[occt.git] / src / V3d / V3d_PositionLight.cxx

// 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.

/***********************************************************************
 
  V3d_PositionLight.cxx
  Created:    30-03-98  ZOV (ZELENKOV Oleg)

************************************************************************/

#include <V3d.hxx>
#include <V3d_PositionLight.ixx>
#include <Graphic3d_Vector.hxx>
#include <Graphic3d_Vertex.hxx>
#include <Graphic3d_Structure.hxx>
#include <Graphic3d_Group.hxx>
#include <Graphic3d_ArrayOfSegments.hxx>
#include <Graphic3d_AspectMarker3d.hxx>
#include <Graphic3d_AspectLine3d.hxx>
#include <Graphic3d_AspectText3d.hxx>
#include <V3d_SpotLight.hxx>
#include <Visual3d_Light.hxx>
#include <Visual3d_ViewManager.hxx>
#include <Visual3d_ContextPick.hxx>
#include <V3d_BadValue.hxx>
#include <gp_Dir.hxx>
#include <gp_Ax1.hxx>
#include <gp_Vec.hxx>
#include <gp_Pnt.hxx>
#include <gp_Trsf.hxx>
#include <TCollection_AsciiString.hxx>

V3d_PositionLight::V3d_PositionLight(const Handle(V3d_Viewer)& VM) : V3d_Light(VM) {
}

void V3d_PositionLight::SetTarget(const Standard_Real X, const Standard_Real Y, const Standard_Real Z) {

  Standard_Real Xc,Yc,Zc, Xp,Yp,Zp;
  
  // Recalculation of the position
  MyTarget.Coord(Xc,Yc,Zc);
  Position (Xp,Yp,Zp) ;

  Xp = Xp + (X - Xc);
  Yp = Yp + (Y - Yc);
  Zp = Zp + (Z - Zc);

  // Affectation
  MyTarget.SetCoord(X,Y,Z);
  SetPosition(Xp,Yp,Zp) ;
}

void V3d_PositionLight::SetRadius(const Standard_Real Radius) {

  V3d_BadValue_Raise_if( Radius <= 0. , "V3d_PositionLight::SetRadius, bad radius");
  V3d_BadValue_Raise_if( MyType == V3d_DIRECTIONAL , "V3d_PositionLight::SetRadius, bad light type");

  Standard_Real X0,Y0,Z0, Xn,Yn,Zn, Xp,Yp,Zp;
  
  // The target point remains unchanged, only the position of the light is modified
  // by preserving the direction.
	Position (Xp,Yp,Zp);
  Graphic3d_Vector  D(MyTarget, Graphic3d_Vertex(Xp, Yp, Zp));
  D.Normalize();
  D.Coord(Xn,Yn,Zn);
  MyTarget.Coord(X0,Y0,Z0);
  Xn = X0 + Radius*Xn;
  Yn = Y0 + Radius*Yn;
  Zn = Z0 + Radius*Zn;

  SetPosition(Xn,Yn,Zn) ;
}

void V3d_PositionLight::OnHideFace(const Handle(V3d_View)& aView) {

  Standard_Real Xp,Yp,Zp, X,Y,Z, VX,VY,VZ;
  
  Position (Xp,Yp,Zp);
	V3d_Light::SymetricPointOnSphere (aView, 
		MyTarget, Graphic3d_Vertex(Xp,Yp,Yp), Radius(), X,Y,Z, VX,VY,VZ);

  // This is a visible point
  if ((VX*(X-Xp) < 0.) && (VY*(Y-Yp) < 0.) && (VZ*(Z-Zp) < 0.))
    SetPosition (X,Y,Z);
}

void V3d_PositionLight::OnSeeFace(const Handle(V3d_View)& aView) {

  Standard_Real Xp,Yp,Zp, X,Y,Z, VX,VY,VZ;
  
  Position (Xp,Yp,Zp);
	V3d_Light::SymetricPointOnSphere (aView, 
		MyTarget, Graphic3d_Vertex(Xp,Yp,Yp), Radius(), X,Y,Z, VX,VY,VZ);

  // This is a hidden point
  if ((VX*(X-Xp) > 0.) && (VY*(Y-Yp) > 0.) && (VZ*(Z-Zp) > 0.))
    SetPosition (X,Y,Z);
}

Standard_Boolean V3d_PositionLight::SeeOrHide(const Handle(V3d_View)& aView) const {

  Standard_Real Xp,Yp,Zp, X,Y,Z, VX,VY,VZ;
  
  Position (Xp,Yp,Zp);
	V3d_Light::SymetricPointOnSphere (aView, 
		MyTarget, Graphic3d_Vertex(Xp,Yp,Yp), Radius(), X,Y,Z, VX,VY,VZ);

  // Is it a visible or a hidden point
  return ( (VX*(X-Xp) > 0.) || (VY*(Y-Yp) > 0.) || (VZ*(Z-Zp) > 0.) )?
    // the source is on the hidden face 
    Standard_False:
    // the source is on the visible face.
    Standard_True;
}

void V3d_PositionLight::Target(Standard_Real& Xp, Standard_Real& Yp, Standard_Real& Zp)const  {
  
  MyTarget.Coord(Xp,Yp,Zp) ;
}

void V3d_PositionLight::Display( const Handle(V3d_View)& aView,
                                    const V3d_TypeOfRepresentation TPres )
{
  Graphic3d_Vertex PText ;
  Standard_Real X,Y,Z,Rayon;
  Standard_Real X0,Y0,Z0,VX,VY,VZ;
  Standard_Real X1,Y1,Z1;
  Standard_Real DXRef,DYRef,DZRef,DXini,DYini,DZini;
  Standard_Real R1,G1,B1;
  V3d_TypeOfRepresentation Pres;
  V3d_TypeOfUpdate UpdSov;

//  Creation of a structure of markable elements (position of the
//  light, and the domain of lighting represented by a circle)
//  Creation of a structure snopick of non-markable elements (target, meridian and 
//  parallel).

  Pres = TPres;
  Handle(V3d_Viewer) TheViewer = aView->Viewer();
  UpdSov = TheViewer->UpdateMode();
  TheViewer->SetUpdateMode(V3d_WAIT);
  if (!MyGraphicStructure.IsNull()) {
    MyGraphicStructure->Disconnect(MyGraphicStructure1);
    MyGraphicStructure->Clear();
    MyGraphicStructure1->Clear();
    if (Pres == V3d_SAMELAST) Pres = MyTypeOfRepresentation;
  }
  else {
    if (Pres == V3d_SAMELAST) Pres = V3d_SIMPLE;
    Handle(Graphic3d_Structure) slight = new Graphic3d_Structure(TheViewer->Viewer());
    MyGraphicStructure = slight;
    Handle(Graphic3d_Structure) snopick = new Graphic3d_Structure(TheViewer->Viewer()); 
    MyGraphicStructure1 = snopick;
  }

  Handle(Graphic3d_Group) gradius, gExtArrow, gIntArrow;
  if (MyType != V3d_DIRECTIONAL
   && Pres == V3d_COMPLETE)
  {
    gradius   = MyGraphicStructure->NewGroup();
    gExtArrow = MyGraphicStructure->NewGroup();
    gIntArrow = MyGraphicStructure->NewGroup();
  }
  Handle(Graphic3d_Group) glight = MyGraphicStructure->NewGroup();
  Handle(Graphic3d_Group) gsphere;
  if (Pres == V3d_COMPLETE
   || Pres == V3d_PARTIAL)
  {
    gsphere = MyGraphicStructure->NewGroup();
  }
  
  Handle(Graphic3d_Group) gnopick = MyGraphicStructure1->NewGroup();
  
  X0 = MyTarget.X();
  Y0 = MyTarget.Y();
  Z0 = MyTarget.Z();
  
// Display of the light position.

  this->Color(Quantity_TOC_RGB,R1,G1,B1);
  Quantity_Color Col1(R1,G1,B1,Quantity_TOC_RGB);
  Handle(Graphic3d_AspectLine3d) Asp1 = new Graphic3d_AspectLine3d();
  Asp1->SetColor(Col1);
  glight->SetPrimitivesAspect(Asp1);
  this->Symbol(glight,aView);

// Display of the marking sphere (limit at the circle).

  if (Pres == V3d_COMPLETE || Pres == V3d_PARTIAL) {
      
    Rayon = this->Radius();
    aView->Proj(VX,VY,VZ);
    V3d::CircleInPlane(gsphere,X0,Y0,Z0,VX,VY,VZ,Rayon);

    if (MyType != V3d_DIRECTIONAL) {

      //Display of the radius of the sphere (line + text)

      if (Pres == V3d_COMPLETE) {
        this->Position(X,Y,Z);
        Handle(Graphic3d_ArrayOfSegments) aPrims = new Graphic3d_ArrayOfSegments(2);
        aPrims->AddVertex(X0,Y0,Z0);
        aPrims->AddVertex(X,Y,Z);
        gnopick->AddPrimitiveArray(aPrims);
        V3d::ArrowOfRadius(gExtArrow,X-.1*(X-X0),Y-.1*(Y-Y0),Z-.1*(Z-Z0),X-X0,Y-Y0,Z-Z0,M_PI/15.,Rayon/20.);
        V3d::ArrowOfRadius(gIntArrow,X0,Y0,Z0,X0-X,Y0-Y,Z0-Z,M_PI/15.,Rayon/20.);
        TCollection_AsciiString ValOfRadius(Rayon);
        PText.SetCoord( .5*(X0+X), .5*(Y0+Y), .5*(Z0+Z) );
        gradius->Text(ValOfRadius.ToCString(),PText,0.01);
      }
    }

    // Display of the meridian

    Quantity_Color Col2(Quantity_NOC_GREEN);
    Handle(Graphic3d_AspectLine3d) Asp2 = new Graphic3d_AspectLine3d(Col2,Aspect_TOL_SOLID,1.);
    gnopick->SetPrimitivesAspect(Asp2);
    
    // Definition of the axis of circle
    aView->Up(DXRef,DYRef,DZRef);
    this->Position(X,Y,Z);
    DXini = X-X0; DYini = Y-Y0; DZini = Z-Z0;
    VX = DYRef*DZini - DZRef*DYini;
    VY = DZRef*DXini - DXRef*DZini;
    VZ = DXRef*DYini - DYRef*DXini;
    
    V3d::CircleInPlane(gnopick,X0,Y0,Z0,VX,VY,VZ,Rayon);
      
    // Display of the parallel

    // Definition of the axis of circle
    aView->Proj(VX,VY,VZ);
    aView->Up(X1,Y1,Z1);
    DXRef = VY * Z1 - VZ * Y1;
    DYRef = VZ * X1 - VX * Z1;
    DZRef = VX * Y1 - VY * X1;
    this->Position(X,Y,Z);
    DXini = X-X0; DYini = Y-Y0; DZini = Z-Z0;
    VX = DYRef*DZini - DZRef*DYini;
    VY = DZRef*DXini - DXRef*DZini;
    VZ = DXRef*DYini - DYRef*DXini;
    
    V3d::CircleInPlane(gnopick,X0,Y0,Z0,VX,VY,VZ,Rayon);
  }

  MyGraphicStructure->Connect(MyGraphicStructure1,Graphic3d_TOC_DESCENDANT);
  MyTypeOfRepresentation = Pres;
  MyGraphicStructure->Display();
  TheViewer->SetUpdateMode(UpdSov);
}


void V3d_PositionLight::Tracking( const Handle(V3d_View)& aView,
			  const V3d_TypeOfPickLight WhatPick,
			  const Standard_Integer Xpix,
			  const Standard_Integer Ypix) {

//  Quantity_Color   Col ;
  Standard_Real    xPos, yPos, zPos;
  Standard_Real    XPp,YPp,PXT,PYT,X,Y,Z,Rayon,Ylim;
  Standard_Real    XMinTrack,XMaxTrack,YMinTrack,YMaxTrack;
  Standard_Real    XT,YT,ZT,X0,Y0,Z0,XP,YP,ZP,VX,VY,VZ,A,B,C,Delta;
  Standard_Real    DX,DY,PXP,PYP,Xproj,Yproj;
  Standard_Real    A1,A2,B1,B2,Rap,OldRprj,NewRprj;
  Standard_Real    Xi,Yi,Zi,DeltaX,DeltaY,DeltaZ,Lambda;
  Standard_Integer IPX,IPY;
  
  aView->Convert(Xpix,Ypix,XPp,YPp);
  X0 = MyTarget.X();
  Y0 = MyTarget.Y();
  Z0 = MyTarget.Z();
  aView->Project(X0,Y0,Z0,PXT,PYT);
  aView->Convert(PXT,PYT,IPX,IPY);
//      Coord 3d in the plane of projection of the target.
  aView->Convert(IPX,IPY,XT,YT,ZT);
  switch (WhatPick) {
  case V3d_POSITIONLIGHT :
	  // The Coordinates should remain inside of the sphere
    Rayon = Radius();
    XMinTrack = PXT - Rayon;
    XMaxTrack = PXT + Rayon;
    Ylim = Sqrt( Square(Rayon) - Square(XPp - PXT) );
    YMinTrack = PYT - Ylim;
    YMaxTrack = PYT + Ylim;
    if (XPp >= XMinTrack && XPp <= XMaxTrack) {
      if (YPp >= YMinTrack && YPp <= YMaxTrack) {
				aView->ProjReferenceAxe(Xpix,Ypix,XP,YP,ZP,VX,VY,VZ);
	DeltaX = X0 - XP;
	DeltaY = Y0 - YP;
	DeltaZ = Z0 - ZP;
	
//      The point of intersection of straight lines defined by :
//      - Straight line passing by the point of projection and the eye
//        if this is a perspective, parralel to the normal of the view 
//        if this is an axonometric view.
//        position in the view is parallel to the normal of the view
//      - The distance position of the target camera is equal to the radius.

	A = VX*VX + VY*VY + VZ*VZ ;
	B = -2. * (VX*DeltaX + VY*DeltaY + VZ*DeltaZ);
	C = DeltaX*DeltaX + DeltaY*DeltaY + DeltaZ*DeltaZ 
	  - Rayon*Rayon ;
	Delta = B*B - 4.*A*C;
	if ( Delta >= 0 ) {
	  Lambda = (-B + Sqrt(Delta))/(2.*A);
	  X = XP + Lambda*VX;
	  Y = YP + Lambda*VY;
	  Z = ZP + Lambda*VZ;
	  SetPosition(X,Y,Z);

		if (MyType == V3d_SPOT)
	    ((V3d_SpotLight*)this)->SetDirection(X0-X,Y0-Y,Z0-Z);

	  Display(aView,MyTypeOfRepresentation);
	  (aView->Viewer())->UpdateLights();
	}
      }
    }
    break;

  case V3d_SPACELIGHT :
    aView->Convert(PXT,PYT,IPX,IPY);
//               In this case Xpix,Ypix correspond to a distance, relative
//               to the translation that is planned to be performed on the sphere. 
    aView->Convert(IPX+Xpix,IPY+Ypix,X,Y,Z);
    X = X+X0-XT;
    Y = Y+Y0-YT; 
    Z = Z+Z0-ZT;
    SetTarget(X,Y,Z);
    Display(aView,MyTypeOfRepresentation);
    (aView->Viewer())->UpdateLights();
    break;

  case V3d_ExtRADIUSLIGHT :
		if (MyType == V3d_DIRECTIONAL)
			break;
//             it is attempted to preserve the target direction position of the  
//             source ==> the point is projected on the target source direction.
    this->Position(Xi,Yi,Zi);
    aView->Project(Xi,Yi,Zi,PXP,PYP);
    DX = PXP - PXT;
    DY = PYP - PYT;
    A1 = DY/DX ; B1 = PYT - A1*PXT;
    A2 = -DX/DY; B2 = YPp - A2*XPp;
    Xproj = (B2 - B1) / (A1 - A2);
    Yproj = A1*Xproj + B1;
    if ( (DX*(Xproj-PXT) > 0.) && (DY*(Yproj-PYT) > 0.) ) {
      OldRprj = Sqrt ( Square (PXP-PXT) + Square (PYP-PYT) );
      NewRprj = Sqrt ( Square (Xproj-PXT) + Square (Yproj-PYT) );
      Rap = NewRprj/OldRprj;
      Rayon = Radius();
      Rayon = Rayon * Rap;
      SetRadius(Rayon);
      Display(aView,MyTypeOfRepresentation);
      (aView->Viewer())->UpdateLights();
    }
    break;

  case V3d_IntRADIUSLIGHT :
		if (MyType == V3d_DIRECTIONAL)
			break;
//             it is attempted to preserve the target direction position of the  
//             source ==> the point is projected on the target source direction.
    Position(Xi,Yi,Zi);
    aView->Project(Xi,Yi,Zi,PXP,PYP);
    DX = PXP - PXT;
    DY = PYP - PYT;
    A1 = DY/DX ; B1 = PYT - A1*PXT;
    A2 = -DX/DY; B2 = YPp - A2*XPp;
    Xproj = (B2 - B1) / (A1 - A2);
    Yproj = A1*Xproj + B1;
    if ( (DX*(Xproj-PXP) < 0.) && (DY*(Yproj-PYP) < 0.) ) {
      OldRprj = Sqrt ( Square (PXP-PXT) + Square (PYP-PYT) );
      NewRprj = Sqrt ( Square (Xproj-PXP) + Square (Yproj-PYP) );
      Rap = NewRprj/OldRprj;
      Rayon = Radius();
      Rayon = Rayon * Rap;
//                 the source should remain at a fixed position, 
//                 only the target is modified.
      Position (xPos, yPos, zPos);
      Graphic3d_Vector  Dir(Graphic3d_Vertex(xPos,yPos,zPos), MyTarget);
      Dir.Normalize();
      Dir.Coord(X,Y,Z);
      X = Xi + Rayon*X;
      Y = Yi + Rayon*Y;
      Z = Zi + Rayon*Z;
//                 the source should remain at a fixed position, 
//                 only the target is modified.
      MyTarget.SetCoord(X,Y,Z);
      Display(aView,MyTypeOfRepresentation);		 
      (aView->Viewer())->UpdateLights();
    }
		break;

  case V3d_RADIUSTEXTLIGHT :
    break;

  case V3d_NOTHING : 
    break;
  }
}

Standard_Real V3d_PositionLight::Radius() const {

  Standard_Real  Xp,Yp,Zp, Xc,Yc,Zc;
  
  Position (Xp,Yp,Zp);
  MyTarget.Coord(Xc,Yc,Zc);

  return Sqrt (Square(Xc - Xp) + Square(Yc - Yp) + Square(Zc - Zp));
}

void V3d_PositionLight::Erase() {

  if (!MyGraphicStructure.IsNull()) MyGraphicStructure->Erase();
  if (!MyGraphicStructure1.IsNull()) MyGraphicStructure1->Erase();
}
Commit	Line	Data
973c2be1	1	// Copyright (c) 1999-2014 OPEN CASCADE SAS
b311480e	2	//
973c2be1	3	// This file is part of Open CASCADE Technology software library.
b311480e	4	//
d5f74e42	5	// This library is free software; you can redistribute it and/or modify it under
d5f74e42	6	// the terms of the GNU Lesser General Public License version 2.1 as published
973c2be1	7	// by the Free Software Foundation, with special exception defined in the file
	8	// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
	9	// distribution for complete text of the license and disclaimer of any warranty.
b311480e	10	//
973c2be1	11	// Alternatively, this file may be used under the terms of Open CASCADE
973c2be1	12	// commercial license or contractual agreement.
b311480e	13
7fd59977	14	/***********************************************************************
	15
	16	V3d_PositionLight.cxx
	17	Created: 30-03-98 ZOV (ZELENKOV Oleg)
	18
	19	************************************************************************/
	20
	21	#include <V3d.hxx>
	22	#include <V3d_PositionLight.ixx>
	23	#include <Graphic3d_Vector.hxx>
	24	#include <Graphic3d_Vertex.hxx>
	25	#include <Graphic3d_Structure.hxx>
	26	#include <Graphic3d_Group.hxx>
b8ddfc2f	27	#include <Graphic3d_ArrayOfSegments.hxx>
7fd59977	28	#include <Graphic3d_AspectMarker3d.hxx>
	29	#include <Graphic3d_AspectLine3d.hxx>
	30	#include <Graphic3d_AspectText3d.hxx>
	31	#include <V3d_SpotLight.hxx>
	32	#include <Visual3d_Light.hxx>
	33	#include <Visual3d_ViewManager.hxx>
	34	#include <Visual3d_ContextPick.hxx>
6942f04a	35	#include <V3d_BadValue.hxx>
7fd59977	36	#include <gp_Dir.hxx>
	37	#include <gp_Ax1.hxx>
	38	#include <gp_Vec.hxx>
	39	#include <gp_Pnt.hxx>
	40	#include <gp_Trsf.hxx>
	41	#include <TCollection_AsciiString.hxx>
7fd59977	42
	43	V3d_PositionLight::V3d_PositionLight(const Handle(V3d_Viewer)& VM) : V3d_Light(VM) {
	44	}
	45
	46	void V3d_PositionLight::SetTarget(const Standard_Real X, const Standard_Real Y, const Standard_Real Z) {
	47
	48	Standard_Real Xc,Yc,Zc, Xp,Yp,Zp;
	49
81bba717	50	// Recalculation of the position
7fd59977	51	MyTarget.Coord(Xc,Yc,Zc);
	52	Position (Xp,Yp,Zp) ;
	53
	54	Xp = Xp + (X - Xc);
	55	Yp = Yp + (Y - Yc);
	56	Zp = Zp + (Z - Zc);
	57
	58	// Affectation
	59	MyTarget.SetCoord(X,Y,Z);
	60	SetPosition(Xp,Yp,Zp) ;
	61	}
	62
	63	void V3d_PositionLight::SetRadius(const Standard_Real Radius) {
	64
6942f04a	65	V3d_BadValue_Raise_if( Radius <= 0. , "V3d_PositionLight::SetRadius, bad radius");
6942f04a	66	V3d_BadValue_Raise_if( MyType == V3d_DIRECTIONAL , "V3d_PositionLight::SetRadius, bad light type");
7fd59977	67
	68	Standard_Real X0,Y0,Z0, Xn,Yn,Zn, Xp,Yp,Zp;
	69
81bba717	70	// The target point remains unchanged, only the position of the light is modified
81bba717	71	// by preserving the direction.
7fd59977	72	Position (Xp,Yp,Zp);
	73	Graphic3d_Vector D(MyTarget, Graphic3d_Vertex(Xp, Yp, Zp));
	74	D.Normalize();
	75	D.Coord(Xn,Yn,Zn);
	76	MyTarget.Coord(X0,Y0,Z0);
	77	Xn = X0 + Radius*Xn;
	78	Yn = Y0 + Radius*Yn;
	79	Zn = Z0 + Radius*Zn;
	80
	81	SetPosition(Xn,Yn,Zn) ;
	82	}
	83
	84	void V3d_PositionLight::OnHideFace(const Handle(V3d_View)& aView) {
	85
	86	Standard_Real Xp,Yp,Zp, X,Y,Z, VX,VY,VZ;
	87
	88	Position (Xp,Yp,Zp);
	89	V3d_Light::SymetricPointOnSphere (aView,
	90	MyTarget, Graphic3d_Vertex(Xp,Yp,Yp), Radius(), X,Y,Z, VX,VY,VZ);
	91
81bba717	92	// This is a visible point
7fd59977	93	if ((VX(X-Xp) < 0.) && (VY(Y-Yp) < 0.) && (VZ*(Z-Zp) < 0.))
	94	SetPosition (X,Y,Z);
	95	}
	96
	97	void V3d_PositionLight::OnSeeFace(const Handle(V3d_View)& aView) {
	98
	99	Standard_Real Xp,Yp,Zp, X,Y,Z, VX,VY,VZ;
	100
	101	Position (Xp,Yp,Zp);
	102	V3d_Light::SymetricPointOnSphere (aView,
	103	MyTarget, Graphic3d_Vertex(Xp,Yp,Yp), Radius(), X,Y,Z, VX,VY,VZ);
	104
81bba717	105	// This is a hidden point
7fd59977	106	if ((VX(X-Xp) > 0.) && (VY(Y-Yp) > 0.) && (VZ*(Z-Zp) > 0.))
	107	SetPosition (X,Y,Z);
	108	}
	109
	110	Standard_Boolean V3d_PositionLight::SeeOrHide(const Handle(V3d_View)& aView) const {
	111
	112	Standard_Real Xp,Yp,Zp, X,Y,Z, VX,VY,VZ;
	113
	114	Position (Xp,Yp,Zp);
	115	V3d_Light::SymetricPointOnSphere (aView,
	116	MyTarget, Graphic3d_Vertex(Xp,Yp,Yp), Radius(), X,Y,Z, VX,VY,VZ);
	117
81bba717	118	// Is it a visible or a hidden point
7fd59977	119	return ( (VX(X-Xp) > 0.) \|\| (VY(Y-Yp) > 0.) \|\| (VZ*(Z-Zp) > 0.) )?
81bba717	120	// the source is on the hidden face
7fd59977	121	Standard_False:
81bba717	122	// the source is on the visible face.
7fd59977	123	Standard_True;
	124	}
	125
	126	void V3d_PositionLight::Target(Standard_Real& Xp, Standard_Real& Yp, Standard_Real& Zp)const {
	127
	128	MyTarget.Coord(Xp,Yp,Zp) ;
	129	}
	130
	131	void V3d_PositionLight::Display( const Handle(V3d_View)& aView,
b8ddfc2f	132	const V3d_TypeOfRepresentation TPres )
b8ddfc2f	133	{
7fd59977	134	Graphic3d_Vertex PText ;
	135	Standard_Real X,Y,Z,Rayon;
	136	Standard_Real X0,Y0,Z0,VX,VY,VZ;
	137	Standard_Real X1,Y1,Z1;
	138	Standard_Real DXRef,DYRef,DZRef,DXini,DYini,DZini;
	139	Standard_Real R1,G1,B1;
	140	V3d_TypeOfRepresentation Pres;
	141	V3d_TypeOfUpdate UpdSov;
	142
81bba717	143	// Creation of a structure of markable elements (position of the
	144	// light, and the domain of lighting represented by a circle)
	145	// Creation of a structure snopick of non-markable elements (target, meridian and
	146	// parallel).
	147
b8ddfc2f	148	Pres = TPres;
	149	Handle(V3d_Viewer) TheViewer = aView->Viewer();
	150	UpdSov = TheViewer->UpdateMode();
	151	TheViewer->SetUpdateMode(V3d_WAIT);
	152	if (!MyGraphicStructure.IsNull()) {
	153	MyGraphicStructure->Disconnect(MyGraphicStructure1);
	154	MyGraphicStructure->Clear();
	155	MyGraphicStructure1->Clear();
	156	if (Pres == V3d_SAMELAST) Pres = MyTypeOfRepresentation;
	157	}
	158	else {
	159	if (Pres == V3d_SAMELAST) Pres = V3d_SIMPLE;
	160	Handle(Graphic3d_Structure) slight = new Graphic3d_Structure(TheViewer->Viewer());
	161	MyGraphicStructure = slight;
	162	Handle(Graphic3d_Structure) snopick = new Graphic3d_Structure(TheViewer->Viewer());
	163	MyGraphicStructure1 = snopick;
	164	}
	165
b64d84be	166	Handle(Graphic3d_Group) gradius, gExtArrow, gIntArrow;
	167	if (MyType != V3d_DIRECTIONAL
	168	&& Pres == V3d_COMPLETE)
	169	{
	170	gradius = MyGraphicStructure->NewGroup();
	171	gExtArrow = MyGraphicStructure->NewGroup();
	172	gIntArrow = MyGraphicStructure->NewGroup();
b8ddfc2f	173	}
b64d84be	174	Handle(Graphic3d_Group) glight = MyGraphicStructure->NewGroup();
7fd59977	175	Handle(Graphic3d_Group) gsphere;
b64d84be	176	if (Pres == V3d_COMPLETE
	177	\|\| Pres == V3d_PARTIAL)
	178	{
	179	gsphere = MyGraphicStructure->NewGroup();
	180	}
7fd59977	181
b64d84be	182	Handle(Graphic3d_Group) gnopick = MyGraphicStructure1->NewGroup();
7fd59977	183
	184	X0 = MyTarget.X();
	185	Y0 = MyTarget.Y();
	186	Z0 = MyTarget.Z();
	187
81bba717	188	// Display of the light position.
7fd59977	189
7fd59977	190	this->Color(Quantity_TOC_RGB,R1,G1,B1);
	191	Quantity_Color Col1(R1,G1,B1,Quantity_TOC_RGB);
	192	Handle(Graphic3d_AspectLine3d) Asp1 = new Graphic3d_AspectLine3d();
	193	Asp1->SetColor(Col1);
	194	glight->SetPrimitivesAspect(Asp1);
	195	this->Symbol(glight,aView);
	196
81bba717	197	// Display of the marking sphere (limit at the circle).
7fd59977	198
	199	if (Pres == V3d_COMPLETE \|\| Pres == V3d_PARTIAL) {
	200
	201	Rayon = this->Radius();
	202	aView->Proj(VX,VY,VZ);
7fd59977	203	V3d::CircleInPlane(gsphere,X0,Y0,Z0,VX,VY,VZ,Rayon);
7fd59977	204
b8ddfc2f	205	if (MyType != V3d_DIRECTIONAL) {
7fd59977	206
81bba717	207	//Display of the radius of the sphere (line + text)
7fd59977	208
b8ddfc2f	209	if (Pres == V3d_COMPLETE) {
	210	this->Position(X,Y,Z);
	211	Handle(Graphic3d_ArrayOfSegments) aPrims = new Graphic3d_ArrayOfSegments(2);
	212	aPrims->AddVertex(X0,Y0,Z0);
	213	aPrims->AddVertex(X,Y,Z);
	214	gnopick->AddPrimitiveArray(aPrims);
	215	V3d::ArrowOfRadius(gExtArrow,X-.1(X-X0),Y-.1(Y-Y0),Z-.1*(Z-Z0),X-X0,Y-Y0,Z-Z0,M_PI/15.,Rayon/20.);
	216	V3d::ArrowOfRadius(gIntArrow,X0,Y0,Z0,X0-X,Y0-Y,Z0-Z,M_PI/15.,Rayon/20.);
	217	TCollection_AsciiString ValOfRadius(Rayon);
	218	PText.SetCoord( .5(X0+X), .5(Y0+Y), .5*(Z0+Z) );
	219	gradius->Text(ValOfRadius.ToCString(),PText,0.01);
	220	}
	221	}
7fd59977	222
81bba717	223	// Display of the meridian
7fd59977	224
7fd59977	225	Quantity_Color Col2(Quantity_NOC_GREEN);
b8ddfc2f	226	Handle(Graphic3d_AspectLine3d) Asp2 = new Graphic3d_AspectLine3d(Col2,Aspect_TOL_SOLID,1.);
7fd59977	227	gnopick->SetPrimitivesAspect(Asp2);
7fd59977	228
81bba717	229	// Definition of the axis of circle
7fd59977	230	aView->Up(DXRef,DYRef,DZRef);
	231	this->Position(X,Y,Z);
	232	DXini = X-X0; DYini = Y-Y0; DZini = Z-Z0;
	233	VX = DYRefDZini - DZRefDYini;
	234	VY = DZRefDXini - DXRefDZini;
	235	VZ = DXRefDYini - DYRefDXini;
	236
	237	V3d::CircleInPlane(gnopick,X0,Y0,Z0,VX,VY,VZ,Rayon);
	238
81bba717	239	// Display of the parallel
7fd59977	240
81bba717	241	// Definition of the axis of circle
7fd59977	242	aView->Proj(VX,VY,VZ);
	243	aView->Up(X1,Y1,Z1);
	244	DXRef = VY * Z1 - VZ * Y1;
	245	DYRef = VZ * X1 - VX * Z1;
	246	DZRef = VX * Y1 - VY * X1;
	247	this->Position(X,Y,Z);
	248	DXini = X-X0; DYini = Y-Y0; DZini = Z-Z0;
	249	VX = DYRefDZini - DZRefDYini;
	250	VY = DZRefDXini - DXRefDZini;
	251	VZ = DXRefDYini - DYRefDXini;
	252
	253	V3d::CircleInPlane(gnopick,X0,Y0,Z0,VX,VY,VZ,Rayon);
	254	}
	255
	256	MyGraphicStructure->Connect(MyGraphicStructure1,Graphic3d_TOC_DESCENDANT);
	257	MyTypeOfRepresentation = Pres;
	258	MyGraphicStructure->Display();
	259	TheViewer->SetUpdateMode(UpdSov);
	260	}
	261
7fd59977	262
	263	void V3d_PositionLight::Tracking( const Handle(V3d_View)& aView,
	264	const V3d_TypeOfPickLight WhatPick,
	265	const Standard_Integer Xpix,
	266	const Standard_Integer Ypix) {
	267
	268	// Quantity_Color Col ;
	269	Standard_Real xPos, yPos, zPos;
	270	Standard_Real XPp,YPp,PXT,PYT,X,Y,Z,Rayon,Ylim;
	271	Standard_Real XMinTrack,XMaxTrack,YMinTrack,YMaxTrack;
	272	Standard_Real XT,YT,ZT,X0,Y0,Z0,XP,YP,ZP,VX,VY,VZ,A,B,C,Delta;
	273	Standard_Real DX,DY,PXP,PYP,Xproj,Yproj;
	274	Standard_Real A1,A2,B1,B2,Rap,OldRprj,NewRprj;
	275	Standard_Real Xi,Yi,Zi,DeltaX,DeltaY,DeltaZ,Lambda;
	276	Standard_Integer IPX,IPY;
	277
	278	aView->Convert(Xpix,Ypix,XPp,YPp);
	279	X0 = MyTarget.X();
	280	Y0 = MyTarget.Y();
	281	Z0 = MyTarget.Z();
	282	aView->Project(X0,Y0,Z0,PXT,PYT);
	283	aView->Convert(PXT,PYT,IPX,IPY);
81bba717	284	// Coord 3d in the plane of projection of the target.
7fd59977	285	aView->Convert(IPX,IPY,XT,YT,ZT);
	286	switch (WhatPick) {
	287	case V3d_POSITIONLIGHT :
81bba717	288	// The Coordinates should remain inside of the sphere
7fd59977	289	Rayon = Radius();
	290	XMinTrack = PXT - Rayon;
	291	XMaxTrack = PXT + Rayon;
	292	Ylim = Sqrt( Square(Rayon) - Square(XPp - PXT) );
	293	YMinTrack = PYT - Ylim;
	294	YMaxTrack = PYT + Ylim;
	295	if (XPp >= XMinTrack && XPp <= XMaxTrack) {
	296	if (YPp >= YMinTrack && YPp <= YMaxTrack) {
	297	aView->ProjReferenceAxe(Xpix,Ypix,XP,YP,ZP,VX,VY,VZ);
	298	DeltaX = X0 - XP;
	299	DeltaY = Y0 - YP;
	300	DeltaZ = Z0 - ZP;
	301
81bba717	302	// The point of intersection of straight lines defined by :
	303	// - Straight line passing by the point of projection and the eye
	304	// if this is a perspective, parralel to the normal of the view
	305	// if this is an axonometric view.
	306	// position in the view is parallel to the normal of the view
	307	// - The distance position of the target camera is equal to the radius.
7fd59977	308
	309	A = VXVX + VYVY + VZ*VZ ;
	310	B = -2. * (VXDeltaX + VYDeltaY + VZ*DeltaZ);
	311	C = DeltaXDeltaX + DeltaYDeltaY + DeltaZ*DeltaZ
	312	- Rayon*Rayon ;
	313	Delta = BB - 4.A*C;
	314	if ( Delta >= 0 ) {
	315	Lambda = (-B + Sqrt(Delta))/(2.*A);
	316	X = XP + Lambda*VX;
	317	Y = YP + Lambda*VY;
	318	Z = ZP + Lambda*VZ;
	319	SetPosition(X,Y,Z);
	320
	321	if (MyType == V3d_SPOT)
	322	((V3d_SpotLight*)this)->SetDirection(X0-X,Y0-Y,Z0-Z);
	323
	324	Display(aView,MyTypeOfRepresentation);
	325	(aView->Viewer())->UpdateLights();
	326	}
	327	}
	328	}
	329	break;
	330
	331	case V3d_SPACELIGHT :
	332	aView->Convert(PXT,PYT,IPX,IPY);
81bba717	333	// In this case Xpix,Ypix correspond to a distance, relative
81bba717	334	// to the translation that is planned to be performed on the sphere.
7fd59977	335	aView->Convert(IPX+Xpix,IPY+Ypix,X,Y,Z);
	336	X = X+X0-XT;
	337	Y = Y+Y0-YT;
	338	Z = Z+Z0-ZT;
	339	SetTarget(X,Y,Z);
	340	Display(aView,MyTypeOfRepresentation);
	341	(aView->Viewer())->UpdateLights();
	342	break;
	343
	344	case V3d_ExtRADIUSLIGHT :
	345	if (MyType == V3d_DIRECTIONAL)
	346	break;
81bba717	347	// it is attempted to preserve the target direction position of the
81bba717	348	// source ==> the point is projected on the target source direction.
7fd59977	349	this->Position(Xi,Yi,Zi);
	350	aView->Project(Xi,Yi,Zi,PXP,PYP);
	351	DX = PXP - PXT;
	352	DY = PYP - PYT;
	353	A1 = DY/DX ; B1 = PYT - A1*PXT;
	354	A2 = -DX/DY; B2 = YPp - A2*XPp;
	355	Xproj = (B2 - B1) / (A1 - A2);
	356	Yproj = A1*Xproj + B1;
	357	if ( (DX(Xproj-PXT) > 0.) && (DY(Yproj-PYT) > 0.) ) {
	358	OldRprj = Sqrt ( Square (PXP-PXT) + Square (PYP-PYT) );
	359	NewRprj = Sqrt ( Square (Xproj-PXT) + Square (Yproj-PYT) );
	360	Rap = NewRprj/OldRprj;
	361	Rayon = Radius();
	362	Rayon = Rayon * Rap;
	363	SetRadius(Rayon);
	364	Display(aView,MyTypeOfRepresentation);
	365	(aView->Viewer())->UpdateLights();
	366	}
	367	break;
	368
	369	case V3d_IntRADIUSLIGHT :
	370	if (MyType == V3d_DIRECTIONAL)
	371	break;
81bba717	372	// it is attempted to preserve the target direction position of the
81bba717	373	// source ==> the point is projected on the target source direction.
7fd59977	374	Position(Xi,Yi,Zi);
	375	aView->Project(Xi,Yi,Zi,PXP,PYP);
	376	DX = PXP - PXT;
	377	DY = PYP - PYT;
	378	A1 = DY/DX ; B1 = PYT - A1*PXT;
	379	A2 = -DX/DY; B2 = YPp - A2*XPp;
	380	Xproj = (B2 - B1) / (A1 - A2);
	381	Yproj = A1*Xproj + B1;
	382	if ( (DX(Xproj-PXP) < 0.) && (DY(Yproj-PYP) < 0.) ) {
	383	OldRprj = Sqrt ( Square (PXP-PXT) + Square (PYP-PYT) );
	384	NewRprj = Sqrt ( Square (Xproj-PXP) + Square (Yproj-PYP) );
	385	Rap = NewRprj/OldRprj;
	386	Rayon = Radius();
	387	Rayon = Rayon * Rap;
81bba717	388	// the source should remain at a fixed position,
81bba717	389	// only the target is modified.
7fd59977	390	Position (xPos, yPos, zPos);
	391	Graphic3d_Vector Dir(Graphic3d_Vertex(xPos,yPos,zPos), MyTarget);
	392	Dir.Normalize();
	393	Dir.Coord(X,Y,Z);
	394	X = Xi + Rayon*X;
	395	Y = Yi + Rayon*Y;
	396	Z = Zi + Rayon*Z;
81bba717	397	// the source should remain at a fixed position,
81bba717	398	// only the target is modified.
7fd59977	399	MyTarget.SetCoord(X,Y,Z);
	400	Display(aView,MyTypeOfRepresentation);
	401	(aView->Viewer())->UpdateLights();
	402	}
	403	break;
	404
	405	case V3d_RADIUSTEXTLIGHT :
	406	break;
	407
	408	case V3d_NOTHING :
	409	break;
	410	}
	411	}
	412
	413	Standard_Real V3d_PositionLight::Radius() const {
	414
	415	Standard_Real Xp,Yp,Zp, Xc,Yc,Zc;
	416
	417	Position (Xp,Yp,Zp);
	418	MyTarget.Coord(Xc,Yc,Zc);
	419
	420	return Sqrt (Square(Xc - Xp) + Square(Yc - Yp) + Square(Zc - Zp));
	421	}
	422
	423	void V3d_PositionLight::Erase() {
	424
	425	if (!MyGraphicStructure.IsNull()) MyGraphicStructure->Erase();
	426	if (!MyGraphicStructure1.IsNull()) MyGraphicStructure1->Erase();
	427	}
	428