src/core/symbology-ng/qgsvectorcolorrampv2.cpp

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/***************************************************************************
    qgsvectorcolorrampv2.cpp
    ---------------------
    begin                : November 2009
    copyright            : (C) 2009 by Martin Dobias
    email                : wonder.sk at gmail.com
 ***************************************************************************
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 ***************************************************************************/

#include "qgsvectorcolorrampv2.h"

#include "qgssymbollayerv2utils.h"

#include <stdlib.h> // for random()

QgsVectorGradientColorRampV2::QgsVectorGradientColorRampV2( QColor color1, QColor color2 )
    : mColor1( color1 ), mColor2( color2 )
{
}

QgsVectorColorRampV2* QgsVectorGradientColorRampV2::create( const QgsStringMap& props )
{
  QColor color1 = DEFAULT_GRADIENT_COLOR1;
  QColor color2 = DEFAULT_GRADIENT_COLOR2;
  if ( props.contains( "color1" ) )
    color1 = QgsSymbolLayerV2Utils::decodeColor( props["color1"] );
  if ( props.contains( "color2" ) )
    color2 = QgsSymbolLayerV2Utils::decodeColor( props["color2"] );

  StopsMap stops;
  if ( props.contains( "stops" ) )
  {
    foreach( QString stop, props["stops"].split( ':' ) )
    {
      int i = stop.indexOf( ';' );
      if ( i == -1 )
        continue;

      QColor c = QgsSymbolLayerV2Utils::decodeColor( stop.mid( i + 1 ) );
      stops.insert( stop.left( i ).toDouble(), c );
    }
  }

  QgsVectorGradientColorRampV2* r = new QgsVectorGradientColorRampV2( color1, color2 );
  r->setStops( stops );
  return r;
}

static QColor _interpolate( QColor c1, QColor c2, double value )
{
  int r = ( int )( c1.red() + value * ( c2.red() - c1.red() ) );
  int g = ( int )( c1.green() + value * ( c2.green() - c1.green() ) );
  int b = ( int )( c1.blue() + value * ( c2.blue() - c1.blue() ) );

  return QColor::fromRgb( r, g, b );
}

QColor QgsVectorGradientColorRampV2::color( double value ) const
{
  if ( mStops.isEmpty() )
  {
    return _interpolate( mColor1, mColor2, value );
  }
  else
  {
    double lower = 0, upper;
    QColor c1 = mColor1, c2;
    for ( StopsMap::const_iterator it = mStops.begin(); it != mStops.end(); ++it )
    {
      if ( it.key() >= value )
      {
        upper = it.key();
        c2 = it.value();

        return upper == lower ? c1 : _interpolate( c1, c2, ( value - lower ) / ( upper - lower ) );
      }
      lower = it.key();
      c1 = it.value();
    }

    upper = 1;
    c2 = mColor2;
    return upper == lower ? c1 : _interpolate( c1, c2, ( value - lower ) / ( upper - lower ) );
  }
}

QgsVectorColorRampV2* QgsVectorGradientColorRampV2::clone() const
{
  QgsVectorGradientColorRampV2* r = new QgsVectorGradientColorRampV2( mColor1, mColor2 );
  r->setStops( mStops );
  return r;
}

QgsStringMap QgsVectorGradientColorRampV2::properties() const
{
  QgsStringMap map;
  map["color1"] = QgsSymbolLayerV2Utils::encodeColor( mColor1 );
  map["color2"] = QgsSymbolLayerV2Utils::encodeColor( mColor2 );
  if ( !mStops.isEmpty() )
  {
    QStringList lst;
    for ( StopsMap::const_iterator it = mStops.begin(); it != mStops.end(); ++it )
    {
      lst.append( QString( "%1;%2" ).arg( it.key() ).arg( QgsSymbolLayerV2Utils::encodeColor( it.value() ) ) );
    }
    map["stops"] = lst.join( ":" );
  }
  return map;
}



QgsVectorRandomColorRampV2::QgsVectorRandomColorRampV2( int count, int hueMin, int hueMax,
    int satMin, int satMax, int valMin, int valMax )
    : mCount( count ), mHueMin( hueMin ), mHueMax( hueMax ),
    mSatMin( satMin ), mSatMax( satMax ), mValMin( valMin ), mValMax( valMax )
{
  updateColors();
}

QgsVectorColorRampV2* QgsVectorRandomColorRampV2::create( const QgsStringMap& props )
{
  int count = DEFAULT_RANDOM_COUNT;
  int hueMin = DEFAULT_RANDOM_HUE_MIN, hueMax = DEFAULT_RANDOM_HUE_MAX;
  int satMin = DEFAULT_RANDOM_SAT_MIN, satMax = DEFAULT_RANDOM_SAT_MAX;
  int valMin = DEFAULT_RANDOM_VAL_MIN, valMax = DEFAULT_RANDOM_VAL_MAX;

  if ( props.contains( "count" ) ) count = props["count"].toInt();
  if ( props.contains( "hueMin" ) ) hueMin = props["hueMin"].toInt();
  if ( props.contains( "hueMax" ) ) hueMax = props["hueMax"].toInt();
  if ( props.contains( "satMin" ) ) satMin = props["satMin"].toInt();
  if ( props.contains( "satMax" ) ) satMax = props["satMax"].toInt();
  if ( props.contains( "valMin" ) ) valMin = props["valMin"].toInt();
  if ( props.contains( "valMax" ) ) valMax = props["valMax"].toInt();

  return new QgsVectorRandomColorRampV2( count, hueMin, hueMax, satMin, satMax, valMin, valMax );
}

QColor QgsVectorRandomColorRampV2::color( double value ) const
{
  int colorCnt = mColors.count();
  int colorIdx = ( int )( value * colorCnt );

  if ( colorIdx >= 0 && colorIdx < colorCnt )
    return mColors.at( colorIdx );

  return QColor();
}

QgsVectorColorRampV2* QgsVectorRandomColorRampV2::clone() const
{
  return new QgsVectorRandomColorRampV2( mCount, mHueMin, mHueMax, mSatMin, mSatMax, mValMin, mValMax );
}

QgsStringMap QgsVectorRandomColorRampV2::properties() const
{
  QgsStringMap map;
  map["count"] = QString::number( mCount );
  map["hueMin"] = QString::number( mHueMin );
  map["hueMax"] = QString::number( mHueMax );
  map["satMin"] = QString::number( mSatMin );
  map["satMax"] = QString::number( mSatMax );
  map["valMin"] = QString::number( mValMin );
  map["valMax"] = QString::number( mValMax );
  return map;
}

void QgsVectorRandomColorRampV2::updateColors()
{
  int h, s, v;

  mColors.clear();
  for ( int i = 0; i < mCount; i++ )
  {
    h = ( rand() % ( mHueMax - mHueMin + 1 ) ) + mHueMin;
    s = ( rand() % ( mSatMax - mSatMin + 1 ) ) + mSatMin;
    v = ( rand() % ( mValMax - mValMin + 1 ) ) + mValMin;
    mColors.append( QColor::fromHsv( h, s, v ) );
  }
}



QgsVectorColorBrewerColorRampV2::QgsVectorColorBrewerColorRampV2( QString schemeName, int colors )
    : mSchemeName( schemeName ), mColors( colors )
{
  loadPalette();
}

QgsVectorColorRampV2* QgsVectorColorBrewerColorRampV2::create( const QgsStringMap& props )
{
  QString schemeName = DEFAULT_COLORBREWER_SCHEMENAME;
  int colors = DEFAULT_COLORBREWER_COLORS;

  if ( props.contains( "schemeName" ) )
    schemeName = props["schemeName"];
  if ( props.contains( "colors" ) )
    colors = props["colors"].toInt();

  return new QgsVectorColorBrewerColorRampV2( schemeName, colors );
}

#include "qgscolorbrewerpalette.h"

void QgsVectorColorBrewerColorRampV2::loadPalette()
{
  mPalette = QgsColorBrewerPalette::listSchemeColors( mSchemeName, mColors );
}

QStringList QgsVectorColorBrewerColorRampV2::listSchemeNames()
{
  return QgsColorBrewerPalette::listSchemes();
}

QList<int> QgsVectorColorBrewerColorRampV2::listSchemeVariants( QString schemeName )
{
  return QgsColorBrewerPalette::listSchemeVariants( schemeName );
}

QColor QgsVectorColorBrewerColorRampV2::color( double value ) const
{
  if ( mPalette.isEmpty() || value < 0 || value > 1 )
    return QColor( 255, 0, 0 ); // red color as a warning :)

  int paletteEntry = ( int )( value * mPalette.count() );
  if ( paletteEntry >= mPalette.count() )
    paletteEntry = mPalette.count() - 1;
  return mPalette.at( paletteEntry );
}

QgsVectorColorRampV2* QgsVectorColorBrewerColorRampV2::clone() const
{
  return new QgsVectorColorBrewerColorRampV2( mSchemeName, mColors );
}

QgsStringMap QgsVectorColorBrewerColorRampV2::properties() const
{
  QgsStringMap map;
  map["schemeName"] = mSchemeName;
  map["colors"] = QString::number( mColors );
  return map;
}