public void SwitchTarget(Vector2 targetPosition, GameTime t)
{
if (CurrentCameraTrajectory == null)
{
CurrentCameraTrajectory = new CameraTrajectory(CurrentPosition, targetPosition, t);
}
}
public void Update(GameTime t)
{
if (Zoom != ZoomTarget)
{
float zoomDirection = Math.Sign(ZoomTarget - Zoom);
Zoom += zoomDirection * ZoomPerSecond * (float)t.ElapsedGameTime.TotalSeconds;
if ((zoomDirection < 0 && Zoom < ZoomTarget) || (zoomDirection > 0 && Zoom > ZoomTarget))
{
Zoom = ZoomTarget;
}
}
if (CurrentCameraTrajectory != null)
{
if (CurrentCameraTrajectory.IsValid() == false)
{
CurrentCameraTrajectory = null;
return;
}
Vector3 p = CurrentCameraTrajectory.GetCurrentPoint(t);
CurrentPosition.X = p.X;
CurrentPosition.Y = p.Y;
float dynamicZoom = p.Z;
float x_size = 40.0f / dynamicZoom;
float y_size = 40.0f / dynamicZoom / AspectRatio;
var left = p.X - x_size / 2.0f;
var right = p.X + x_size / 2.0f;
var bottom = p.Y - y_size / 2.0f;
var top = p.Y + y_size / 2.0f;
ClampToBoundary(ref top, ref right, ref bottom, ref left);
// Clamp view frustum to boundary
SetView(Matrix.CreateOrthographicOffCenter(
left, right,
bottom, top,
-20, 20));
}
else
{
Vector2 DiffPos = TargetPosition - CurrentPosition;
double DiffTime = (t.TotalGameTime.TotalMilliseconds - lastMillis) / 1000.0;
lastMillis = t.TotalGameTime.TotalMilliseconds;
if (DiffPos.Length() > 0f)
{
float speed = 3.0f + DiffPos.Length() * 1.0f;
Vector2 delta = Vector2.Normalize(DiffPos) * speed * (float)DiffTime;
if (delta.Length() > DiffPos.Length())
{
CurrentPosition = TargetPosition;
}
else
{
CurrentPosition += delta;
}
}
float dynamicZoom = Zoom - DiffPos.Length() * 0.01f;
float x_size = 40.0f / dynamicZoom;
float y_size = 40.0f / dynamicZoom / AspectRatio;
var left = CurrentPosition.X - x_size / 2.0f;
var right = CurrentPosition.X + x_size / 2.0f;
var bottom = CurrentPosition.Y - y_size / 2.0f;
var top = CurrentPosition.Y + y_size / 2.0f;
ClampToBoundary(ref top, ref right, ref bottom, ref left);
SetView(Matrix.CreateOrthographicOffCenter(
left, right,
bottom, top,
-20, 20));
}
}