private void ApplyViewOrientationAndVisibility(UIDocument uiDocument, View3D view, Camera camera)
{
using var trans = new Transaction(uiDocument.Document);
if (trans.Start($"Apply view orientation and visibility in '{view.Name}'") != TransactionStatus.Started)
{
return;
}
StatusBarService.SetStatusText("Loading view point data ...");
Log.Information("Calculating view orientation from camera position ...");
ProjectPosition projectPosition = uiDocument.Document.ActiveProjectLocation.GetProjectPosition(XYZ.Zero);
var viewOrientation3D = RevitUtils.TransformCameraPosition(
new ProjectPositionWrapper(projectPosition),
camera.Position.ToInternalUnits(),
true)
.ToViewOrientation3D();
if (camera.Type == CameraType.Perspective)
{
Log.Information("Setting active far viewer bound to zero ...");
Parameter farClip = view.get_Parameter(BuiltInParameter.VIEWER_BOUND_ACTIVE_FAR);
if (farClip.HasValue)
{
farClip.Set(0);
}
}
Log.Information("Applying new view orientation ...");
view.SetOrientation(viewOrientation3D);
Log.Information("Applying element visibility ...");
var currentlyVisibleElements = uiDocument.Document.GetVisibleElementsOfView(view);
var map = uiDocument.Document.GetIfcGuidElementIdMap(currentlyVisibleElements);
var exceptionElements = GetViewpointVisibilityExceptions(map);
var selectedElements = GetViewpointSelection(map);
if (exceptionElements.Any())
{
if (_bcfViewpoint.GetVisibilityDefault())
{
view.HideElementsTemporary(exceptionElements);
selectedElements = selectedElements.Where(id => !exceptionElements.Contains(id)).ToList();
}
else
{
view.IsolateElementsTemporary(exceptionElements);
selectedElements = selectedElements.Where(id => exceptionElements.Contains(id)).ToList();
}
}
view.ConvertTemporaryHideIsolateToPermanent();
if (selectedElements.Any())
{
Log.Information("Select {n} elements ...", selectedElements.Count);
uiDocument.Selection.SetElementIds(selectedElements);
}
trans.Commit();
}
/// <summary>
/// Zoom the view to the correct scale, if necessary.
/// </summary>
/// <remarks>In Revit, orthogonal views do not change their camera positions, when zooming in or out. Hence,
/// the values stored in the BCF viewpoint are not sufficient to restore the previously exported viewpoint.
/// In order to get correct zooming, the scale value (view box height) is used, to calculate the correct zoom
/// corners according to view center.
/// See https://thebuildingcoder.typepad.com/blog/2020/10/save-and-restore-3d-view-camera-settings.html
/// </remarks>
private static void ZoomIfNeeded(UIApplication app, Camera camera, ElementId viewId)
{
if (camera.Type != CameraType.Orthogonal || camera is not OrthogonalCamera orthoCam)
{
return;
}
Log.Information("Found orthogonal camera, setting zoom callback ...");
StatusBarService.SetStatusText("Waiting for view to render to apply zoom ...");
AppIdlingCallbackListener.SetPendingZoomChangedCallback(app, viewId, orthoCam.ViewToWorldScale);
}
/// <summary>
/// Sets a callback that applies a zoom to the current view.
/// </summary>
/// <param name="app">The current UI application.</param>
/// <param name="viewId">The view ID for the view to be zoomed.</param>
/// <param name="zoom">The zoom in decimal precision.</param>
public static void SetPendingZoomChangedCallback(UIApplication app, ElementId viewId, decimal zoom)
{
void Callback(object sender, IdlingEventArgs args)
{
StatusBarService.SetStatusText("Zooming to scale '" + zoom + "' ...");
UIView currentView = app.ActiveUIDocument.GetOpenUIViews().First();
if (currentView.ViewId != viewId)
{
return;
}
UIDocument uiDoc = app.ActiveUIDocument;
View activeView = uiDoc.ActiveView;
var zoomCorners = currentView.GetZoomCorners();
XYZ bottomLeft = zoomCorners[0];
XYZ topRight = zoomCorners[1];
var(currentHeight, currentWidth) =
RevitUtils.ConvertToViewBoxValues(topRight, bottomLeft, activeView.RightDirection);
var zoomedViewBoxHeight = Convert.ToDouble(zoom).ToInternalRevitUnit();
var zoomedViewBoxWidth = zoomedViewBoxHeight * currentWidth / currentHeight;
XYZ newTopRight = activeView.Origin
.Add(activeView.UpDirection.Multiply(zoomedViewBoxHeight / 2))
.Add(activeView.RightDirection.Multiply(zoomedViewBoxWidth / 2));
XYZ newBottomLeft = activeView.Origin
.Subtract(activeView.UpDirection.Multiply(zoomedViewBoxHeight / 2))
.Subtract(activeView.RightDirection.Multiply(zoomedViewBoxWidth / 2));
Log.Information("Zoom to {topRight} | {bottomLeft} ...", newTopRight.ToString(), newBottomLeft.ToString());
currentView.ZoomAndCenterRectangle(newTopRight, newBottomLeft);
StatusBarService.ResetStatusBarText();
Log.Information("Finished applying zoom for orthogonal view.");
app.Idling -= Callback;
}
Log.Information("Append zoom callback for orthogonal view to idle state of Revit application ...");
app.Idling += Callback;
}