soc-2008-mxcurioni: merged changes to revision 14747, cosmetic changes for source/blender/freestyle

1 files changed, 820 insertions, 0 deletions

diff --git a/source/blender/freestyle/intern/stroke/StrokeRep.cpp b/source/blender/freestyle/intern/stroke/StrokeRep.cpp
new file mode 100755
index 00000000000..055e1fb1be4
--- /dev/null
+++ b/source/blender/freestyle/intern/stroke/StrokeRep.cpp
@@ -0,0 +1,820 @@
+
+//
+//  Copyright (C) : Please refer to the COPYRIGHT file distributed 
+//   with this source distribution. 
+//
+//  This program is free software; you can redistribute it and/or
+//  modify it under the terms of the GNU General Public License
+//  as published by the Free Software Foundation; either version 2
+//  of the License, or (at your option) any later version.
+//
+//  This program is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with this program; if not, write to the Free Software
+//  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "StrokeRep.h"
+#include "Stroke.h"
+#include "StrokeRenderer.h"
+#include "StrokeAdvancedIterators.h"
+#include "StrokeIterators.h"
+
+using namespace std;
+
+//
+// STROKE VERTEX REP
+/////////////////////////////////////
+StrokeVertexRep::StrokeVertexRep(const StrokeVertexRep& iBrother){
+  _point2d = iBrother._point2d;
+  _texCoord = iBrother._texCoord;
+  _color = iBrother._color;
+  _alpha = iBrother._alpha;
+}
+
+//
+// STRIP
+/////////////////////////////////////
+
+Strip::Strip(const vector<StrokeVertex*>& iStrokeVertices, bool hasTips, bool beginTip, bool endTip){
+  createStrip(iStrokeVertices);
+  if (!hasTips)
+	  computeTexCoord (iStrokeVertices);
+  else
+	  computeTexCoordWithTips (iStrokeVertices, beginTip, endTip);
+}
+Strip::Strip(const Strip& iBrother){
+  if(!iBrother._vertices.empty()){
+    for(vertex_container::const_iterator v=iBrother._vertices.begin(), vend=iBrother._vertices.end();
+    v!=vend;
+    ++v){
+      _vertices.push_back(new StrokeVertexRep(**v));
+    }
+  }
+  _averageThickness = iBrother._averageThickness;
+}
+
+Strip::~Strip(){
+  if(!_vertices.empty()){
+    for(vertex_container::iterator v=_vertices.begin(), vend=_vertices.end();
+    v!=vend;
+    ++v){
+      delete (*v);
+    }
+    _vertices.clear();
+  }
+}
+
+//////////////////////////
+// Strip creation
+//////////////////////////
+#define EPS_SINGULARITY_RENDERER 0.05
+#define ZERO 0.00001
+#define MAX_RATIO_LENGTH_SINGU 2
+#define HUGE_COORD 1e4
+
+bool notValid (Vec2r p)
+{
+  return (p[0]!=p[0]) || (p[1]!=p[1]) || (fabs(p[0])>HUGE_COORD) || (fabs(p[1])>HUGE_COORD) 
+    || (p[0] <-HUGE_COORD) || (p[1]<-HUGE_COORD);
+}
+
+real crossP(const Vec2r& A, const Vec2r& B){
+  return A[0]*B[1] - A[1]*B[0];
+}
+
+void
+Strip::createStrip (const vector<StrokeVertex*>& iStrokeVertices)
+{
+  //computeParameterization();
+  if (iStrokeVertices.size() <2) 
+    {
+      cerr << "Warning: strip has less than 2 vertices" << endl;
+      return;
+    }
+  _vertices.reserve(2*iStrokeVertices.size());
+  if(!_vertices.empty()){
+    for(vertex_container::iterator v=_vertices.begin(), vend=_vertices.end();
+    v!=vend;
+    ++v){
+      delete (*v);
+    }
+    _vertices.clear();
+  }
+  _averageThickness=0.0;
+
+  vector<StrokeVertex*>::const_iterator v ,vend, v2, vPrev;
+  StrokeVertex *sv, *sv2, *svPrev;
+
+  //special case of first vertex
+  v=iStrokeVertices.begin();
+  sv=*v;
+  vPrev=v; //in case the stroke has only 2 vertices;
+  ++v; sv2=*v;
+  Vec2r dir(sv2->getPoint()-sv->getPoint());
+  Vec2r orthDir(-dir[1], dir[0]);
+  if (orthDir.norm() > ZERO)
+    orthDir.normalize();
+   const float *thickness =  sv->attribute().getThickness();
+  _vertices.push_back(new StrokeVertexRep(sv->getPoint()+thickness[1]*orthDir)); 
+  _vertices.push_back(new StrokeVertexRep(sv->getPoint()-thickness[0]*orthDir)); 
+
+  Vec2r stripDir(orthDir);
+  // check whether the orientation
+  // was user defined
+  if(sv->attribute().isAttributeAvailableVec2f("orientation")){
+    Vec2r userDir = sv->attribute().getAttributeVec2f("orientation");
+    userDir.normalize();
+    Vec2r t(orthDir[1], -orthDir[0]);
+    real dp1 = userDir*orthDir;
+    real dp2 = userDir*t;
+    real h = (thickness[1]+thickness[0])/dp1;
+    real x = fabs(h*dp2/2.0);
+    if(dp1>0){
+      //i'm in the upper part of the unit circle
+      if(dp2>0){
+        //i'm in the upper-right part of the unit circle
+        // i must move vertex 1
+        _vertices[1]->setPoint2d(_vertices[0]->point2d()-userDir*(h));
+        //_vertices[0]->setPoint2d(_vertices[0]->point2d()+t*x);
+        //_vertices[1]->setPoint2d(_vertices[1]->point2d()-t*x);
+      }else{
+        //i'm in the upper-left part of the unit circle
+        // i must move vertex 0
+        _vertices[0]->setPoint2d(_vertices[1]->point2d()+userDir*(h));
+        //_vertices[0]->setPoint2d(_vertices[0]->point2d()-t*x);
+        //_vertices[1]->setPoint2d(_vertices[1]->point2d()+t*x);
+      }
+    }else{
+      //i'm in the lower part of the unit circle
+      if(dp2>0){
+        //i'm in the lower-right part of the unit circle
+        // i must move vertex 0
+        //_vertices[0]->setPoint2d(_vertices[1]->point2d()-userDir*(h));
+        _vertices[0]->setPoint2d(_vertices[0]->point2d()-t*x);
+        //_vertices[1]->setPoint2d(_vertices[1]->point2d()+t*x);
+      }else{
+        //i'm in the lower-left part of the unit circle
+        // i must move vertex 1
+        _vertices[1]->setPoint2d(_vertices[0]->point2d()+userDir*(h));
+        //_vertices[0]->setPoint2d(_vertices[0]->point2d()-t*x);
+        //_vertices[1]->setPoint2d(_vertices[1]->point2d()-t*x);
+      }
+    }
+  }
+  
+  
+  //  Vec2r userDir = _stroke->getBeginningOrientation();
+  //  if(userDir != Vec2r(0,0)){
+  //    userDir.normalize();
+  //    real o1 = (orthDir*userDir);
+  //    real o2 = crossP(orthDir,userDir);
+  //    real orientation = o1 * o2;
+  //    if(orientation > 0){
+  //      // then the vertex to move is v0
+  //      if(o1 > 0)
+  //        _vertex[0]=_vertex[1]+userDir;
+  //      else
+  //        _vertex[0]=_vertex[1]-userDir;
+  //    }
+  //    if(orientation < 0){
+  //      // then we must move v1
+  //      if(o1 < 0)
+  //        _vertex[1]=_vertex[0]+userDir;
+  //      else
+  //        _vertex[1]=_vertex[0]-userDir;
+  //    }
+  //  }
+  
+  int i=2; //2 because we have already processed the first vertex
+
+  for(vend=iStrokeVertices.end();
+  v!=vend;
+  v++){
+      v2=v; ++v2;
+      if (v2==vend) break;
+      sv= (*v); sv2 = (*v2); svPrev=(*vPrev);
+      Vec2r p(sv->getPoint()), p2(sv2->getPoint()), pPrev(svPrev->getPoint());
+			
+      //direction and orthogonal vector to the next segment
+      Vec2r dir(p2-p);
+      float dirNorm=dir.norm();
+      dir.normalize();
+      Vec2r orthDir(-dir[1], dir[0]);
+      Vec2r stripDir = orthDir;
+      if(sv->attribute().isAttributeAvailableVec2f("orientation")){
+        Vec2r userDir = sv->attribute().getAttributeVec2f("orientation");
+        userDir.normalize();
+        real dp = userDir*orthDir;
+        if(dp<0)
+          userDir = userDir*(-1.f);
+        stripDir = userDir;
+      } 
+
+      //direction and orthogonal vector to the previous segment
+      Vec2r dirPrev(p-pPrev);
+      float dirPrevNorm=dirPrev.norm();
+      dirPrev.normalize();
+      Vec2r orthDirPrev(-dirPrev[1], dirPrev[0]);
+      Vec2r stripDirPrev = orthDirPrev;
+      if(svPrev->attribute().isAttributeAvailableVec2f("orientation")){
+        Vec2r userDir = svPrev->attribute().getAttributeVec2f("orientation");
+        userDir.normalize();
+        real dp = userDir*orthDir;
+        if(dp<0)
+          userDir = userDir*(-1.f);
+        stripDirPrev = userDir;
+      } 
+
+      const float *thickness =  sv->attribute().getThickness();
+      _averageThickness+=thickness[0]+thickness[1];
+      Vec2r pInter;
+      int interResult;
+
+      interResult=GeomUtils::intersect2dLine2dLine(Vec2r(pPrev+thickness[1]*stripDirPrev), Vec2r(p+thickness[1]*stripDirPrev),
+						   Vec2r(p+thickness[1]*stripDir), Vec2r(p2+thickness[1]*stripDir),
+						   pInter);
+		
+      if (interResult==GeomUtils::DO_INTERSECT) 
+        _vertices.push_back(new StrokeVertexRep(pInter));
+      else 
+        _vertices.push_back(new StrokeVertexRep(p+thickness[1]*stripDir));
+      ++i;
+		
+      interResult=GeomUtils::intersect2dLine2dLine(Vec2r(pPrev-thickness[0]*stripDirPrev), Vec2r(p-thickness[0]*stripDirPrev),
+						   Vec2r(p-thickness[0]*stripDir), Vec2r(p2-thickness[0]*stripDir),
+						   pInter);
+      if (interResult==GeomUtils::DO_INTERSECT) 
+        _vertices.push_back(new StrokeVertexRep(pInter));
+      else 
+        _vertices.push_back(new StrokeVertexRep(p-thickness[0]*stripDir));
+      ++i;
+		
+      // if the angle is obtuse, we simply average the directions to avoid the singularity
+      stripDir=stripDir+stripDirPrev;
+      if ((dirNorm<ZERO) || (dirPrevNorm<ZERO) || (stripDir.norm() < ZERO)) {
+	      stripDir[0] = 0;
+	      stripDir[1] = 0;
+      }else
+	      stripDir.normalize();
+
+      Vec2r vec_tmp(_vertices[i-2]->point2d()-p);
+      if  ((vec_tmp.norm() > thickness[1]*MAX_RATIO_LENGTH_SINGU) || 
+	        (dirNorm<ZERO) || (dirPrevNorm<ZERO) ||
+	        notValid(_vertices[i-2]->point2d()) 
+	        || (fabs(stripDir * dir) < EPS_SINGULARITY_RENDERER))
+	      _vertices[i-2]->setPoint2d(p+thickness[1]*stripDir);
+		
+      vec_tmp = _vertices[i-1]->point2d()-p;
+      if  ((vec_tmp.norm() > thickness[1]*MAX_RATIO_LENGTH_SINGU) ||
+	        (dirNorm<ZERO) || (dirPrevNorm<ZERO) ||
+	        notValid(_vertices[i-1]->point2d())
+	        || (fabs(stripDir * dir)<EPS_SINGULARITY_RENDERER))
+	      _vertices[i-1]->setPoint2d(p-thickness[0]*stripDir);
+
+      vPrev=v;
+  } // end of for
+
+  //special case of last vertex
+  sv=*v;
+  sv2=*vPrev;
+  dir=Vec2r (sv->getPoint()-sv2->getPoint());
+  orthDir=Vec2r(-dir[1], dir[0]);
+  if (orthDir.norm() > ZERO)
+    orthDir.normalize();
+  const float *thicknessLast =  sv->attribute().getThickness();
+  _vertices.push_back(new StrokeVertexRep(sv->getPoint()+thicknessLast[1]*orthDir));
+  ++i;
+  _vertices.push_back(new StrokeVertexRep(sv->getPoint()-thicknessLast[0]*orthDir));
+  int n = i;
+  ++i;
+  
+  // check whether the orientation
+  // was user defined
+  if(sv->attribute().isAttributeAvailableVec2f("orientation")){
+    Vec2r userDir = sv->attribute().getAttributeVec2f("orientation");
+    userDir.normalize();
+    Vec2r t(orthDir[1], -orthDir[0]);
+    real dp1 = userDir*orthDir;
+    real dp2 = userDir*t;
+    real h = (thicknessLast[1]+thicknessLast[0])/dp1;
+    real x = fabs(h*dp2/2.0);
+    if(dp1>0){
+      //i'm in the upper part of the unit circle
+      if(dp2>0){
+        //i'm in the upper-right part of the unit circle
+        // i must move vertex n-1
+        _vertices[n-1]->setPoint2d(_vertices[n]->point2d()-userDir*(h));
+        //_vertices[n-1]->setPoint2d(_vertices[n-1]->point2d()+t*x);
+        //_vertices[n]->setPoint2d(_vertices[n]->point2d()-t*x);
+      }else{
+        //i'm in the upper-left part of the unit circle
+        // i must move vertex n
+        _vertices[n]->setPoint2d(_vertices[n-1]->point2d()+userDir*(h));
+        //_vertices[n-1]->setPoint2d(_vertices[n-1]->point2d()-t*x);
+        //_vertices[n]->setPoint2d(_vertices[n]->point2d()+t*x);
+      }
+    }else{
+      //i'm in the lower part of the unit circle
+      if(dp2>0){
+        //i'm in the lower-right part of the unit circle
+        // i must move vertex n
+        _vertices[n]->setPoint2d(_vertices[n-1]->point2d()-userDir*(h));
+        //_vertices[n-1]->setPoint2d(_vertices[n-1]->point2d()-t*x);
+        //_vertices[n]->setPoint2d(_vertices[n]->point2d()+t*x);
+      }else{
+        //i'm in the lower-left part of the unit circle
+        // i must move vertex n-1
+        _vertices[n-1]->setPoint2d(_vertices[n]->point2d()+userDir*(h));
+        //_vertices[n-1]->setPoint2d(_vertices[n-1]->point2d()+t*x);
+        //_vertices[n]->setPoint2d(_vertices[n]->point2d()-t*x);
+      }
+    }
+  }
+  
+	
+  // check whether the orientation of the extremity 
+  // was user defined
+  //  userDir = _stroke->getEndingOrientation();
+  //  if(userDir != Vec2r(0,0)){
+  //    userDir.normalize();
+  //    real o1 = (orthDir*userDir);
+  //    real o2 = crossP(orthDir,userDir);
+  //    real orientation = o1 * o2;
+  //    if(orientation > 0){
+  //      // then the vertex to move is vn
+  //      if(o1 < 0)
+  //        _vertex[n]=_vertex[n-1]+userDir;
+  //      else
+  //        _vertex[n]=_vertex[n-1]-userDir;
+  //    }
+  //    if(orientation < 0){
+  //      // then we must move vn-1
+  //      if(o1 > 0)
+  //        _vertex[n-1]=_vertex[n]+userDir;
+  //      else
+  //        _vertex[n-1]=_vertex[n]-userDir;
+  //    }
+  //  }
+
+  _averageThickness/=float(iStrokeVertices.size()-2); 
+  //I did not use the first and last vertex for the average
+  if (iStrokeVertices.size()<3)
+    _averageThickness=0.5*(thicknessLast[1]+thicknessLast[0]+thickness[0]+thickness[1]);
+
+  if (i!=2*iStrokeVertices.size())
+    cerr << "Warning: problem with stripe size\n";
+
+  cleanUpSingularities (iStrokeVertices);
+}	
+
+// CLEAN UP
+/////////////////////////
+
+void
+Strip::cleanUpSingularities (const vector<StrokeVertex*>& iStrokeVertices)
+{
+  int k;
+  unsigned sizeStrip = _vertices.size();
+
+  for (k=0; k<sizeStrip; k++)
+    if (notValid(_vertices[k]->point2d()))
+      {
+	cerr << "Warning: strip vertex " << k << " non valid" << endl;
+	return;
+      }
+
+  //return;
+  if (iStrokeVertices.size()<2) return;
+  int i=0, j;
+  vector<StrokeVertex*>::const_iterator v ,vend, v2, vPrev;
+  StrokeVertex *sv, *sv2, *svPrev;
+	
+  bool singu1=false, singu2=false;
+  int timeSinceSingu1=0, timeSinceSingu2=0;
+
+  //special case of first vertex
+  v=iStrokeVertices.begin();
+  for(vend=iStrokeVertices.end();
+      v!=vend;
+      v++)
+    {
+      v2=v; ++v2;
+      if (v2==vend) break;
+      sv= (*v); sv2 = (*v2); 
+      Vec2r p(sv->getPoint()), p2(sv2->getPoint());
+		
+      Vec2r dir(p2-p);
+      if (dir.norm() > ZERO)
+	dir.normalize();
+      Vec2r dir1, dir2;
+      dir1=_vertices[2*i+2]->point2d()-_vertices[2*i]->point2d();
+      dir2=_vertices[2*i+3]->point2d()-_vertices[2*i+1]->point2d();
+		
+      if ((dir1 * dir) < -ZERO)
+	{
+	  singu1=true;
+	  timeSinceSingu1++;
+	}
+      else
+	{
+	  if (singu1)
+	    {
+	      int toto=i-timeSinceSingu1;
+	      if (toto<0) 
+		cerr << "Stephane dit \"Toto\"" << endl;
+	      //traverse all the vertices of the singularity and average them
+	      Vec2r avP(0.0,0.0);
+	      for (j=i-timeSinceSingu1; j<i+1; j++)
+		avP=Vec2r(avP+_vertices[2*j]->point2d());
+	      avP=Vec2r(1.0/float(timeSinceSingu1+1)*avP);
+	      for (j=i-timeSinceSingu1; j<i+1; j++)
+		_vertices[2*j]->setPoint2d(avP);
+	      //_vertex[2*j]=_vertex[2*i];
+	      singu1=false; timeSinceSingu1=0;
+	    }
+	}
+      if ((dir2 * dir) < -ZERO)
+	{
+	  singu2=true;
+	  timeSinceSingu2++;
+	}
+      else
+	{
+	  if (singu2)
+	    {
+	      int toto=i-timeSinceSingu2;
+	      if (toto<0) 
+		cerr << "Stephane dit \"Toto\"" << endl;
+	      //traverse all the vertices of the singularity and average them
+	      Vec2r avP(0.0,0.0);
+	      for (j=i-timeSinceSingu2; j<i+1; j++)
+		avP=Vec2r(avP+_vertices[2*j+1]->point2d());
+	      avP=Vec2r(1.0/float(timeSinceSingu2+1)*avP);
+	      for (j=i-timeSinceSingu2; j<i+1; j++)
+		_vertices[2*j+1]->setPoint2d(avP);
+	      //_vertex[2*j+1]=_vertex[2*i+1];
+	      singu2=false; timeSinceSingu2=0;
+	    }
+	}	
+      i++;
+    }
+	
+  if (singu1)
+    {
+      //traverse all the vertices of the singularity and average them
+      Vec2r avP(0.0,0.0);
+      for (int j=i-timeSinceSingu1; j<i; j++)
+	avP=Vec2r(avP+_vertices[2*j]->point2d());
+      avP=Vec2r(1.0/float(timeSinceSingu1)*avP);
+      for (j=i-timeSinceSingu1; j<i; j++)
+	_vertices[2*j]->setPoint2d(avP);
+    }
+  if (singu2)
+    {
+      //traverse all the vertices of the singularity and average them
+      Vec2r avP(0.0,0.0);
+      for (j=i-timeSinceSingu2; j<i; j++)
+	avP=Vec2r(avP+_vertices[2*j+1]->point2d());
+      avP=Vec2r(1.0/float(timeSinceSingu2)*avP);
+      for (j=i-timeSinceSingu2; j<i; j++)
+	_vertices[2*j+1]->setPoint2d(avP);
+    }
+	
+
+  for (k=0; k<sizeStrip; k++)
+    if (notValid(_vertices[k]->point2d()))
+      {
+	cerr << "Warning: strip vertex " << k << " non valid after cleanup"<<endl;
+	return;
+      }
+}
+
+
+// Texture coordinates
+////////////////////////////////
+
+void
+Strip::computeTexCoord (const vector<StrokeVertex*>& iStrokeVertices)
+{
+  vector<StrokeVertex*>::const_iterator v ,vend;
+  StrokeVertex *sv;
+  int i=0;
+  for(v=iStrokeVertices.begin(), vend=iStrokeVertices.end();
+      v!=vend;	v++)
+    {
+      sv= (*v); 
+      _vertices[i]->setTexCoord(Vec2r((real)(sv->curvilinearAbscissa() / _averageThickness),0));
+      _vertices[i]->setColor(Vec3r(sv->attribute().getColor()[0],sv->attribute().getColor()[1],sv->attribute().getColor()[2]));
+      _vertices[i]->setAlpha(sv->attribute().getAlpha());
+      i++;
+      _vertices[i]->setTexCoord(Vec2r((real)(sv->curvilinearAbscissa() / _averageThickness),1));
+      _vertices[i]->setColor(Vec3r(sv->attribute().getColor()[0],sv->attribute().getColor()[1],sv->attribute().getColor()[2]));
+      _vertices[i]->setAlpha(sv->attribute().getAlpha());
+      i++;
+      //		cerr<<"col=("<<sv->attribute().getColor()[0]<<", "
+      //			<<sv->attribute().getColor()[1]<<", "<<sv->attribute().getColor()[2]<<")"<<endl;
+    }
+}
+
+void
+Strip::computeTexCoordWithTips (const vector<StrokeVertex*>& iStrokeVertices, bool tipBegin, bool tipEnd)
+{
+  unsigned int sizeStrip = _vertices.size()+8; //for the transition between the tip and the body
+  vector<StrokeVertex*>::const_iterator v ,vend;
+  StrokeVertex *sv;
+
+  v=iStrokeVertices.begin();
+  vend=iStrokeVertices.end();
+  float l=(*v)->strokeLength()/_averageThickness;
+  int tiles=int(l);
+  float fact=(float(tiles)+0.5)/l;
+  float uTip2=float(tiles)+0.25;
+  float u=0; 
+  float uPrev;
+  int i=0;
+  float t;
+  StrokeVertexRep *tvRep1, *tvRep2;
+
+  //		cerr<<"l="<<l<<"  tiles="<<tiles<<"    _averageThicnkess="
+  //			<<_averageThickness<<"    strokeLength="<<(*v)->strokeLength()<<endl;
+  //
+  vector<StrokeVertexRep*>::iterator currentSV = _vertices.begin();
+  StrokeVertexRep *svRep;
+  if(tipBegin){
+  for(;v!=vend; v++)
+    {
+      sv= (*v); 
+      svRep = *currentSV;
+      u=sv->curvilinearAbscissa()/_averageThickness*fact;
+      if (u>0.25) break;
+
+      
+      svRep->setTexCoord(Vec2r((real)u, 0.5));
+      svRep->setColor(Vec3r(sv->attribute().getColor()[0],sv->attribute().getColor()[1],sv->attribute().getColor()[2]));
+      svRep->setAlpha(sv->attribute().getAlpha());
+      i++;
+      ++currentSV;
+      
+      svRep = *currentSV;
+      svRep->setTexCoord(Vec2r((real)u, 1));
+      svRep->setColor(Vec3r(sv->attribute().getColor()[0],sv->attribute().getColor()[1],sv->attribute().getColor()[2]));
+      svRep->setAlpha(sv->attribute().getAlpha());
+      i++;
+      ++currentSV;
+      uPrev=u;
+    }
+  //first transition vertex
+  
+  if (fabs(u-uPrev)>ZERO)
+    t= (0.25-uPrev)/(u-uPrev);
+  else t=0;
+  //if (!tiles) t=0.5;
+  tvRep1 = new StrokeVertexRep(Vec2r((1-t)*_vertices[i-2]->point2d()+t*_vertices[i]->point2d()));
+  tvRep1->setTexCoord(Vec2r(0.25,0.5));
+  tvRep1->setColor(Vec3r((1-t)*_vertices[i-2]->color()+
+		  t*Vec3r(sv->attribute().getColor()[0],sv->attribute().getColor()[1],sv->attribute().getColor()[2])));
+  tvRep1->setAlpha((1-t)*_vertices[i-2]->alpha()+t*sv->attribute().getAlpha());
+  i++;
+  
+  tvRep2 = new StrokeVertexRep(Vec2r((1-t)*_vertices[i-2]->point2d()+t*_vertices[i]->point2d()));
+  tvRep2->setTexCoord(Vec2r(0.25,1));
+  tvRep2->setColor(Vec3r((1-t)*_vertices[i-2]->color()+
+		  t*Vec3r(sv->attribute().getColor()[0],sv->attribute().getColor()[1],sv->attribute().getColor()[2])));
+  tvRep2->setAlpha((1-t)*_vertices[i-2]->alpha()+t*sv->attribute().getAlpha());
+  i++;
+
+  currentSV = _vertices.insert(currentSV, tvRep1);
+  ++currentSV;
+  currentSV = _vertices.insert(currentSV, tvRep2);
+  ++currentSV;
+
+  //copy the vertices with different texture coordinates
+  tvRep1 = new StrokeVertexRep(_vertices[i-2]->point2d());
+  tvRep1->setTexCoord(Vec2r(0.25,0));
+  tvRep1->setColor(_vertices[i-2]->color());
+  tvRep1->setAlpha(_vertices[i-2]->alpha());
+  i++;
+
+  tvRep2 = new StrokeVertexRep(_vertices[i-2]->point2d());
+  tvRep2->setTexCoord(Vec2r(0.25,0.5));
+  tvRep2->setColor(_vertices[i-2]->color());
+  tvRep2->setAlpha(_vertices[i-2]->alpha());
+  i++;
+  
+  currentSV = _vertices.insert(currentSV, tvRep1);
+  ++currentSV;
+  currentSV = _vertices.insert(currentSV, tvRep2);
+  ++currentSV;
+  }
+  uPrev=0;
+
+  //body of the stroke
+  for(;v!=vend; v++)
+    {
+      sv= (*v); 
+      svRep = *currentSV;
+      u=sv->curvilinearAbscissa()/_averageThickness*fact-0.25;
+      if (u>tiles) break;
+
+      svRep->setTexCoord(Vec2r((real)u, 0));
+      svRep->setColor(Vec3r(sv->attribute().getColor()[0],sv->attribute().getColor()[1],sv->attribute().getColor()[2]));
+      svRep->setAlpha(sv->attribute().getAlpha());
+      i++;
+      ++currentSV;
+
+      svRep = *currentSV;
+      svRep->setTexCoord(Vec2r((real)u, 0.5));
+      svRep->setColor(Vec3r(sv->attribute().getColor()[0],sv->attribute().getColor()[1],sv->attribute().getColor()[2]));
+      svRep->setAlpha(sv->attribute().getAlpha());
+      i++;
+      ++currentSV;
+      
+      uPrev=u;
+    }
+  if(tipEnd){
+  //second transition vertex
+  if ((fabs(u-uPrev)>ZERO))
+    t= (float(tiles)-uPrev)/(u-uPrev);
+  else t=0;
+
+  tvRep1 = new StrokeVertexRep(Vec2r((1-t)*_vertices[i-2]->point2d()+t*_vertices[i]->point2d()));
+  tvRep1->setTexCoord(Vec2r((real)tiles,0));
+  tvRep1->setColor(Vec3r((1-t)*_vertices[i-2]->color()+
+		  t*Vec3r(sv->attribute().getColor()[0],sv->attribute().getColor()[1],sv->attribute().getColor()[2])));
+  tvRep1->setAlpha((1-t)*_vertices[i-2]->alpha()+t*sv->attribute().getAlpha());
+  i++;
+  
+  tvRep2 = new StrokeVertexRep(Vec2r((1-t)*_vertices[i-2]->point2d()+t*_vertices[i]->point2d()));
+  tvRep2->setTexCoord(Vec2r((real)tiles,0.5));
+  tvRep2->setColor(Vec3r((1-t)*_vertices[i-2]->color()+
+		  t*Vec3r(sv->attribute().getColor()[0],sv->attribute().getColor()[1],sv->attribute().getColor()[2])));
+  tvRep2->setAlpha((1-t)*_vertices[i-2]->alpha()+t*sv->attribute().getAlpha());
+  i++;
+
+  currentSV = _vertices.insert(currentSV, tvRep1);
+  ++currentSV;
+  currentSV = _vertices.insert(currentSV, tvRep2);
+  ++currentSV;
+
+  //copy the vertices with different texture coordinates
+  tvRep1 = new StrokeVertexRep(_vertices[i-2]->point2d());
+  tvRep1->setTexCoord(Vec2r(0.75,0.5));
+  tvRep1->setColor(_vertices[i-2]->color());
+  tvRep1->setAlpha(_vertices[i-2]->alpha());
+  i++;
+
+  tvRep2 = new StrokeVertexRep(_vertices[i-2]->point2d());
+  tvRep2->setTexCoord(Vec2r(0.75,1));
+  tvRep2->setColor(_vertices[i-2]->color());
+  tvRep2->setAlpha(_vertices[i-2]->alpha());
+  i++;
+  
+  currentSV = _vertices.insert(currentSV, tvRep1);
+  ++currentSV;
+  currentSV = _vertices.insert(currentSV, tvRep2);
+  ++currentSV;
+
+  //end tip
+  for(;v!=vend; v++)
+    {
+      sv= (*v); 
+      svRep = *currentSV;
+      u=0.75+sv->curvilinearAbscissa()/_averageThickness*fact-float(tiles)-0.25;
+      
+      svRep->setTexCoord(Vec2r((real)u, 0.5));
+      svRep->setColor(Vec3r(sv->attribute().getColor()[0],sv->attribute().getColor()[1],sv->attribute().getColor()[2]));
+      svRep->setAlpha(sv->attribute().getAlpha());
+      i++;
+      ++currentSV;
+      
+      svRep = *currentSV;
+      svRep->setTexCoord(Vec2r((real)u, 1));
+      svRep->setColor(Vec3r(sv->attribute().getColor()[0],sv->attribute().getColor()[1],sv->attribute().getColor()[2]));
+      svRep->setAlpha(sv->attribute().getAlpha());
+      i++;
+      ++currentSV;
+    }
+  }
+  //cerr<<"u="<<u<<"    i="<<i<<"/"<<_sizeStrip<<endl;;
+
+  //  for (i=0; i<_sizeStrip; i++)
+  //    _alpha[i]=1.0;
+
+  //	for (i=0; i<_sizeStrip; i++)
+  //			cerr<<"("<<_texCoord[i][0]<<", "<<_texCoord[i][1]<<") ";
+  //	cerr<<endl;
+
+  
+  //  Vec2r vec_tmp;
+  //  for (i=0; i<_sizeStrip/2; i++)
+  //    vec_tmp = _vertex[2*i] - _vertex[2*i+1];
+  //    if (vec_tmp.norm() > 4*_averageThickness)
+  //      cerr << "Warning (from Fredo): There is a pb in the texture coordinates computation" << endl;
+}
+
+//
+// StrokeRep
+/////////////////////////////////////
+
+StrokeRep::StrokeRep()
+{
+  _stroke = 0;
+  _strokeType=Stroke::OPAQUE_MEDIUM;
+  TextureManager * ptm = TextureManager::getInstance();
+  if(ptm)
+    _textureId = ptm->getDefaultTextureId();
+  // _averageTextureAlpha=0.5; //default value
+  // if (_strokeType==OIL_STROKE)
+    // _averageTextureAlpha=0.75; 
+  // if (_strokeType>=NO_BLEND_STROKE)
+    // _averageTextureAlpha=1.0
+} 
+
+StrokeRep::StrokeRep(Stroke *iStroke)
+{
+  _stroke = iStroke;
+  _strokeType = iStroke->getMediumType();
+  _textureId = iStroke->getTextureId();
+  if(_textureId == 0){
+    TextureManager * ptm = TextureManager::getInstance();
+    if(ptm)
+      _textureId = ptm->getDefaultTextureId();
+  }
+    
+  // _averageTextureAlpha=0.5; //default value
+  // if (_strokeType==OIL_STROKE)
+    // _averageTextureAlpha=0.75; 
+  // if (_strokeType>=NO_BLEND_STROKE)
+    // _averageTextureAlpha=1.0;
+  create();
+}
+
+StrokeRep::StrokeRep(const StrokeRep& iBrother)
+{
+  int i=0;
+  _stroke = iBrother._stroke;
+  _strokeType=iBrother._strokeType;
+  _textureId = iBrother._textureId;
+  for(vector<Strip*>::const_iterator s=iBrother._strips.begin(), send=iBrother._strips.end();
+  s!=send;
+  ++s){
+    _strips.push_back(new Strip(**s));
+  }
+}
+
+
+StrokeRep::~StrokeRep()
+{
+  if(!_strips.empty()){
+    for(vector<Strip*>::iterator s=_strips.begin(), send=_strips.end();
+    s!=send;
+    ++s){
+      delete (*s);
+    }
+    _strips.clear();
+  }
+}
+
+void StrokeRep::create(){
+  vector<StrokeVertex*> strip;
+  StrokeInternal::StrokeVertexIterator v = _stroke->strokeVerticesBegin();
+  StrokeInternal::StrokeVertexIterator vend = _stroke->strokeVerticesEnd();
+  
+  bool first=true;
+  bool end=false;
+  while(v!=vend){
+    while((v!=vend) && (!(*v).attribute().isVisible())){
+      ++v;
+      first = false;
+    }
+    while( (v!=vend) && ((*v).attribute().isVisible()) ) {
+      strip.push_back(&(*v));
+      ++v;
+    }
+    if(v!=vend){
+      // add the last vertex and create
+      strip.push_back(&(*v));
+    }else{
+      end=true;
+    }
+    if((!strip.empty()) && (strip.size()>1) ){
+      _strips.push_back(new Strip(strip, _stroke->hasTips(), first, end));
+      strip.clear();
+    }
+    first = false;
+  }
+} 
+
+void StrokeRep::Render(const StrokeRenderer *iRenderer)
+{
+  iRenderer->RenderStrokeRep(this);
+}
+
+
+