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qgscategorizedsymbolrendererv2.cpp
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qgscategorizedsymbolrendererv2.cpp
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/***************************************************************************
qgscategorizedsymbolrendererv2.cpp
---------------------
begin : November 2009
copyright : (C) 2009 by Martin Dobias
email : wonder dot sk at gmail dot 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 <algorithm>
#include "qgscategorizedsymbolrendererv2.h"
#include "qgssymbolv2.h"
#include "qgssymbollayerv2utils.h"
#include "qgsvectorcolorrampv2.h"
#include "qgsfeature.h"
#include "qgsvectorlayer.h"
#include "qgslogger.h"
#include <QDomDocument>
#include <QDomElement>
#include <QSettings> // for legend
QgsRendererCategoryV2::QgsRendererCategoryV2()
: mValue(), mSymbol( 0 ), mLabel()
{
}
QgsRendererCategoryV2::QgsRendererCategoryV2( QVariant value, QgsSymbolV2* symbol, QString label )
: mValue( value ), mSymbol( symbol ), mLabel( label )
{
}
QgsRendererCategoryV2::QgsRendererCategoryV2( const QgsRendererCategoryV2& cat )
: mValue( cat.mValue ), mSymbol( 0 ), mLabel( cat.mLabel )
{
if ( cat.mSymbol )
{
mSymbol = cat.mSymbol->clone();
}
}
QgsRendererCategoryV2::~QgsRendererCategoryV2()
{
delete mSymbol;
}
QgsRendererCategoryV2& QgsRendererCategoryV2::operator=( const QgsRendererCategoryV2 & cat )
{
mValue = cat.mValue;
mLabel = cat.mLabel;
mSymbol = 0;
if ( cat.mSymbol )
{
mSymbol = cat.mSymbol->clone();
}
return *this;
}
QVariant QgsRendererCategoryV2::value() const
{
return mValue;
}
QgsSymbolV2* QgsRendererCategoryV2::symbol() const
{
return mSymbol;
}
QString QgsRendererCategoryV2::label() const
{
return mLabel;
}
void QgsRendererCategoryV2::setValue( const QVariant &value )
{
mValue = value;
}
void QgsRendererCategoryV2::setSymbol( QgsSymbolV2* s )
{
if ( mSymbol == s )
return;
delete mSymbol;
mSymbol = s;
}
void QgsRendererCategoryV2::setLabel( const QString &label )
{
mLabel = label;
}
QString QgsRendererCategoryV2::dump() const
{
return QString( "%1::%2::%3\n" ).arg( mValue.toString() ).arg( mLabel ).arg( mSymbol->dump() );
}
void QgsRendererCategoryV2::toSld( QDomDocument &doc, QDomElement &element, QgsStringMap props ) const
{
if ( !mSymbol || props.value( "attribute", "" ).isEmpty() )
return;
QString attrName = props[ "attribute" ];
QDomElement ruleElem = doc.createElement( "se:Rule" );
element.appendChild( ruleElem );
QDomElement nameElem = doc.createElement( "se:Name" );
nameElem.appendChild( doc.createTextNode( mLabel ) );
ruleElem.appendChild( nameElem );
QDomElement descrElem = doc.createElement( "se:Description" );
QDomElement titleElem = doc.createElement( "se:Title" );
QString descrStr = QString( "%1 is '%2'" ).arg( attrName ).arg( mValue.toString() );
titleElem.appendChild( doc.createTextNode( !mLabel.isEmpty() ? mLabel : descrStr ) );
descrElem.appendChild( titleElem );
ruleElem.appendChild( descrElem );
// create the ogc:Filter for the range
QString filterFunc = QString( "%1 = '%2'" )
.arg( attrName.replace( "\"", "\"\"" ) )
.arg( mValue.toString().replace( "'", "''" ) );
QgsSymbolLayerV2Utils::createFunctionElement( doc, ruleElem, filterFunc );
mSymbol->toSld( doc, ruleElem, props );
}
///////////////////
QgsCategorizedSymbolRendererV2::QgsCategorizedSymbolRendererV2( QString attrName, QgsCategoryList categories )
: QgsFeatureRendererV2( "categorizedSymbol" ),
mAttrName( attrName ),
mCategories( categories ),
mSourceSymbol( NULL ),
mSourceColorRamp( NULL ),
mInvertedColorRamp( false ),
mScaleMethod( DEFAULT_SCALE_METHOD ),
mExpression( 0 ),
mRotationFieldIdx( -1 ),
mSizeScaleFieldIdx( -1 )
{
for ( int i = 0; i < mCategories.count(); ++i )
{
QgsRendererCategoryV2& cat = mCategories[i];
if ( cat.symbol() == NULL )
{
QgsDebugMsg( "invalid symbol in a category! ignoring..." );
mCategories.removeAt( i-- );
}
//mCategories.insert(cat.value().toString(), cat);
}
}
QgsCategorizedSymbolRendererV2::~QgsCategorizedSymbolRendererV2()
{
mCategories.clear(); // this should also call destructors of symbols
delete mSourceSymbol;
delete mSourceColorRamp;
}
void QgsCategorizedSymbolRendererV2::rebuildHash()
{
mSymbolHash.clear();
for ( int i = 0; i < mCategories.count(); ++i )
{
QgsRendererCategoryV2& cat = mCategories[i];
mSymbolHash.insert( cat.value().toString(), cat.symbol() );
}
}
QgsSymbolV2* QgsCategorizedSymbolRendererV2::symbolForValue( QVariant value )
{
// TODO: special case for int, double
QHash<QString, QgsSymbolV2*>::iterator it = mSymbolHash.find( value.toString() );
if ( it == mSymbolHash.end() )
{
if ( mSymbolHash.count() == 0 )
{
QgsDebugMsg( "there are no hashed symbols!!!" );
}
else
{
QgsDebugMsgLevel( "attribute value not found: " + value.toString(), 3 );
}
return NULL;
}
return *it;
}
QgsSymbolV2* QgsCategorizedSymbolRendererV2::symbolForFeature( QgsFeature& feature )
{
const QgsAttributes& attrs = feature.attributes();
QVariant value;
if ( mAttrNum == -1 )
{
Q_ASSERT( mExpression );
value = mExpression->evaluate( &feature );
}
else
{
value = attrs[mAttrNum];
}
// find the right symbol for the category
QgsSymbolV2* symbol = symbolForValue( value );
if ( symbol == NULL )
{
// if no symbol found use default one
return symbolForValue( QVariant( "" ) );
}
if ( mRotationFieldIdx == -1 && mSizeScaleFieldIdx == -1 )
return symbol; // no data-defined rotation/scaling - just return the symbol
// find out rotation, size scale
double rotation = 0;
double sizeScale = 1;
if ( mRotationFieldIdx != -1 )
rotation = attrs[mRotationFieldIdx].toDouble();
if ( mSizeScaleFieldIdx != -1 )
sizeScale = attrs[mSizeScaleFieldIdx].toDouble();
// take a temporary symbol (or create it if doesn't exist)
QgsSymbolV2* tempSymbol = mTempSymbols[attrs[mAttrNum].toString()];
// modify the temporary symbol and return it
if ( tempSymbol->type() == QgsSymbolV2::Marker )
{
QgsMarkerSymbolV2* markerSymbol = static_cast<QgsMarkerSymbolV2*>( tempSymbol );
if ( mRotationFieldIdx != -1 )
markerSymbol->setAngle( rotation );
if ( mSizeScaleFieldIdx != -1 )
markerSymbol->setSize( sizeScale * static_cast<QgsMarkerSymbolV2*>( symbol )->size() );
markerSymbol->setScaleMethod( mScaleMethod );
}
else if ( tempSymbol->type() == QgsSymbolV2::Line )
{
QgsLineSymbolV2* lineSymbol = static_cast<QgsLineSymbolV2*>( tempSymbol );
if ( mSizeScaleFieldIdx != -1 )
lineSymbol->setWidth( sizeScale * static_cast<QgsLineSymbolV2*>( symbol )->width() );
}
return tempSymbol;
}
int QgsCategorizedSymbolRendererV2::categoryIndexForValue( QVariant val )
{
for ( int i = 0; i < mCategories.count(); i++ )
{
if ( mCategories[i].value() == val )
return i;
}
return -1;
}
bool QgsCategorizedSymbolRendererV2::updateCategoryValue( int catIndex, const QVariant &value )
{
if ( catIndex < 0 || catIndex >= mCategories.size() )
return false;
mCategories[catIndex].setValue( value );
return true;
}
bool QgsCategorizedSymbolRendererV2::updateCategorySymbol( int catIndex, QgsSymbolV2* symbol )
{
if ( catIndex < 0 || catIndex >= mCategories.size() )
return false;
mCategories[catIndex].setSymbol( symbol );
return true;
}
bool QgsCategorizedSymbolRendererV2::updateCategoryLabel( int catIndex, QString label )
{
if ( catIndex < 0 || catIndex >= mCategories.size() )
return false;
mCategories[catIndex].setLabel( label );
return true;
}
void QgsCategorizedSymbolRendererV2::addCategory( const QgsRendererCategoryV2 &cat )
{
if ( cat.symbol() == NULL )
{
QgsDebugMsg( "invalid symbol in a category! ignoring..." );
}
else
{
mCategories.append( cat );
}
}
bool QgsCategorizedSymbolRendererV2::deleteCategory( int catIndex )
{
if ( catIndex < 0 || catIndex >= mCategories.size() )
return false;
mCategories.removeAt( catIndex );
return true;
}
void QgsCategorizedSymbolRendererV2::deleteAllCategories()
{
mCategories.clear();
}
void QgsCategorizedSymbolRendererV2::moveCategory( int from, int to )
{
if ( from < 0 || from >= mCategories.size() || to < 0 || to >= mCategories.size() ) return;
mCategories.move( from, to );
}
bool valueLessThan( const QgsRendererCategoryV2 &c1, const QgsRendererCategoryV2 &c2 )
{
return qgsVariantLessThan( c1.value(), c2.value() );
}
bool valueGreaterThan( const QgsRendererCategoryV2 &c1, const QgsRendererCategoryV2 &c2 )
{
return qgsVariantGreaterThan( c1.value(), c2.value() );
}
void QgsCategorizedSymbolRendererV2::sortByValue( Qt::SortOrder order )
{
if ( order == Qt::AscendingOrder )
{
qSort( mCategories.begin(), mCategories.end(), valueLessThan );
}
else
{
qSort( mCategories.begin(), mCategories.end(), valueGreaterThan );
}
}
bool labelLessThan( const QgsRendererCategoryV2 &c1, const QgsRendererCategoryV2 &c2 )
{
return QString::localeAwareCompare( c1.label(), c2.label() ) < 0;
}
bool labelGreaterThan( const QgsRendererCategoryV2 &c1, const QgsRendererCategoryV2 &c2 )
{
return !labelLessThan( c1, c2 );
}
void QgsCategorizedSymbolRendererV2::sortByLabel( Qt::SortOrder order )
{
if ( order == Qt::AscendingOrder )
{
qSort( mCategories.begin(), mCategories.end(), labelLessThan );
}
else
{
qSort( mCategories.begin(), mCategories.end(), labelGreaterThan );
}
}
void QgsCategorizedSymbolRendererV2::startRender( QgsRenderContext& context, const QgsVectorLayer *vlayer )
{
// make sure that the hash table is up to date
rebuildHash();
// find out classification attribute index from name
mAttrNum = vlayer ? vlayer->fieldNameIndex( mAttrName ) : -1;
if ( mAttrNum == -1 )
{
mExpression = new QgsExpression( mAttrName );
mExpression->prepare( vlayer->pendingFields() );
}
mRotationFieldIdx = ( mRotationField.isEmpty() ? -1 : vlayer->fieldNameIndex( mRotationField ) );
mSizeScaleFieldIdx = ( mSizeScaleField.isEmpty() ? -1 : vlayer->fieldNameIndex( mSizeScaleField ) );
QgsCategoryList::iterator it = mCategories.begin();
for ( ; it != mCategories.end(); ++it )
{
it->symbol()->startRender( context, vlayer );
if ( mRotationFieldIdx != -1 || mSizeScaleFieldIdx != -1 )
{
QgsSymbolV2* tempSymbol = it->symbol()->clone();
tempSymbol->setRenderHints(( mRotationFieldIdx != -1 ? QgsSymbolV2::DataDefinedRotation : 0 ) |
( mSizeScaleFieldIdx != -1 ? QgsSymbolV2::DataDefinedSizeScale : 0 ) );
tempSymbol->startRender( context, vlayer );
mTempSymbols[ it->value().toString()] = tempSymbol;
}
}
}
void QgsCategorizedSymbolRendererV2::stopRender( QgsRenderContext& context )
{
QgsCategoryList::iterator it = mCategories.begin();
for ( ; it != mCategories.end(); ++it )
it->symbol()->stopRender( context );
// cleanup mTempSymbols
QHash<QString, QgsSymbolV2*>::iterator it2 = mTempSymbols.begin();
for ( ; it2 != mTempSymbols.end(); ++it2 )
{
it2.value()->stopRender( context );
delete it2.value();
}
mTempSymbols.clear();
delete mExpression;
}
QList<QString> QgsCategorizedSymbolRendererV2::usedAttributes()
{
QSet<QString> attributes;
QgsExpression exp( mAttrName );
foreach ( QString attr, exp.referencedColumns() )
{
attributes << attr;
}
if ( !mRotationField.isEmpty() )
{
attributes.insert( mRotationField );
}
if ( !mSizeScaleField.isEmpty() )
{
attributes.insert( mSizeScaleField );
}
QgsCategoryList::const_iterator catIt = mCategories.constBegin();
for ( ; catIt != mCategories.constEnd(); ++catIt )
{
QgsSymbolV2* catSymbol = catIt->symbol();
if ( catSymbol )
{
attributes.unite( catSymbol->usedAttributes() );
}
}
return attributes.toList();
}
QString QgsCategorizedSymbolRendererV2::dump() const
{
QString s = QString( "CATEGORIZED: idx %1\n" ).arg( mAttrName );
for ( int i = 0; i < mCategories.count(); i++ )
s += mCategories[i].dump();
return s;
}
QgsFeatureRendererV2* QgsCategorizedSymbolRendererV2::clone()
{
QgsCategorizedSymbolRendererV2* r = new QgsCategorizedSymbolRendererV2( mAttrName, mCategories );
if ( mSourceSymbol )
r->setSourceSymbol( mSourceSymbol->clone() );
if ( mSourceColorRamp )
{
r->setSourceColorRamp( mSourceColorRamp->clone() );
r->setInvertedColorRamp( mInvertedColorRamp );
}
r->setUsingSymbolLevels( usingSymbolLevels() );
r->setRotationField( rotationField() );
r->setSizeScaleField( sizeScaleField() );
r->setScaleMethod( scaleMethod() );
return r;
}
void QgsCategorizedSymbolRendererV2::toSld( QDomDocument &doc, QDomElement &element ) const
{
QgsStringMap props;
props[ "attribute" ] = mAttrName;
if ( !mRotationField.isEmpty() )
props[ "angle" ] = QString( mRotationField ).append( "\"" ).prepend( "\"" );
if ( !mSizeScaleField.isEmpty() )
props[ "scale" ] = QString( mSizeScaleField ).append( "\"" ).prepend( "\"" );
// create a Rule for each range
for ( QgsCategoryList::const_iterator it = mCategories.constBegin(); it != mCategories.constEnd(); ++it )
{
QgsStringMap catProps( props );
it->toSld( doc, element, catProps );
}
}
QgsSymbolV2List QgsCategorizedSymbolRendererV2::symbols()
{
QgsSymbolV2List lst;
for ( int i = 0; i < mCategories.count(); i++ )
lst.append( mCategories[i].symbol() );
return lst;
}
QgsFeatureRendererV2* QgsCategorizedSymbolRendererV2::create( QDomElement& element )
{
QDomElement symbolsElem = element.firstChildElement( "symbols" );
if ( symbolsElem.isNull() )
return NULL;
QDomElement catsElem = element.firstChildElement( "categories" );
if ( catsElem.isNull() )
return NULL;
QgsSymbolV2Map symbolMap = QgsSymbolLayerV2Utils::loadSymbols( symbolsElem );
QgsCategoryList cats;
QDomElement catElem = catsElem.firstChildElement();
while ( !catElem.isNull() )
{
if ( catElem.tagName() == "category" )
{
QVariant value = QVariant( catElem.attribute( "value" ) );
QString symbolName = catElem.attribute( "symbol" );
QString label = catElem.attribute( "label" );
if ( symbolMap.contains( symbolName ) )
{
QgsSymbolV2* symbol = symbolMap.take( symbolName );
cats.append( QgsRendererCategoryV2( value, symbol, label ) );
}
}
catElem = catElem.nextSiblingElement();
}
QString attrName = element.attribute( "attr" );
QgsCategorizedSymbolRendererV2* r = new QgsCategorizedSymbolRendererV2( attrName, cats );
// delete symbols if there are any more
QgsSymbolLayerV2Utils::clearSymbolMap( symbolMap );
// try to load source symbol (optional)
QDomElement sourceSymbolElem = element.firstChildElement( "source-symbol" );
if ( !sourceSymbolElem.isNull() )
{
QgsSymbolV2Map sourceSymbolMap = QgsSymbolLayerV2Utils::loadSymbols( sourceSymbolElem );
if ( sourceSymbolMap.contains( "0" ) )
{
r->setSourceSymbol( sourceSymbolMap.take( "0" ) );
}
QgsSymbolLayerV2Utils::clearSymbolMap( sourceSymbolMap );
}
// try to load color ramp (optional)
QDomElement sourceColorRampElem = element.firstChildElement( "colorramp" );
if ( !sourceColorRampElem.isNull() && sourceColorRampElem.attribute( "name" ) == "[source]" )
{
r->setSourceColorRamp( QgsSymbolLayerV2Utils::loadColorRamp( sourceColorRampElem ) );
QDomElement invertedColorRampElem = element.firstChildElement( "invertedcolorramp" );
if ( !invertedColorRampElem.isNull() )
r->setInvertedColorRamp( invertedColorRampElem.attribute( "value" ) == "1" );
}
QDomElement rotationElem = element.firstChildElement( "rotation" );
if ( !rotationElem.isNull() )
r->setRotationField( rotationElem.attribute( "field" ) );
QDomElement sizeScaleElem = element.firstChildElement( "sizescale" );
if ( !sizeScaleElem.isNull() )
{
r->setSizeScaleField( sizeScaleElem.attribute( "field" ) );
r->setScaleMethod( QgsSymbolLayerV2Utils::decodeScaleMethod( sizeScaleElem.attribute( "scalemethod" ) ) );
}
// TODO: symbol levels
return r;
}
QDomElement QgsCategorizedSymbolRendererV2::save( QDomDocument& doc )
{
QDomElement rendererElem = doc.createElement( RENDERER_TAG_NAME );
rendererElem.setAttribute( "type", "categorizedSymbol" );
rendererElem.setAttribute( "symbollevels", ( mUsingSymbolLevels ? "1" : "0" ) );
rendererElem.setAttribute( "attr", mAttrName );
// categories
int i = 0;
QgsSymbolV2Map symbols;
QDomElement catsElem = doc.createElement( "categories" );
QgsCategoryList::const_iterator it = mCategories.constBegin();
for ( ; it != mCategories.end(); ++it )
{
const QgsRendererCategoryV2& cat = *it;
QString symbolName = QString::number( i );
symbols.insert( symbolName, cat.symbol() );
QDomElement catElem = doc.createElement( "category" );
catElem.setAttribute( "value", cat.value().toString() );
catElem.setAttribute( "symbol", symbolName );
catElem.setAttribute( "label", cat.label() );
catsElem.appendChild( catElem );
i++;
}
rendererElem.appendChild( catsElem );
// save symbols
QDomElement symbolsElem = QgsSymbolLayerV2Utils::saveSymbols( symbols, "symbols", doc );
rendererElem.appendChild( symbolsElem );
// save source symbol
if ( mSourceSymbol )
{
QgsSymbolV2Map sourceSymbols;
sourceSymbols.insert( "0", mSourceSymbol );
QDomElement sourceSymbolElem = QgsSymbolLayerV2Utils::saveSymbols( sourceSymbols, "source-symbol", doc );
rendererElem.appendChild( sourceSymbolElem );
}
// save source color ramp
if ( mSourceColorRamp )
{
QDomElement colorRampElem = QgsSymbolLayerV2Utils::saveColorRamp( "[source]", mSourceColorRamp, doc );
rendererElem.appendChild( colorRampElem );
QDomElement invertedElem = doc.createElement( "invertedcolorramp" );
invertedElem.setAttribute( "value", mInvertedColorRamp );
rendererElem.appendChild( invertedElem );
}
QDomElement rotationElem = doc.createElement( "rotation" );
rotationElem.setAttribute( "field", mRotationField );
rendererElem.appendChild( rotationElem );
QDomElement sizeScaleElem = doc.createElement( "sizescale" );
sizeScaleElem.setAttribute( "field", mSizeScaleField );
sizeScaleElem.setAttribute( "scalemethod", QgsSymbolLayerV2Utils::encodeScaleMethod( mScaleMethod ) );
rendererElem.appendChild( sizeScaleElem );
return rendererElem;
}
QgsLegendSymbologyList QgsCategorizedSymbolRendererV2::legendSymbologyItems( QSize iconSize )
{
QSettings settings;
bool showClassifiers = settings.value( "/qgis/showLegendClassifiers", false ).toBool();
QgsLegendSymbologyList lst;
if ( showClassifiers )
{
lst << qMakePair( classAttribute(), QPixmap() );
}
int count = categories().count();
for ( int i = 0; i < count; i++ )
{
const QgsRendererCategoryV2& cat = categories()[i];
QPixmap pix = QgsSymbolLayerV2Utils::symbolPreviewPixmap( cat.symbol(), iconSize );
lst << qMakePair( cat.label(), pix );
}
return lst;
}
QgsLegendSymbolList QgsCategorizedSymbolRendererV2::legendSymbolItems( double scaleDenominator, QString rule )
{
Q_UNUSED( scaleDenominator );
QSettings settings;
bool showClassifiers = settings.value( "/qgis/showLegendClassifiers", false ).toBool();
QgsLegendSymbolList lst;
if ( showClassifiers )
{
lst << qMakePair( classAttribute(), ( QgsSymbolV2* )0 );
}
foreach ( const QgsRendererCategoryV2& cat, mCategories )
{
if ( rule.isEmpty() || cat.label() == rule )
{
lst << qMakePair( cat.label(), cat.symbol() );
}
}
return lst;
}
QgsSymbolV2* QgsCategorizedSymbolRendererV2::sourceSymbol()
{
return mSourceSymbol;
}
void QgsCategorizedSymbolRendererV2::setSourceSymbol( QgsSymbolV2* sym )
{
delete mSourceSymbol;
mSourceSymbol = sym;
}
QgsVectorColorRampV2* QgsCategorizedSymbolRendererV2::sourceColorRamp()
{
return mSourceColorRamp;
}
void QgsCategorizedSymbolRendererV2::setSourceColorRamp( QgsVectorColorRampV2* ramp )
{
delete mSourceColorRamp;
mSourceColorRamp = ramp;
}
void QgsCategorizedSymbolRendererV2::updateSymbols( QgsSymbolV2 * sym )
{
int i = 0;
foreach ( QgsRendererCategoryV2 cat, mCategories )
{
QgsSymbolV2* symbol = sym->clone();
symbol->setColor( cat.symbol()->color() );
updateCategorySymbol( i, symbol );
++i;
}
}
void QgsCategorizedSymbolRendererV2::setScaleMethod( QgsSymbolV2::ScaleMethod scaleMethod )
{
mScaleMethod = scaleMethod;
QgsCategoryList::const_iterator catIt = mCategories.constBegin();
for ( ; catIt != mCategories.constEnd(); ++catIt )
{
setScaleMethodToSymbol( catIt->symbol(), scaleMethod );
}
}