//--------------------------------------------------------------------------------------------------
double _FindEdgeParam(TopoDS_Edge edge, SelectSubshapeAction selectAction)
{
// Calculate parameter on the edge
double umin = 0, umax = 0;
var curve = BRep_Tool.Curve(edge, ref umin, ref umax);
var viewAxis = selectAction.LastMouseEventData.PickAxis;
var extrema = new GeomAPI_ExtremaCurveCurve(curve, new Geom_Line(viewAxis));
if (extrema.NbExtrema() > 0)
{
double param1 = 0, param2 = 0;
extrema.LowerDistanceParameters(ref param1, ref param2);
return(param1);
}
else
{
return(Taper.CalculateBaseParameter(edge, 0.5));
}
}
//--------------------------------------------------------------------------------------------------
public SnapInfo Snap(MouseEventData mouseEvent)
{
if (!InteractiveContext.Current.EditorState.SnappingEnabled)
{
return(null);
}
SnapInfo info = null;
if (mouseEvent.DetectedShapes.Count == 1)
{
var detectedShape = mouseEvent.DetectedShapes[0];
if (SupportedSnapModes.HasFlag(SnapMode.Vertex) &&
InteractiveContext.Current.EditorState.SnapToVertexSelected &&
(detectedShape.ShapeType() == TopAbs_ShapeEnum.TopAbs_VERTEX))
{
// On Vertex
var vertex = TopoDS.Vertex(detectedShape);
info = new SnapInfo()
{
Point = BRep_Tool.Pnt(vertex),
SnapMode = SnapMode.Vertex
};
}
else if (SupportedSnapModes.HasFlag(SnapMode.Edge) &&
InteractiveContext.Current.EditorState.SnapToEdgeSelected &&
(detectedShape.ShapeType() == TopAbs_ShapeEnum.TopAbs_EDGE))
{
// On Edge
var edge = TopoDS.Edge(detectedShape);
double umin = 0, umax = 0;
var curve = BRep_Tool.Curve(edge, ref umin, ref umax);
if (curve != null)
{
var extrema = new GeomAPI_ExtremaCurveCurve(curve,
new Geom_Line(_WorkspaceController.ActiveViewport.ViewAxis(Convert.ToInt32(mouseEvent.ScreenPoint.X), Convert.ToInt32(mouseEvent.ScreenPoint.Y))));
if (extrema.NbExtrema() >= 1)
{
Pnt p1 = new Pnt();
Pnt p2 = new Pnt();
if (extrema.TotalNearestPoints(ref p1, ref p2))
{
info = new SnapInfo()
{
Point = p1,
SnapMode = SnapMode.Edge
};
}
}
}
}
}
else if (mouseEvent.DetectedAisInteractives.Count == 1)
{
if (SupportedSnapModes.HasFlag(SnapMode.Vertex) &&
InteractiveContext.Current.EditorState.SnapToVertexSelected &&
(mouseEvent.DetectedAisInteractives[0] is AIS_Point aisPoint))
{
// On Vertex
info = new SnapInfo()
{
Point = aisPoint.Component().Pnt(),
SnapMode = SnapMode.Vertex
};
}
}
else if (SupportedSnapModes.HasFlag(SnapMode.Grid) &&
InteractiveContext.Current.EditorState.SnapToGridSelected &&
_WorkspaceController.Workspace.V3dViewer.Grid().IsActive())
{
// On Grid
info = new SnapInfo()
{
Point = _WorkspaceController.ActiveViewport.ProjectToGrid(Convert.ToInt32(mouseEvent.ScreenPoint.X), Convert.ToInt32(mouseEvent.ScreenPoint.Y)),
SnapMode = SnapMode.Grid
};
}
if (info != null)
{
_WorkspaceController.CursorPosition = info.Point;
}
return(info);
}
