/// <summary>
/// Zooms the camera to the specified rectangle.
/// </summary>
/// <param name="camera">
/// The camera.
/// </param>
/// <param name="viewport">
/// The viewport.
/// </param>
/// <param name="zoomRectangle">
/// The zoom rectangle.
/// </param>
public static void ZoomToRectangle(this Camera camera, Viewport3DX viewport, Rect zoomRectangle)
{
var topLeftRay = viewport.UnProjectToRay(zoomRectangle.TopLeft);
var topRightRay = viewport.UnProjectToRay(zoomRectangle.TopRight);
var centerRay =
viewport.UnProjectToRay(
new Point(
(zoomRectangle.Left + zoomRectangle.Right) * 0.5,
(zoomRectangle.Top + zoomRectangle.Bottom) * 0.5));
if (topLeftRay == null || topRightRay == null || centerRay == null)
{
// could not invert camera matrix
return;
}
var u = Vector3.Normalize(topLeftRay.Direction);
var v = Vector3.Normalize(topRightRay.Direction);
var w = Vector3.Normalize(centerRay.Direction);
if (camera is IPerspectiveCameraModel perspectiveCamera)
{
var distance = camera.LookDirection.Length;
// option 1: change distance
var newDistance = distance * zoomRectangle.Width / viewport.ActualWidth;
var newLookDirection = (float)newDistance * w;
var newPosition = camera.CameraInternal.Position + ((float)(distance - newDistance) * w);
var newTarget = newPosition + newLookDirection;
LookAt(camera, newTarget.ToPoint3D(), newLookDirection.ToVector3D(), 200);
// option 2: change fov
// double newFieldOfView = Math.Acos(Vector3D.DotProduct(u, v));
// var newTarget = camera.Position + distance * w;
// pcamera.FieldOfView = newFieldOfView * 180 / Math.PI;
// LookAt(camera, newTarget, distance * w, 0);
}
else if (camera is IOrthographicCameraModel orthographicCamera)
{
orthographicCamera.Width *= zoomRectangle.Width / viewport.ActualWidth;
var oldTarget = camera.CameraInternal.Position + camera.CameraInternal.LookDirection;
var distance = camera.CameraInternal.LookDirection.Length();
var newTarget = centerRay.PlaneIntersection(oldTarget, w);
if (newTarget != null)
{
LookAt(orthographicCamera, newTarget.Value.ToPoint3D(), 200);
}
}
}
/// <summary>
/// Zooms the camera to the specified rectangle.
/// </summary>
/// <param name="camera">
/// The camera.
/// </param>
/// <param name="viewport">
/// The viewport.
/// </param>
/// <param name="zoomRectangle">
/// The zoom rectangle.
/// </param>
public static void ZoomToRectangle(this Camera camera, Viewport3DX viewport, Rect zoomRectangle)
{
var pcam = camera as ProjectionCamera;
if (pcam == null)
{
return;
}
var topLeftRay = viewport.UnProjectToRay(zoomRectangle.TopLeft);
var topRightRay = viewport.UnProjectToRay(zoomRectangle.TopRight);
var centerRay =
viewport.UnProjectToRay(
new Point(
(zoomRectangle.Left + zoomRectangle.Right) * 0.5,
(zoomRectangle.Top + zoomRectangle.Bottom) * 0.5));
if (topLeftRay == null || topRightRay == null || centerRay == null)
{
// could not invert camera matrix
return;
}
var u = topLeftRay.Direction;
var v = topRightRay.Direction;
var w = centerRay.Direction;
u.Normalize();
v.Normalize();
w.Normalize();
var perspectiveCamera = camera as PerspectiveCamera;
if (perspectiveCamera != null)
{
var distance = pcam.LookDirection.Length;
// option 1: change distance
var newDistance = distance * zoomRectangle.Width / viewport.ActualWidth;
var newLookDirection = newDistance * w;
var newPosition = perspectiveCamera.Position + ((distance - newDistance) * w);
var newTarget = newPosition + newLookDirection;
LookAt(pcam, newTarget, newLookDirection, 200);
// option 2: change fov
// double newFieldOfView = Math.Acos(Vector3D.DotProduct(u, v));
// var newTarget = camera.Position + distance * w;
// pcamera.FieldOfView = newFieldOfView * 180 / Math.PI;
// LookAt(camera, newTarget, distance * w, 0);
}
var orthographicCamera = camera as OrthographicCamera;
if (orthographicCamera != null)
{
orthographicCamera.Width *= zoomRectangle.Width / viewport.ActualWidth;
var oldTarget = pcam.Position + pcam.LookDirection;
var distance = pcam.LookDirection.Length;
var newTarget = centerRay.PlaneIntersection(oldTarget, w);
if (newTarget != null)
{
orthographicCamera.LookDirection = w * distance;
orthographicCamera.Position = newTarget.Value - orthographicCamera.LookDirection;
}
}
}
/// <summary>
/// Zooms the camera to the specified rectangle.
/// </summary>
/// <param name="camera">
/// The camera.
/// </param>
/// <param name="viewport">
/// The viewport.
/// </param>
/// <param name="zoomRectangle">
/// The zoom rectangle.
/// </param>
public static void ZoomToRectangle(this Camera camera, Viewport3DX viewport, Rect zoomRectangle)
{
var pcam = camera as ProjectionCamera;
if (pcam == null)
{
return;
}
var topLeftRay = viewport.UnProjectToRay(zoomRectangle.TopLeft);
var topRightRay = viewport.UnProjectToRay(zoomRectangle.TopRight);
var centerRay =
viewport.UnProjectToRay(
new Point(
(zoomRectangle.Left + zoomRectangle.Right) * 0.5,
(zoomRectangle.Top + zoomRectangle.Bottom) * 0.5));
if (topLeftRay == null || topRightRay == null || centerRay == null)
{
// could not invert camera matrix
return;
}
var u = topLeftRay.Direction;
var v = topRightRay.Direction;
var w = centerRay.Direction;
u.Normalize();
v.Normalize();
w.Normalize();
var perspectiveCamera = camera as PerspectiveCamera;
if (perspectiveCamera != null)
{
var distance = pcam.LookDirection.Length;
// option 1: change distance
var newDistance = distance * zoomRectangle.Width / viewport.ActualWidth;
var newLookDirection = newDistance * w;
var newPosition = perspectiveCamera.Position + ((distance - newDistance) * w);
var newTarget = newPosition + newLookDirection;
LookAt(pcam, newTarget, newLookDirection, 200);
// option 2: change fov
// double newFieldOfView = Math.Acos(Vector3D.DotProduct(u, v));
// var newTarget = camera.Position + distance * w;
// pcamera.FieldOfView = newFieldOfView * 180 / Math.PI;
// LookAt(camera, newTarget, distance * w, 0);
}
var orthographicCamera = camera as OrthographicCamera;
if (orthographicCamera != null)
{
orthographicCamera.Width *= zoomRectangle.Width / viewport.ActualWidth;
var oldTarget = pcam.Position + pcam.LookDirection;
var distance = pcam.LookDirection.Length;
var newTarget = centerRay.PlaneIntersection(oldTarget, w);
if (newTarget != null)
{
orthographicCamera.LookDirection = w * distance;
orthographicCamera.Position = newTarget.Value - orthographicCamera.LookDirection;
}
}
}
