/// <summary>
/// Make this camera look at a specific point in the world.
/// </summary>
/// <param name="position">The point to look at.</param>
public void LookAt(Vector3 position)
{
//store the line between the camera and the other IPoint3D, but only on the X/Z plane, then normalize it to get a unit vector.
OpenTK.Vector2 pitchVec = OpenTK.Vector2.Normalize(new OpenTK.Vector2(position.X - Position.X, position.Z - Position.Z));
//convert vector to angle and roatate the right axis to that angle
RotatePitchTo((float)(Math.Atan2(pitchVec.Y, pitchVec.X) * (180f / MathHelper.Pi) - 90));
//update lookAxis, the normalized vector of the line between this camera and the IPoint3D.
lookAxis = Vector3.Normalize(Vector3.Subtract(position, Position));
//update the heading variable and upAxis
RotateHeadingTo((float)Math.Asin(-lookAxis.Y) * (180f / MathHelper.Pi));
//update the view matrix so our changes are reflected in the world
RebuildView();
}
void control_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
{
long ms = movetime.ElapsedMilliseconds;
movetime.Reset();
movetime.Start();
if(MouseEnabled && _lastMouseEnabled && control.Focused)
{
float yaw = Rotation.X;
float pitch = Rotation.Y;
yaw += (e.X - MousePosition.X) * MouseSpeed * (float)ms;
pitch += (e.Y - MousePosition.Y) * MouseSpeed * (float)ms;
yaw = ((yaw % 360) + 360) % 360;
pitch = Math.Max(-90, Math.Min(90, pitch));
Cursor.Position = control.PointToScreen(MousePosition);
Rotation = new Vector2(yaw, pitch);
//Console.WriteLine("Camera's rotation is now {0}", Rotation);
} else if (MouseEnabled && !_lastMouseEnabled && control.Focused) {
Cursor.Position = control.PointToScreen(MousePosition);
Cursor.Hide();
_lastMouseEnabled = true;
} else {
Cursor.Show();
_lastMouseEnabled = false;
}
}