33 QString expression =
properties.value( QStringLiteral(
"geometryModifier" ) ).toString();
34 if ( expression.isEmpty() )
36 expression = QStringLiteral(
"@geometry" );
40 if (
properties.value( QStringLiteral(
"SymbolType" ) ) == QLatin1String(
"Marker" ) )
44 else if (
properties.value( QStringLiteral(
"SymbolType" ) ) == QLatin1String(
"Line" ) )
59QgsGeometryGeneratorSymbolLayer::QgsGeometryGeneratorSymbolLayer(
const QString &expression )
62 , mSymbolType(
Qgis::SymbolType::Marker )
69 return QStringLiteral(
"GeometryGenerator" );
78 mSymbol = mFillSymbol.get();
84 mSymbol = mLineSymbol.get();
90 mSymbol = mMarkerSymbol.get();
118 mRenderingFeature =
true;
119 mHasRenderedFeature =
false;
124 mRenderingFeature =
false;
130 return mFillSymbol->usesMapUnits();
131 else if ( mLineSymbol )
132 return mLineSymbol->usesMapUnits();
133 else if ( mMarkerSymbol )
134 return mMarkerSymbol->usesMapUnits();
141 return mFillSymbol->color();
142 else if ( mLineSymbol )
143 return mLineSymbol->color();
144 else if ( mMarkerSymbol )
145 return mMarkerSymbol->color();
152 return mFillSymbol->outputUnit();
153 else if ( mLineSymbol )
154 return mLineSymbol->outputUnit();
155 else if ( mMarkerSymbol )
156 return mMarkerSymbol->outputUnit();
163 mFillSymbol->setOutputUnit( unit );
164 else if ( mLineSymbol )
165 mLineSymbol->setOutputUnit( unit );
166 else if ( mMarkerSymbol )
167 mMarkerSymbol->setOutputUnit( unit );
173 return mFillSymbol->mapUnitScale();
174 else if ( mLineSymbol )
175 return mLineSymbol->mapUnitScale();
176 else if ( mMarkerSymbol )
177 return mMarkerSymbol->mapUnitScale();
186 clone->mFillSymbol.reset( mFillSymbol->clone() );
188 clone->mLineSymbol.reset( mLineSymbol->clone() );
190 clone->mMarkerSymbol.reset( mMarkerSymbol->clone() );
192 clone->setSymbolType( mSymbolType );
193 clone->setUnits( mUnits );
204 props.insert( QStringLiteral(
"geometryModifier" ), mExpression->expression() );
205 switch ( mSymbolType )
208 props.insert( QStringLiteral(
"SymbolType" ), QStringLiteral(
"Marker" ) );
211 props.insert( QStringLiteral(
"SymbolType" ), QStringLiteral(
"Line" ) );
214 props.insert( QStringLiteral(
"SymbolType" ), QStringLiteral(
"Fill" ) );
233 if ( patchShapeGeometry.
isEmpty() )
249 originalSymbolType = mSymbol->
type();
278 return mExpression->expression();
283 switch ( symbol->
type() )
310 + mExpression->referencedColumns();
332 const QTransform painterToTargetUnits = QTransform::fromScale( scale, scale );
333 drawGeometry.transform( painterToTargetUnits );
341 QVariant value = mExpression->evaluate( &expressionContext );
342 QgsGeometry geom = QgsExpressionUtils::getGeometry( value, mExpression.get() );
345 geom.
transform( painterToTargetUnits.inverted( ) );
352 switch ( mSymbolType )
358 if ( !geoms.empty() )
359 return geoms.at( 0 );
366 if ( !geoms.empty() )
367 return geoms.at( 0 );
374 if ( !geoms.empty() )
375 return geoms.at( 0 );
386 if ( mRenderingFeature && mHasRenderedFeature )
401 switch ( geometryType )
405 Q_ASSERT( points->size() == 1 );
419 std::unique_ptr< QgsPolygon > polygon = std::make_unique< QgsPolygon >();
420 polygon->setExteriorRing( exterior.release() );
423 for (
const QPolygonF &ring : *rings )
428 drawGeometry =
QgsGeometry( std::move( polygon ) );
444 result.
transform( mapToPixel.inverted() );
452 QgsDebugError( QStringLiteral(
"Could no transform generated geometry to layer CRS" ) );
466 QVariant value = mExpression->evaluate( &expressionContext );
467 f.
setGeometry( coerceToExpectedType( QgsExpressionUtils::getGeometry( value, mExpression.get() ) ) );
487 result.
transform( mapToPixel.inverted() );
495 QgsDebugError( QStringLiteral(
"Could no transform generated geometry to layer CRS" ) );
515 if ( mRenderingFeature )
516 mHasRenderedFeature =
true;
The Qgis class provides global constants for use throughout the application.
@ IsSymbolLayerSubSymbol
Symbol is being rendered as a sub-symbol of a QgsSymbolLayer.
GeometryType
The geometry types are used to group Qgis::WkbType in a coarse way.
RenderUnit
Rendering size units.
@ Percentage
Percentage of another measurement (e.g., canvas size, feature size)
@ Millimeters
Millimeters.
@ Points
Points (e.g., for font sizes)
@ Unknown
Mixed or unknown units.
@ MetersInMapUnits
Meters value as Map units.
@ RenderingSubSymbol
Set whenever a sub-symbol of a parent symbol is currently being rendered. Can be used during symbol a...
@ MultiPolygon
MultiPolygon.
@ MultiLineString
MultiLineString.
@ Reverse
Reverse/inverse transform (from destination to source)
Custom exception class for Coordinate Reference System related exceptions.
RAII class to pop scope from an expression context on destruction.
Single scope for storing variables and functions for use within a QgsExpressionContext.
void setGeometry(const QgsGeometry &geometry)
Convenience function for setting a geometry for the scope.
Expression contexts are used to encapsulate the parameters around which a QgsExpression should be eva...
QgsFeature feature() const
Convenience function for retrieving the feature for the context, if set.
Class for parsing and evaluation of expressions (formerly called "search strings").
The feature class encapsulates a single feature including its unique ID, geometry and a list of field...
void setGeometry(const QgsGeometry &geometry)
Set the feature's geometry.
A fill symbol type, for rendering Polygon and MultiPolygon geometries.
static QgsFillSymbol * createSimple(const QVariantMap &properties)
Create a fill symbol with one symbol layer: SimpleFill with specified properties.
A symbol layer subclass which alters rendered feature shapes through the use of QGIS expressions.
bool usesMapUnits() const override
Returns true if the symbol layer has any components which use map unit based sizes.
QgsMapUnitScale mapUnitScale() const override
void drawPreviewIcon(QgsSymbolRenderContext &context, QSize size) override
QString geometryExpression() const
Gets the expression to generate this geometry.
bool hasDataDefinedProperties() const override
Returns true if the symbol layer (or any of its sub-symbols) contains data defined properties.
void setUnits(Qgis::RenderUnit units)
Sets the units for the geometry expression.
void setGeometryExpression(const QString &exp)
Set the expression to generate this geometry.
void setSymbolType(Qgis::SymbolType symbolType)
Set the type of symbol which should be created.
QString layerType() const override
Returns a string that represents this layer type.
bool setSubSymbol(QgsSymbol *symbol) override
Sets layer's subsymbol. takes ownership of the passed symbol.
bool isCompatibleWithSymbol(QgsSymbol *symbol) const override
Will always return true.
Qgis::SymbolType symbolType() const
Access the symbol type.
QVariantMap properties() const override
Should be reimplemented by subclasses to return a string map that contains the configuration informat...
void startRender(QgsSymbolRenderContext &context) override
Called before a set of rendering operations commences on the supplied render context.
QgsSymbol * subSymbol() override
Returns the symbol's sub symbol, if present.
QSet< QString > usedAttributes(const QgsRenderContext &context) const override
Returns the set of attributes referenced by the layer.
void setColor(const QColor &color) override
Sets the "representative" color for the symbol layer.
~QgsGeometryGeneratorSymbolLayer() override
static QgsSymbolLayer * create(const QVariantMap &properties)
Creates the symbol layer.
void setOutputUnit(Qgis::RenderUnit unit) override
Sets the units to use for sizes and widths within the symbol layer.
void stopFeatureRender(const QgsFeature &feature, QgsRenderContext &context) override
Called after the layer has been rendered for a particular feature.
QgsSymbolLayer * clone() const override
Shall be reimplemented by subclasses to create a deep copy of the instance.
void render(QgsSymbolRenderContext &context, Qgis::GeometryType geometryType=Qgis::GeometryType::Unknown, const QPolygonF *points=nullptr, const QVector< QPolygonF > *rings=nullptr)
Will render this symbol layer using the context.
void stopRender(QgsSymbolRenderContext &context) override
Called after a set of rendering operations has finished on the supplied render context.
QColor color() const override
Returns the "representative" color of the symbol layer.
void startFeatureRender(const QgsFeature &feature, QgsRenderContext &context) override
Called before the layer will be rendered for a particular feature.
Qgis::RenderUnit outputUnit() const override
Returns the units to use for sizes and widths within the symbol layer.
A geometry is the spatial representation of a feature.
QVector< QgsGeometry > coerceToType(Qgis::WkbType type, double defaultZ=0, double defaultM=0) const
Attempts to coerce this geometry into the specified destination type.
Qgis::GeometryOperationResult transform(const QgsCoordinateTransform &ct, Qgis::TransformDirection direction=Qgis::TransformDirection::Forward, bool transformZ=false)
Transforms this geometry as described by the coordinate transform ct.
static QgsGeometry fromPointXY(const QgsPointXY &point)
Creates a new geometry from a QgsPointXY object.
bool isEmpty() const
Returns true if the geometry is empty (eg a linestring with no vertices, or a collection with no geom...
Represents a patch shape for use in map legends.
QgsGeometry scaledGeometry(QSizeF size) const
Returns the patch shape's geometry, scaled to the given size.
bool isNull() const
Returns true if the patch shape is a null QgsLegendPatchShape, which indicates that the default legen...
void setScaleToOutputSize(bool scale)
Sets whether the patch shape should by resized to the desired target size when rendering.
static QgsLineString * fromQPolygonF(const QPolygonF &polygon)
Returns a new linestring from a QPolygonF polygon input.
A line symbol type, for rendering LineString and MultiLineString geometries.
static QgsLineSymbol * createSimple(const QVariantMap &properties)
Create a line symbol with one symbol layer: SimpleLine with specified properties.
QgsPointXY transform(const QgsPointXY &p) const
Transforms a point p from map (world) coordinates to device coordinates.
Struct for storing maximum and minimum scales for measurements in map units.
A marker symbol type, for rendering Point and MultiPoint geometries.
static QgsMarkerSymbol * createSimple(const QVariantMap &properties)
Create a marker symbol with one symbol layer: SimpleMarker with specified properties.
Contains information about the context of a rendering operation.
double convertToPainterUnits(double size, Qgis::RenderUnit unit, const QgsMapUnitScale &scale=QgsMapUnitScale(), Qgis::RenderSubcomponentProperty property=Qgis::RenderSubcomponentProperty::Generic) const
Converts a size from the specified units to painter units (pixels).
QPainter * painter()
Returns the destination QPainter for the render operation.
QgsExpressionContext & expressionContext()
Gets the expression context.
void setFlag(Qgis::RenderContextFlag flag, bool on=true)
Enable or disable a particular flag (other flags are not affected)
const QgsMapToPixel & mapToPixel() const
Returns the context's map to pixel transform, which transforms between map coordinates and device coo...
QgsCoordinateTransform coordinateTransform() const
Returns the current coordinate transform for the context.
Qgis::RenderContextFlags flags() const
Returns combination of flags used for rendering.
QgsLegendPatchShape defaultPatch(Qgis::SymbolType type, QSizeF size) const
Returns the default legend patch shape for the given symbol type.
static QgsStyle * defaultStyle(bool initialize=true)
Returns the default application-wide style.
bool shouldRenderUsingSelectionColor(const QgsSymbolRenderContext &context) const
Returns true if the symbol layer should be rendered using the selection color from the render context...
virtual QSet< QString > usedAttributes(const QgsRenderContext &context) const
Returns the set of attributes referenced by the layer.
void copyDataDefinedProperties(QgsSymbolLayer *destLayer) const
Copies all data defined properties of this layer to another symbol layer.
void restoreOldDataDefinedProperties(const QVariantMap &stringMap)
Restores older data defined properties from string map.
void copyPaintEffect(QgsSymbolLayer *destLayer) const
Copies paint effect of this layer to another symbol layer.
const QgsFeature * feature() const
Returns the current feature being rendered.
Qgis::GeometryType originalGeometryType() const
Returns the geometry type for the original feature geometry being rendered.
QgsFields fields() const
Fields of the layer.
QgsExpressionContextScope * expressionContextScope()
This scope is always available when a symbol of this type is being rendered.
const QgsLegendPatchShape * patchShape() const
Returns the symbol patch shape, to use if rendering symbol preview icons.
QgsRenderContext & renderContext()
Returns a reference to the context's render context.
Abstract base class for all rendered symbols.
QgsSymbolRenderContext * symbolRenderContext()
Returns the symbol render context.
void setRenderHints(Qgis::SymbolRenderHints hints)
Sets rendering hint flags for the symbol.
void renderFeature(const QgsFeature &feature, QgsRenderContext &context, int layer=-1, bool selected=false, bool drawVertexMarker=false, Qgis::VertexMarkerType currentVertexMarkerType=Qgis::VertexMarkerType::SemiTransparentCircle, double currentVertexMarkerSize=0.0)
Render a feature.
void stopRender(QgsRenderContext &context)
Ends the rendering process.
void setColor(const QColor &color) const
Sets the color for the symbol.
QSet< QString > usedAttributes(const QgsRenderContext &context) const
Returns a list of attributes required to render this feature.
void drawPreviewIcon(QPainter *painter, QSize size, QgsRenderContext *customContext=nullptr, bool selected=false, const QgsExpressionContext *expressionContext=nullptr, const QgsLegendPatchShape *patchShape=nullptr, const QgsScreenProperties &screen=QgsScreenProperties())
Draws an icon of the symbol that occupies an area given by size using the specified painter.
Qgis::SymbolType type() const
Returns the symbol's type.
void startRender(QgsRenderContext &context, const QgsFields &fields=QgsFields())
Begins the rendering process for the symbol.
static Q_INVOKABLE Qgis::RenderUnit decodeRenderUnit(const QString &string, bool *ok=nullptr)
Decodes a render unit from a string.
static Q_INVOKABLE QString encodeUnit(Qgis::DistanceUnit unit)
Encodes a distance unit to a string.
#define QgsDebugError(str)