// If the screen is resized, the projection matrix will change
public void Update(GameTime gameTime)
{
Projection = Matrix.PerspectiveFovLH((float)Math.PI / 4.0f, (float)game.GraphicsDevice.BackBuffer.Width / game.GraphicsDevice.BackBuffer.Height, 0.1f, game.drawDistance());
int rotation = direction(Keys.E, Keys.Q);
float x_pos = 0;
float y_pos = 0;
if (!game.getCursorState())
{
x_pos = (game.mouseState.X - 0.5f);
y_pos = (game.mouseState.Y - 0.5f);
}
int time = gameTime.ElapsedGameTime.Milliseconds;
int forward = direction(Keys.W, Keys.S);
int sideways = direction(Keys.A, Keys.D);
Vector3 NormTP = Vector3.Normalize(target - position);
Vector3 NormTPxU = Vector3.Normalize(Vector3.Cross(target - position, up));
Vector3 NormU = Vector3.Normalize(up);
//moving forward and back
position += time * speed * forward * NormTP;
//Moving side to side
position += time * speed * sideways * NormTPxU;
//Moving the view target forward and back
target += time * speed * forward * NormTP;
//Moving the view target side to side
target += time * speed * sideways * NormTPxU;
//Moving the view target as we pitch
target -= rotation_speed * time * y_pos * NormU;
//Making sure the target stays one unit distance away from us
target = position + Vector3.Normalize(target - position);
//Moving the 'up' vector forwards and backwards as we pitch
up += rotation_speed * time * y_pos * Vector3.Normalize(target - position);
up.Normalize();
//Moving the 'up' vector side to side as we roll
up -= roll_speed * time * rotation * Vector3.Normalize(Vector3.Cross(target - position, up));
up.Normalize();
//Moving the view target as we yaw
target -= rotation_speed * time * x_pos * Vector3.Normalize(Vector3.Cross(target - position, up));
//Making sure the target stays one unit distance away from us
target = position + Vector3.Normalize(target - position);
//Setting the new view matrix if there's no collision and it's in bounds
Vector3 edge_bounding = game.edge_bounding(position);
if (!edge_bounding.Equals(position))
{
target -= position - edge_bounding;
position = edge_bounding;
}
float collide_height = game.terraincollide(position);
target.Y -= position.Y - Math.Max(position.Y, collide_height);
position.Y = Math.Max(position.Y, collide_height);
View = Matrix.LookAtLH(position, target, up);
}
