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 <Qt>
#include <QtCore>
#include <QFont>
#include <QColor>
#include <QPainter>
#include "qgssymbol.h"
#include "qgis.h"
#include "qgsmapunitscale.h"
#include "qgscolorramp.h"
#include "qgsarrowsymbollayer.h"

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 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 QString encodeSize( QSizeF size );

    static QSizeF decodeSize( const QString &string );

    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 );

    static double sizeInPixelsFromSldUom( const QString &uom, double size );

    static QString encodeScaleMethod( QgsSymbol::ScaleMethod scaleMethod );
    static QgsSymbol::ScaleMethod decodeScaleMethod( const QString &str );

    static QPainter::CompositionMode decodeBlendMode( const QString &s );

    static QIcon symbolPreviewIcon( QgsSymbol *symbol, QSize size, int padding = 0 );

    static QPixmap symbolPreviewPixmap( QgsSymbol *symbol, QSize size, int padding = 0, QgsRenderContext *customContext = nullptr );

    static QPicture symbolLayerPreviewPicture( QgsSymbolLayer *layer, QgsUnitTypes::RenderUnit units, QSize size, const QgsMapUnitScale &scale = QgsMapUnitScale() );

    static QIcon symbolLayerPreviewIcon( 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 );

    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, QgsSymbol *symbol, QDomDocument &doc, const QgsReadWriteContext &context );

    static QString symbolProperties( QgsSymbol *symbol );

    static bool createSymbolLayerListFromSld( QDomElement &element, QgsWkbTypes::GeometryType geomType, QgsSymbolLayerList &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, QgsSymbolLayerList &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 QgsStringMap parseProperties( QDomElement &element );
    static void saveProperties( QgsStringMap 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( 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 );

    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 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, QList<QPolygonF> *rings = nullptr );

    static bool pointInPolygon( const QPolygonF &points, QPointF point );

    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 QgsStringMap &props );

    static QPointF rescaleUom( QPointF point, QgsUnitTypes::RenderUnit unit, const QgsStringMap &props ) SIP_PYNAME( rescalePointUom );

    static QVector<qreal> rescaleUom( const QVector<qreal> &array, QgsUnitTypes::RenderUnit unit, const QgsStringMap &props ) SIP_PYNAME( rescaleArrayUom );

    static void applyScaleDependency( QDomDocument &doc, QDomElement &ruleElem, QgsStringMap &props );

    static void mergeScaleDependencies( double mScaleMinDenom, double mScaleMaxDenom, QgsStringMap &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 );

};

class QPolygonF;

QList<QPolygonF> offsetLine( QPolygonF polyline, double dist, QgsWkbTypes::GeometryType geometryType ) SIP_SKIP;

#endif