LegendModel.cpp

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/*  Copyright (C) 2001-2014 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 LegendModel.cpp
   
  \brief 

  \ingroup layout
*/

// TerraLib
#include "LegendModel.h"
#include "Context.h"
#include "MapModel.h"
#include "Property.h"
#include "Properties.h"
#include "SharedProperties.h"
#include "../../../maptools/CanvasConfigurer.h"
#include "../../../se/Symbolizer.h"
#include "../../../se/Style.h"
#include "../../../se/Rule.h"
#include "../../../geometry/Polygon.h"
#include "../../../geometry/Geometry.h"
#include "../../../geometry/Envelope.h"

te::layout::LegendModel::LegendModel() :
  m_mapName(""),
  m_layer(0),
  m_borderDisplacement(2),
  m_displacementBetweenSymbols(2),
  m_displacementBetweenTitleAndSymbols(5),
  m_displacementBetweenSymbolsAndText(3)
{
  m_box = te::gm::Envelope(0., 0., 70., 50.);
}

te::layout::LegendModel::~LegendModel()
{

}

void te::layout::LegendModel::draw( ContextItem context )
{
  te::color::RGBAColor** pixmap = 0;

  te::map::Canvas* canvas = Context::getInstance()->getCanvas();
  Utils* utils = Context::getInstance()->getUtils();

  if(context.isResizeCanvas())
    utils->configCanvas(m_box);
  
  if(m_border)
  {
    canvas->setPolygonContourWidth(2);
    canvas->setPolygonContourColor(te::color::RGBAColor(0, 0, 0, 255));
    canvas->setPolygonFillColor(m_backgroundColor);

    utils->drawRectW(m_box);
  }

  drawLegend(canvas, utils);

  if(context.isResizeCanvas())
    pixmap = utils->getImageW(m_box);

  ContextItem contextNotify;
  contextNotify.setPixmap(pixmap);
  notifyAll(contextNotify);
}

void te::layout::LegendModel::drawLegend( te::map::Canvas* canvas, Utils* utils )
{
  if(!m_layer)
    return;

  if(!m_layer->getStyle())
    return;
  
  // Number of rules defined on feature type style
  std::size_t nRules = m_layer->getStyle()->getRules().size();

  //Header
  std::string layerName = m_layer->getTitle();
  
  double wtxt = 0;
  double htxt = 0;
 
  utils->textBoundingBox(wtxt, htxt, layerName);

  canvas->setTextPointSize(12);
  canvas->setTextColor(te::color::RGBAColor(0, 0, 0, 255));
  canvas->drawText(m_box.getCenter().x - wtxt, m_box.getUpperRightY() - htxt, layerName, 0);
  
  // Creates a canvas configurer
  te::map::CanvasConfigurer cc(canvas);

  for(std::size_t i = 0; i < nRules; ++i) // for each <Rule>
  {
    // The current rule
    te::se::Rule* rule = m_layer->getStyle()->getRule(i);
    assert(rule);
        
    // Gets the set of symbolizers defined on current rule
    const std::vector<te::se::Symbolizer*>& symbolizers = rule->getSymbolizers();

    if(symbolizers.empty())
    {
      continue;
    }

    std::size_t nSymbolizers = symbolizers.size();

    for(std::size_t j = 0; j < nSymbolizers; ++j) // for each <Symbolizer>
    {
      // The current symbolizer
      te::se::Symbolizer* symb = symbolizers[j];

      // Let's config the canvas based on the current symbolizer
      cc.config(symb);

      //Test
      te::gm::Envelope box(m_box.getLowerLeftX(), m_box.getUpperRightY() - 20, m_box.getLowerLeftX() + 10, m_box.getUpperRightY() - 10);
      utils->drawRectW(box);
      
      canvas->setTextPointSize(12);
      canvas->setTextColor(te::color::RGBAColor(0, 0, 0, 255));
      std::string* name = const_cast<std::string*>(rule->getName());
      std::string n = symb->getName();
      if(name)
        canvas->drawText(m_box.getLowerLeftX() + 15, m_box.getUpperRightY() - 20, name->c_str(), 0);
    } // end for each <Symbolizer>

  }   // end for each <Rule>

}

te::layout::Properties* te::layout::LegendModel::getProperties() const
{
  ItemModelObservable::getProperties();

  Property pro_mapName;
  pro_mapName.setName(m_sharedProps->getMapName());
  pro_mapName.setId("");
  pro_mapName.setValue(m_mapName, DataTypeStringList);
  Variant v;
  v.setValue(m_mapName, DataTypeString);
  pro_mapName.addOption(v);
  
  m_properties->addProperty(pro_mapName);

  return m_properties;
}

void te::layout::LegendModel::updateProperties( te::layout::Properties* properties )
{
  ItemModelObservable::updateProperties(properties);

  Properties* vectorProps = const_cast<Properties*>(properties);

  Property pro_mapName = vectorProps->contains(m_sharedProps->getMapName());

  if(!pro_mapName.isNull())
  {
    m_mapName = pro_mapName.getOptionByCurrentChoice().toString();
  }
}

void te::layout::LegendModel::visitDependent()
{
  MapModel* map = dynamic_cast<MapModel*>(m_visitable);

  if(map)
  {
    m_layer = map->getLayer();

    ContextItem contx;

    draw(contx);

    ContextItem contextNotify;
    contextNotify.setWait(true);
    notifyAll(contextNotify);
  } 
}

void te::layout::LegendModel::setBorderDisplacement( double value )
{
  m_borderDisplacement = value;
}

double te::layout::LegendModel::getBorderDisplacement()
{
  return m_borderDisplacement;
}

void te::layout::LegendModel::setDisplacementBetweenSymbols( double value )
{
  m_displacementBetweenSymbols = value;
}

double te::layout::LegendModel::getDisplacementBetweenSymbols()
{
  return m_displacementBetweenSymbols;
}

void te::layout::LegendModel::setDisplacementBetweenTitleAndSymbols( double value )
{
  m_displacementBetweenTitleAndSymbols = value;
}

double te::layout::LegendModel::getDisplacementBetweenTitleAndSymbols()
{
  return m_displacementBetweenTitleAndSymbols;
}

void te::layout::LegendModel::setDisplacementBetweenSymbolAndText( double value )
{
  m_displacementBetweenSymbolsAndText = value;
}

double te::layout::LegendModel::getDisplacementBetweenSymbolAndText()
{
  return m_displacementBetweenSymbolsAndText;
}