//  SMESH SMESHGUI : GUI for SMESH component
//
//  Copyright (C) 2003  OPEN CASCADE, EADS/CCR, LIP6, CEA/DEN,
//  CEDRAT, EDF R&D, LEG, PRINCIPIA R&D, BUREAU VERITAS
//
//  This library is free software; you can redistribute it and/or
//  modify it under the terms of the GNU Lesser General Public
//  License as published by the Free Software Foundation; either
//  version 2.1 of the License.
//
//  This library 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
//  Lesser General Public License for more details.
//
//  You should have received a copy of the GNU Lesser General Public
//  License along with this library; if not, write to the Free Software
//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
//
// See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
//
//
//
//  File   : SMESHGUI_PatternWidget.cxx
//  Author : Michael ZORIN
//  Module : SMESH
//  $Header:

#include "SMESHGUI_PatternWidget.h"

//Qt includes
#include <qpainter.h>
#include <qpoint.h>


//=================================================================================
// class    : SMESHGUI_PatternWidget()
// purpose  :
//=================================================================================
SMESHGUI_PatternWidget::SMESHGUI_PatternWidget (QWidget* parent, const char* name, WFlags fl)
     : QFrame(parent, name, WStyle_Customize)
{
  myMinU =  myMinV =  myMaxU =  myMaxV = 0;
  setMinimumHeight(150);
  repaint();
}

//=================================================================================
// function : ~SMESHGUI_PatternWidget()
// purpose  :
//=================================================================================
SMESHGUI_PatternWidget::~SMESHGUI_PatternWidget()
{
}

//=================================================================================
// function : SetPoints()
// purpose  :
//=================================================================================
void SMESHGUI_PatternWidget::SetPoints (PointVector thePoints,
                                        QValueVector<int> theKeys,
                                        ConnectivityVector theConnections)
{
  myPoints = thePoints;
  myKeys = theKeys;
  myConnections  = theConnections;

  if (!thePoints.size())
    return;

  myMinU = myMaxU = (thePoints[0]).x;
  myMinV = myMaxV = (thePoints[0]).y;
  double x, y;

  for (int i = 1; i < thePoints.size(); i++) {
    x = (thePoints[i]).x;
    y = (thePoints[i]).y;

    if (myMinU > x)
      myMinU = x;
    if (myMaxU < x)
      myMaxU = x;
    if (myMinV > y)
      myMinV = y;
    if (myMaxV < y)
      myMaxV = y;
  }

  repaint();
}

static const int Shift  = 4; // shift of the point number from point
static const int Border = 20;

//=================================================================================
// function : paintEvent()
// purpose  :
//=================================================================================
void SMESHGUI_PatternWidget::paintEvent (QPaintEvent*)
{
  QPainter paint (this);
  paint.setBrush(Qt::SolidPattern);

  //Draw points
  const int aRadius = 3; // radius of a point

  for (int i = 0; i < myKeys.size() && i < myPoints.size(); i++) {
    SMESH::PointStruct aPoint = myPoints[ myKeys[i] ];
    QPoint aQPnt = MapCoords(aPoint.x, aPoint.y);

    paint.drawPie(aQPnt.x() - aRadius, aQPnt.y() - aRadius, aRadius*2, aRadius*2, 5760, 5760);
    paint.drawText(aQPnt.x() +  Shift, aQPnt.y() -   Shift, QString::number(i+1));
  }

  //Draw lines
  for (int i = 0; i < myConnections.size(); i++) {
    QValueVector<int> aCVector = myConnections[i];

    if (aCVector.size() == 0)
      continue;

    SMESH::PointStruct aPoint = myPoints[ aCVector[0] ];
    const QPoint aBeginPnt = MapCoords(aPoint.x, aPoint.y);
    QPoint aFirstPnt = aBeginPnt, aSecondPnt;

    for (int j = 1; j < aCVector.size(); j++) {
      aPoint = myPoints[ aCVector[j] ];
      aSecondPnt = MapCoords(aPoint.x, aPoint.y);
      paint.drawLine(aFirstPnt, aSecondPnt);
      aFirstPnt = aSecondPnt;
    }

    paint.drawLine(aBeginPnt, aSecondPnt);
  }
}

//=================================================================================
// function : MapCoords()
// purpose  :
//=================================================================================
QPoint SMESHGUI_PatternWidget::MapCoords (const double u, const double v)
{
  int aWidth  = width()  - 2*Border;
  int aHeight = height() - 2*Border;

  double aUBound = myMaxU - myMinU;
  double aVBound = myMaxV - myMinV;

  double aUScale = aWidth/aUBound;
  double aVScale = aHeight/aVBound;

  double aScale;
  aUScale <= aVScale ? aScale = aUScale : aScale = aVScale;

  double aUMiddle = (myMaxU + myMinU)/2;
  double aVMiddle = (myMaxV + myMinV)/2;

  int x = int(aWidth/2  + (u - aUMiddle)*aScale + Border - Shift);

  int y = int(aHeight/2 + (aVMiddle - v)*aScale + Border + Shift);

  QPoint aPoint = QPoint(x, y);

  return aPoint;
}