ArrowItem.cpp

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/*  Copyright (C) 2008 National Institute For Space Research (INPE) - Brazil.

    This file is part of the TerraLib - a Framework for building GIS enabled applications.

    TerraLib 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 3 of the License,
    or (at your option) any later version.

    TerraLib 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 TerraLib. See COPYING. If not, write to
    TerraLib Team at <terralib-team@terralib.org>.
 */

/*!
  \file ArrowItem.cpp
   
  \brief 

  \ingroup layout
*/

// TerraLib
#include "ArrowItem.h"
#include "../../core/pattern/mvc/ItemController.h"
#include "../../core/AbstractScene.h"
#include "../../core/pattern/mvc/Observable.h"
#include "../../../color/RGBAColor.h"
#include "../../../qt/widgets/Utils.h"
#include "../../../geometry/Envelope.h"
#include "../../../common/STLUtils.h"
#include "../../item/ArrowModel.h"

#include <cmath>

te::layout::ArrowItem::ArrowItem( ItemController* controller, Observable* o ) :
  ObjectItem(controller, o)
{
  m_nameClass = std::string(this->metaObject()->className());
}

te::layout::ArrowItem::~ArrowItem()
{

}

void te::layout::ArrowItem::paint( QPainter * painter, const QStyleOptionGraphicsItem * option, QWidget * widget /*= 0 */ )
{
  Q_UNUSED( option );
  Q_UNUSED( widget );
  if ( !painter )
  {
    return;
  }

  drawBackground(painter);

  drawArrow(painter);

  drawBorder(painter);

  //Draw Selection
  if (option->state & QStyle::State_Selected)
  {
    drawSelection(painter);
  }
}

void te::layout::ArrowItem::drawArrow( QPainter * painter )
{
  ArrowModel* model = dynamic_cast<ArrowModel*>(m_model);
  if(!model)
  {
    return;
  }

  painter->save();

  QRectF boundRect = boundingRect();

  QColor cblack(0,0,0);
  QPen pn(cblack, 0, Qt::SolidLine);
  painter->setPen(pn);

  double centerY = boundRect.center().y();
  
  QLineF lne(boundRect.bottomLeft().x(), centerY, boundRect.width(), centerY);

  painter->drawLine(lne);

  painter->restore();

  /* Draw Arrow Head */
  drawHeadArrow(painter);
}

void te::layout::ArrowItem::drawHeadArrow( QPainter * painter )
{
  painter->save();

  QBrush bsh(Qt::black);
  painter->setBrush(bsh);
  painter->setPen(Qt::NoPen);

  QRectF boundRect = boundingRect();

  double h = boundRect.height();

  double centerY = boundRect.center().y();
  QLineF lne(boundRect.bottomLeft().x(), centerY, boundRect.width(), centerY);

  double Pi = 3.14;
  double sizeHead = (h / 5.);

  double angle = std::acos(lne.dx() / lne.length());
  if (lne.dy() >= 0)
    angle = (Pi * 2) - angle;

  QPointF arrowP1 = lne.p1() + QPointF(sin(angle + Pi / 3) * sizeHead,
    cos(angle + Pi / 3) * sizeHead);
  QPointF arrowP2 = lne.p1() + QPointF(sin(angle + Pi - Pi / 3) * sizeHead,
    cos(angle + Pi - Pi / 3) * sizeHead);

  QPolygonF trianglePolygon;
  trianglePolygon << lne.p1() << arrowP1 << arrowP2;

  painter->drawPolygon(trianglePolygon);

  painter->restore();
}