OCCT

// Created on: 1998-11-12
// Created by: Robert COUBLANC
// Copyright (c) 1998-1999 Matra Datavision
// Copyright (c) 1999-2014 OPEN CASCADE SAS
//
// This file is part of Open CASCADE Technology software library.
//
// This library is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License version 2.1 as published
// by the Free Software Foundation, with special exception defined in the file
// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
// distribution for complete text of the license and disclaimer of any warranty.
//
// Alternatively, this file may be used under the terms of Open CASCADE
// commercial license or contractual agreement.

#include <ViewerTest.hxx>

#include <AIS_Circle.hxx>
#include <AIS_InteractiveContext.hxx>
#include <AIS_Point.hxx>
#include <AIS_Shape.hxx>
#include <PrsDim_AngleDimension.hxx>
#include <PrsDim_ConcentricRelation.hxx>
#include <PrsDim_DiameterDimension.hxx>
#include <PrsDim_EqualDistanceRelation.hxx>
#include <PrsDim_EqualRadiusRelation.hxx>
#include <PrsDim_FixRelation.hxx>
#include <PrsDim_IdenticRelation.hxx>
#include <PrsDim_KindOfRelation.hxx>
#include <PrsDim_LengthDimension.hxx>
#include <PrsDim_OffsetDimension.hxx>
#include <PrsDim_ParallelRelation.hxx>
#include <PrsDim_PerpendicularRelation.hxx>
#include <PrsDim_RadiusDimension.hxx>
#include <PrsDim_Relation.hxx>
#include <PrsDim_SymmetricRelation.hxx>
#include <PrsDim_TangentRelation.hxx>
#include <BRep_Builder.hxx>
#include <BRep_Tool.hxx>
#include <BRepExtrema_ExtCC.hxx>
#include <BRepExtrema_ExtCF.hxx>
#include <BRepExtrema_ExtPF.hxx>
#include <BRepExtrema_ExtFF.hxx>
#include <BRepTools.hxx>
#include <Draw_Interpretor.hxx>
#include <Draw_Appli.hxx>
#include <Draw_Window.hxx>
#include <DBRep.hxx>
#include <ElSLib.hxx>
#include <Font_FontMgr.hxx>
#include <GC_MakePlane.hxx>
#include <Geom_CartesianPoint.hxx>
#include <Geom_Circle.hxx>
#include <Geom_Line.hxx>
#include <Geom_Plane.hxx>
#include <GeomAPI_IntCS.hxx>
#include <gce_MakeLin.hxx>
#include <gce_MakePln.hxx>
#include <gp_Circ.hxx>
#include <gp_Pln.hxx>
#include <IntAna_IntConicQuad.hxx>
#include <IntAna_Quadric.hxx>
#include <Message.hxx>
#include <Precision.hxx>
#include <TCollection_AsciiString.hxx>
#include <TCollection_ExtendedString.hxx>
#include <NCollection_Sequence.hxx>
#include <TopAbs_ShapeEnum.hxx>
#include <TopExp.hxx>
#include <TopExp_Explorer.hxx>
#include <TopoDS.hxx>
#include <TopoDS_Face.hxx>
#include <TopoDS_Vertex.hxx>
#include <V3d_View.hxx>
#include <Standard_Transient.hxx>
#include <NCollection_DoubleMap.hxx>
class AIS_InteractiveObject;

extern bool VDisplayAISObject(const TCollection_AsciiString&            theName,
                              const occ::handle<AIS_InteractiveObject>& theAISObj,
                              bool                                      theReplaceIfExists = true);
extern NCollection_DoubleMap<occ::handle<AIS_InteractiveObject>, TCollection_AsciiString>&
                                            GetMapOfAIS();
extern int                                  ViewerMainLoop(int argc, const char** argv);
extern occ::handle<AIS_InteractiveContext>& TheAISContext();

#define VertexMask 0x01
#define EdgeMask 0x02
#define FaceMask 0x04

//=======================================================================
// function : Get3DPointAtMousePosition
// purpose  : Calculates the 3D points corresponding to the mouse position
//           in the plane of the view
//=======================================================================
static gp_Pnt Get3DPointAtMousePosition()
{
  occ::handle<V3d_View> aView = ViewerTest::CurrentView();

  double xv, yv, zv;
  aView->Proj(xv, yv, zv);
  double xat, yat, zat;
  aView->At(xat, yat, zat);
  gp_Pln aPlane(gp_Pnt(xat, yat, zat), gp_Dir(xv, yv, zv));

  int    aPixX, aPixY;
  double aX, aY, aZ, aDX, aDY, aDZ;

  ViewerTest::GetMousePosition(aPixX, aPixY);
  aView->ConvertWithProj(aPixX, aPixY, aX, aY, aZ, aDX, aDY, aDZ);
  gp_Lin aLine(gp_Pnt(aX, aY, aZ), gp_Dir(aDX, aDY, aDZ));

  // Compute intersection
  occ::handle<Geom_Line>  aGeomLine  = new Geom_Line(aLine);
  occ::handle<Geom_Plane> aGeomPlane = new Geom_Plane(aPlane);
  GeomAPI_IntCS           anIntersector(aGeomLine, aGeomPlane);
  if (!anIntersector.IsDone() || anIntersector.NbPoints() == 0)
  {
    return gp::Origin();
  }
  return anIntersector.Point(1);
}

//=======================================================================
// function : Get3DPointAtMousePosition
// purpose  : Calculates the 3D points corresponding to the mouse position
//           in the plane of the view
//=======================================================================
static bool Get3DPointAtMousePosition(const gp_Pnt& theFirstPoint,
                                      const gp_Pnt& theSecondPoint,
                                      gp_Pnt&       theOutputPoint)
{
  theOutputPoint = gp::Origin();

  occ::handle<V3d_View> aView = ViewerTest::CurrentView();

  int    aPixX, aPixY;
  double aX, aY, aZ, aDx, aDy, aDz, aUx, aUy, aUz;

  // Get 3D point in view coordinates and projection vector from the pixel point.
  ViewerTest::GetMousePosition(aPixX, aPixY);
  aView->ConvertWithProj(aPixX, aPixY, aX, aY, aZ, aDx, aDy, aDz);
  gp_Lin aProjLin(gp_Pnt(aX, aY, aZ), gp_Dir(aDx, aDy, aDz));

  // Get plane
  gp_Vec aDimVec(theFirstPoint, theSecondPoint);
  aView->Up(aUx, aUy, aUz);
  gp_Vec aViewUp(aUx, aUy, aUz);

  if (aDimVec.IsParallel(aViewUp, Precision::Angular()))
  {
    theOutputPoint = Get3DPointAtMousePosition();
    return true;
  }

  gp_Vec aDimNormal = aDimVec ^ aViewUp;
  gp_Pln aViewPlane = gce_MakePln(theFirstPoint, aDimNormal);

  // Get intersection of view plane and projection line
  occ::handle<Geom_Plane> aPlane    = new Geom_Plane(aViewPlane);
  occ::handle<Geom_Line>  aProjLine = new Geom_Line(aProjLin);
  GeomAPI_IntCS           anIntersector(aProjLine, aPlane);
  if (!anIntersector.IsDone() || anIntersector.NbPoints() == 0)
  {
    return false;
  }

  theOutputPoint = anIntersector.Point(1);
  return true;
}

//=======================================================================
// function : ParseDimensionParams
// purpose  : Auxiliary function: sets aspect parameters for
//           length, angle, radius and diameter dimension.
//
// draw args: -text [3d|2d] [wf|sh|wireframe|shading] [Size]
//           -label [left|right|hcenter|hfit] [top|bottom|vcenter|vfit]
//           -arrow [external|internal|fit] [Length(int)]
//           -arrowangle ArrowAngle(degrees)
//           -plane xoy|yoz|zox
//           -flyout FloatValue -extension FloatValue
//           -autovalue
//           -value CustomRealValue
//           -textvalue CustomTextValue
//           -dispunits DisplayUnitsString
//           -modelunits ModelUnitsString
//           -showunits
//           -hideunits
//
// Warning! flyout is not an aspect value, it is for dimension parameter
// likewise text position, but text position override other parameters.
// For text position changing use 'vmovedim'.
//=======================================================================
static int ParseDimensionParams(
  int                                                                    theArgNum,
  const char**                                                           theArgVec,
  int                                                                    theStartIndex,
  const occ::handle<Prs3d_DimensionAspect>&                              theAspect,
  bool&                                                                  theIsCustomPlane,
  gp_Pln&                                                                thePlane,
  NCollection_DataMap<TCollection_AsciiString, double>&                  theRealParams,
  NCollection_DataMap<TCollection_AsciiString, TCollection_AsciiString>& theStringParams,
  NCollection_List<occ::handle<AIS_InteractiveObject>>*                  theShapeList = nullptr)
{
  theRealParams.Clear();
  theStringParams.Clear();

  theIsCustomPlane = false;

  // Begin from the second parameter: the first one is dimension name
  for (int anIt = theStartIndex; anIt < theArgNum; ++anIt)
  {
    TCollection_AsciiString aParam(theArgVec[anIt]);
    aParam.LowerCase();

    if (aParam.Search("-") == -1)
    {
      continue;
    }

    // Boolean flags
    if (aParam.IsEqual("-autovalue"))
    {
      theRealParams.Bind("autovalue", 1);
      continue;
    }

    if (aParam.IsEqual("-showunits"))
    {
      theAspect->MakeUnitsDisplayed(true);
      continue;
    }
    else if (aParam.IsEqual("-hideunits"))
    {
      theAspect->MakeUnitsDisplayed(false);
      continue;
    }
    else if (aParam.IsEqual("-selected"))
    {
      if (!theShapeList)
      {
        Message::SendFail() << "Error: unknown parameter '" << aParam << "'";
        return 1;
      }

      for (TheAISContext()->InitSelected(); TheAISContext()->MoreSelected();
           TheAISContext()->NextSelected())
      {
        TopoDS_Shape aShape = TheAISContext()->SelectedShape();
        if (!aShape.IsNull())
        {
          theShapeList->Append(new AIS_Shape(aShape));
        }
      }
      continue;
    }

    // Before all non-boolean flags parsing check if a flag have at least one value.
    if (anIt + 1 >= theArgNum)
    {
      Message::SendFail() << "Error: " << aParam << " flag should have value.";
      return 1;
    }

    // Non-boolean flags
    if (aParam.IsEqual("-shape") || aParam.IsEqual("-shapes"))
    {
      if (!theShapeList)
      {
        Message::SendFail() << "Error: unknown parameter '" << aParam << "'";
        return 1;
      }

      do
      {
        anIt++;
        TCollection_AsciiString            anArgString = theArgVec[anIt];
        occ::handle<AIS_InteractiveObject> anAISObject;
        const char*                        aStr   = anArgString.ToCString();
        TopoDS_Shape                       aShape = DBRep::Get(aStr);
        if (!aShape.IsNull())
        {
          anAISObject = new AIS_Shape(aShape);
        }
        else if (!GetMapOfAIS().Find2(anArgString, anAISObject) || anAISObject.IsNull())
        {
          Message::SendFail() << "Error: shape with name '" << aStr << "' is not found.";
          return 1;
        }
        theShapeList->Append(anAISObject);
      } while (anIt + 1 < theArgNum && theArgVec[anIt + 1][0] != '-');
    }
    else if (aParam.IsEqual("-text"))
    {
      do
      {
        anIt++;
        TCollection_AsciiString aValue(theArgVec[anIt]);
        aValue.LowerCase();
        if (aValue.IsEqual("3d"))
        {
          theAspect->MakeText3d(true);
        }
        else if (aValue.IsEqual("2d"))
        {
          theAspect->MakeText3d(false);
        }
        else if (aValue.IsEqual("wf") || aValue.IsEqual("wireframe"))
        {
          theAspect->MakeTextShaded(false);
        }
        else if (aValue.IsEqual("sh") || aValue.IsEqual("shading"))
        {
          theAspect->MakeTextShaded(true);
        }
        else if (aValue.IsIntegerValue()) // text size
        {
          theAspect->TextAspect()->SetHeight(Draw::Atoi(aValue.ToCString()));
        }
      } while (anIt + 1 < theArgNum && theArgVec[anIt + 1][0] != '-');
    }
    else if (aParam.IsEqual("-font"))
    {
      if (anIt + 1 >= theArgNum)
      {
        Message::SendFail() << "Error: wrong number of values for parameter '" << aParam << "'";
        return 1;
      }

      theAspect->TextAspect()->SetFont(theArgVec[++anIt]);
    }
    else if (aParam.IsEqual("-label"))
    {
      do
      {
        anIt++;
        TCollection_AsciiString aParamValue(theArgVec[anIt]);
        aParamValue.LowerCase();

        if (aParamValue == "left")
        {
          theAspect->SetTextHorizontalPosition(Prs3d_DTHP_Left);
        }
        else if (aParamValue == "right")
        {
          theAspect->SetTextHorizontalPosition(Prs3d_DTHP_Right);
        }
        else if (aParamValue == "hcenter")
        {
          theAspect->SetTextHorizontalPosition(Prs3d_DTHP_Center);
        }
        else if (aParamValue == "hfit")
        {
          theAspect->SetTextHorizontalPosition(Prs3d_DTHP_Fit);
        }
        else if (aParamValue == "above")
        {
          theAspect->SetTextVerticalPosition(Prs3d_DTVP_Above);
        }
        else if (aParamValue == "below")
        {
          theAspect->SetTextVerticalPosition(Prs3d_DTVP_Below);
        }
        else if (aParamValue == "vcenter")
        {
          theAspect->SetTextVerticalPosition(Prs3d_DTVP_Center);
        }
        else
        {
          Message::SendFail() << "Error: invalid label position: '" << aParamValue << "'.";
          return 1;
        }
      } while (anIt + 1 < theArgNum && theArgVec[anIt + 1][0] != '-');
    }
    else if (aParam.IsEqual("-arrow"))
    {
      TCollection_AsciiString aLocalParam(theArgVec[++anIt]);
      aLocalParam.LowerCase();

      if (aLocalParam == "external")
      {
        theAspect->SetArrowOrientation(Prs3d_DAO_External);
      }
      if (aLocalParam == "internal")
      {
        theAspect->SetArrowOrientation(Prs3d_DAO_Internal);
      }
      if (aLocalParam == "fit")
      {
        theAspect->SetArrowOrientation(Prs3d_DAO_Fit);
      }
    }
    else if (aParam.IsEqual("-zoomablearrow"))
    {
      TCollection_AsciiString aValue(theArgVec[++anIt]);
      bool                    isZoomableArrow = true;
      if (!Draw::ParseOnOff(aValue.ToCString(), isZoomableArrow))
      {
        Message::SendFail() << "Error: zoomable arrow value should be 0 or 1.";
        return 1;
      }
      theAspect->ArrowAspect()->SetZoomable(isZoomableArrow);
    }
    else if (aParam.IsEqual("-arrowlength") || aParam.IsEqual("-arlen"))
    {
      TCollection_AsciiString aValue(theArgVec[++anIt]);
      if (!aValue.IsRealValue(true))
      {
        Message::SendFail() << "Error: arrow length should be float degree value.";
        return 1;
      }
      theAspect->ArrowAspect()->SetLength(Draw::Atof(aValue.ToCString()));
    }
    else if (aParam.IsEqual("-arrowangle") || aParam.IsEqual("-arangle"))
    {
      TCollection_AsciiString aValue(theArgVec[++anIt]);
      if (!aValue.IsRealValue(true))
      {
        Message::SendFail("Error: arrow angle should be float degree value.");
        return 1;
      }
      theAspect->ArrowAspect()->SetAngle(Draw::Atof(aValue.ToCString()));
    }
    else if (aParam.IsEqual("-color"))
    {
      Quantity_Color aColor;
      int aNbParsed = Draw::ParseColor(theArgNum - anIt - 1, theArgVec + anIt + 1, aColor);
      anIt += aNbParsed;
      if (aNbParsed == 0)
      {
        Message::SendFail() << "Error: wrong syntax at '" << aParam << "'";
        return 1;
      }
      theAspect->SetCommonColor(aColor);
    }
    else if (aParam.IsEqual("-extension"))
    {
      TCollection_AsciiString aLocalParam(theArgVec[++anIt]);
      if (!aLocalParam.IsRealValue(true))
      {
        Message::SendFail("Error: extension size for dimension should be real value.");
        return 1;
      }
      theAspect->SetExtensionSize(Draw::Atof(aLocalParam.ToCString()));
    }
    else if (aParam.IsEqual("-plane"))
    {
      TCollection_AsciiString aValue(theArgVec[++anIt]);
      aValue.LowerCase();
      if (aValue == "xoy")
      {
        theIsCustomPlane = true;
        thePlane         = gp_Pln(gp_Ax3(gp::XOY()));
      }
      else if (aValue == "zox")
      {
        theIsCustomPlane = true;
        thePlane         = gp_Pln(gp_Ax3(gp::ZOX()));
      }
      else if (aValue == "yoz")
      {
        theIsCustomPlane = true;
        thePlane         = gp_Pln(gp_Ax3(gp::YOZ()));
      }
      else
      {
        Message::SendFail() << "Error: wrong plane '" << aValue << "'";
        return 1;
      }
    }
    else if (aParam.IsEqual("-flyout"))
    {
      TCollection_AsciiString aLocalParam(theArgVec[++anIt]);
      if (!aLocalParam.IsRealValue(true))
      {
        Message::SendFail("Error: flyout for dimension should be real value.");
        return 1;
      }

      theRealParams.Bind("flyout", Draw::Atof(aLocalParam.ToCString()));
    }
    else if (aParam.IsEqual("-value"))
    {
      TCollection_AsciiString aLocalParam(theArgVec[++anIt]);
      if (!aLocalParam.IsRealValue(true))
      {
        Message::SendFail("Error: dimension value for dimension should be real value");
        return 1;
      }

      theRealParams.Bind("value", Draw::Atof(aLocalParam.ToCString()));
    }
    else if (aParam.IsEqual("-textvalue"))
    {
      TCollection_AsciiString aLocalParam(theArgVec[++anIt]);

      theStringParams.Bind("textvalue", aLocalParam);
    }
    else if (aParam.IsEqual("-modelunits"))
    {
      TCollection_AsciiString aLocalParam(theArgVec[++anIt]);

      theStringParams.Bind("modelunits", aLocalParam);
    }
    else if (aParam.IsEqual("-dispunits"))
    {
      TCollection_AsciiString aLocalParam(theArgVec[++anIt]);

      theStringParams.Bind("dispunits", aLocalParam);
    }
    else
    {
      Message::SendFail() << "Error: unknown parameter '" << aParam << "'";
      return 1;
    }
  }

  return 0;
}

//=================================================================================================

static void SetDimensionParams(
  const occ::handle<PrsDim_Dimension>&                                         theDim,
  const NCollection_DataMap<TCollection_AsciiString, double>&                  theRealParams,
  const NCollection_DataMap<TCollection_AsciiString, TCollection_AsciiString>& theStringParams)
{
  if (theRealParams.IsBound("flyout"))
  {
    theDim->SetFlyout(theRealParams.Find("flyout"));
  }

  if (theRealParams.IsBound("autovalue"))
  {
    theDim->SetComputedValue();
  }

  if (theRealParams.IsBound("value"))
  {
    theDim->SetCustomValue(theRealParams.Find("value"));
  }

  if (theStringParams.IsBound("textvalue"))
  {
    theDim->SetCustomValue(theStringParams.Find("textvalue"));
  }

  if (theStringParams.IsBound("modelunits"))
  {
    theDim->SetModelUnits(theStringParams.Find("modelunits"));
  }

  if (theStringParams.IsBound("dispunits"))
  {
    theDim->SetDisplayUnits(theStringParams.Find("dispunits"));
  }
}

//=======================================================================
// function : ParseAngleDimensionParams
// purpose  : Auxiliary function: sets custom parameters for angle dimension.
//
// draw args: -type [interior|exterior]
//           -showarrow [first|second|both|none]
//=======================================================================
static int ParseAngleDimensionParams(
  int                                                                    theArgNum,
  const char**                                                           theArgVec,
  int                                                                    theStartIndex,
  NCollection_DataMap<TCollection_AsciiString, TCollection_AsciiString>& theStringParams)
{
  theStringParams.Clear();

  // Begin from the second parameter: the first one is dimension name
  for (int anIt = theStartIndex; anIt < theArgNum; ++anIt)
  {
    TCollection_AsciiString aParam(theArgVec[anIt]);
    aParam.LowerCase();

    if (aParam.Search("-") == -1)
    {
      Message::SendFail() << "Error: wrong parameter '" << aParam << "'.";
      return 1;
    }

    // Before all non-boolean flags parsing check if a flag have at least one value.
    if (anIt + 1 >= theArgNum)
    {
      Message::SendFail() << "Error: " << aParam << " flag should have value.";
      return 1;
    }

    if (aParam.IsEqual("-type"))
    {
      TCollection_AsciiString aLocalParam(theArgVec[++anIt]);

      theStringParams.Bind("type", aLocalParam);
    }
    else if (aParam.IsEqual("-showarrow"))
    {
      TCollection_AsciiString aLocalParam(theArgVec[++anIt]);

      theStringParams.Bind("showarrow", aLocalParam);
    }
    else
    {
      Message::SendFail() << "Error: unknown parameter '" << aParam << "'.";
      return 1;
    }
  }

  return 0;
}

//=======================================================================
// function : SetAngleDimensionParams
// purpose  : Sets parameters for angle dimension
//=======================================================================
static void SetAngleDimensionParams(
  const occ::handle<PrsDim_Dimension>&                                         theDim,
  const NCollection_DataMap<TCollection_AsciiString, TCollection_AsciiString>& theStringParams)
{
  occ::handle<PrsDim_AngleDimension> anAngleDim = occ::down_cast<PrsDim_AngleDimension>(theDim);
  if (anAngleDim.IsNull())
  {
    return;
  }

  if (theStringParams.IsBound("type"))
  {
    PrsDim_TypeOfAngle      anAngleType    = PrsDim_TypeOfAngle_Interior;
    TCollection_AsciiString anAngleTypeStr = theStringParams.Find("type");
    if (anAngleTypeStr.IsEqual("interior"))
    {
      anAngleType = PrsDim_TypeOfAngle_Interior;
    }
    else if (anAngleTypeStr.IsEqual("exterior"))
    {
      anAngleType = PrsDim_TypeOfAngle_Exterior;
    }
    else
    {
      Message::SendFail() << "Error: wrong angle type.";
    }
    anAngleDim->SetType(anAngleType);
  }

  if (theStringParams.IsBound("showarrow"))
  {
    PrsDim_TypeOfAngleArrowVisibility anArrowType    = PrsDim_TypeOfAngleArrowVisibility_Both;
    TCollection_AsciiString           anArrowTypeStr = theStringParams.Find("showarrow");
    if (anArrowTypeStr.IsEqual("both"))
    {
      anArrowType = PrsDim_TypeOfAngleArrowVisibility_Both;
    }
    else if (anArrowTypeStr.IsEqual("first"))
    {
      anArrowType = PrsDim_TypeOfAngleArrowVisibility_First;
    }
    else if (anArrowTypeStr.IsEqual("second"))
    {
      anArrowType = PrsDim_TypeOfAngleArrowVisibility_Second;
    }
    else if (anArrowTypeStr.IsEqual("none"))
    {
      anArrowType = PrsDim_TypeOfAngleArrowVisibility_None;
    }
    else
    {
      Message::SendFail() << "Error: wrong showarrow type.";
    }
    anAngleDim->SetArrowsVisibility(anArrowType);
  }
}

//=======================================================================
// function : VDimBuilder
// purpose  : Command for building dimension presentations: angle,
//           length, radius, diameter
//=======================================================================
static int VDimBuilder(Draw_Interpretor& /*theDi*/, int theArgsNb, const char** theArgs)
{
  if (theArgsNb < 2)
  {
    Message::SendFail("Syntax error: wrong number of arguments");
    return 1;
  }

  // Parse parameters
  TCollection_AsciiString aName(theArgs[1]);

  NCollection_List<occ::handle<AIS_InteractiveObject>> aShapes;
  occ::handle<Prs3d_DimensionAspect>                   anAspect      = new Prs3d_DimensionAspect();
  bool                                                 isPlaneCustom = false;
  gp_Pln                                               aWorkingPlane;

  NCollection_DataMap<TCollection_AsciiString, double>                  aRealParams;
  NCollection_DataMap<TCollection_AsciiString, TCollection_AsciiString> aStringParams;

  TCollection_AsciiString aDimType(theArgs[2]);
  aDimType.LowerCase();
  PrsDim_KindOfDimension aKindOfDimension;
  if (aDimType == "-length")
  {
    aKindOfDimension = PrsDim_KOD_LENGTH;
  }
  else if (aDimType == "-angle")
  {
    aKindOfDimension = PrsDim_KOD_PLANEANGLE;
  }
  else if (aDimType == "-radius")
  {
    aKindOfDimension = PrsDim_KOD_RADIUS;
  }
  else if (aDimType == "-diameter" || aDimType == "-diam")
  {
    aKindOfDimension = PrsDim_KOD_DIAMETER;
  }
  else
  {
    Message::SendFail("Error: wrong type of dimension");
    return 1;
  }

  if (ParseDimensionParams(theArgsNb,
                           theArgs,
                           3,
                           anAspect,
                           isPlaneCustom,
                           aWorkingPlane,
                           aRealParams,
                           aStringParams,
                           &aShapes))
  {
    return 1;
  }

  // Build dimension
  occ::handle<PrsDim_Dimension> aDim;
  switch (aKindOfDimension)
  {
    case PrsDim_KOD_LENGTH: {
      if (aShapes.Extent() == 1)
      {
        occ::handle<AIS_Shape> aFirstShapePrs = occ::down_cast<AIS_Shape>(aShapes.First());
        if (aFirstShapePrs.IsNull() || aFirstShapePrs->Shape().ShapeType() != TopAbs_EDGE)
        {
          Message::SendFail("Error: wrong shape type");
          return 1;
        }
        if (!isPlaneCustom)
        {
          Message::SendFail("Error: can not build dimension without working plane");
          return 1;
        }

        // Adjust working plane
        TopoDS_Edge   anEdge = TopoDS::Edge(aFirstShapePrs->Shape());
        TopoDS_Vertex aFirst, aSecond;
        TopExp::Vertices(anEdge, aFirst, aSecond);
        aDim = new PrsDim_LengthDimension(anEdge, aWorkingPlane);

        // Move standard plane (XOY, YOZ or ZOX) to the first point to make it working for dimension
        aWorkingPlane.SetLocation(occ::down_cast<PrsDim_LengthDimension>(aDim)->FirstPoint());
      }
      else if (aShapes.Extent() == 2)
      {
        TopoDS_Shape aShape1, aShape2;

        // Getting shapes
        if (occ::handle<AIS_Point> aPntPrs = occ::down_cast<AIS_Point>(aShapes.First()))
        {
          aShape1 = aPntPrs->Vertex();
        }
        else if (occ::handle<AIS_Shape> aShapePrs = occ::down_cast<AIS_Shape>(aShapes.First()))
        {
          aShape1 = aShapePrs->Shape();
        }

        if (occ::handle<AIS_Point> aPntPrs = occ::down_cast<AIS_Point>(aShapes.Last()))
        {
          aShape2 = aPntPrs->Vertex();
        }
        else if (occ::handle<AIS_Shape> aShapePrs = occ::down_cast<AIS_Shape>(aShapes.Last()))
        {
          aShape2 = aShapePrs->Shape();
        }

        if (aShape1.IsNull() || aShape2.IsNull())
        {
          Message::SendFail("Error: wrong shape type.");
          return 1;
        }

        // Face-Face case
        occ::handle<PrsDim_LengthDimension> aLenDim = new PrsDim_LengthDimension();
        if (isPlaneCustom)
        {
          if (aShape1.ShapeType() == TopAbs_VERTEX)
          {
            aWorkingPlane.SetLocation(BRep_Tool::Pnt(TopoDS::Vertex(aShape1)));
          }
          else if (aShape2.ShapeType() == TopAbs_VERTEX)
          {
            aWorkingPlane.SetLocation(BRep_Tool::Pnt(TopoDS::Vertex(aShape2)));
          }
          aLenDim->SetCustomPlane(aWorkingPlane);
        }
        else if (aShape1.ShapeType() == TopAbs_VERTEX && aShape2.ShapeType() == TopAbs_VERTEX)
        {
          Message::SendFail("Error: can not build dimension without working plane");
          return 1;
        }
        aLenDim->SetMeasuredShapes(aShape1, aShape2);
        aDim = aLenDim;
      }
      else
      {
        Message::SendFail("Error: wrong number of shapes to build dimension");
        return 1;
      }

      break;
    }
    case PrsDim_KOD_PLANEANGLE: {
      switch (aShapes.Extent())
      {
        case 1: {
          if (occ::handle<AIS_Shape> aShape = occ::down_cast<AIS_Shape>(aShapes.First()))
          {
            if (aShape->Shape().ShapeType() == TopAbs_FACE)
            {
              aDim = new PrsDim_AngleDimension(TopoDS::Face(aShape->Shape()));
            }
          }
          break;
        }
        case 2: {
          occ::handle<AIS_Shape> aShape1 = occ::down_cast<AIS_Shape>(aShapes.First());
          occ::handle<AIS_Shape> aShape2 = occ::down_cast<AIS_Shape>(aShapes.Last());
          if (!aShape1.IsNull() && !aShape2.IsNull() && aShape1->Shape().ShapeType() == TopAbs_EDGE
              && aShape2->Shape().ShapeType() == TopAbs_EDGE)
          {
            aDim = new PrsDim_AngleDimension(TopoDS::Edge(aShape1->Shape()),
                                             TopoDS::Edge(aShape2->Shape()));
          }
          else
          {
            Message::SendFail("Error: wrong shapes for angle dimension");
            return 1;
          }
          break;
        }
        case 3: {
          gp_Pnt aPnts[3];
          int    aPntIndex = 0;
          for (NCollection_List<occ::handle<AIS_InteractiveObject>>::Iterator aPntIter(aShapes);
               aPntIter.More();
               aPntIter.Next())
          {
            if (occ::handle<AIS_Point> aPoint = occ::down_cast<AIS_Point>(aPntIter.Value()))
            {
              aPnts[aPntIndex++] = aPoint->Component()->Pnt();
            }
          }
          if (aPntIndex == 3)
          {
            aDim = new PrsDim_AngleDimension(aPnts[0], aPnts[1], aPnts[2]);
          }
          break;
        }
      }
      if (aDim.IsNull())
      {
        Message::SendFail("Error: wrong number of shapes to build dimension");
        return 1;
      }
      break;
    }
    case PrsDim_KOD_RADIUS: // radius of the circle
    {
      gp_Pnt anAnchor;
      bool   hasAnchor = false;
      for (NCollection_List<occ::handle<AIS_InteractiveObject>>::Iterator aShapeIter(aShapes);
           aShapeIter.More();
           aShapeIter.Next())
      {
        if (occ::handle<AIS_Point> aPoint = occ::down_cast<AIS_Point>(aShapeIter.Value()))
        {
          hasAnchor = true;
          anAnchor  = aPoint->Component()->Pnt();
          aShapes.Remove(aShapeIter);
          break;
        }
      }
      if (aShapes.Extent() != 1)
      {
        Message::SendFail("Syntax error: wrong number of shapes to build dimension");
        return 1;
      }

      if (occ::handle<AIS_Circle> aShapeCirc = occ::down_cast<AIS_Circle>(aShapes.First()))
      {
        gp_Circ aCircle = aShapeCirc->Circle()->Circ();
        if (hasAnchor)
        {
          aDim = new PrsDim_RadiusDimension(aCircle, anAnchor);
        }
        else
        {
          aDim = new PrsDim_RadiusDimension(aCircle);
        }
      }
      else if (occ::handle<AIS_Shape> aShape = occ::down_cast<AIS_Shape>(aShapes.First()))
      {
        occ::handle<PrsDim_RadiusDimension> aRadDim = new PrsDim_RadiusDimension(aShape->Shape());
        if (hasAnchor)
        {
          aRadDim->SetMeasuredGeometry(aShape->Shape(), anAnchor);
        }
        aDim = aRadDim;
      }
      else
      {
        Message::SendFail("Error: shape for radius has wrong type");
        return 1;
      }
      break;
    }
    case PrsDim_KOD_DIAMETER: {
      if (aShapes.Extent() == 1)
      {
        if (aShapes.First()->DynamicType() == STANDARD_TYPE(AIS_Circle))
        {
          occ::handle<AIS_Circle> aShape  = occ::down_cast<AIS_Circle>(aShapes.First());
          gp_Circ                 aCircle = aShape->Circle()->Circ();
          aDim                            = new PrsDim_DiameterDimension(aCircle);
        }
        else
        {
          occ::handle<AIS_Shape> aShape = occ::down_cast<AIS_Shape>(aShapes.First());
          if (aShape.IsNull())
          {
            Message::SendFail("Error: shape for radius is of wrong type");
            return 1;
          }
          aDim = new PrsDim_DiameterDimension(aShape->Shape());
        }
      }
      else
      {
        Message::SendFail("Error: wrong number of shapes to build dimension");
        return 1;
      }

      break;
    }
    default: {
      Message::SendFail("Error: wrong type of dimension. Type help for more information");
      return 1;
    }
  }

  // Check dimension geometry
  if (!aDim->IsValid())
  {
    Message::SendFail() << "Error: dimension geometry is invalid, " << aDimType
                        << " dimension can't be built on input shapes.";
    return 1;
  }

  aDim->SetDimensionAspect(anAspect);

  SetDimensionParams(aDim, aRealParams, aStringParams);

  VDisplayAISObject(aName, aDim);

  return 0;
}

namespace
{
//! If the given shapes are edges then check whether they are parallel else return true.
bool IsParallel(const TopoDS_Shape& theShape1, const TopoDS_Shape& theShape2)
{
  if (theShape1.ShapeType() == TopAbs_EDGE && theShape2.ShapeType() == TopAbs_EDGE)
  {
    BRepExtrema_ExtCC aDelta(TopoDS::Edge(theShape1), TopoDS::Edge(theShape2));
    return aDelta.IsParallel();
  }

  return true;
}
} // namespace

//=======================================================================
// function : VRelationBuilder
// purpose  : Command for building relation presentation
//=======================================================================
static int VRelationBuilder(Draw_Interpretor& /*theDi*/, int theArgsNb, const char** theArgs)
{
  if (theArgsNb < 2)
  {
    Message::SendFail("Error: wrong number of arguments");
    return 1;
  }

  TCollection_AsciiString aName(theArgs[1]);
  TCollection_AsciiString aType(theArgs[2]);

  PrsDim_KindOfRelation aKindOfRelation = PrsDim_KOR_NONE;
  if (aType == "-concentric")
  {
    aKindOfRelation = PrsDim_KOR_CONCENTRIC;
  }
  else if (aType == "-equaldistance")
  {
    aKindOfRelation = PrsDim_KOR_EQUALDISTANCE;
  }
  else if (aType == "-equalradius")
  {
    aKindOfRelation = PrsDim_KOR_EQUALRADIUS;
  }
  else if (aType == "-fix")
  {
    aKindOfRelation = PrsDim_KOR_FIX;
  }
  else if (aType == "-identic")
  {
    aKindOfRelation = PrsDim_KOR_IDENTIC;
  }
  else if (aType == "-offset")
  {
    aKindOfRelation = PrsDim_KOR_OFFSET;
  }
  else if (aType == "-parallel")
  {
    aKindOfRelation = PrsDim_KOR_PARALLEL;
  }
  else if (aType == "-perpendicular")
  {
    aKindOfRelation = PrsDim_KOR_PERPENDICULAR;
  }
  else if (aType == "-tangent")
  {
    aKindOfRelation = PrsDim_KOR_TANGENT;
  }
  else if (aType == "-symmetric")
  {
    aKindOfRelation = PrsDim_KOR_SYMMETRIC;
  }

  NCollection_List<TopoDS_Shape> aShapes;
  ViewerTest::GetSelectedShapes(aShapes);

  // Build relation.
  occ::handle<PrsDim_Relation> aRelation;
  switch (aKindOfRelation)
  {
    case PrsDim_KOR_CONCENTRIC: {
      if (aShapes.Extent() != 2)
      {
        Message::SendFail("Error: Wrong number of selected shapes");
        return 1;
      }

      const TopoDS_Shape& aShape1 = aShapes.First();
      const TopoDS_Shape& aShape2 = aShapes.Last();

      if (aShape1.ShapeType() != TopAbs_EDGE || aShape2.ShapeType() != TopAbs_EDGE)
      {
        Message::SendFail("Syntax error: selected shapes are not edges");
        return 1;
      }

      BRepAdaptor_Curve aCurve1(TopoDS::Edge(aShape1));
      gp_Circ           aCircle1 = aCurve1.Circle();
      gp_Pnt            aCenter1 = aCircle1.Location();
      gp_Pnt            B        = aCurve1.Value(0.25);
      gp_Pnt            C        = aCurve1.Value(0.75);
      GC_MakePlane      aMkPlane(aCenter1, B, C);

      aRelation = new PrsDim_ConcentricRelation(aShape1, aShape2, aMkPlane.Value());

      break;
    }
    case PrsDim_KOR_EQUALDISTANCE: {
      if (aShapes.Extent() != 4)
      {
        Message::SendFail("Error: Wrong number of selected shapes");
        return 1;
      }

      TopoDS_Shape aSelectedShapes[4];

      int                                      anIdx = 0;
      NCollection_List<TopoDS_Shape>::Iterator anIter(aShapes);
      for (; anIter.More(); anIter.Next(), ++anIdx)
      {
        aSelectedShapes[anIdx] = anIter.Value();
      }

      if (!IsParallel(aSelectedShapes[0], aSelectedShapes[1])
          || !IsParallel(aSelectedShapes[2], aSelectedShapes[3]))
      {
        Message::SendFail("Syntax error: non parallel edges");
        return 1;
      }

      gp_Pnt A, B, C;
      if (aSelectedShapes[0].ShapeType() == TopAbs_EDGE)
      {
        TopoDS_Vertex Va, Vb;
        TopExp::Vertices(TopoDS::Edge(aSelectedShapes[0]), Va, Vb);
        A = BRep_Tool::Pnt(Va);
        B = BRep_Tool::Pnt(Vb);

        if (aSelectedShapes[1].ShapeType() == TopAbs_EDGE)
        {
          TopoDS_Vertex Vc, Vd;
          TopExp::Vertices(TopoDS::Edge(aSelectedShapes[1]), Vc, Vd);
          C = BRep_Tool::Pnt(Vc);
        }
        else
        {
          C = BRep_Tool::Pnt(TopoDS::Vertex(aSelectedShapes[1]));
        }
      }
      else
      {
        A = BRep_Tool::Pnt(TopoDS::Vertex(aSelectedShapes[0]));

        if (aSelectedShapes[1].ShapeType() == TopAbs_EDGE)
        {
          TopoDS_Vertex Vb, Vc;
          TopExp::Vertices(TopoDS::Edge(aSelectedShapes[1]), Vb, Vc);
          B = BRep_Tool::Pnt(Vb);
          C = BRep_Tool::Pnt(Vc);
        }
        else
        {
          B = BRep_Tool::Pnt(TopoDS::Vertex(aSelectedShapes[1]));
          C.SetX(B.X() + 5.0);
          C.SetY(B.Y() + 5.0);
          C.SetZ(B.Z() + 5.0);
        }
      }

      GC_MakePlane aMkPlane(A, B, C);
      aRelation = new PrsDim_EqualDistanceRelation(aSelectedShapes[0],
                                                   aSelectedShapes[1],
                                                   aSelectedShapes[2],
                                                   aSelectedShapes[3],
                                                   aMkPlane.Value());

      break;
    }
    case PrsDim_KOR_EQUALRADIUS: {
      if (aShapes.Extent() != 2 && aShapes.Extent() != 1)
      {
        Message::SendFail("Error: Wrong number of selected shapes");
        return 1;
      }

      const TopoDS_Shape& aShape1 = aShapes.First();
      const TopoDS_Shape& aShape2 = (aShapes.Extent() == 2) ? aShapes.Last() : aShape1;
      if (aShape1.ShapeType() != TopAbs_EDGE || aShape2.ShapeType() != TopAbs_EDGE)
      {
        Message::SendFail("Syntax error: selected shapes are not edges");
        return 1;
      }

      TopoDS_Edge       anEdge1 = TopoDS::Edge(aShape1);
      TopoDS_Edge       anEdge2 = TopoDS::Edge(aShape2);
      BRepAdaptor_Curve aCurve1(anEdge1);
      gp_Pnt            A = aCurve1.Value(0.1);
      gp_Pnt            B = aCurve1.Value(0.5);
      gp_Pnt            C = aCurve1.Value(0.9);
      GC_MakePlane      aMkPlane(A, B, C);

      aRelation = new PrsDim_EqualRadiusRelation(anEdge1, anEdge2, aMkPlane.Value());
      break;
    }
    case PrsDim_KOR_FIX: {
      if (aShapes.Extent() != 1)
      {
        Message::SendFail("Error: Wrong number of selected shapes");
        return 1;
      }

      const TopoDS_Shape& aShape = aShapes.First();
      if (aShape.ShapeType() != TopAbs_EDGE)
      {
        Message::SendFail("Syntax error: selected shapes are not edges");
        return 1;
      }

      TopoDS_Edge       anEdge = TopoDS::Edge(aShape);
      BRepAdaptor_Curve aCurve(anEdge);
      gp_Pnt            A = aCurve.Value(0.1);
      gp_Pnt            B = aCurve.Value(0.5);
      gp_Pnt            D = aCurve.Value(0.9);
      gp_Pnt            C(B.X() + 5.0, B.Y() + 5.0, B.Z() + 5.0);
      GC_MakePlane      aMkPlane(A, D, C);

      aRelation = new PrsDim_FixRelation(anEdge, aMkPlane.Value());
      break;
    }
    case PrsDim_KOR_IDENTIC: {
      if (aShapes.Extent() != 2)
      {
        Message::SendFail("Error: Wrong number of selected shapes");
        return 1;
      }

      const TopoDS_Shape& aShapeA = aShapes.First();
      const TopoDS_Shape& aShapeB = aShapes.Last();

      gp_Pnt A, B, C;
      if (aShapeA.ShapeType() == TopAbs_EDGE)
      {
        TopoDS_Edge       anEdgeA = TopoDS::Edge(aShapeA);
        BRepAdaptor_Curve aCurveA(anEdgeA);

        A = aCurveA.Value(0.1);
        B = aCurveA.Value(0.9);
        C.SetX(B.X() + 5.0);
        C.SetY(B.Y() + 5.0);
        C.SetZ(B.Z() + 5.0);
      }
      else if (aShapeA.ShapeType() == TopAbs_VERTEX)
      {
        if (aShapeB.ShapeType() == TopAbs_EDGE)
        {
          TopoDS_Edge       anEdgeB = TopoDS::Edge(aShapeB);
          BRepAdaptor_Curve aCurveB(anEdgeB);

          A = aCurveB.Value(0.1);
          B = aCurveB.Value(0.9);
          C.SetX(B.X() + 5.0);
          C.SetY(B.Y() + 5.0);
          C.SetZ(B.Z() + 5.0);
        }
        else if (aShapeB.ShapeType() == TopAbs_FACE)
        {
          TopoDS_Face       aFaceB = TopoDS::Face(aShapeB);
          TopExp_Explorer   aFaceExp(aFaceB, TopAbs_EDGE);
          TopoDS_Edge       anEdgeFromB = TopoDS::Edge(aFaceExp.Current());
          BRepAdaptor_Curve aCurveB(anEdgeFromB);
          A = aCurveB.Value(0.1);
          B = aCurveB.Value(0.5);
          C = aCurveB.Value(0.9);
        }
        else
        {
          A = BRep_Tool::Pnt(TopoDS::Vertex(aShapeA));
          B = BRep_Tool::Pnt(TopoDS::Vertex(aShapeB));
          C.SetX(B.X() + 5.0);
          C.SetY(B.Y() + 5.0);
          C.SetZ(B.Z() + 5.0);
        }
      }
      else
      {
        TopoDS_Face       aFaceA = TopoDS::Face(aShapeA);
        TopExp_Explorer   aFaceExp(aFaceA, TopAbs_EDGE);
        TopoDS_Edge       anEdgeFromA = TopoDS::Edge(aFaceExp.Current());
        BRepAdaptor_Curve aCurveA(anEdgeFromA);
        A = aCurveA.Value(0.1);
        B = aCurveA.Value(0.5);
        C = aCurveA.Value(0.9);
      }

      GC_MakePlane aMkPlane(A, B, C);
      aRelation = new PrsDim_IdenticRelation(aShapeA, aShapeB, aMkPlane.Value());
      break;
    }
    case PrsDim_KOR_OFFSET: {
      if (aShapes.Extent() != 2)
      {
        Message::SendFail("Error: Wrong number of selected shapes");
        return 1;
      }

      const TopoDS_Shape& aShape1 = aShapes.First();
      const TopoDS_Shape& aShape2 = aShapes.Last();
      if (aShape1.ShapeType() != TopAbs_FACE || aShape2.ShapeType() != TopAbs_FACE)
      {
        Message::SendFail("Syntax error: selected shapes are not faces");
        return 1;
      }

      TopoDS_Face aFace1 = TopoDS::Face(aShape1);
      TopoDS_Face aFace2 = TopoDS::Face(aShape2);

      BRepExtrema_ExtFF aDelta(aFace1, aFace2);
      if (!aDelta.IsParallel())
      {
        Message::SendFail("Syntax error: the faces are not parallel");
        return 1;
      }

      double                     aDist = std::round(sqrt(aDelta.SquareDistance(1)) * 10.0) / 10.0;
      TCollection_ExtendedString aMessage(TCollection_ExtendedString("offset=")
                                          + TCollection_ExtendedString(aDist));
      aRelation = new PrsDim_OffsetDimension(aFace1, aFace2, aDist, aMessage);
      break;
    }
    case PrsDim_KOR_PARALLEL: {
      if (aShapes.Extent() != 2)
      {
        Message::SendFail("Error: wrong number of selected shapes");
        return 1;
      }

      const TopoDS_Shape& aShapeA = aShapes.First();
      const TopoDS_Shape& aShapeB = aShapes.Last();
      if (aShapeA.ShapeType() == TopAbs_EDGE)
      {
        TopoDS_Edge       anEdgeA = TopoDS::Edge(aShapeA);
        TopoDS_Edge       anEdgeB = TopoDS::Edge(aShapeB);
        BRepExtrema_ExtCC aDeltaEdge(anEdgeA, anEdgeB);

        if (!aDeltaEdge.IsParallel())
        {
          Message::SendFail("Error: the edges are not parallel");
          return 1;
        }

        BRepAdaptor_Curve aCurveA(anEdgeA);
        BRepAdaptor_Curve aCurveB(anEdgeB);

        gp_Pnt A = aCurveA.Value(0.1);
        gp_Pnt B = aCurveA.Value(0.9);
        gp_Pnt C = aCurveB.Value(0.5);

        GC_MakePlane aMkPlane(A, B, C);

        aRelation = new PrsDim_ParallelRelation(anEdgeA, anEdgeB, aMkPlane.Value());
      }
      else
      {
        TopoDS_Face aFaceA = TopoDS::Face(aShapeA);
        TopoDS_Face aFaceB = TopoDS::Face(aShapeB);

        BRepExtrema_ExtFF aDeltaFace(aFaceA, aFaceB);
        if (!aDeltaFace.IsParallel())
        {
          Message::SendFail("Error: the faces are not parallel");
          return 1;
        }

        TopExp_Explorer aFaceExpA(aFaceA, TopAbs_EDGE);
        TopExp_Explorer aFaceExpB(aFaceB, TopAbs_EDGE);

        TopoDS_Edge anEdgeA = TopoDS::Edge(aFaceExpA.Current());
        TopoDS_Edge anEdgeB = TopoDS::Edge(aFaceExpB.Current());

        BRepAdaptor_Curve aCurveA(anEdgeA);
        BRepAdaptor_Curve aCurveB(anEdgeB);
        gp_Pnt            A = aCurveA.Value(0.1);
        gp_Pnt            B = aCurveA.Value(0.9);
        gp_Pnt            C = aCurveB.Value(0.5);

        GC_MakePlane aMkPlane(A, B, C);

        aRelation = new PrsDim_ParallelRelation(aFaceA, aFaceB, aMkPlane.Value());
      }
      break;
    }
    case PrsDim_KOR_PERPENDICULAR: {
      if (aShapes.Extent() != 2)
      {
        Message::SendFail("Error: Wrong number of selected shapes");
        return 1;
      }

      const TopoDS_Shape& aShapeA = aShapes.First();
      const TopoDS_Shape& aShapeB = aShapes.Last();

      if (aShapeA.ShapeType() == TopAbs_EDGE)
      {
        TopoDS_Edge anEdgeA = TopoDS::Edge(aShapeA);
        TopoDS_Edge anEdgeB = TopoDS::Edge(aShapeB);

        BRepAdaptor_Curve aCurveA(anEdgeA);
        BRepAdaptor_Curve aCurveB(anEdgeB);

        gp_Pnt A = aCurveA.Value(0.1);
        gp_Pnt B = aCurveA.Value(0.9);
        gp_Pnt C = aCurveB.Value(0.5);

        GC_MakePlane aMkPlane(A, B, C);

        aRelation = new PrsDim_PerpendicularRelation(anEdgeA, anEdgeB, aMkPlane.Value());
      }
      else
      {
        TopoDS_Face aFaceA = TopoDS::Face(aShapeA);
        TopoDS_Face aFaceB = TopoDS::Face(aShapeB);

        TopExp_Explorer aFaceExpA(aFaceA, TopAbs_EDGE);
        TopExp_Explorer aFaceExpB(aFaceB, TopAbs_EDGE);

        TopoDS_Edge anEdgeA = TopoDS::Edge(aFaceExpA.Current());
        TopoDS_Edge anEdgeB = TopoDS::Edge(aFaceExpB.Current());

        BRepAdaptor_Curve aCurveA(anEdgeA);
        BRepAdaptor_Curve aCurveB(anEdgeB);

        gp_Pnt A = aCurveA.Value(0.1);
        gp_Pnt B = aCurveA.Value(0.9);
        gp_Pnt C = aCurveB.Value(0.5);

        GC_MakePlane aMkPlane(A, B, C);

        aRelation = new PrsDim_PerpendicularRelation(aFaceA, aFaceB);
      }

      break;
    }
    case PrsDim_KOR_TANGENT: {
      if (aShapes.Extent() != 2)
      {
        Message::SendFail("Error: Wrong number of selected shapes");
        return 1;
      }

      const TopoDS_Shape& aShapeA = aShapes.First();
      const TopoDS_Shape& aShapeB = aShapes.Last();

      if (aShapeA.ShapeType() == TopAbs_EDGE)
      {
        TopoDS_Edge anEdgeA = TopoDS::Edge(aShapeA);
        TopoDS_Edge anEdgeB = TopoDS::Edge(aShapeB);

        BRepAdaptor_Curve aCurveA(anEdgeA);
        BRepAdaptor_Curve aCurveB(anEdgeB);

        gp_Pnt A = aCurveA.Value(0.1);
        gp_Pnt B = aCurveA.Value(0.9);
        gp_Pnt C = aCurveB.Value(0.5);

        GC_MakePlane aMkPlane(A, B, C);

        aRelation = new PrsDim_TangentRelation(anEdgeA, anEdgeB, aMkPlane.Value());
      }
      else
      {
        TopoDS_Face aFaceA = TopoDS::Face(aShapeA);
        TopoDS_Face aFaceB = TopoDS::Face(aShapeB);

        TopExp_Explorer aFaceExpA(aFaceA, TopAbs_EDGE);
        TopExp_Explorer aFaceExpB(aFaceB, TopAbs_EDGE);

        TopoDS_Edge anEdgeA = TopoDS::Edge(aFaceExpA.Current());
        TopoDS_Edge anEdgeB = TopoDS::Edge(aFaceExpB.Current());

        BRepAdaptor_Curve aCurveA(anEdgeA);
        BRepAdaptor_Curve aCurveB(anEdgeB);

        gp_Pnt A = aCurveA.Value(0.1);
        gp_Pnt B = aCurveA.Value(0.9);
        gp_Pnt C = aCurveB.Value(0.5);

        GC_MakePlane aMkPlane(A, B, C);

        aRelation = new PrsDim_TangentRelation(aFaceA, aFaceB, aMkPlane.Value());
      }
      break;
    }
    case PrsDim_KOR_SYMMETRIC: {
      if (aShapes.Extent() != 3)
      {
        Message::SendFail("Error: Wrong number of selected shapes");
        return 1;
      }

      TopoDS_Shape                             aSelectedShapes[3];
      int                                      anIdx = 0;
      NCollection_List<TopoDS_Shape>::Iterator anIter(aShapes);
      for (; anIter.More(); anIter.Next(), ++anIdx)
      {
        aSelectedShapes[anIdx] = anIter.Value();
      }

      TopoDS_Edge anEdgeA = TopoDS::Edge(aSelectedShapes[0]);
      if (aSelectedShapes[1].ShapeType() == TopAbs_EDGE)
      {
        // 1 - edge,  2 - edge, 3 - edge.
        TopoDS_Edge anEdgeB = TopoDS::Edge(aSelectedShapes[1]);
        TopoDS_Edge anEdgeC = TopoDS::Edge(aSelectedShapes[2]);

        BRepExtrema_ExtCC aDeltaEdgeAB(anEdgeA, anEdgeB);
        BRepExtrema_ExtCC aDeltaEdgeAC(anEdgeA, anEdgeC);

        if (!aDeltaEdgeAB.IsParallel())
        {
          Message::SendFail("Syntax error: the edges are not parallel");
          return 1;
        }
        if (!aDeltaEdgeAC.IsParallel())
        {
          Message::SendFail("Syntax error: the edges are not parallel");
          return 1;
        }

        TopoDS_Vertex Va, Vb, Vc, Vd;
        TopExp::Vertices(anEdgeB, Va, Vb);
        TopExp::Vertices(anEdgeC, Vc, Vd);
        gp_Pnt A = BRep_Tool::Pnt(Va);
        gp_Pnt B = BRep_Tool::Pnt(Vc);
        gp_Pnt C = Get3DPointAtMousePosition();

        GC_MakePlane aMkPlane(A, B, C);

        aRelation = new PrsDim_SymmetricRelation(anEdgeA, anEdgeB, anEdgeC, aMkPlane.Value());
      }
      else
      {
        // 1 - edge, 2 - vertex, 3 - vertex
        TopoDS_Vertex aVertexB = TopoDS::Vertex(aSelectedShapes[1]);
        TopoDS_Vertex aVertexC = TopoDS::Vertex(aSelectedShapes[2]);

        gp_Pnt B = BRep_Tool::Pnt(aVertexB);
        gp_Pnt C = BRep_Tool::Pnt(aVertexC);

        TopoDS_Vertex Va, Vb;
        TopExp::Vertices(anEdgeA, Va, Vb);
        gp_Pnt A = BRep_Tool::Pnt(Va);

        GC_MakePlane aMkPlane(A, B, C);
        aRelation = new PrsDim_SymmetricRelation(anEdgeA, aVertexB, aVertexC, aMkPlane.Value());
      }

      break;
    }
    case PrsDim_KOR_NONE: {
      Message::SendFail("Error: Unknown type of relation!");
      return 1;
    }
  }

  VDisplayAISObject(aName, aRelation);
  return 0;
}

//=======================================================================
// function : VDimParam
// purpose  : Sets aspect parameters to dimension.
//=======================================================================
static int VDimParam(Draw_Interpretor& theDi, int theArgNum, const char** theArgVec)
{
  if (theArgNum < 3)
  {
    theDi << theArgVec[0] << " error: the wrong number of input parameters.\n";
    return 1;
  }

  TCollection_AsciiString aName(theArgVec[1]);
  gp_Pln                  aWorkingPlane;
  bool                    isCustomPlane = false;
  bool                    toUpdate      = true;

  NCollection_DataMap<TCollection_AsciiString, double>                  aRealParams;
  NCollection_DataMap<TCollection_AsciiString, TCollection_AsciiString> aStringParams;

  occ::handle<AIS_InteractiveObject> anObject;
  if (!GetMapOfAIS().Find2(aName, anObject))
  {
    theDi << theArgVec[0] << "error: no object with this name.\n";
    return 1;
  }
  occ::handle<PrsDim_Dimension> aDim = occ::down_cast<PrsDim_Dimension>(anObject);
  if (aDim.IsNull())
  {
    theDi << theArgVec[0] << "error: no dimension with this name.\n";
    return 1;
  }

  occ::handle<Prs3d_DimensionAspect> anAspect = aDim->DimensionAspect();

  if (ParseDimensionParams(theArgNum,
                           theArgVec,
                           2,
                           anAspect,
                           isCustomPlane,
                           aWorkingPlane,
                           aRealParams,
                           aStringParams))
  {
    return 1;
  }

  if (isCustomPlane)
  {
    aDim->SetCustomPlane(aWorkingPlane);
  }

  SetDimensionParams(aDim, aRealParams, aStringParams);

  if (!aDim->IsValid())
  {
    Message::SendFail("Error: Dimension geometry or plane is not valid");
    return 1;
  }

  // Redisplay a dimension after parameter changing.
  if (ViewerTest::GetAISContext()->IsDisplayed(aDim))
  {
    ViewerTest::GetAISContext()->Redisplay(aDim, toUpdate);
  }

  return 0;
}

//=======================================================================
// function : VLengthParam
// purpose  : Sets parameters to length dimension.
//=======================================================================
static int VLengthParam(Draw_Interpretor&, int theArgNum, const char** theArgVec)
{
  if (theArgNum < 3)
  {
    Message::SendFail("Syntax error: the wrong number of input parameters");
    return 1;
  }

  TCollection_AsciiString            aName(theArgVec[1]);
  occ::handle<AIS_InteractiveObject> anObject;
  if (!GetMapOfAIS().Find2(aName, anObject))
  {
    Message::SendFail() << "Syntax error: no object with name '" << aName << "'";
    return 1;
  }

  occ::handle<PrsDim_LengthDimension> aLengthDim = occ::down_cast<PrsDim_LengthDimension>(anObject);
  if (aLengthDim.IsNull())
  {
    Message::SendFail() << "Syntax error: no length dimension with name '" << aName << "'";
    return 1;
  }

  // parse direction value
  gp_Dir                  aDirection;
  int                     anArgumentIt = 2;
  TCollection_AsciiString aParam(theArgVec[anArgumentIt]);
  aParam.LowerCase();

  bool isCustomDirection = false;
  if (aParam.IsEqual("-direction"))
  {
    if (anArgumentIt + 1 >= theArgNum)
    {
      Message::SendFail() << "Error: " << aParam << " direction should have value";
      return 1;
    }
    anArgumentIt++;
    isCustomDirection              = true;
    TCollection_AsciiString aValue = theArgVec[anArgumentIt];
    aValue.LowerCase();
    if (aValue == "ox")
    {
      aDirection = gp::DX();
    }
    else if (aValue == "oy")
    {
      aDirection = gp::DY();
    }
    else if (aValue == "oz")
    {
      aDirection = gp::DZ();
    }
    else if (aValue == "autodirection")
    {
      isCustomDirection = false;
    }
    else
    {
      if (anArgumentIt + 2 >= theArgNum)
      {
        Message::SendFail() << "Error: wrong number of values for parameter '" << aParam << "'";
        return 1;
      }
      // access coordinate arguments
      NCollection_Sequence<double> aCoords;
      for (; anArgumentIt < theArgNum; ++anArgumentIt)
      {
        TCollection_AsciiString anArg(theArgVec[anArgumentIt]);
        if (!anArg.IsRealValue(true))
        {
          break;
        }
        aCoords.Append(anArg.RealValue());
      }
      // non-numeric argument too early
      if (aCoords.IsEmpty() || aCoords.Size() != 3)
      {
        Message::SendFail("Error: wrong number of direction arguments");
        return 1;
      }
      aDirection = gp_Dir(aCoords.Value(1), aCoords.Value(2), aCoords.Value(3));
    }
  }

  aLengthDim->SetDirection(aDirection, isCustomDirection);
  if (!aLengthDim->IsValid())
  {
    Message::SendFail("Error: Dimension geometry or plane is not valid");
    return 1;
  }

  // Redisplay a dimension after parameter changing.
  if (ViewerTest::GetAISContext()->IsDisplayed(aLengthDim))
  {
    ViewerTest::GetAISContext()->Redisplay(aLengthDim, true);
  }

  return 0;
}

//=======================================================================
// function : VAngleParam
// purpose  : Sets aspect parameters to angle dimension.
//=======================================================================
static int VAngleParam(Draw_Interpretor& theDi, int theArgNum, const char** theArgVec)
{
  if (theArgNum < 3)
  {
    theDi << theArgVec[0] << " error: the wrong number of input parameters.\n";
    return 1;
  }

  TCollection_AsciiString aName(theArgVec[1]);
  bool                    toUpdate = true;

  NCollection_DataMap<TCollection_AsciiString, TCollection_AsciiString> aStringParams;
  occ::handle<AIS_InteractiveObject>                                    anObject;
  if (!GetMapOfAIS().Find2(aName, anObject))
  {
    theDi << theArgVec[0] << "error: no object with this name.\n";
    return 1;
  }

  occ::handle<PrsDim_Dimension> aDim = occ::down_cast<PrsDim_Dimension>(anObject);
  if (aDim.IsNull())
  {
    theDi << theArgVec[0] << "error: no dimension with this name.\n";
    return 1;
  }

  occ::handle<Prs3d_DimensionAspect> anAspect = aDim->DimensionAspect();
  if (ParseAngleDimensionParams(theArgNum, theArgVec, 2, aStringParams))
  {
    return 1;
  }

  SetAngleDimensionParams(aDim, aStringParams);

  if (!aDim->IsValid())
  {
    Message::SendFail("Error: Dimension geometry or plane is not valid");
    return 1;
  }

  // Redisplay a dimension after parameter changing.
  if (ViewerTest::GetAISContext()->IsDisplayed(aDim))
  {
    ViewerTest::GetAISContext()->Redisplay(aDim, toUpdate);
  }
  return 0;
}

//=======================================================================
// function : VMoveDim
// purpose  : Moves dimension or relation text label to defined or picked
//           position and updates the object.
// draw args: vmovedim [name] [x y z]
//=======================================================================
static int VMoveDim(Draw_Interpretor& theDi, int theArgNum, const char** theArgVec)
{
  if (theArgNum > 5)
  {
    theDi << theArgVec[0] << " error: the wrong number of parameters.\n";
    return 1;
  }

  // Parameters parsing
  bool isNameSet  = (theArgNum == 2 || theArgNum == 5);
  bool isPointSet = (theArgNum == 4 || theArgNum == 5);

  occ::handle<AIS_InteractiveObject> aPickedObj;
  gp_Pnt                             aPoint(gp::Origin());
  int                                aMaxPickNum = 5;

  // Find object
  if (isNameSet)
  {
    TCollection_AsciiString aName(theArgVec[1]);
    if (!GetMapOfAIS().Find2(aName, aPickedObj) || aPickedObj.IsNull())
    {
      theDi << theArgVec[0] << " error: no object with this name.\n";
      return 1;
    }

    if (aPickedObj->Type() != AIS_KindOfInteractive_Dimension
        && aPickedObj->Type() != AIS_KindOfInteractive_Relation)
    {
      theDi << theArgVec[0] << " error: no dimension or relation with this name.\n";
      return 1;
    }
  }
  else // Pick dimension or relation
  {
    // Loop that will be handle picking.
    int          anArgNum  = 5;
    const char*  aBuffer[] = {"VPick", "X", "VPickY", "VPickZ", "VPickShape"};
    const char** anArgVec  = (const char**)aBuffer;

    bool isPicked = false;
    int  aPickNum = 0;
    while (!isPicked && aPickNum < aMaxPickNum)
    {
      while (ViewerMainLoop(anArgNum, anArgVec))
      {
      }

      for (TheAISContext()->InitSelected(); TheAISContext()->MoreSelected();
           TheAISContext()->NextSelected())
      {
        aPickedObj = TheAISContext()->SelectedInteractive();
      }

      isPicked = (!aPickedObj.IsNull()
                  && (aPickedObj->Type() == AIS_KindOfInteractive_Dimension
                      || aPickedObj->Type() == AIS_KindOfInteractive_Relation));
      if (isPicked)
      {
        break;
      }
      aPickNum++;
    }
    if (!isPicked)
    {
      theDi << theArgVec[0] << ": no dimension or relation is selected.\n";
      return 1;
    }
  }

  // Find point
  if (isPointSet)
  {
    aPoint = theArgNum == 4 ? gp_Pnt(atoi(theArgVec[1]), atoi(theArgVec[2]), atoi(theArgVec[3]))
                            : gp_Pnt(atoi(theArgVec[2]), atoi(theArgVec[3]), atoi(theArgVec[4]));
  }
  else // Pick the point
  {
    int          aPickArgNum = 5;
    const char*  aPickBuff[] = {"VPick", "X", "VPickY", "VPickZ", "VPickShape"};
    const char** aPickArgVec = (const char**)aPickBuff;

    while (ViewerMainLoop(aPickArgNum, aPickArgVec))
    {
    }

    // Set text position, update relation or dimension.
    if (aPickedObj->Type() == AIS_KindOfInteractive_Relation)
    {
      occ::handle<PrsDim_Relation> aRelation = occ::down_cast<PrsDim_Relation>(aPickedObj);
      aPoint                                 = Get3DPointAtMousePosition();
      aRelation->SetPosition(aPoint);
      TheAISContext()->Redisplay(aRelation, true);
    }
    else
    {
      occ::handle<PrsDim_Dimension> aDim = occ::down_cast<PrsDim_Dimension>(aPickedObj);
      gp_Pnt                        aFirstPoint, aSecondPoint;
      if (aDim->KindOfDimension() == PrsDim_KOD_PLANEANGLE)
      {
        occ::handle<PrsDim_AngleDimension> anAngleDim = occ::down_cast<PrsDim_AngleDimension>(aDim);
        aFirstPoint                                   = anAngleDim->FirstPoint();
        aSecondPoint                                  = anAngleDim->SecondPoint();
      }
      else if (aDim->KindOfDimension() == PrsDim_KOD_LENGTH)
      {
        occ::handle<PrsDim_LengthDimension> aLengthDim =
          occ::down_cast<PrsDim_LengthDimension>(aDim);
        aFirstPoint  = aLengthDim->FirstPoint();
        aSecondPoint = aLengthDim->SecondPoint();
      }
      else if (aDim->KindOfDimension() == PrsDim_KOD_RADIUS)
      {
        occ::handle<PrsDim_RadiusDimension> aRadiusDim =
          occ::down_cast<PrsDim_RadiusDimension>(aDim);
        aFirstPoint  = aRadiusDim->AnchorPoint();
        aSecondPoint = aRadiusDim->Circle().Location();
      }
      else if (aDim->KindOfDimension() == PrsDim_KOD_DIAMETER)
      {
        occ::handle<PrsDim_DiameterDimension> aDiameterDim =
          occ::down_cast<PrsDim_DiameterDimension>(aDim);
        aFirstPoint  = aDiameterDim->AnchorPoint();
        aSecondPoint = aDiameterDim->Circle().Location();
      }

      if (!Get3DPointAtMousePosition(aFirstPoint, aSecondPoint, aPoint))
      {
        return 1;
      }

      aDim->SetTextPosition(aPoint);
      TheAISContext()->Redisplay(aDim, true);
    }
  }

  // Set text position, update relation or dimension.
  if (occ::handle<PrsDim_Relation> aRelation = occ::down_cast<PrsDim_Relation>(aPickedObj))
  {
    aRelation->SetPosition(aPoint);
    TheAISContext()->Redisplay(aRelation, true);
  }
  else
  {
    occ::handle<PrsDim_Dimension> aDim = occ::down_cast<PrsDim_Dimension>(aPickedObj);
    aDim->SetTextPosition(aPoint);
    TheAISContext()->Redisplay(aDim, true);
  }

  return 0;
}

//=================================================================================================

void ViewerTest::RelationCommands(Draw_Interpretor& theCommands)
{
  const char* aGroup    = "AIS Viewer";
  const char* aFileName = __FILE__;
  auto        addCmd =
    [&](const char* theName, Draw_Interpretor::CommandFunction theFunc, const char* theHelp) {
      theCommands.Add(theName, theHelp, aFileName, theFunc, aGroup);
    };

  addCmd("vdimension", VDimBuilder, /* [vdimension] */ R"(
vdimension name {-angle|-length|-radius|-diameter}
    [-shapes shape1 [shape2 [shape3]]
    [-selected]
    [-text 3d|2d wf|sh|wireframe|shading IntegerSize]
    [-font FontName]
    [-label left|right|hcenter|hfit top|bottom|vcenter|vfit]
    [-arrow external|internal|fit]
    [-zoomablearrow]
    [{-arrowlength|-arlen} RealArrowLength]
    [{-arrowangle|-arangle} ArrowAngle(degrees)]
    [-plane xoy|yoz|zox]
    [-flyout FloatValue -extension FloatValue]
    [-autovalue]
    [-value CustomRealValue]
    [-textvalue CustomTextValue]
    [-dispunits DisplayUnitsString]
    [-modelunits ModelUnitsString]
    [-showunits | -hideunits]
Builds angle, length, radius and diameter dimensions.
See also: vdimparam, vmovedim.
)" /* [vdimension] */);

  addCmd("vrelation", VRelationBuilder, /* [vrelation] */ R"(
vrelation name {-concentric|-equaldistance|-equalradius|-fix|
                -identic|-offset|-parallel|-perpendicular|-tangent|-symmetric}
Builds specific relation from selected objects:
 -concentric    - 2 circled edges
 -equaldistance - 4 vertex/edges
 -equalradius   - 1 or 2 circled edges
 -fix           - 1 edge
 -identic       - 2 faces, edges or vertices
 -offset        - 2 faces
 -parallel      - 2 faces or 2 edges
 -perpendicular - 2 faces or 2 edges
 -tangent       - two coplanar edges (first the circular edge then the tangent edge) or two faces
 -symmetric     - 3 edges or 1 edge and 2 vertices
)" /* [vrelation] */);

  addCmd("vdimparam", VDimParam, /* [vdimparam] */ R"(
vdimparam name
    [-text 3d|2d wf|sh|wireframe|shading IntegerSize]
    [-font FontName]
    [-label left|right|hcenter|hfit top|bottom|vcenter|vfit]
    [-arrow external|internal|fit]
    [-zoomablearrow 0|1]
    [{-arrowlength|-arlen} RealArrowLength]
    [{-arrowangle|-arangle} ArrowAngle(degrees)]
    [-plane xoy|yoz|zox]
    [-flyout FloatValue -extension FloatValue]
    [-value CustomNumberValue]
    [-textvalue CustomTextValue]
    [-dispunits DisplayUnitsString]
    [-modelunits ModelUnitsString]
    [-showunits | -hideunits]
Sets parameters for angle, length, radius and diameter dimensions.
See also: vmovedim, vdimension.
)" /* [vdimparam] */);

  addCmd("vlengthparam", VLengthParam, /* [vlengthparam] */ R"(
vlengthparam name [-direction {ox|oy|oz|x y z|autodirection}]
Sets parameters for length dimension.
See also: vdimparam, vdimension.
)" /* [vlengthparam] */);

  addCmd("vangleparam", VAngleParam, /* [vangleparam] */ R"(
vangleparam name [-type interior|exterior]
            [-showarrow first|second|both|none]
Sets parameters for angle dimension.
See also: vdimparam, vdimension.
)" /* [vangleparam] */);

  addCmd("vmovedim", VMoveDim, /* [vmovedim] */ R"(
vmovedim [name] [x y z]
Moves picked or named (if name defined)
dimension to picked mouse position or input point.
Text label of dimension 'name' is moved to position, another parts of dimension are adjusted.
)" /* [vmovedim] */);
}