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qgsrendererv2.cpp
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qgsrendererv2.cpp
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/***************************************************************************
qgsrendererv2.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 "qgsrendererv2.h"
#include "qgssymbolv2.h"
#include "qgssymbollayerv2utils.h"
#include "qgssinglesymbolrendererv2.h" // for default renderer
#include "qgsrendererv2registry.h"
#include "qgsrendercontext.h"
#include "qgsclipper.h"
#include "qgsgeometry.h"
#include "qgsfeature.h"
#include "qgslogger.h"
#include "qgsvectorlayer.h"
#include <QDomElement>
#include <QDomDocument>
#include <QPolygonF>
const unsigned char* QgsFeatureRendererV2::_getPoint( QPointF& pt, QgsRenderContext& context, const unsigned char* wkb )
{
wkb++; // jump over endian info
unsigned int wkbType = *(( int* ) wkb );
wkb += sizeof( unsigned int );
double x = *(( double * ) wkb ); wkb += sizeof( double );
double y = *(( double * ) wkb ); wkb += sizeof( double );
if ( wkbType == QGis::WKBPolygon25D )
wkb += sizeof( double );
if ( context.coordinateTransform() )
{
double z = 0; // dummy variable for coordiante transform
context.coordinateTransform()->transformInPlace( x, y, z );
}
context.mapToPixel().transformInPlace( x, y );
pt = QPointF( x, y );
return wkb;
}
const unsigned char* QgsFeatureRendererV2::_getLineString( QPolygonF& pts, QgsRenderContext& context, const unsigned char* wkb )
{
wkb++; // jump over endian info
unsigned int wkbType = *(( int* ) wkb );
wkb += sizeof( unsigned int );
unsigned int nPoints = *(( int* ) wkb );
wkb += sizeof( unsigned int );
bool hasZValue = ( wkbType == QGis::WKBLineString25D );
double x, y;
const QgsCoordinateTransform* ct = context.coordinateTransform();
const QgsMapToPixel& mtp = context.mapToPixel();
//apply clipping for large lines to achieve a better rendering performance
if ( nPoints > 1 )
{
const QgsRectangle& e = context.extent();
double cw = e.width() / 10; double ch = e.height() / 10;
QgsRectangle clipRect( e.xMinimum() - cw, e.yMinimum() - ch, e.xMaximum() + cw, e.yMaximum() + ch );
wkb = QgsClipper::clippedLineWKB( wkb - ( 2 * sizeof( unsigned int ) + 1 ), clipRect, pts );
}
else
{
pts.resize( nPoints );
QPointF* ptr = pts.data();
for ( unsigned int i = 0; i < nPoints; ++i, ++ptr )
{
x = *(( double * ) wkb );
wkb += sizeof( double );
y = *(( double * ) wkb );
wkb += sizeof( double );
if ( hasZValue ) // ignore Z value
wkb += sizeof( double );
*ptr = QPointF( x, y );
}
}
//transform the QPolygonF to screen coordinates
if ( ct )
{
ct->transformPolygon( pts );
}
QPointF* ptr = pts.data();
for ( int i = 0; i < pts.size(); ++i, ++ptr )
{
mtp.transformInPlace( ptr->rx(), ptr->ry() );
}
return wkb;
}
const unsigned char* QgsFeatureRendererV2::_getPolygon( QPolygonF& pts, QList<QPolygonF>& holes, QgsRenderContext& context, const unsigned char* wkb )
{
wkb++; // jump over endian info
unsigned int wkbType = *(( int* ) wkb );
wkb += sizeof( unsigned int ); // jump over wkb type
unsigned int numRings = *(( int* ) wkb );
wkb += sizeof( unsigned int );
if ( numRings == 0 ) // sanity check for zero rings in polygon
return wkb;
bool hasZValue = ( wkbType == QGis::WKBPolygon25D );
double x, y;
holes.clear();
const QgsCoordinateTransform* ct = context.coordinateTransform();
const QgsMapToPixel& mtp = context.mapToPixel();
const QgsRectangle& e = context.extent();
double cw = e.width() / 10; double ch = e.height() / 10;
QgsRectangle clipRect( e.xMinimum() - cw, e.yMinimum() - ch, e.xMaximum() + cw, e.yMaximum() + ch );
for ( unsigned int idx = 0; idx < numRings; idx++ )
{
unsigned int nPoints = *(( int* )wkb );
wkb += sizeof( unsigned int );
QPolygonF poly( nPoints );
// Extract the points from the WKB and store in a pair of vectors.
QPointF* ptr = poly.data();
for ( unsigned int jdx = 0; jdx < nPoints; ++jdx, ++ptr )
{
x = *(( double * ) wkb ); wkb += sizeof( double );
y = *(( double * ) wkb ); wkb += sizeof( double );
*ptr = QPointF( x, y );
if ( hasZValue )
wkb += sizeof( double );
}
if ( nPoints < 1 )
continue;
//clip close to view extent
QgsClipper::trimPolygon( poly, clipRect );
//transform the QPolygonF to screen coordinates
if ( ct )
{
ct->transformPolygon( poly );
}
ptr = poly.data();
for ( int i = 0; i < poly.size(); ++i, ++ptr )
{
mtp.transformInPlace( ptr->rx(), ptr->ry() );
}
if ( idx == 0 )
pts = poly;
else
holes.append( poly );
}
return wkb;
}
void QgsFeatureRendererV2::setScaleMethodToSymbol( QgsSymbolV2* symbol, int scaleMethod )
{
if ( symbol )
{
if ( symbol->type() == QgsSymbolV2::Marker )
{
QgsMarkerSymbolV2* ms = static_cast<QgsMarkerSymbolV2*>( symbol );
if ( ms )
{
ms->setScaleMethod(( QgsSymbolV2::ScaleMethod )scaleMethod );
}
}
}
}
QgsFeatureRendererV2::QgsFeatureRendererV2( QString type )
: mType( type ), mUsingSymbolLevels( false ),
mCurrentVertexMarkerType( QgsVectorLayer::Cross ),
mCurrentVertexMarkerSize( 3 )
{
}
QgsFeatureRendererV2* QgsFeatureRendererV2::defaultRenderer( QGis::GeometryType geomType )
{
return new QgsSingleSymbolRendererV2( QgsSymbolV2::defaultSymbol( geomType ) );
}
bool QgsFeatureRendererV2::renderFeature( QgsFeature& feature, QgsRenderContext& context, int layer, bool selected, bool drawVertexMarker )
{
QgsSymbolV2* symbol = symbolForFeature( feature );
if ( symbol == NULL )
return false;
renderFeatureWithSymbol( feature, symbol, context, layer, selected, drawVertexMarker );
return true;
}
void QgsFeatureRendererV2::renderFeatureWithSymbol( QgsFeature& feature, QgsSymbolV2* symbol, QgsRenderContext& context, int layer, bool selected, bool drawVertexMarker )
{
QgsSymbolV2::SymbolType symbolType = symbol->type();
QgsGeometry* geom = feature.geometry();
switch ( geom->wkbType() )
{
case QGis::WKBPoint:
case QGis::WKBPoint25D:
{
if ( symbolType != QgsSymbolV2::Marker )
{
QgsDebugMsg( "point can be drawn only with marker symbol!" );
break;
}
QPointF pt;
_getPoint( pt, context, geom->asWkb() );
(( QgsMarkerSymbolV2* )symbol )->renderPoint( pt, &feature, context, layer, selected );
//if ( drawVertexMarker )
// renderVertexMarker( pt, context );
}
break;
case QGis::WKBLineString:
case QGis::WKBLineString25D:
{
if ( symbolType != QgsSymbolV2::Line )
{
QgsDebugMsg( "linestring can be drawn only with line symbol!" );
break;
}
QPolygonF pts;
_getLineString( pts, context, geom->asWkb() );
(( QgsLineSymbolV2* )symbol )->renderPolyline( pts, &feature, context, layer, selected );
if ( drawVertexMarker )
renderVertexMarkerPolyline( pts, context );
}
break;
case QGis::WKBPolygon:
case QGis::WKBPolygon25D:
{
if ( symbolType != QgsSymbolV2::Fill )
{
QgsDebugMsg( "polygon can be drawn only with fill symbol!" );
break;
}
QPolygonF pts;
QList<QPolygonF> holes;
_getPolygon( pts, holes, context, geom->asWkb() );
(( QgsFillSymbolV2* )symbol )->renderPolygon( pts, ( holes.count() ? &holes : NULL ), &feature, context, layer, selected );
if ( drawVertexMarker )
renderVertexMarkerPolygon( pts, ( holes.count() ? &holes : NULL ), context );
}
break;
case QGis::WKBMultiPoint:
case QGis::WKBMultiPoint25D:
{
if ( symbolType != QgsSymbolV2::Marker )
{
QgsDebugMsg( "multi-point can be drawn only with marker symbol!" );
break;
}
const unsigned char* wkb = geom->asWkb();
unsigned int num = *(( int* )( wkb + 5 ) );
const unsigned char* ptr = wkb + 9;
QPointF pt;
for ( unsigned int i = 0; i < num; ++i )
{
ptr = _getPoint( pt, context, ptr );
(( QgsMarkerSymbolV2* )symbol )->renderPoint( pt, &feature, context, layer, selected );
//if ( drawVertexMarker )
// renderVertexMarker( pt, context );
}
}
break;
case QGis::WKBMultiLineString:
case QGis::WKBMultiLineString25D:
{
if ( symbolType != QgsSymbolV2::Line )
{
QgsDebugMsg( "multi-linestring can be drawn only with line symbol!" );
break;
}
const unsigned char* wkb = geom->asWkb();
unsigned int num = *(( int* )( wkb + 5 ) );
const unsigned char* ptr = wkb + 9;
QPolygonF pts;
for ( unsigned int i = 0; i < num; ++i )
{
ptr = _getLineString( pts, context, ptr );
(( QgsLineSymbolV2* )symbol )->renderPolyline( pts, &feature, context, layer, selected );
if ( drawVertexMarker )
renderVertexMarkerPolyline( pts, context );
}
}
break;
case QGis::WKBMultiPolygon:
case QGis::WKBMultiPolygon25D:
{
if ( symbolType != QgsSymbolV2::Fill )
{
QgsDebugMsg( "multi-polygon can be drawn only with fill symbol!" );
break;
}
const unsigned char* wkb = geom->asWkb();
unsigned int num = *(( int* )( wkb + 5 ) );
const unsigned char* ptr = wkb + 9;
QPolygonF pts;
QList<QPolygonF> holes;
for ( unsigned int i = 0; i < num; ++i )
{
ptr = _getPolygon( pts, holes, context, ptr );
(( QgsFillSymbolV2* )symbol )->renderPolygon( pts, ( holes.count() ? &holes : NULL ), &feature, context, layer, selected );
if ( drawVertexMarker )
renderVertexMarkerPolygon( pts, ( holes.count() ? &holes : NULL ), context );
}
}
break;
default:
QgsDebugMsg( QString( "feature %1: unsupported wkb type 0x%2 for rendering" ).arg( feature.id() ).arg( geom->wkbType(), 0, 16 ) );
}
}
QString QgsFeatureRendererV2::dump() const
{
return "UNKNOWN RENDERER\n";
}
QgsFeatureRendererV2* QgsFeatureRendererV2::load( QDomElement& element )
{
// <renderer-v2 type=""> ... </renderer-v2>
if ( element.isNull() )
return NULL;
// load renderer
QString rendererType = element.attribute( "type" );
QgsRendererV2AbstractMetadata* m = QgsRendererV2Registry::instance()->rendererMetadata( rendererType );
if ( m == NULL )
return NULL;
QgsFeatureRendererV2* r = m->createRenderer( element );
if ( r )
{
r->setUsingSymbolLevels( element.attribute( "symbollevels", "0" ).toInt() );
}
return r;
}
QDomElement QgsFeatureRendererV2::save( QDomDocument& doc )
{
// create empty renderer element
return doc.createElement( RENDERER_TAG_NAME );
}
QgsFeatureRendererV2* QgsFeatureRendererV2::loadSld( const QDomNode &node, QGis::GeometryType geomType, QString &errorMessage )
{
QDomElement element = node.toElement();
if ( element.isNull() )
return NULL;
// get the UserStyle element
QDomElement userStyleElem = element.firstChildElement( "UserStyle" );
if ( userStyleElem.isNull() )
{
// UserStyle element not found, nothing will be rendered
errorMessage = "Info: UserStyle element not found.";
return NULL;
}
// get the FeatureTypeStyle element
QDomElement featTypeStyleElem = userStyleElem.firstChildElement( "FeatureTypeStyle" );
if ( featTypeStyleElem.isNull() )
{
errorMessage = "Info: FeatureTypeStyle element not found.";
return NULL;
}
// use the RuleRenderer when more rules are present or the rule
// has filters or min/max scale denominators set,
// otherwise use the SingleSymbol renderer
bool needRuleRenderer = false;
int ruleCount = 0;
QDomElement ruleElem = featTypeStyleElem.firstChildElement( "Rule" );
while ( !ruleElem.isNull() )
{
ruleCount++;
// more rules present, use the RuleRenderer
if ( ruleCount > 1 )
{
QgsDebugMsg( "more Rule elements found: need a RuleRenderer" );
needRuleRenderer = true;
break;
}
QDomElement ruleChildElem = ruleElem.firstChildElement();
while ( !ruleChildElem.isNull() )
{
// rule has filter or min/max scale denominator, use the RuleRenderer
if ( ruleChildElem.localName() == "Filter" ||
ruleChildElem.localName() == "MinScaleDenominator" ||
ruleChildElem.localName() == "MaxScaleDenominator" )
{
QgsDebugMsg( "Filter or Min/MaxScaleDenominator element found: need a RuleRenderer" );
needRuleRenderer = true;
break;
}
ruleChildElem = ruleChildElem.nextSiblingElement();
}
if ( needRuleRenderer )
{
break;
}
ruleElem = ruleElem.nextSiblingElement( "Rule" );
}
QString rendererType;
if ( needRuleRenderer )
{
rendererType = "RuleRenderer";
}
else
{
rendererType = "singleSymbol";
}
QgsDebugMsg( QString( "Instantiating a '%1' renderer..." ).arg( rendererType ) );
// create the renderer and return it
QgsRendererV2AbstractMetadata* m = QgsRendererV2Registry::instance()->rendererMetadata( rendererType );
if ( m == NULL )
{
errorMessage = QString( "Error: Unable to get metadata for '%1' renderer." ).arg( rendererType );
return NULL;
}
QgsFeatureRendererV2* r = m->createRendererFromSld( featTypeStyleElem, geomType );
return r;
}
QDomElement QgsFeatureRendererV2::writeSld( QDomDocument& doc, const QgsVectorLayer &layer ) const
{
QDomElement userStyleElem = doc.createElement( "UserStyle" );
QDomElement nameElem = doc.createElement( "se:Name" );
nameElem.appendChild( doc.createTextNode( layer.name() ) );
userStyleElem.appendChild( nameElem );
QDomElement featureTypeStyleElem = doc.createElement( "se:FeatureTypeStyle" );
toSld( doc, featureTypeStyleElem );
userStyleElem.appendChild( featureTypeStyleElem );
return userStyleElem;
}
QgsLegendSymbologyList QgsFeatureRendererV2::legendSymbologyItems( QSize iconSize )
{
Q_UNUSED( iconSize );
// empty list by default
return QgsLegendSymbologyList();
}
QgsLegendSymbolList QgsFeatureRendererV2::legendSymbolItems()
{
return QgsLegendSymbolList();
}
void QgsFeatureRendererV2::setVertexMarkerAppearance( int type, int size )
{
mCurrentVertexMarkerType = type;
mCurrentVertexMarkerSize = size;
}
void QgsFeatureRendererV2::renderVertexMarker( QPointF& pt, QgsRenderContext& context )
{
QgsVectorLayer::drawVertexMarker( pt.x(), pt.y(), *context.painter(),
( QgsVectorLayer::VertexMarkerType ) mCurrentVertexMarkerType,
mCurrentVertexMarkerSize );
}
void QgsFeatureRendererV2::renderVertexMarkerPolyline( QPolygonF& pts, QgsRenderContext& context )
{
foreach ( QPointF pt, pts )
renderVertexMarker( pt, context );
}
void QgsFeatureRendererV2::renderVertexMarkerPolygon( QPolygonF& pts, QList<QPolygonF>* rings, QgsRenderContext& context )
{
foreach ( QPointF pt, pts )
renderVertexMarker( pt, context );
if ( rings )
{
foreach ( QPolygonF ring, *rings )
{
foreach ( QPointF pt, ring )
renderVertexMarker( pt, context );
}
}
}
QgsSymbolV2List QgsFeatureRendererV2::symbolsForFeature( QgsFeature& feat )
{
QgsSymbolV2List lst;
QgsSymbolV2* s = symbolForFeature( feat );
if ( s ) lst.append( s );
return lst;
}