforeCollide < 0.99)
{
float timeBeforeCollide = percentageBeforeCollide * time;
Move(timeBeforeCollide);
time -= timeBeforeCollide;
}
_velocity.FlipX();
newPosition = Move(time);
}
else if (newPosition.X - _radius < 0)
{
float percentageBeforeCollide = (_radius - Position.X) / (newPosition.X - Position.X);
if (percentageBeforeCollide < 0.99)
{
float timeBeforeCollide = percentageBeforeCollide * time;
Move(timeBeforeCollide);
time -= timeBeforeCollide;
}
_velocity.FlipX();
newPosition = Move(time);
}
if (newPosition.Y + _radius > _clientBounds.Height)
{
float percentageBeforeCollide = (boundingBox.Bottom - _radius - Position.Y) / (newPosition.Y - Position.Y);
if (percentageBeforeCollide < 0.99)
{
float timeBeforeCollide = percentageBeforeCollide * time;
Move(timeBeforeCollide);
time -= timeBeforeCollide;
}
_velocity.FlipY();
newPosition = Move(time);
}
else if (newPosition.Y - _radius < 0)
{
float percentageBeforeCollide = (_radius - Position.Y) / (newPosition.Y - Position.Y);
if (percentageBeforeCollide < 0.99)
{
float timeBeforeCollide = percentageBeforeCollide * time;
Move(timeBeforeCollide);
time -= timeBeforeCollide;
}
_velocity.FlipY();
newPosition = Move(time);
}
return(newPosition);
}