/// <summary>
/// Gets the transform to viewport space.
/// </summary>
/// <param name="visual">
/// The visual.
/// </param>
/// <returns>
/// A transformation matrix.
/// </returns>
public static Matrix3D?GetViewportTransform(Visual3D visual)
{
var totalTransform = Matrix3D.Identity;
DependencyObject obj = visual;
while (obj != null)
{
var viewport3DVisual = obj as Viewport3DVisual;
if (viewport3DVisual != null)
{
var matxViewport = Viewport3DHelper.GetTotalTransform(viewport3DVisual);
totalTransform.Append(matxViewport);
return(totalTransform);
}
var mv = obj as ModelVisual3D;
if (mv != null)
{
if (mv.Transform != null)
{
totalTransform.Append(mv.Transform.Value);
}
}
obj = VisualTreeHelper.GetParent(obj);
}
return(null);
//throw new InvalidOperationException("The visual is not added to a Viewport3D.");
// At this point, we know obj is Viewport3DVisual
}
/// <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 ProjectionCamera camera, Viewport3D viewport, Rect zoomRectangle)
{
var topLeftRay = Viewport3DHelper.Point2DtoRay3D(viewport, zoomRectangle.TopLeft);
var topRightRay = Viewport3DHelper.Point2DtoRay3D(viewport, zoomRectangle.TopRight);
var centerRay = Viewport3DHelper.Point2DtoRay3D(
viewport,
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 = camera.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(camera, 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 = camera.Position + camera.LookDirection;
var distance = camera.LookDirection.Length;
Point3D newTarget;
if (centerRay.PlaneIntersection(oldTarget, w, out newTarget))
{
orthographicCamera.LookDirection = w * distance;
orthographicCamera.Position = newTarget - orthographicCamera.LookDirection;
}
}
}
/// <summary>
/// Get the ray into the view volume given by the position in 2D (screen coordinates)
/// </summary>
/// <param name="position">
/// A 2D point.
/// </param>
/// <returns>
/// A ray
/// </returns>
protected Ray3D GetRay(Point position)
{
Point3D point1, point2;
bool ok = Viewport3DHelper.Point2DtoPoint3D(this.Viewport, position, out point1, out point2);
if (!ok)
{
return null;
}
return new Ray3D { Origin = point1, Direction = point2 - point1 };
}
/// <summary>
/// The set mouse down point.
/// </summary>
/// <param name="position">
/// The position.
/// </param>
private void SetMouseDownPoint(Point position)
{
this.MouseDownPoint = position;
Point3D nearestPoint;
Vector3D normal;
DependencyObject visual;
if (Viewport3DHelper.FindNearest(
this.Controller.Viewport, this.MouseDownPoint, out nearestPoint, out normal, out visual))
{
this.MouseDownNearestPoint3D = nearestPoint;
}
else
{
this.MouseDownNearestPoint3D = null;
}
this.MouseDownPoint3D = this.UnProject(this.MouseDownPoint);
}
/// <summary>
/// Exports the specified viewport.
/// </summary>
/// <param name="viewport">
/// The viewport.
/// </param>
public void Export(Viewport3D viewport)
{
int m = this.OversamplingMultiplier;
var background = this.Background;
if (background == null)
{
background = Brushes.Transparent;
}
var bmp = Viewport3DHelper.RenderBitmap(viewport, background, m);
BitmapEncoder encoder;
string ext = Path.GetExtension(this.FileName);
switch (ext.ToLower())
{
case ".jpg":
var jpg = new JpegBitmapEncoder();
jpg.Frames.Add(BitmapFrame.Create(bmp));
encoder = jpg;
break;
case ".png":
var png = new PngBitmapEncoder();
png.Frames.Add(BitmapFrame.Create(bmp));
encoder = png;
break;
default:
throw new InvalidOperationException("Not supported file format.");
}
using (Stream stm = File.Create(this.FileName))
{
encoder.Save(stm);
}
}
/// <summary>
/// Projects the point on the hit plane.
/// </summary>
/// <param name="p">
/// The p.
/// </param>
/// <param name="hitPlaneOrigin">
/// The hit Plane Origin.
/// </param>
/// <param name="hitPlaneNormal">
/// The hit plane normal (world coordinate system).
/// </param>
/// <returns>
/// The point in world coordinates.
/// </returns>
protected virtual Point3D?GetHitPlanePoint(Point p, Point3D hitPlaneOrigin, Vector3D hitPlaneNormal)
{
return(Viewport3DHelper.UnProject(this.ParentViewport, p, hitPlaneOrigin, hitPlaneNormal));
}
/// <summary>
/// Calculate the screen position of a 3D point.
/// </summary>
/// <param name="p">
/// The 3D point.
/// </param>
/// <returns>
/// The 2D point.
/// </returns>
protected Point Project(Point3D p)
{
return(Viewport3DHelper.Point3DtoPoint2D(this.Viewport, p));
}
