qgssymbollayerutils.h

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/***************************************************************************
 qgssymbollayerutils.h
 ---------------------
 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.                                   *
 *                                                                         *
 ***************************************************************************/
 
 
#ifndef QGSSYMBOLLAYERUTILS_H
#define QGSSYMBOLLAYERUTILS_H
 
#include "qgis_core.h"
#include "qgis_sip.h"
#include <QMap>
#include <QFont>
#include <QColor>
#include <QPainter>
#include "qgis.h"
#include "qgsmapunitscale.h"
#include "qgscolorramp.h"
#include "qgsarrowsymbollayer.h"
#include "qgssymbol.h"
 
#include <QFile>
 
class QgsExpression;
class QgsPathResolver;
class QgsReadWriteContext;
class QgsSymbolLayer;
 
typedef QMap<QString, QString> QgsStringMap;
typedef QMap<QString, QgsSymbol * > QgsSymbolMap;
typedef QList< QPair< QColor, QString > > QgsNamedColorList SIP_SKIP;
 
class QDomDocument;
class QDomElement;
class QIcon;
class QPixmap;
class QPointF;
class QSize;
class QMimeData;
class QgsFeatureRenderer;
class QgsSymbolLayerId;
 
class CORE_EXPORT QgsSymbolLayerUtils
{
  public:
 
    enum VertexMarkerType
    {
      SemiTransparentCircle,
      Cross,
      NoMarker
    };
 
    static QString encodeColor( const QColor &color );
    static QColor decodeColor( const QString &str );
 
    static QString encodeSldAlpha( int alpha );
    static int decodeSldAlpha( const QString &str );
 
    static QString encodeSldFontStyle( QFont::Style style );
    static QFont::Style decodeSldFontStyle( const QString &str );
 
    static QString encodeSldFontWeight( int weight );
    static int decodeSldFontWeight( const QString &str );
 
    static QString encodePenStyle( Qt::PenStyle style );
    static Qt::PenStyle decodePenStyle( const QString &str );
 
    static QString encodePenJoinStyle( Qt::PenJoinStyle style );
    static Qt::PenJoinStyle decodePenJoinStyle( const QString &str );
 
    static QString encodePenCapStyle( Qt::PenCapStyle style );
    static Qt::PenCapStyle decodePenCapStyle( const QString &str );
 
    static QString encodeSldLineJoinStyle( Qt::PenJoinStyle style );
    static Qt::PenJoinStyle decodeSldLineJoinStyle( const QString &str );
 
    static QString encodeSldLineCapStyle( Qt::PenCapStyle style );
    static Qt::PenCapStyle decodeSldLineCapStyle( const QString &str );
 
    static QString encodeBrushStyle( Qt::BrushStyle style );
    static Qt::BrushStyle decodeBrushStyle( const QString &str );
 
    static QString encodeSldBrushStyle( Qt::BrushStyle style );
    static Qt::BrushStyle decodeSldBrushStyle( const QString &str );
 
    static QgsArrowSymbolLayer::HeadType decodeArrowHeadType( const QVariant &value, bool *ok SIP_OUT = nullptr );
 
    static QgsArrowSymbolLayer::ArrowType decodeArrowType( const QVariant &value, bool *ok SIP_OUT = nullptr );
 
    static QString encodePoint( QPointF point );
 
    static QPointF decodePoint( const QString &string );
 
    static QPointF toPoint( const QVariant &value, bool *ok SIP_OUT = nullptr );
 
    static QString encodeSize( QSizeF size );
 
    static QSizeF decodeSize( const QString &string );
 
    static QSizeF toSize( const QVariant &value, bool *ok SIP_OUT = nullptr );
 
    static QString encodeMapUnitScale( const QgsMapUnitScale &mapUnitScale );
    static QgsMapUnitScale decodeMapUnitScale( const QString &str );
 
    static QString encodeRealVector( const QVector<qreal> &v );
    static QVector<qreal> decodeRealVector( const QString &s );
 
    static QString encodeSldRealVector( const QVector<qreal> &v );
    static QVector<qreal> decodeSldRealVector( const QString &s );
 
    static QString encodeSldUom( QgsUnitTypes::RenderUnit unit, double *scaleFactor );
 
    static QgsUnitTypes::RenderUnit decodeSldUom( const QString &str, double *scaleFactor = nullptr );
 
    static double sizeInPixelsFromSldUom( const QString &uom, double size );
 
    static QString encodeScaleMethod( Qgis::ScaleMethod scaleMethod );
 
    static Qgis::ScaleMethod decodeScaleMethod( const QString &str );
 
    static QPainter::CompositionMode decodeBlendMode( const QString &s );
 
    static QIcon symbolPreviewIcon( const QgsSymbol *symbol, QSize size, int padding = 0, QgsLegendPatchShape *shape = nullptr );
 
    static QPixmap symbolPreviewPixmap( const QgsSymbol *symbol, QSize size, int padding = 0, QgsRenderContext *customContext = nullptr, bool selected = false,
                                        const QgsExpressionContext *expressionContext = nullptr,
                                        const QgsLegendPatchShape *shape = nullptr );
 
    static QPicture symbolLayerPreviewPicture( const QgsSymbolLayer *layer, QgsUnitTypes::RenderUnit units, QSize size, const QgsMapUnitScale &scale = QgsMapUnitScale() );
 
    static QIcon symbolLayerPreviewIcon( const QgsSymbolLayer *layer, QgsUnitTypes::RenderUnit u, QSize size, const QgsMapUnitScale &scale = QgsMapUnitScale() );
 
    static QIcon colorRampPreviewIcon( QgsColorRamp *ramp, QSize size, int padding = 0 );
 
    static QPixmap colorRampPreviewPixmap( QgsColorRamp *ramp, QSize size, int padding = 0, Qt::Orientation direction = Qt::Horizontal,
                                           bool flipDirection = false, bool drawTransparentBackground = true );
 
    static void drawStippledBackground( QPainter *painter, QRect rect );
 
    static void drawVertexMarker( double x, double y, QPainter &p, QgsSymbolLayerUtils::VertexMarkerType type, int markerSize );
 
    static double estimateMaxSymbolBleed( QgsSymbol *symbol, const QgsRenderContext &context );
 
    static QgsSymbol *loadSymbol( const QDomElement &element, const QgsReadWriteContext &context ) SIP_FACTORY;
 
    template <class SymbolType> static SymbolType *loadSymbol( const QDomElement &element, const QgsReadWriteContext &context ) SIP_SKIP
    {
      QgsSymbol *tmpSymbol = QgsSymbolLayerUtils::loadSymbol( element, context );
      SymbolType *symbolCastToType = dynamic_cast<SymbolType *>( tmpSymbol );
 
      if ( symbolCastToType )
      {
        return symbolCastToType;
      }
      else
      {
        //could not cast
        delete tmpSymbol;
        return nullptr;
      }
    }
 
    static QgsSymbolLayer *loadSymbolLayer( QDomElement &element, const QgsReadWriteContext &context ) SIP_FACTORY;
    static QDomElement saveSymbol( const QString &symbolName, const QgsSymbol *symbol, QDomDocument &doc, const QgsReadWriteContext &context );
 
    static QString symbolProperties( QgsSymbol *symbol );
 
    static bool createSymbolLayerListFromSld( QDomElement &element, QgsWkbTypes::GeometryType geomType, QList<QgsSymbolLayer *> &layers );
 
    static QgsSymbolLayer *createFillLayerFromSld( QDomElement &element ) SIP_FACTORY;
    static QgsSymbolLayer *createLineLayerFromSld( QDomElement &element ) SIP_FACTORY;
    static QgsSymbolLayer *createMarkerLayerFromSld( QDomElement &element ) SIP_FACTORY;
 
    static bool convertPolygonSymbolizerToPointMarker( QDomElement &element, QList<QgsSymbolLayer *> &layerList );
    static bool hasExternalGraphic( QDomElement &element );
    static bool hasWellKnownMark( QDomElement &element );
 
    static bool needFontMarker( QDomElement &element );
    static bool needSvgMarker( QDomElement &element );
    static bool needEllipseMarker( QDomElement &element );
    static bool needMarkerLine( QDomElement &element );
    static bool needLinePatternFill( QDomElement &element );
    static bool needPointPatternFill( QDomElement &element );
    static bool needSvgFill( QDomElement &element );
 
    static void fillToSld( QDomDocument &doc, QDomElement &element,
                           Qt::BrushStyle brushStyle, const QColor &color = QColor() );
    static bool fillFromSld( QDomElement &element,
                             Qt::BrushStyle &brushStyle, QColor &color );
 
    static void lineToSld( QDomDocument &doc, QDomElement &element,
                           Qt::PenStyle penStyle, const QColor &color, double width = -1,
                           const Qt::PenJoinStyle *penJoinStyle = nullptr, const Qt::PenCapStyle *penCapStyle = nullptr,
                           const QVector<qreal> *customDashPattern = nullptr, double dashOffset = 0.0 ) SIP_SKIP;
    static bool lineFromSld( QDomElement &element,
                             Qt::PenStyle &penStyle, QColor &color, double &width,
                             Qt::PenJoinStyle *penJoinStyle = nullptr, Qt::PenCapStyle *penCapStyle = nullptr,
                             QVector<qreal> *customDashPattern = nullptr, double *dashOffset = nullptr );
 
    static void externalGraphicToSld( QDomDocument &doc, QDomElement &element,
                                      const QString &path, const QString &mime,
                                      const QColor &color, double size = -1 );
    static bool externalGraphicFromSld( QDomElement &element,
                                        QString &path, QString &mime,
                                        QColor &color, double &size );
 
    static void wellKnownMarkerToSld( QDomDocument &doc, QDomElement &element,
                                      const QString &name, const QColor &color, const QColor &strokeColor, Qt::PenStyle strokeStyle,
                                      double strokeWidth = -1, double size = -1 );
 
    static bool wellKnownMarkerFromSld( QDomElement &element,
                                        QString &name, QColor &color, QColor &strokeColor, Qt::PenStyle &strokeStyle,
                                        double &strokeWidth, double &size ) SIP_PYNAME( wellKnownMarkerFromSld2 );
 
    static void externalMarkerToSld( QDomDocument &doc, QDomElement &element,
                                     const QString &path, const QString &format, int *markIndex = nullptr,
                                     const QColor &color = QColor(), double size = -1 );
    static bool externalMarkerFromSld( QDomElement &element,
                                       QString &path, QString &format, int &markIndex,
                                       QColor &color, double &size );
 
 
    static void labelTextToSld( QDomDocument &doc, QDomElement &element, const QString &label,
                                const QFont &font, const QColor &color = QColor(), double size = -1 );
 
    static QString ogrFeatureStylePen( double width, double mmScaleFactor, double mapUnitsScaleFactor, const QColor &c,
                                       Qt::PenJoinStyle joinStyle = Qt::MiterJoin,
                                       Qt::PenCapStyle capStyle = Qt::FlatCap,
                                       double offset = 0.0,
                                       const QVector<qreal> *dashPattern = nullptr );
 
    static QString ogrFeatureStyleBrush( const QColor &fillColr );
 
    static void createRotationElement( QDomDocument &doc, QDomElement &element, const QString &rotationFunc );
    static bool rotationFromSldElement( QDomElement &element, QString &rotationFunc );
 
    static void createOpacityElement( QDomDocument &doc, QDomElement &element, const QString &alphaFunc );
    static bool opacityFromSldElement( QDomElement &element, QString &alphaFunc );
 
    static void createDisplacementElement( QDomDocument &doc, QDomElement &element, QPointF offset );
    static bool displacementFromSldElement( QDomElement &element, QPointF &offset );
 
    static void createAnchorPointElement( QDomDocument &doc, QDomElement &element, QPointF anchor );
 
    static void createOnlineResourceElement( QDomDocument &doc, QDomElement &element, const QString &path, const QString &format );
    static bool onlineResourceFromSldElement( QDomElement &element, QString &path, QString &format );
 
    static void createGeometryElement( QDomDocument &doc, QDomElement &element, const QString &geomFunc );
    static bool geometryFromSldElement( QDomElement &element, QString &geomFunc );
 
    static bool createExpressionElement( QDomDocument &doc, QDomElement &element, const QString &function );
    static bool createFunctionElement( QDomDocument &doc, QDomElement &element, const QString &function );
    static bool functionFromSldElement( QDomElement &element, QString &function );
 
    static QDomElement createSvgParameterElement( QDomDocument &doc, const QString &name, const QString &value );
    static QgsStringMap getSvgParameterList( QDomElement &element );
 
    static QDomElement createVendorOptionElement( QDomDocument &doc, const QString &name, const QString &value );
    static QgsStringMap getVendorOptionList( QDomElement &element );
 
    static QVariantMap parseProperties( const QDomElement &element );
    static void saveProperties( QVariantMap props, QDomDocument &doc, QDomElement &element );
 
    static QgsSymbolMap loadSymbols( QDomElement &element, const QgsReadWriteContext &context ) SIP_FACTORY;
    static QDomElement saveSymbols( QgsSymbolMap &symbols, const QString &tagName, QDomDocument &doc, const QgsReadWriteContext &context );
 
    static void clearSymbolMap( QgsSymbolMap &symbols );
 
    static QMimeData *symbolToMimeData( const QgsSymbol *symbol ) SIP_FACTORY;
 
    static QgsSymbol *symbolFromMimeData( const QMimeData *data ) SIP_FACTORY;
 
    static QgsColorRamp *loadColorRamp( QDomElement &element ) SIP_FACTORY;
 
    static QDomElement saveColorRamp( const QString &name, QgsColorRamp *ramp, QDomDocument &doc );
 
    static QVariant colorRampToVariant( const QString &name, QgsColorRamp *ramp );
 
    static QgsColorRamp *loadColorRamp( const QVariant &value ) SIP_FACTORY;
 
    static QString colorToName( const QColor &color );
 
    static QList< QColor > parseColorList( const QString &colorStr );
 
    static QMimeData *colorToMimeData( const QColor &color ) SIP_FACTORY;
 
    static QColor colorFromMimeData( const QMimeData *data, bool &hasAlpha SIP_OUT );
 
    static QgsNamedColorList colorListFromMimeData( const QMimeData *data );
 
    static QMimeData *colorListToMimeData( const QgsNamedColorList &colorList, bool allFormats = true ) SIP_FACTORY;
 
    static bool saveColorsToGpl( QFile &file, const QString &paletteName, const QgsNamedColorList &colors );
 
    static QgsNamedColorList importColorsFromGpl( QFile &file, bool &ok, QString &name );
 
    static QColor parseColor( const QString &colorStr, bool strictEval = false );
 
    static QColor parseColorWithAlpha( const QString &colorStr, bool &containsAlpha, bool strictEval = false );
 
    static void multiplyImageOpacity( QImage *image, qreal opacity );
 
    static void blurImageInPlace( QImage &image, QRect rect, int radius, bool alphaOnly );
 
    static void premultiplyColor( QColor &rgb, int alpha );
 
    static bool condenseFillAndOutline( QgsFillSymbolLayer *fill, QgsLineSymbolLayer *outline );
 
    static void sortVariantList( QList<QVariant> &list, Qt::SortOrder order );
    static QPointF pointOnLineWithDistance( QPointF startPoint, QPointF directionPoint, double distance );
 
    static QStringList listSvgFiles();
 
    static QStringList listSvgFilesAt( const QString &directory );
 
    static QString svgSymbolNameToPath( const QString &name, const QgsPathResolver &pathResolver );
 
    static QString svgSymbolPathToName( const QString &path, const QgsPathResolver &pathResolver );
 
    static QPointF polygonCentroid( const QPolygonF &points );
 
    static QPointF polygonPointOnSurface( const QPolygonF &points, const QVector<QPolygonF> *rings = nullptr );
 
    static bool pointInPolygon( const QPolygonF &points, QPointF point );
 
    static double polylineLength( const QPolygonF &polyline );
 
    static QPolygonF polylineSubstring( const QPolygonF &polyline, double startOffset, double endOffset );
 
    static bool isSharpCorner( QPointF p1, QPointF p2, QPointF p3 );
 
    static void appendPolyline( QPolygonF &target, const QPolygonF &line );
 
    static QgsExpression *fieldOrExpressionToExpression( const QString &fieldOrExpression ) SIP_FACTORY;
 
    static QString fieldOrExpressionFromExpression( QgsExpression *expression );
 
    static QList<double> prettyBreaks( double minimum, double maximum, int classes );
 
    static double rescaleUom( double size, QgsUnitTypes::RenderUnit unit, const QVariantMap &props );
 
    static QPointF rescaleUom( QPointF point, QgsUnitTypes::RenderUnit unit, const QVariantMap &props ) SIP_PYNAME( rescalePointUom );
 
    static QVector<qreal> rescaleUom( const QVector<qreal> &array, QgsUnitTypes::RenderUnit unit, const QVariantMap &props ) SIP_PYNAME( rescaleArrayUom );
 
    static void applyScaleDependency( QDomDocument &doc, QDomElement &ruleElem, QVariantMap &props );
 
    static void mergeScaleDependencies( double mScaleMinDenom, double mScaleMaxDenom, QVariantMap &props );
 
    static void parametricSvgToSld( QDomDocument &doc, QDomElement &graphicElem,
                                    const QString &path,
                                    const QColor &fillColor, double size, const QColor &strokeColor, double strokeWidth );
 
    static QString getSvgParametricPath( const QString &basePath, const QColor &fillColor, const QColor &strokeColor, double strokeWidth );
 
    static QSet<const QgsSymbolLayer *> toSymbolLayerPointers( QgsFeatureRenderer *renderer, const QSet<QgsSymbolLayerId> &symbolLayerIds );
 
    static QgsSymbol *restrictedSizeSymbol( const QgsSymbol *s, double minSize, double maxSize, QgsRenderContext *context, double &width, double &height );
 
    static QgsStringMap evaluatePropertiesMap( const QMap<QString, QgsProperty> &propertiesMap, const QgsExpressionContext &context );
 
#ifndef SIP_RUN
    static QgsProperty rotateWholeSymbol( double additionalRotation, const QgsProperty &property )
    {
      QString exprString = property.asExpression();
      return QgsProperty::fromExpression( QString::number( additionalRotation ) + " + (" + exprString + ')' );
    }
 
    static QgsProperty scaleWholeSymbol( double scaleFactor, const QgsProperty &property )
    {
      QString exprString = property.asExpression();
      return QgsProperty::fromExpression( QString::number( scaleFactor ) + "*(" + exprString + ')' );
    }
 
    static QgsProperty scaleWholeSymbol( double scaleFactorX, double scaleFactorY, const QgsProperty &property )
    {
      QString exprString = property.asExpression();
      return QgsProperty::fromExpression(
               ( !qgsDoubleNear( scaleFactorX, 0.0 ) ? "tostring(" + QString::number( scaleFactorX ) + "*(" + exprString + "))" : QStringLiteral( "'0'" ) ) +
               "|| ',' || " +
               ( !qgsDoubleNear( scaleFactorY, 0.0 ) ? "tostring(" + QString::number( scaleFactorY ) + "*(" + exprString + "))" : QStringLiteral( "'0'" ) ) );
    }
#endif
 
};
 
class QPolygonF;
 
QList<QPolygonF> offsetLine( QPolygonF polyline, double dist, QgsWkbTypes::GeometryType geometryType ) SIP_SKIP;
 
#endif