public bool FindNearest(Point pt, out Point3D pos, out Vector3D normal, out DependencyObject obj)
{
return(Viewport3DHelper.FindNearest(Viewport, pt, out pos, out normal, out obj));
}
private void MouseDownHandler(object sender, MouseButtonEventArgs e)
{
if (!Enabled)
{
return;
}
if (Viewport == null)
{
throw new NullReferenceException("Viewport");
}
var element = (UIElement)sender;
if (element.IsMouseCaptured)
{
return;
}
mouseDownPosition = e.GetPosition(this);
fixRelative = new Vector3D();
// reset camera
if (CheckButton(e, MouseAction.ResetCamera))
{
ResetCamera();
}
Point3D point;
Vector3D normal;
DependencyObject visual;
if (Viewport3DHelper.FindNearest(Viewport, mouseDownPosition, out point, out normal, out visual))
{
mouseDownPoint3D = point;
}
else
{
mouseDownPoint3D = null;
}
lastPoint3D = UnProject(mouseDownPosition, CameraTarget, LookDirection);
// select object
if (CheckButton(e, MouseAction.Select) && visual != null)
{
OnSelectionChanged(visual);
}
zooming = CheckButton(e, MouseAction.Zoom);
panning = CheckButton(e, MouseAction.Pan);
rotating = CheckButton(e, MouseAction.Rotate);
isFixed = false;
// change the 'lookat' point
if (mouseDownPoint3D != null && CheckButton(e, MouseAction.ChangeLookAt))
{
LookAt(mouseDownPoint3D.Value, 0);
rotating = true;
}
if (zooming || panning || rotating)
{
bool rightWinKey = (Keyboard.IsKeyDown(Key.RWin));
if (FixedMouseDownPoint || rightWinKey)
{
if (!panning && mouseDownPoint3D != null)
{
fixRelative = mouseDownPoint3D.Value - CameraTarget;
ShowTargetAdorner(mouseDownPosition);
isFixed = true;
}
}
else
{
// show the adorner in the middle
ShowTargetAdorner(new Point(Viewport.ActualWidth / 2, Viewport.ActualHeight / 2));
}
/*
* Position += _fixRelative;
* ShowTargetModel();
* Position -= _fixRelative;
*/
if (zooming || panning || rotating)
{
e.Handled = true;
element.CaptureMouse();
}
spinWatch.Reset();
spinWatch.Start();
// ProjectToTrackball(EventSurface.ActualWidth, EventSurface.ActualHeight, _mouseDownPosition);
lastPosition = mouseDownPosition;
}
isSpinning = false;
}
