public void UpdateCamera(GameTime gameTime, KeyboardState keyboard, MouseState mouse)
{
//Find the three spatial directions
Vector3 forward = Vector3.Normalize(-CameraLocation);
Vector3 side = Vector3.Normalize(Vector3.Cross(forward, CameraUp));
CameraUp = Vector3.Normalize(Vector3.Cross(side, forward));
float panSpeed = 0.75f * CameraLocation.Length();
//The arrow pad rotates the screen
if (keyboard.IsKeyDown(Keys.Up))
{
CameraLocation = Vector3.Transform(CameraLocation
, Matrix.CreateFromAxisAngle(side, 0.75f * (float)gameTime.ElapsedGameTime.TotalSeconds));
}
if (keyboard.IsKeyDown(Keys.Down))
{
CameraLocation = Vector3.Transform(CameraLocation
, Matrix.CreateFromAxisAngle(side, -0.75f * (float)gameTime.ElapsedGameTime.TotalSeconds));
}
if (keyboard.IsKeyDown(Keys.Q))
{
CameraUp = Vector3.Transform(CameraUp
, Matrix.CreateFromAxisAngle(forward, -0.75f * (float)gameTime.ElapsedGameTime.TotalSeconds));
}
if (keyboard.IsKeyDown(Keys.E))
{
CameraUp = Vector3.Transform(CameraUp
, Matrix.CreateFromAxisAngle(forward, 0.75f * (float)gameTime.ElapsedGameTime.TotalSeconds));
}
float endLength = CameraLocation.Length();
endLength += (PreviousMouse.ScrollWheelValue - mouse.ScrollWheelValue)
* panSpeed / 8.0f * (float)gameTime.ElapsedGameTime.TotalSeconds;
//Page up/down and the mouse wheel controls zoom level
if (keyboard.IsKeyDown(Keys.PageUp))
{
endLength -= panSpeed * (float)gameTime.ElapsedGameTime.TotalSeconds;
}
if (keyboard.IsKeyDown(Keys.PageDown))
{
endLength += panSpeed * (float)gameTime.ElapsedGameTime.TotalSeconds;
}
CameraLocation =
Vector3.Normalize(CameraLocation)
* endLength;
if (endLength < 1.0f)
{
endLength = 1.0f;
}
Projection = Matrix.CreatePerspectiveFieldOfView(
MathHelper.PiOver4
, MyGame.graphics.GraphicsDevice.Viewport.AspectRatio
, endLength * 0.0005f
, 1000.0f + endLength * 25.0f);
//WASD controls panning
if (keyboard.IsKeyDown(Keys.Left))
{
CameraLocation = Vector3.Transform(CameraLocation
, Matrix.CreateFromAxisAngle(CameraUp, 0.75f * (float)gameTime.ElapsedGameTime.TotalSeconds));
}
if (keyboard.IsKeyDown(Keys.Right))
{
CameraLocation = Vector3.Transform(CameraLocation
, Matrix.CreateFromAxisAngle(CameraUp, -0.75f * (float)gameTime.ElapsedGameTime.TotalSeconds));
}
if (keyboard.IsKeyDown(Keys.W))
{
CameraFocus += forward * panSpeed * (float)gameTime.ElapsedGameTime.TotalSeconds;
FocalBody = null;
}
if (keyboard.IsKeyDown(Keys.S))
{
CameraFocus -= forward * panSpeed * (float)gameTime.ElapsedGameTime.TotalSeconds;
FocalBody = null;
}
if (keyboard.IsKeyDown(Keys.D))
{
CameraFocus += side * panSpeed * (float)gameTime.ElapsedGameTime.TotalSeconds;
FocalBody = null;
}
if (keyboard.IsKeyDown(Keys.A))
{
CameraFocus -= side * panSpeed * (float)gameTime.ElapsedGameTime.TotalSeconds;
FocalBody = null;
}
if (FocalBody != null)
{
FocalBodyFocusTimer -= gameTime.ElapsedGameTime.TotalSeconds;
if (FocalBodyFocusTimer < 0.0)
{
FocalBodyFocusTimer = 0.0;
}
CameraFocus = Vector3.Lerp(CameraFocus, FocalBody.Bounds.Center
, (float)Math.Pow(1.0 - FocalBodyFocusTimer, 1.5) + (float)gameTime.ElapsedGameTime.TotalSeconds);
}
//Recalculate the camera
View = Matrix.CreateLookAt(
CameraLocation + CameraFocus
, CameraFocus
, CameraUp);
}
public void Update(GameTime gameTime)
{
DebugText = "";
KeyboardState keyboard = Keyboard.GetState();
MouseState mouse = Mouse.GetState();
UpdateCamera(gameTime, keyboard, mouse);
cursor.Update();
//Update the _3DObjects
for (int i = 0; i < CelestialBodies.Count; i++)
{
CelestialBodies[i].Update(gameTime, Vector3.Zero, 0.0f);
if (CelestialBodies[i].isInactive)
{
CelestialBodies.RemoveAt(i--);
continue;
}
}
#region Mouse Processing
ContainingBodies.Clear();
VisibleBodies.Clear();
Ray ScreenCenter = Cursor.Unproject(new Vector2(GameWindow.Width, GameWindow.Height) / 2.0f);
BoundingFrustum VisibleArea = new BoundingFrustum(
View * Projection);
Body.PartiallySortBodies(ScreenCenter, VisibleArea, ref CelestialBodies, ref VisibleBodies, ref ContainingBodies);
for (int i = 0; i < VisibleBodies.Count; i++)
{
if (mouse.LeftButton == ButtonState.Pressed
&& PreviousMouse.LeftButton == ButtonState.Released)
{
float ButtonScale = 250.0f / (i + 10);
float DistanceToButtonCenter = (float)Math.Sqrt(Math.Pow(mouse.X - VisibleBodies[i].ScreenPosition.X, 2.0)
+ Math.Pow(mouse.Y - VisibleBodies[i].ScreenPosition.Y, 2.0));
if (DistanceToButtonCenter <= ButtonScale)
{
FocalBody = VisibleBodies[i];
FocalBodyFocusTimer = 1.0;
}
}
}
#endregion
PreviousKeyboard = keyboard;
PreviousMouse = mouse;
}