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qgssymbollayerutils.h
859 lines (729 loc) · 36.5 KB
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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;
/**
* \ingroup core
* \class QgsSymbolLayerUtils
*/
class CORE_EXPORT QgsSymbolLayerUtils
{
public:
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 );
/**
* Decodes a \a value representing an arrow head type.
* \since QGIS 3.2
*/
static QgsArrowSymbolLayer::HeadType decodeArrowHeadType( const QVariant &value, bool *ok SIP_OUT = nullptr );
/**
* Decodes a \a value representing an arrow type.
* \since QGIS 3.2
*/
static QgsArrowSymbolLayer::ArrowType decodeArrowType( const QVariant &value, bool *ok SIP_OUT = nullptr );
/**
* Encodes a QPointF to a string.
* \see decodePoint()
* \see encodeSize()
*/
static QString encodePoint( QPointF point );
/**
* Decodes a QSizeF from a string.
* \see encodePoint()
* \see decodeSize()
*/
static QPointF decodePoint( const QString &string );
/**
* Converts a \a value to a point.
*
* \param value value to convert
* \param ok if specified, will be set to TRUE if value was successfully converted
*
* \returns converted point
*
* \see decodePoint()
* \see toSize()
* \since QGIS 3.10
*/
static QPointF toPoint( const QVariant &value, bool *ok SIP_OUT = nullptr );
/**
* Encodes a QSizeF to a string.
* \see decodeSize()
* \see encodePoint()
* \since QGIS 3.0
*/
static QString encodeSize( QSizeF size );
/**
* Decodes a QSizeF from a string.
* \see encodeSize()
* \see decodePoint()
* \since QGIS 3.0
*/
static QSizeF decodeSize( const QString &string );
/**
* Converts a \a value to a size.
*
* \param value value to convert
* \param ok if specified, will be set to TRUE if value was successfully converted
*
* \returns converted size
*
* \see decodeSize()
* \see toPoint()
* \since QGIS 3.10
*/
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 );
/**
* Encodes a render unit into an SLD unit of measure string.
* \param unit unit to encode
* \param scaleFactor if specified, will be set to scale factor for unit of measure
* \returns encoded string
* \see decodeSldUom()
*/
static QString encodeSldUom( QgsUnitTypes::RenderUnit unit, double *scaleFactor );
/**
* Decodes a SLD unit of measure string to a render unit.
* \param str string to decode
* \param scaleFactor if specified, will be set to scale factor for unit of measure
* \returns matching render unit
* \see encodeSldUom()
*/
static QgsUnitTypes::RenderUnit decodeSldUom( const QString &str, double *scaleFactor = nullptr );
/**
* Returns the size scaled in pixels according to the uom attribute.
* \param uom The uom attribute from SLD 1.1 version
* \param size The original size
* \returns the size in pixels
* \since QGIS 3.0
*/
static double sizeInPixelsFromSldUom( const QString &uom, double size );
/**
* Encodes a symbol scale method to a string.
*
* \see decodeScaleMethod()
*/
static QString encodeScaleMethod( Qgis::ScaleMethod scaleMethod );
/**
* Decodes a symbol scale method from a string.
*
* \see encodeScaleMethod()
*/
static Qgis::ScaleMethod decodeScaleMethod( const QString &str );
static QPainter::CompositionMode decodeBlendMode( const QString &s );
/**
* Returns an icon preview for a color ramp.
* \param symbol symbol
* \param size target pixmap size
* \param padding space between icon edge and symbol
* \param shape optional legend patch shape to use for rendering the preview icon
* \see symbolPreviewPixmap()
*/
static QIcon symbolPreviewIcon( const QgsSymbol *symbol, QSize size, int padding = 0, QgsLegendPatchShape *shape = nullptr );
/**
* Returns a pixmap preview for a color ramp.
* \param symbol symbol
* \param size target pixmap size
* \param padding space between icon edge and symbol
* \param customContext render context to use when rendering symbol
* \param selected set to TRUE to render the symbol in a selected state
* \param expressionContext optional custom expression context
* \param shape optional legend patch shape to use for rendering the preview icon
* \note Parameter customContext added in QGIS 2.6
* \note Parameter selected added in QGIS 3.10
* \note Parameter expressionContext added in QGIS 3.10
* \note Parameter shape added in QGIS 3.14
* \see symbolPreviewIcon()
*/
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 );
/**
* Draws a symbol layer preview to a QPicture
* \param layer symbol layer to draw
* \param units size units
* \param size target size of preview picture
* \param scale map unit scale for preview
* \param parentSymbolType since QGIS 3.22, can be used to specify the parent symbol type so that geometry generator preview icons are correctly calculated
* \returns QPicture containing symbol layer preview
* \see symbolLayerPreviewIcon()
* \since QGIS 2.9
*/
static QPicture symbolLayerPreviewPicture( const QgsSymbolLayer *layer, QgsUnitTypes::RenderUnit units, QSize size, const QgsMapUnitScale &scale = QgsMapUnitScale(), Qgis::SymbolType parentSymbolType = Qgis::SymbolType::Hybrid );
/**
* Draws a symbol layer preview to an icon.
* \param layer symbol layer to draw
* \param u size units
* \param size target size of preview icon
* \param scale map unit scale for preview
* \param parentSymbolType since QGIS 3.22, can be used to specify the parent symbol type so that geometry generator preview icons are correctly calculated
* \returns icon containing symbol layer preview
* \see symbolLayerPreviewPicture()
*/
static QIcon symbolLayerPreviewIcon( const QgsSymbolLayer *layer, QgsUnitTypes::RenderUnit u, QSize size, const QgsMapUnitScale &scale = QgsMapUnitScale(), Qgis::SymbolType parentSymbolType = Qgis::SymbolType::Hybrid );
/**
* Returns an icon preview for a color ramp.
* \param ramp color ramp
* \param size target icon size
* \param padding space between icon edge and color ramp
* \see colorRampPreviewPixmap()
*/
static QIcon colorRampPreviewIcon( QgsColorRamp *ramp, QSize size, int padding = 0 );
/**
* Returns a pixmap preview for a color ramp.
* \param ramp color ramp
* \param size target pixmap size
* \param padding space between icon edge and color ramp
* \param direction direction to render pixmap (since QGIS 3.18)
* \param flipDirection set to TRUE to flip the direction of the ramp. For horizontal \a directions, ramps will be
* rendered left to right by default. For vertical \a directions, ramps will be rendered top to bottom by default. Setting
* this flag to TRUE will reverse these default directions.
* \param drawTransparentBackground set to FALSE to disable the checkerboard effect drawn below transparent colors in the ramp
* \see colorRampPreviewIcon()
*/
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 );
/**
* Draws a vertex symbol at (painter) coordinates x, y. (Useful to assist vertex editing.)
* \since QGIS 3.4.5
*/
static void drawVertexMarker( double x, double y, QPainter &p, Qgis::VertexMarkerType type, int markerSize );
//! Returns the maximum estimated bleed for the symbol
static double estimateMaxSymbolBleed( QgsSymbol *symbol, const QgsRenderContext &context );
/**
* Attempts to load a symbol from a DOM element
* \param element DOM element representing symbol
* \param context object to transform relative to absolute paths
* \returns decoded symbol, if possible
*/
static QgsSymbol *loadSymbol( const QDomElement &element, const QgsReadWriteContext &context ) SIP_FACTORY;
/**
* Attempts to load a symbol from a DOM element and cast it to a particular symbol
* type.
* \param element DOM element representing symbol
* \param context object to transform relative to absolute paths
* \returns decoded symbol cast to specified type, if possible
* \note not available in Python bindings
*/
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;
}
}
//! Reads and returns symbol layer from XML. Caller is responsible for deleting the returned object
static QgsSymbolLayer *loadSymbolLayer( QDomElement &element, const QgsReadWriteContext &context ) SIP_FACTORY;
//! Writes a symbol definition to XML
static QDomElement saveSymbol( const QString &symbolName, const QgsSymbol *symbol, QDomDocument &doc, const QgsReadWriteContext &context );
/**
* Returns a string representing the symbol. Can be used to test for equality
* between symbols.
* \since QGIS 2.12
*/
static QString symbolProperties( QgsSymbol *symbol );
/**
* Creates a symbol layer list from a DOM \a element.
*/
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;
/**
* Converts a polygon symbolizer \a element to a list of marker symbol layers.
*/
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 );
//! \note not available in Python bindings
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 );
//! \note available in Python as wellKnownMarkerFromSld2
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 );
//! Create ogr feature style string for pen
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 );
/**
* Create ogr feature style string for brush
* \param fillColr fill color
*/
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 );
/**
* \brief Creates a SE 1.1 anchor point element as a child of the specified element
* \param doc The document
* \param element The parent element
* \param anchor An anchor specification, with values between 0 and 1
*/
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 );
/**
* Creates a OGC Expression element based on the provided function expression
* \param doc The document owning the element
* \param element The element parent
* \param function The expression to be encoded
*/
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 );
//! Parses the properties from XML and returns a map
static QVariantMap parseProperties( const QDomElement &element );
//! Saves the map of properties to XML
static void saveProperties( QVariantMap props, QDomDocument &doc, QDomElement &element );
//! Reads a collection of symbols from XML and returns them in a map. Caller is responsible for deleting returned symbols.
static QgsSymbolMap loadSymbols( QDomElement &element, const QgsReadWriteContext &context ) SIP_FACTORY;
//! Writes a collection of symbols to XML with specified tagName for the top-level element
static QDomElement saveSymbols( QgsSymbolMap &symbols, const QString &tagName, QDomDocument &doc, const QgsReadWriteContext &context );
static void clearSymbolMap( QgsSymbolMap &symbols );
/**
* Creates new mime data from a \a symbol.
* This also sets the mime color data to match the symbol's color, so that copied symbols
* can be paste in places where a color is expected.
* \see symbolFromMimeData()
* \since QGIS 3.0
*/
static QMimeData *symbolToMimeData( const QgsSymbol *symbol ) SIP_FACTORY;
/**
* Attempts to parse \a mime data as a symbol. A new symbol instance will be returned
* if the data was successfully converted to a symbol.
* \see symbolToMimeData()
* \since QGIS 3.0
*/
static QgsSymbol *symbolFromMimeData( const QMimeData *data ) SIP_FACTORY;
/**
* Creates a color ramp from the settings encoded in an XML element
* \param element DOM element
* \returns new color ramp. Caller takes responsibility for deleting the returned value.
* \see saveColorRamp()
*/
static QgsColorRamp *loadColorRamp( QDomElement &element ) SIP_FACTORY;
/**
* Encodes a color ramp's settings to an XML element
* \param name name of ramp
* \param ramp color ramp to save
* \param doc XML document
* \returns DOM element representing state of color ramp
* \see loadColorRamp()
*/
static QDomElement saveColorRamp( const QString &name, QgsColorRamp *ramp, QDomDocument &doc );
/**
* Saves a color ramp to a QVariantMap, wrapped in a QVariant.
* You can use QgsXmlUtils::writeVariant to save it to an XML document.
*
* \see loadColorRamp( const QVariant &value )
*/
static QVariant colorRampToVariant( const QString &name, QgsColorRamp *ramp );
/**
* Load a color ramp from a QVariantMap, wrapped in a QVariant.
* You can use QgsXmlUtils::readVariant to load it from an XML document.
*
* \see colorRampToVariant()
*/
static QgsColorRamp *loadColorRamp( const QVariant &value ) SIP_FACTORY;
/**
* Returns a friendly display name for a color
* \param color source color
* \returns display name for color
* \since QGIS 2.5
*/
static QString colorToName( const QColor &color );
/**
* Attempts to parse a string as a list of colors using a variety of common formats, including hex
* codes, rgb and rgba strings.
* \param colorStr string representing the color list
* \returns list of parsed colors
* \since QGIS 2.5
*/
static QList< QColor > parseColorList( const QString &colorStr );
/**
* Creates mime data from a color. Sets both the mime data's color data, and the
* mime data's text with the color's hex code.
* \param color color to encode as mime data
* \see colorFromMimeData
* \since QGIS 2.5
*/
static QMimeData *colorToMimeData( const QColor &color ) SIP_FACTORY;
/**
* Attempts to parse mime data as a color
* \param data mime data to parse
* \param hasAlpha will be set to TRUE if mime data was interpreted as a color containing
* an explicit alpha value
* \returns valid color if mimedata could be interpreted as a color, otherwise an invalid color
* \since QGIS 2.5
*/
static QColor colorFromMimeData( const QMimeData *data, bool &hasAlpha SIP_OUT );
/**
* Attempts to parse mime data as a list of named colors
* \param data mime data to parse
* \returns list of parsed colors
* \since QGIS 2.5
*/
static QgsNamedColorList colorListFromMimeData( const QMimeData *data );
/**
* Creates mime data from a list of named colors
* \param colorList list of named colors
* \param allFormats set to TRUE to include additional mime formats, include text/plain and application/x-color
* \returns mime data containing encoded colors
* \since QGIS 2.5
*/
static QMimeData *colorListToMimeData( const QgsNamedColorList &colorList, bool allFormats = true ) SIP_FACTORY;
/**
* Exports colors to a gpl GIMP palette file
* \param file destination file
* \param paletteName name of palette, which is stored in gpl file
* \param colors colors to export
* \returns TRUE if export was successful
* \see importColorsFromGpl
*/
static bool saveColorsToGpl( QFile &file, const QString &paletteName, const QgsNamedColorList &colors );
/**
* Imports colors from a gpl GIMP palette file
* \param file source gpl file
* \param ok will be TRUE if file was successfully read
* \param name will be set to palette name from gpl file, if present
* \returns list of imported colors
* \see saveColorsToGpl
*/
static QgsNamedColorList importColorsFromGpl( QFile &file, bool &ok, QString &name );
/**
* Attempts to parse a string as a color using a variety of common formats, including hex
* codes, rgb and rgba strings.
* \param colorStr string representing the color
* \param strictEval set to TRUE for stricter color parsing rules
* \returns parsed color
* \since QGIS 2.3
*/
static QColor parseColor( const QString &colorStr, bool strictEval = false );
/**
* Attempts to parse a string as a color using a variety of common formats, including hex
* codes, rgb and rgba, hsl and hsla strings.
* \param colorStr string representing the color
* \param containsAlpha if colorStr contains an explicit alpha value then containsAlpha will be set to TRUE
* \param strictEval set to TRUE for stricter color parsing rules
* \returns parsed color
* \since QGIS 2.3
*/
static QColor parseColorWithAlpha( const QString &colorStr, bool &containsAlpha, bool strictEval = false );
/**
* Multiplies opacity of image pixel values with a (global) transparency value.
*/
static void multiplyImageOpacity( QImage *image, qreal opacity );
//! Blurs an image in place, e.g. creating Qt-independent drop shadows
static void blurImageInPlace( QImage &image, QRect rect, int radius, bool alphaOnly );
/**
* Converts a QColor into a premultiplied ARGB QColor value using a specified alpha value
* \since QGIS 2.3
*/
static void premultiplyColor( QColor &rgb, int alpha );
/**
* Attempts to condense a \a fill and \a outline layer, by moving the outline layer to the
* fill symbol's stroke.
*
* This will only be done if the \a outline can be transformed into a stroke on the fill layer
* losslessly. If so, \a fill will be updated in place with the new stroke. Any existing stroke
* settings in \a fill will be replaced.
*
* Returns TRUE if the fill and outline were successfully condensed.
*
* \since QGIS 3.20
*/
static bool condenseFillAndOutline( QgsFillSymbolLayer *fill, QgsLineSymbolLayer *outline );
//! Sorts the passed list in requested order
static void sortVariantList( QList<QVariant> &list, Qt::SortOrder order );
//! Returns a point on the line from startPoint to directionPoint that is a certain distance away from the starting point
static QPointF pointOnLineWithDistance( QPointF startPoint, QPointF directionPoint, double distance );
//! Returns a list of all available svg files
static QStringList listSvgFiles();
//! Returns a list of svg files at the specified directory
static QStringList listSvgFilesAt( const QString &directory );
/**
* Determines an SVG symbol's path from its \a name.
* If \a name is not an absolute path the file is scanned for in the SVG paths specified
* in settings svg/searchPathsForSVG.
* \see svgSymbolPathToName()
*/
static QString svgSymbolNameToPath( const QString &name, const QgsPathResolver &pathResolver );
/**
* Determines an SVG symbol's name from its \a path.
* \see svgSymbolNameToPath()
*/
static QString svgSymbolPathToName( const QString &path, const QgsPathResolver &pathResolver );
//! Calculate the centroid point of a QPolygonF
static QPointF polygonCentroid( const QPolygonF &points );
//! Calculate a point on the surface of a QPolygonF
static QPointF polygonPointOnSurface( const QPolygonF &points, const QVector<QPolygonF> *rings = nullptr );
//! Calculate whether a point is within of a QPolygonF
static bool pointInPolygon( const QPolygonF &points, QPointF point );
/**
* Returns the total length of a \a polyline.
*
* \since QGIS 3.20
*/
static double polylineLength( const QPolygonF &polyline );
/**
* Returns the substring of a \a polyline which starts at \a startOffset from the beginning of the line
* and ends at \a endOffset from the start of the line.
*
* If \a startOffset is less than 0, then the start point will be calculated by subtracting that distance
* from the end of the line. Similarly, if \a endOffset is less than zero then the end point will be subtracted
* from the end of the line.
*
* May return an empty linestring if the substring is zero length.
*
* \since QGIS 3.16
*/
static QPolygonF polylineSubstring( const QPolygonF &polyline, double startOffset, double endOffset );
/**
* Returns TRUE if the angle formed by the line \a p1 - \a p2 - \a p3 forms a "sharp" corner.
*
* Sharp corners form an angle which exceeds a 45 degree threshold.
*
* \since QGIS 3.16
*/
static bool isSharpCorner( QPointF p1, QPointF p2, QPointF p3 );
/**
* Appends a polyline \a line to an existing \a target polyline.
*
* Any duplicate points at the start \a line which match the end point from \a target will be skipped.
*
* \since QGIS 3.16
*/
static void appendPolyline( QPolygonF &target, const QPolygonF &line );
/**
* Returns a new valid expression instance for given field or expression string.
* If the input is not a valid expression, it is assumed that it is a field name and gets properly quoted.
* If the string is empty, returns NULLPTR.
* This is useful when accepting input which could be either a non-quoted field name or expression.
* \since QGIS 2.2
*/
static QgsExpression *fieldOrExpressionToExpression( const QString &fieldOrExpression ) SIP_FACTORY;
/**
* Returns a field name if the whole expression is just a name of the field .
* Returns full expression string if the expression is more complex than just one field.
* Using just expression->expression() method may return quoted field name, but that is not
* wanted for saving (due to backward compatibility) or display in GUI.
* \since QGIS 2.2
*/
static QString fieldOrExpressionFromExpression( QgsExpression *expression );
/**
* Computes a sequence of about 'classes' equally spaced round values
* which cover the range of values from 'minimum' to 'maximum'.
* The values are chosen so that they are 1, 2 or 5 times a power of 10.
* \since QGIS 2.10
*/
static QList<double> prettyBreaks( double minimum, double maximum, int classes );
/**
* Rescales the given size based on the uomScale found in the props, if any is found, otherwise
* returns the value un-modified
* \since QGIS 3.0
*/
static double rescaleUom( double size, QgsUnitTypes::RenderUnit unit, const QVariantMap &props );
/**
* Rescales the given point based on the uomScale found in the props, if any is found, otherwise
* returns a copy of the original point
* \since QGIS 3.0
*/
static QPointF rescaleUom( QPointF point, QgsUnitTypes::RenderUnit unit, const QVariantMap &props ) SIP_PYNAME( rescalePointUom );
/**
* Rescales the given array based on the uomScale found in the props, if any is found, otherwise
* returns a copy of the original point
* \since QGIS 3.0
*/
static QVector<qreal> rescaleUom( const QVector<qreal> &array, QgsUnitTypes::RenderUnit unit, const QVariantMap &props ) SIP_PYNAME( rescaleArrayUom );
/**
* Checks if the properties contain scaleMinDenom and scaleMaxDenom, if available, they are added into the SE Rule element
* \since QGIS 3.0
*/
static void applyScaleDependency( QDomDocument &doc, QDomElement &ruleElem, QVariantMap &props );
/**
* Merges the local scale limits, if any, with the ones already in the map, if any
* \since QGIS 3.0
*/
static void mergeScaleDependencies( double mScaleMinDenom, double mScaleMaxDenom, QVariantMap &props );
/**
* Encodes a reference to a parametric SVG into SLD, as a succession of parametric SVG using URL parameters,
* a fallback SVG without parameters, and a final fallback as a mark with the right colors and stroke for systems
* that cannot do SVG at all
* \since QGIS 3.0
*/
static void parametricSvgToSld( QDomDocument &doc, QDomElement &graphicElem,
const QString &path,
const QColor &fillColor, double size, const QColor &strokeColor, double strokeWidth );
/**
* Encodes a reference to a parametric SVG into a path with parameters according to the SVG Parameters spec
* \since QGIS 3.0
*/
static QString getSvgParametricPath( const QString &basePath, const QColor &fillColor, const QColor &strokeColor, double strokeWidth );
/**
* Converts a set of symbol layer id to a set of pointers to actual symbol layers carried by the feature renderer.
* \since QGIS 3.12
*/
static QSet<const QgsSymbolLayer *> toSymbolLayerPointers( QgsFeatureRenderer *renderer, const QSet<QgsSymbolLayerId> &symbolLayerIds );
/**
* \brief Creates a new symbol with size restricted to min/max size if original size is out of min/max range
* \param s the original symbol
* \param minSize the minimum size in mm
* \param maxSize the maximum size in mm
* \param context the render context
* \param width expected width, can be changed by the function
* \param height expected height, can be changed by this function
* \return 0 if size is within minSize/maxSize range. New symbol if size was out of min/max range. Caller takes ownership
*/
static QgsSymbol *restrictedSizeSymbol( const QgsSymbol *s, double minSize, double maxSize, QgsRenderContext *context, double &width, double &height );
/**
* Evaluates a map of properties using the given \a context and returns a variant map with evaluated expressions from the properties.
* \since QGIS 3.18
*/
static QgsStringMap evaluatePropertiesMap( const QMap<QString, QgsProperty> &propertiesMap, const QgsExpressionContext &context );
///@cond PRIVATE
#ifndef SIP_RUN
static QgsProperty rotateWholeSymbol( double additionalRotation, const QgsProperty &property )
{
const QString exprString = property.asExpression();
return QgsProperty::fromExpression( QString::number( additionalRotation ) + " + (" + exprString + ')' );
}
static QgsProperty scaleWholeSymbol( double scaleFactor, const QgsProperty &property )
{
const QString exprString = property.asExpression();
return QgsProperty::fromExpression( QString::number( scaleFactor ) + "*(" + exprString + ')' );
}
static QgsProperty scaleWholeSymbol( double scaleFactorX, double scaleFactorY, const QgsProperty &property )
{
const 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
///@endcond
};
class QPolygonF;
//! calculate geometry shifted by a specified distance
QList<QPolygonF> offsetLine( QPolygonF polyline, double dist, QgsWkbTypes::GeometryType geometryType ) SIP_SKIP;
#endif