16#ifndef QGSARROWSYMBOLLAYER_H
17#define QGSARROWSYMBOLLAYER_H
52 QSet<QString> usedAttributes( const
QgsRenderContext &context ) const override;
53 bool hasDataDefinedProperties() const override;
54 bool usesMapUnits() const override;
55 void setOutputUnit(
Qgis::RenderUnit unit ) override;
58 double arrowWidth()
const {
return mArrowWidth; }
150 void setColor(
const QColor &
c )
override;
151 QColor
color()
const override;
160 std::unique_ptr<QgsFillSymbol> mSymbol;
162 double mArrowWidth = 1.0;
166 double mArrowStartWidth = 1.0;
170 double mHeadLength = 1.5;
173 double mHeadThickness = 1.5;
177 HeadType mHeadType = HeadSingle;
178 ArrowType mArrowType = ArrowPlain;
179 bool mIsCurved =
true;
180 bool mIsRepeated =
true;
182 double mScaledArrowWidth = 1.0;
183 double mScaledArrowStartWidth = 1.0;
184 double mScaledHeadLength = 1.5;
185 double mScaledHeadThickness = 1.5;
186 double mScaledOffset = 0.0;
187 HeadType mComputedHeadType = HeadSingle;
188 ArrowType mComputedArrowType = ArrowPlain;
190 std::unique_ptr<QgsExpressionContextScope> mExpressionScope;
The Qgis class provides global constants for use throughout the application.
RenderUnit
Rendering size units.
@ Millimeters
Millimeters.
Line symbol layer used for representing lines as arrows.
bool isCurved() const
Returns whether it is a curved arrow or a straight one.
ArrowType arrowType() const
Gets the current arrow type.
HeadType
Possible head types.
HeadType headType() const
Gets the current head type.
void setArrowStartWidth(double width)
Sets the arrow start width.
bool isRepeated() const
Returns whether the arrow is repeated along the line or not.
void setArrowWidth(double width)
Sets the arrow width.
void setArrowType(ArrowType type)
Sets the arrow type.
void setHeadLengthUnitScale(const QgsMapUnitScale &scale)
Sets the scale for the head length.
~QgsArrowSymbolLayer() override
QgsMapUnitScale headThicknessUnitScale() const
Gets the scale for the head height.
Qgis::RenderUnit arrowWidthUnit() const
Gets the unit for the arrow width.
Qgis::RenderUnit headLengthUnit() const
Gets the unit for the head length.
Qgis::RenderUnit headThicknessUnit() const
Gets the unit for the head height.
void setArrowWidthUnit(Qgis::RenderUnit unit)
Sets the unit for the arrow width.
void setIsCurved(bool isCurved)
Sets whether it is a curved arrow or a straight one.
void setHeadThickness(double thickness)
Sets the arrow head height.
void setHeadLengthUnit(Qgis::RenderUnit unit)
Sets the unit for the head length.
void setIsRepeated(bool isRepeated)
Sets whether the arrow is repeated along the line.
double arrowStartWidth() const
Gets current arrow start width. Only meaningful for single headed arrows.
void setArrowStartWidthUnitScale(const QgsMapUnitScale &scale)
Sets the scale for the arrow start width.
void setHeadThicknessUnitScale(const QgsMapUnitScale &scale)
Sets the scale for the head height.
void setHeadType(HeadType type)
Sets the head type.
QgsMapUnitScale arrowStartWidthUnitScale() const
Gets the scale for the arrow start width.
double headThickness() const
Gets the current arrow head height.
void setArrowWidthUnitScale(const QgsMapUnitScale &scale)
Sets the scale for the arrow width.
ArrowType
Possible arrow types.
QgsMapUnitScale arrowWidthUnitScale() const
Gets the scale for the arrow width.
void setArrowStartWidthUnit(Qgis::RenderUnit unit)
Sets the unit for the arrow start width.
Qgis::RenderUnit arrowStartWidthUnit() const
Gets the unit for the arrow start width.
QgsMapUnitScale headLengthUnitScale() const
Gets the scale for the head length.
void setHeadLength(double length)
Sets the arrow head length.
double headLength() const
Gets the current arrow head length.
void setHeadThicknessUnit(Qgis::RenderUnit unit)
Sets the unit for the head height.
A fill symbol type, for rendering Polygon and MultiPolygon geometries.
virtual void renderPolyline(const QPolygonF &points, QgsSymbolRenderContext &context)=0
Renders the line symbol layer along the line joining points, using the given render context.
virtual double width() const
Returns the estimated width for the line symbol layer.
Struct for storing maximum and minimum scales for measurements in map units.
Contains information about the context of a rendering operation.
Qgis::SymbolType type() const
virtual void startRender(QgsSymbolRenderContext &context)=0
Called before a set of rendering operations commences on the supplied render context.
virtual QVariantMap properties() const =0
Should be reimplemented by subclasses to return a string map that contains the configuration informat...
virtual QString layerType() const =0
Returns a string that represents this layer type.
virtual void stopRender(QgsSymbolRenderContext &context)=0
Called after a set of rendering operations has finished on the supplied render context.
virtual void setColor(const QColor &color)
Sets the "representative" color for the symbol layer.
virtual QColor color() const
Returns the "representative" color of the symbol layer.
virtual bool canCauseArtifactsBetweenAdjacentTiles() const
Returns true if the symbol layer rendering can cause visible artifacts across a single feature when t...
Abstract base class for all rendered symbols.
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