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qgssymbollayerv2utils.cpp
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qgssymbollayerv2utils.cpp
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/***************************************************************************
qgssymbollayerv2utils.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 "qgssymbollayerv2utils.h"
#include "qgssymbollayerv2.h"
#include "qgssymbollayerv2registry.h"
#include "qgssymbolv2.h"
#include "qgsvectorcolorrampv2.h"
#include "qgsexpression.h"
#include "qgspainteffect.h"
#include "qgspainteffectregistry.h"
#include "qgsapplication.h"
#include "qgsproject.h"
#include "qgsogcutils.h"
#include "qgslogger.h"
#include "qgsrendercontext.h"
#include "qgsunittypes.h"
#include <QColor>
#include <QFont>
#include <QDomDocument>
#include <QDomNode>
#include <QDomElement>
#include <QIcon>
#include <QPainter>
#include <QSettings>
#include <QRegExp>
#include <QPicture>
QString QgsSymbolLayerV2Utils::encodeColor( const QColor& color )
{
return QString( "%1,%2,%3,%4" ).arg( color.red() ).arg( color.green() ).arg( color.blue() ).arg( color.alpha() );
}
QColor QgsSymbolLayerV2Utils::decodeColor( const QString& str )
{
QStringList lst = str.split( ',' );
if ( lst.count() < 3 )
{
return QColor( str );
}
int red, green, blue, alpha;
red = lst[0].toInt();
green = lst[1].toInt();
blue = lst[2].toInt();
alpha = 255;
if ( lst.count() > 3 )
{
alpha = lst[3].toInt();
}
return QColor( red, green, blue, alpha );
}
QString QgsSymbolLayerV2Utils::encodeSldAlpha( int alpha )
{
return QString::number( alpha / 255.0, 'f', 2 );
}
int QgsSymbolLayerV2Utils::decodeSldAlpha( const QString& str )
{
bool ok;
double alpha = str.toDouble( &ok );
if ( !ok || alpha > 1 )
alpha = 255;
else if ( alpha < 0 )
alpha = 0;
return alpha * 255;
}
QString QgsSymbolLayerV2Utils::encodeSldFontStyle( QFont::Style style )
{
switch ( style )
{
case QFont::StyleNormal:
return "normal";
case QFont::StyleItalic:
return "italic";
case QFont::StyleOblique:
return "oblique";
default:
return "";
}
}
QFont::Style QgsSymbolLayerV2Utils::decodeSldFontStyle( const QString& str )
{
if ( str == "normal" ) return QFont::StyleNormal;
if ( str == "italic" ) return QFont::StyleItalic;
if ( str == "oblique" ) return QFont::StyleOblique;
return QFont::StyleNormal;
}
QString QgsSymbolLayerV2Utils::encodeSldFontWeight( int weight )
{
if ( weight == 50 ) return "normal";
if ( weight == 75 ) return "bold";
// QFont::Weight is between 0 and 99
// CSS font-weight is between 100 and 900
if ( weight < 0 ) return "100";
if ( weight > 99 ) return "900";
return QString::number( weight * 800 / 99 + 100 );
}
int QgsSymbolLayerV2Utils::decodeSldFontWeight( const QString& str )
{
bool ok;
int weight = str.toInt( &ok );
if ( !ok )
return static_cast< int >( QFont::Normal );
// CSS font-weight is between 100 and 900
// QFont::Weight is between 0 and 99
if ( weight > 900 ) return 99;
if ( weight < 100 ) return 0;
return ( weight - 100 ) * 99 / 800;
}
QString QgsSymbolLayerV2Utils::encodePenStyle( Qt::PenStyle style )
{
switch ( style )
{
case Qt::NoPen:
return "no";
case Qt::SolidLine:
return "solid";
case Qt::DashLine:
return "dash";
case Qt::DotLine:
return "dot";
case Qt::DashDotLine:
return "dash dot";
case Qt::DashDotDotLine:
return "dash dot dot";
default:
return "???";
}
}
Qt::PenStyle QgsSymbolLayerV2Utils::decodePenStyle( const QString& str )
{
if ( str == "no" ) return Qt::NoPen;
if ( str == "solid" ) return Qt::SolidLine;
if ( str == "dash" ) return Qt::DashLine;
if ( str == "dot" ) return Qt::DotLine;
if ( str == "dash dot" ) return Qt::DashDotLine;
if ( str == "dash dot dot" ) return Qt::DashDotDotLine;
return Qt::SolidLine;
}
QString QgsSymbolLayerV2Utils::encodePenJoinStyle( Qt::PenJoinStyle style )
{
switch ( style )
{
case Qt::BevelJoin:
return "bevel";
case Qt::MiterJoin:
return "miter";
case Qt::RoundJoin:
return "round";
default:
return "???";
}
}
Qt::PenJoinStyle QgsSymbolLayerV2Utils::decodePenJoinStyle( const QString& str )
{
if ( str == "bevel" ) return Qt::BevelJoin;
if ( str == "miter" ) return Qt::MiterJoin;
if ( str == "round" ) return Qt::RoundJoin;
return Qt::BevelJoin;
}
QString QgsSymbolLayerV2Utils::encodeSldLineJoinStyle( Qt::PenJoinStyle style )
{
switch ( style )
{
case Qt::BevelJoin:
return "bevel";
case Qt::MiterJoin:
return "mitre";
case Qt::RoundJoin:
return "round";
default:
return "";
}
}
Qt::PenJoinStyle QgsSymbolLayerV2Utils::decodeSldLineJoinStyle( const QString& str )
{
if ( str == "bevel" ) return Qt::BevelJoin;
if ( str == "mitre" ) return Qt::MiterJoin;
if ( str == "round" ) return Qt::RoundJoin;
return Qt::BevelJoin;
}
QString QgsSymbolLayerV2Utils::encodePenCapStyle( Qt::PenCapStyle style )
{
switch ( style )
{
case Qt::SquareCap:
return "square";
case Qt::FlatCap:
return "flat";
case Qt::RoundCap:
return "round";
default:
return "???";
}
}
Qt::PenCapStyle QgsSymbolLayerV2Utils::decodePenCapStyle( const QString& str )
{
if ( str == "square" ) return Qt::SquareCap;
if ( str == "flat" ) return Qt::FlatCap;
if ( str == "round" ) return Qt::RoundCap;
return Qt::SquareCap;
}
QString QgsSymbolLayerV2Utils::encodeSldLineCapStyle( Qt::PenCapStyle style )
{
switch ( style )
{
case Qt::SquareCap:
return "square";
case Qt::FlatCap:
return "butt";
case Qt::RoundCap:
return "round";
default:
return "";
}
}
Qt::PenCapStyle QgsSymbolLayerV2Utils::decodeSldLineCapStyle( const QString& str )
{
if ( str == "square" ) return Qt::SquareCap;
if ( str == "butt" ) return Qt::FlatCap;
if ( str == "round" ) return Qt::RoundCap;
return Qt::SquareCap;
}
QString QgsSymbolLayerV2Utils::encodeBrushStyle( Qt::BrushStyle style )
{
switch ( style )
{
case Qt::SolidPattern :
return "solid";
case Qt::HorPattern :
return "horizontal";
case Qt::VerPattern :
return "vertical";
case Qt::CrossPattern :
return "cross";
case Qt::BDiagPattern :
return "b_diagonal";
case Qt::FDiagPattern :
return "f_diagonal";
case Qt::DiagCrossPattern :
return "diagonal_x";
case Qt::Dense1Pattern :
return "dense1";
case Qt::Dense2Pattern :
return "dense2";
case Qt::Dense3Pattern :
return "dense3";
case Qt::Dense4Pattern :
return "dense4";
case Qt::Dense5Pattern :
return "dense5";
case Qt::Dense6Pattern :
return "dense6";
case Qt::Dense7Pattern :
return "dense7";
case Qt::NoBrush :
return "no";
default:
return "???";
}
}
Qt::BrushStyle QgsSymbolLayerV2Utils::decodeBrushStyle( const QString& str )
{
if ( str == "solid" ) return Qt::SolidPattern;
if ( str == "horizontal" ) return Qt::HorPattern;
if ( str == "vertical" ) return Qt::VerPattern;
if ( str == "cross" ) return Qt::CrossPattern;
if ( str == "b_diagonal" ) return Qt::BDiagPattern;
if ( str == "f_diagonal" ) return Qt::FDiagPattern;
if ( str == "diagonal_x" ) return Qt::DiagCrossPattern;
if ( str == "dense1" ) return Qt::Dense1Pattern;
if ( str == "dense2" ) return Qt::Dense2Pattern;
if ( str == "dense3" ) return Qt::Dense3Pattern;
if ( str == "dense4" ) return Qt::Dense4Pattern;
if ( str == "dense5" ) return Qt::Dense5Pattern;
if ( str == "dense6" ) return Qt::Dense6Pattern;
if ( str == "dense7" ) return Qt::Dense7Pattern;
if ( str == "no" ) return Qt::NoBrush;
return Qt::SolidPattern;
}
QString QgsSymbolLayerV2Utils::encodeSldBrushStyle( Qt::BrushStyle style )
{
switch ( style )
{
case Qt::CrossPattern:
return "cross";
case Qt::DiagCrossPattern:
return "x";
/* The following names are taken from the presentation "GeoServer
* Cartographic Rendering" by Andrea Aime at the FOSS4G 2010.
* (see http://2010.foss4g.org/presentations/3588.pdf)
*/
case Qt::HorPattern:
return "horline";
case Qt::VerPattern:
return "line";
case Qt::BDiagPattern:
return "slash";
case Qt::FDiagPattern:
return "backslash";
/* define the other names following the same pattern used above */
case Qt::Dense1Pattern:
case Qt::Dense2Pattern:
case Qt::Dense3Pattern:
case Qt::Dense4Pattern:
case Qt::Dense5Pattern:
case Qt::Dense6Pattern:
case Qt::Dense7Pattern:
return QString( "brush://%1" ).arg( encodeBrushStyle( style ) );
default:
return QString();
}
}
Qt::BrushStyle QgsSymbolLayerV2Utils::decodeSldBrushStyle( const QString& str )
{
if ( str == "horline" ) return Qt::HorPattern;
if ( str == "line" ) return Qt::VerPattern;
if ( str == "cross" ) return Qt::CrossPattern;
if ( str == "slash" ) return Qt::BDiagPattern;
if ( str == "backshash" ) return Qt::FDiagPattern;
if ( str == "x" ) return Qt::DiagCrossPattern;
if ( str.startsWith( "brush://" ) )
return decodeBrushStyle( str.mid( 8 ) );
return Qt::NoBrush;
}
QString QgsSymbolLayerV2Utils::encodePoint( QPointF point )
{
return QString( "%1,%2" ).arg( point.x() ).arg( point.y() );
}
QPointF QgsSymbolLayerV2Utils::decodePoint( const QString& str )
{
QStringList lst = str.split( ',' );
if ( lst.count() != 2 )
return QPointF( 0, 0 );
return QPointF( lst[0].toDouble(), lst[1].toDouble() );
}
QString QgsSymbolLayerV2Utils::encodeMapUnitScale( const QgsMapUnitScale& mapUnitScale )
{
return QString( "%1,%2,%3,%4,%5,%6" ).arg( mapUnitScale.minScale ).arg( mapUnitScale.maxScale )
.arg( mapUnitScale.minSizeMMEnabled ? 1 : 0 )
.arg( mapUnitScale.minSizeMM )
.arg( mapUnitScale.maxSizeMMEnabled ? 1 : 0 )
.arg( mapUnitScale.maxSizeMM );
}
QgsMapUnitScale QgsSymbolLayerV2Utils::decodeMapUnitScale( const QString& str )
{
QStringList lst = str.split( ',' );
if ( lst.count() < 2 )
return QgsMapUnitScale();
if ( lst.count() < 6 )
{
// old format
return QgsMapUnitScale( lst[0].toDouble(), lst[1].toDouble() );
}
QgsMapUnitScale s( lst[0].toDouble(), lst[1].toDouble() );
s.minSizeMMEnabled = lst[2].toInt();
s.minSizeMM = lst[3].toDouble();
s.maxSizeMMEnabled = lst[4].toInt();
s.maxSizeMM = lst[5].toDouble();
return s;
}
QString QgsSymbolLayerV2Utils::encodeOutputUnit( QgsSymbolV2::OutputUnit unit )
{
switch ( unit )
{
case QgsSymbolV2::MM:
return "MM";
case QgsSymbolV2::MapUnit:
return "MapUnit";
case QgsSymbolV2::Pixel:
return "Pixel";
case QgsSymbolV2::Percentage:
return "Percentage";
default:
return "MM";
}
}
QgsSymbolV2::OutputUnit QgsSymbolLayerV2Utils::decodeOutputUnit( const QString& string )
{
QString normalized = string.trimmed().toLower();
if ( normalized == encodeOutputUnit( QgsSymbolV2::MM ).toLower() )
return QgsSymbolV2::MM;
if ( normalized == encodeOutputUnit( QgsSymbolV2::MapUnit ).toLower() )
return QgsSymbolV2::MapUnit;
if ( normalized == encodeOutputUnit( QgsSymbolV2::Pixel ).toLower() )
return QgsSymbolV2::Pixel;
if ( normalized == encodeOutputUnit( QgsSymbolV2::Percentage ).toLower() )
return QgsSymbolV2::Percentage;
// millimeters are default
return QgsSymbolV2::MM;
}
QString QgsSymbolLayerV2Utils::encodeSldUom( QgsSymbolV2::OutputUnit unit, double *scaleFactor )
{
switch ( unit )
{
case QgsSymbolV2::MapUnit:
if ( scaleFactor )
*scaleFactor = 0.001; // from millimeters to meters
return "http://www.opengeospatial.org/se/units/metre";
case QgsSymbolV2::MM:
default:
// pixel is the SLD default uom. The "standardized rendering pixel
// size" is defined to be 0.28mm × 0.28mm (millimeters).
if ( scaleFactor )
*scaleFactor = 1 / 0.28; // from millimeters to pixels
// http://www.opengeospatial.org/sld/units/pixel
return QString();
}
}
QgsSymbolV2::OutputUnit QgsSymbolLayerV2Utils::decodeSldUom( const QString& str, double *scaleFactor )
{
if ( str == "http://www.opengeospatial.org/se/units/metre" )
{
if ( scaleFactor )
*scaleFactor = 1000.0; // from meters to millimeters
return QgsSymbolV2::MapUnit;
}
else if ( str == "http://www.opengeospatial.org/se/units/foot" )
{
if ( scaleFactor )
*scaleFactor = 304.8; // from feet to meters
return QgsSymbolV2::MapUnit;
}
// pixel is the SLD default uom. The "standardized rendering pixel
// size" is defined to be 0.28mm x 0.28mm (millimeters).
if ( scaleFactor )
*scaleFactor = 1 / 0.00028; // from pixels to millimeters
return QgsSymbolV2::MM;
}
QString QgsSymbolLayerV2Utils::encodeRealVector( const QVector<qreal>& v )
{
QString vectorString;
QVector<qreal>::const_iterator it = v.constBegin();
for ( ; it != v.constEnd(); ++it )
{
if ( it != v.constBegin() )
{
vectorString.append( ';' );
}
vectorString.append( QString::number( *it ) );
}
return vectorString;
}
QVector<qreal> QgsSymbolLayerV2Utils::decodeRealVector( const QString& s )
{
QVector<qreal> resultVector;
QStringList realList = s.split( ';' );
QStringList::const_iterator it = realList.constBegin();
for ( ; it != realList.constEnd(); ++it )
{
resultVector.append( it->toDouble() );
}
return resultVector;
}
QString QgsSymbolLayerV2Utils::encodeSldRealVector( const QVector<qreal>& v )
{
QString vectorString;
QVector<qreal>::const_iterator it = v.constBegin();
for ( ; it != v.constEnd(); ++it )
{
if ( it != v.constBegin() )
{
vectorString.append( ' ' );
}
vectorString.append( QString::number( *it ) );
}
return vectorString;
}
QVector<qreal> QgsSymbolLayerV2Utils::decodeSldRealVector( const QString& s )
{
QVector<qreal> resultVector;
QStringList realList = s.split( ' ' );
QStringList::const_iterator it = realList.constBegin();
for ( ; it != realList.constEnd(); ++it )
{
resultVector.append( it->toDouble() );
}
return resultVector;
}
QString QgsSymbolLayerV2Utils::encodeScaleMethod( QgsSymbolV2::ScaleMethod scaleMethod )
{
QString encodedValue;
switch ( scaleMethod )
{
case QgsSymbolV2::ScaleDiameter:
encodedValue = "diameter";
break;
case QgsSymbolV2::ScaleArea:
encodedValue = "area";
break;
}
return encodedValue;
}
QgsSymbolV2::ScaleMethod QgsSymbolLayerV2Utils::decodeScaleMethod( const QString& str )
{
QgsSymbolV2::ScaleMethod scaleMethod;
if ( str == "diameter" )
{
scaleMethod = QgsSymbolV2::ScaleDiameter;
}
else
{
scaleMethod = QgsSymbolV2::ScaleArea;
}
return scaleMethod;
}
QPainter::CompositionMode QgsSymbolLayerV2Utils::decodeBlendMode( const QString &s )
{
if ( s.compare( "Lighten", Qt::CaseInsensitive ) == 0 ) return QPainter::CompositionMode_Lighten;
if ( s.compare( "Screen", Qt::CaseInsensitive ) == 0 ) return QPainter::CompositionMode_Screen;
if ( s.compare( "Dodge", Qt::CaseInsensitive ) == 0 ) return QPainter::CompositionMode_ColorDodge;
if ( s.compare( "Addition", Qt::CaseInsensitive ) == 0 ) return QPainter::CompositionMode_Plus;
if ( s.compare( "Darken", Qt::CaseInsensitive ) == 0 ) return QPainter::CompositionMode_Darken;
if ( s.compare( "Multiply", Qt::CaseInsensitive ) == 0 ) return QPainter::CompositionMode_Multiply;
if ( s.compare( "Burn", Qt::CaseInsensitive ) == 0 ) return QPainter::CompositionMode_ColorBurn;
if ( s.compare( "Overlay", Qt::CaseInsensitive ) == 0 ) return QPainter::CompositionMode_Overlay;
if ( s.compare( "SoftLight", Qt::CaseInsensitive ) == 0 ) return QPainter::CompositionMode_SoftLight;
if ( s.compare( "HardLight", Qt::CaseInsensitive ) == 0 ) return QPainter::CompositionMode_HardLight;
if ( s.compare( "Difference", Qt::CaseInsensitive ) == 0 ) return QPainter::CompositionMode_Difference;
if ( s.compare( "Subtract", Qt::CaseInsensitive ) == 0 ) return QPainter::CompositionMode_Exclusion;
return QPainter::CompositionMode_SourceOver; // "Normal"
}
QIcon QgsSymbolLayerV2Utils::symbolPreviewIcon( QgsSymbolV2* symbol, QSize size )
{
return QIcon( symbolPreviewPixmap( symbol, size ) );
}
QPixmap QgsSymbolLayerV2Utils::symbolPreviewPixmap( QgsSymbolV2* symbol, QSize size, QgsRenderContext* customContext )
{
Q_ASSERT( symbol );
QPixmap pixmap( size );
pixmap.fill( Qt::transparent );
QPainter painter;
painter.begin( &pixmap );
painter.setRenderHint( QPainter::Antialiasing );
if ( customContext )
customContext->setPainter( &painter );
symbol->drawPreviewIcon( &painter, size, customContext );
painter.end();
return pixmap;
}
double QgsSymbolLayerV2Utils::estimateMaxSymbolBleed( QgsSymbolV2* symbol )
{
double maxBleed = 0;
for ( int i = 0; i < symbol->symbolLayerCount(); i++ )
{
QgsSymbolLayerV2* layer = symbol->symbolLayer( i );
double layerMaxBleed = layer->estimateMaxBleed();
maxBleed = layerMaxBleed > maxBleed ? layerMaxBleed : maxBleed;
}
return maxBleed;
}
QPicture QgsSymbolLayerV2Utils::symbolLayerPreviewPicture( QgsSymbolLayerV2* layer, QgsSymbolV2::OutputUnit units, QSize size, const QgsMapUnitScale& scale )
{
QPicture picture;
QPainter painter;
painter.begin( &picture );
painter.setRenderHint( QPainter::Antialiasing );
QgsRenderContext renderContext = createRenderContext( &painter );
renderContext.setForceVectorOutput( true );
QgsSymbolV2RenderContext symbolContext( renderContext, units, 1.0, false, 0, nullptr, nullptr, scale );
layer->drawPreviewIcon( symbolContext, size );
painter.end();
return picture;
}
QIcon QgsSymbolLayerV2Utils::symbolLayerPreviewIcon( QgsSymbolLayerV2* layer, QgsSymbolV2::OutputUnit u, QSize size, const QgsMapUnitScale& scale )
{
QPixmap pixmap( size );
pixmap.fill( Qt::transparent );
QPainter painter;
painter.begin( &pixmap );
painter.setRenderHint( QPainter::Antialiasing );
QgsRenderContext renderContext = createRenderContext( &painter );
QgsSymbolV2RenderContext symbolContext( renderContext, u, 1.0, false, 0, nullptr, nullptr, scale );
layer->drawPreviewIcon( symbolContext, size );
painter.end();
return QIcon( pixmap );
}
QIcon QgsSymbolLayerV2Utils::colorRampPreviewIcon( QgsVectorColorRampV2* ramp, QSize size )
{
return QIcon( colorRampPreviewPixmap( ramp, size ) );
}
QPixmap QgsSymbolLayerV2Utils::colorRampPreviewPixmap( QgsVectorColorRampV2* ramp, QSize size )
{
QPixmap pixmap( size );
pixmap.fill( Qt::transparent );
// pixmap.fill( Qt::white ); // this makes the background white instead of transparent
QPainter painter;
painter.begin( &pixmap );
//draw stippled background, for transparent images
drawStippledBackground( &painter, QRect( 0, 0, size.width(), size.height() ) );
// antialising makes the colors duller, and no point in antialiasing a color ramp
// painter.setRenderHint( QPainter::Antialiasing );
for ( int i = 0; i < size.width(); i++ )
{
QPen pen( ramp->color( static_cast< double >( i ) / size.width() ) );
painter.setPen( pen );
painter.drawLine( i, 0, i, size.height() - 1 );
}
painter.end();
return pixmap;
}
void QgsSymbolLayerV2Utils::drawStippledBackground( QPainter* painter, QRect rect )
{
// create a 2x2 checker-board image
uchar pixDataRGB[] = { 255, 255, 255, 255,
127, 127, 127, 255,
127, 127, 127, 255,
255, 255, 255, 255
};
QImage img( pixDataRGB, 2, 2, 8, QImage::Format_ARGB32 );
// scale it to rect so at least 5 patterns are shown
int width = ( rect.width() < rect.height() ) ?
rect.width() / 2.5 : rect.height() / 2.5;
QPixmap pix = QPixmap::fromImage( img.scaled( width, width ) );
// fill rect with texture
QBrush brush;
brush.setTexture( pix );
painter->fillRect( rect, brush );
}
#include <QPolygonF>
#include <cmath>
#include <cfloat>
#if !defined(GEOS_VERSION_MAJOR) || !defined(GEOS_VERSION_MINOR) || \
((GEOS_VERSION_MAJOR<3) || ((GEOS_VERSION_MAJOR==3) && (GEOS_VERSION_MINOR<3)))
// calculate line's angle and tangent
static bool lineInfo( QPointF p1, QPointF p2, double& angle, double& t )
{
double x1 = p1.x(), y1 = p1.y(), x2 = p2.x(), y2 = p2.y();
if ( x1 == x2 && y1 == y2 )
return false;
// tangent
t = ( x1 == x2 ? DBL_MAX : ( y2 - y1 ) / ( x2 - x1 ) );
// angle
if ( t == DBL_MAX )
angle = ( y2 > y1 ? M_PI / 2 : M_PI * 3 / 2 ); // angle is 90 or 270
else if ( t == 0 )
angle = ( x2 > x1 ? 0 : M_PI ); // angle is 0 or 180
else if ( t >= 0 )
angle = ( y2 > y1 ? atan( t ) : M_PI + atan( t ) );
else // t < 0
angle = ( y2 > y1 ? M_PI + atan( t ) : atan( t ) );
return true;
}
// offset a point with an angle and distance
static QPointF offsetPoint( QPointF pt, double angle, double dist )
{
return QPointF( pt.x() + dist * cos( angle ), pt.y() + dist * sin( angle ) );
}
// calc intersection of two (infinite) lines defined by one point and tangent
static QPointF linesIntersection( QPointF p1, double t1, QPointF p2, double t2 )
{
// parallel lines? (or the difference between angles is less than appr. 10 degree)
if (( t1 == DBL_MAX && t2 == DBL_MAX ) || qAbs( atan( t1 ) - atan( t2 ) ) < 0.175 )
return QPointF();
double x, y;
if ( t1 == DBL_MAX || t2 == DBL_MAX )
{
// in case one line is with angle 90 resp. 270 degrees (tangent undefined)
// swap them so that line 2 is with undefined tangent
if ( t1 == DBL_MAX )
{
QPointF pSwp = p1;
p1 = p2;
p2 = pSwp;
double tSwp = t1;
t1 = t2;
t2 = tSwp;
}
x = p2.x();
}
else
{
// usual case
x = (( p1.y() - p2.y() ) + t2 * p2.x() - t1 * p1.x() ) / ( t2 - t1 );
}
y = p1.y() + t1 * ( x - p1.x() );
return QPointF( x, y );
}
#else
static QPolygonF makeOffsetGeometry( const QgsPolyline& polyline )
{
int i, pointCount = polyline.count();
QPolygonF resultLine;
resultLine.resize( pointCount );
const QgsPoint* tempPtr = polyline.data();
for ( i = 0; i < pointCount; ++i, tempPtr++ )
resultLine[i] = QPointF( tempPtr->x(), tempPtr->y() );
return resultLine;
}
static QList<QPolygonF> makeOffsetGeometry( const QgsPolygon& polygon )
{
QList<QPolygonF> resultGeom;
resultGeom.reserve( polygon.size() );
for ( int ring = 0; ring < polygon.size(); ++ring )
resultGeom.append( makeOffsetGeometry( polygon[ ring ] ) );
return resultGeom;
}
#endif
QList<QPolygonF> offsetLine( QPolygonF polyline, double dist, QGis::GeometryType geometryType )
{
QList<QPolygonF> resultLine;
if ( polyline.count() < 2 )
{
resultLine.append( polyline );
return resultLine;
}
QPolygonF newLine;
// need at least geos 3.3 for OffsetCurve tool
#if defined(GEOS_VERSION_MAJOR) && defined(GEOS_VERSION_MINOR) && \
((GEOS_VERSION_MAJOR>3) || ((GEOS_VERSION_MAJOR==3) && (GEOS_VERSION_MINOR>=3)))
unsigned int i, pointCount = polyline.count();
QgsPolyline tempPolyline( pointCount );
QPointF* tempPtr = polyline.data();
for ( i = 0; i < pointCount; ++i, tempPtr++ )
tempPolyline[i] = QgsPoint( tempPtr->rx(), tempPtr->ry() );
QgsGeometry* tempGeometry = geometryType == QGis::Polygon ? QgsGeometry::fromPolygon( QgsPolygon() << tempPolyline ) : QgsGeometry::fromPolyline( tempPolyline );
if ( tempGeometry )
{
int quadSegments = 0; // we want mitre joins, not round joins
double mitreLimit = 2.0; // the default value in GEOS (5.0) allows for fairly sharp endings
QgsGeometry* offsetGeom = nullptr;
if ( geometryType == QGis::Polygon )
offsetGeom = tempGeometry->buffer( -dist, quadSegments, GEOSBUF_CAP_FLAT, GEOSBUF_JOIN_MITRE, mitreLimit );
else
offsetGeom = tempGeometry->offsetCurve( dist, quadSegments, GEOSBUF_JOIN_MITRE, mitreLimit );
if ( offsetGeom )
{
delete tempGeometry;
tempGeometry = offsetGeom;
if ( QGis::flatType( tempGeometry->wkbType() ) == QGis::WKBLineString )
{
QgsPolyline line = tempGeometry->asPolyline();
// Reverse the line if offset was negative, see
// http://hub.qgis.org/issues/13811
if ( dist < 0 ) std::reverse( line.begin(), line.end() );
resultLine.append( makeOffsetGeometry( line ) );
delete tempGeometry;
return resultLine;
}
else if ( QGis::flatType( tempGeometry->wkbType() ) == QGis::WKBPolygon )
{
resultLine.append( makeOffsetGeometry( tempGeometry->asPolygon() ) );
delete tempGeometry;
return resultLine;
}
else if ( QGis::flatType( tempGeometry->wkbType() ) == QGis::WKBMultiLineString )
{
QgsMultiPolyline tempMPolyline = tempGeometry->asMultiPolyline();
resultLine.reserve( tempMPolyline.count() );
for ( int part = 0; part < tempMPolyline.count(); ++part )
{
resultLine.append( makeOffsetGeometry( tempMPolyline[ part ] ) );
}
delete tempGeometry;
return resultLine;
}
else if ( QGis::flatType( tempGeometry->wkbType() ) == QGis::WKBMultiPolygon )
{
QgsMultiPolygon tempMPolygon = tempGeometry->asMultiPolygon();
resultLine.reserve( tempMPolygon.count() );
for ( int part = 0; part < tempMPolygon.count(); ++part )
{
resultLine.append( makeOffsetGeometry( tempMPolygon[ part ] ) );
}
delete tempGeometry;
return resultLine;
}
}
delete tempGeometry;
}
// returns original polyline when 'GEOSOffsetCurve' fails!
resultLine.append( polyline );
return resultLine;
#else
double angle = 0.0, t_new, t_old = 0;
QPointF pt_old, pt_new;
QPointF p1 = polyline[0], p2;
bool first_point = true;
for ( int i = 1; i < polyline.count(); i++ )
{
p2 = polyline[i];
if ( !lineInfo( p1, p2, angle, t_new ) )
continue; // not a line...
pt_new = offsetPoint( p1, angle + M_PI / 2, dist );
if ( ! first_point )
{
// if it's not the first line segment
// calc intersection with last line (with offset)
QPointF pt_tmp = linesIntersection( pt_old, t_old, pt_new, t_new );
if ( !pt_tmp.isNull() )
pt_new = pt_tmp;
}
newLine.append( pt_new );
pt_old = pt_new;
t_old = t_new;
p1 = p2;
first_point = false;
}
// last line segment:
pt_new = offsetPoint( p2, angle + M_PI / 2, dist );
newLine.append( pt_new );
resultLine.append( newLine );
return resultLine;
#endif
}
QList<QPolygonF> offsetLine( const QPolygonF& polyline, double dist )
{
QGis::GeometryType geometryType = QGis::Point;
int pointCount = polyline.count();
if ( pointCount > 3 && qgsDoubleNear( polyline[ 0 ].x(), polyline[ pointCount - 1 ].x() ) && qgsDoubleNear( polyline[ 0 ].y(), polyline[ pointCount - 1 ].y() ) )
{
geometryType = QGis::Polygon;
}
else if ( pointCount > 1 )
{
geometryType = QGis::Line;
}
return offsetLine( polyline, dist, geometryType );
}
/////
QgsSymbolV2* QgsSymbolLayerV2Utils::loadSymbol( const QDomElement &element )
{
QgsSymbolLayerV2List layers;
QDomNode layerNode = element.firstChild();
while ( !layerNode.isNull() )
{
QDomElement e = layerNode.toElement();
if ( !e.isNull() )
{
if ( e.tagName() != "layer" )
{
QgsDebugMsg( "unknown tag " + e.tagName() );
}
else
{
QgsSymbolLayerV2* layer = loadSymbolLayer( e );
if ( layer )
{
// Dealing with sub-symbols nested into a layer
QDomElement s = e.firstChildElement( "symbol" );
if ( !s.isNull() )
{
QgsSymbolV2* subSymbol = loadSymbol( s );
bool res = layer->setSubSymbol( subSymbol );
if ( !res )
{
QgsDebugMsg( "symbol layer refused subsymbol: " + s.attribute( "name" ) );
}
}
layers.append( layer );
}
}
}
layerNode = layerNode.nextSibling();
}
if ( layers.isEmpty() )
{
QgsDebugMsg( "no layers for symbol" );
return nullptr;
}
QString symbolType = element.attribute( "type" );
QgsSymbolV2* symbol = nullptr;
if ( symbolType == "line" )
symbol = new QgsLineSymbolV2( layers );
else if ( symbolType == "fill" )
symbol = new QgsFillSymbolV2( layers );
else if ( symbolType == "marker" )
symbol = new QgsMarkerSymbolV2( layers );
else
{
QgsDebugMsg( "unknown symbol type " + symbolType );