A paint effect which draws the source picture with minor or no alterations. More...

#include <qgspainteffect.h>

Inheritance diagram for QgsDrawSourceEffect:

Public Member Functions
	QgsDrawSourceEffect ()=default
	Constructor for QgsDrawSourceEffect. More...

QPainter::CompositionMode	blendMode () const
	Returns the blend mode for the effect. More...

QgsDrawSourceEffect *	clone () const override
	Duplicates an effect by creating a deep copy of the effect. More...

double	opacity () const
	Returns the opacity for the effect. More...

QgsStringMap	properties () const override
	Returns the properties describing the paint effect encoded in a string format. More...

void	readProperties (const QgsStringMap &props) override
	Reads a string map of an effect's properties and restores the effect to the state described by the properties map. More...

void	setBlendMode (const QPainter::CompositionMode mode)
	Sets the blend mode for the effect. More...

void	setOpacity (const double opacity)
	Sets the opacity for the effect. More...

QString	type () const override
	Returns the effect type. More...

Public Member Functions inherited from QgsPaintEffect
	QgsPaintEffect ()=default
	Constructor for QgsPaintEffect. More...

	QgsPaintEffect (const QgsPaintEffect &other)

virtual	~QgsPaintEffect ()

virtual void	begin (QgsRenderContext &context)
	Begins intercepting paint operations to a render context. More...

DrawMode	drawMode () const
	Returns the draw mode for the effect. More...

bool	enabled () const
	Returns whether the effect is enabled. More...

virtual void	end (QgsRenderContext &context)
	Ends interception of paint operations to a render context, and draws the result to the render context after being modified by the effect. More...

virtual bool	readProperties (const QDomElement &element)
	Restores the effect to the state described by a DOM element. More...

virtual void	render (QPicture &picture, QgsRenderContext &context)
	Renders a picture using the effect. More...

virtual bool	saveProperties (QDomDocument &doc, QDomElement &element) const
	Saves the current state of the effect to a DOM element. More...

void	setDrawMode (DrawMode drawMode)
	Sets the draw mode for the effect. More...

void	setEnabled (bool enabled)
	Sets whether the effect is enabled. More...

Static Public Member Functions
static QgsPaintEffect *	create (const QgsStringMap &map)
	Creates a new QgsDrawSource effect from a properties string map. More...

Protected Member Functions
void	draw (QgsRenderContext &context) override
	Handles drawing of the effect's result on to the specified render context. More...

Protected Member Functions inherited from QgsPaintEffect
virtual QRectF	boundingRect (const QRectF &rect, const QgsRenderContext &context) const
	Returns the bounding rect required for drawing the effect. More...

void	drawSource (QPainter &painter)
	Draws the source QPicture onto the specified painter. More...

void	fixQPictureDpi (QPainter *painter) const
	Applies a workaround to a QPainter to avoid an issue with incorrect scaling when drawing QPictures. More...

QPointF	imageOffset (const QgsRenderContext &context) const
	Returns the offset which should be used when drawing the source image on to a destination render context. More...

const QPicture *	source () const
	Returns the source QPicture. More...

QImage *	sourceAsImage (QgsRenderContext &context)
	Returns the source QPicture rendered to a new QImage. More...

Additional Inherited Members
Public Types inherited from QgsPaintEffect
enum	DrawMode { Modifier, Render, ModifyAndRender }
	Drawing modes for effects. More...

Protected Attributes inherited from QgsPaintEffect
DrawMode	mDrawMode = ModifyAndRender

bool	mEnabled = true

bool	requiresQPainterDpiFix = true

Detailed Description

A paint effect which draws the source picture with minor or no alterations.

The draw source effect can be used to draw an unaltered copy of the original source picture. Minor changes like lowering the opacity and applying a blend mode are supported, however these changes will force the resultant output to be rasterized. If no alterations are performed then the original picture will be rendered as a vector.

Since: QGIS 2.9

Definition at line 326 of file qgspainteffect.h.

Constructor & Destructor Documentation

◆ QgsDrawSourceEffect()

QgsDrawSourceEffect::QgsDrawSourceEffect ( )

default

Constructor for QgsDrawSourceEffect.

Member Function Documentation

◆ blendMode()

QPainter::CompositionMode QgsDrawSourceEffect::blendMode ( ) const

inline

Returns the blend mode for the effect.

Returns: blend mode used for drawing the source on to a destination paint device

See also: setBlendMode

Definition at line 375 of file qgspainteffect.h.

◆ clone()

QgsDrawSourceEffect * QgsDrawSourceEffect::clone ( ) const

overridevirtual

Duplicates an effect by creating a deep copy of the effect.

Returns: clone of paint effect

Implements QgsPaintEffect.

Definition at line 260 of file qgspainteffect.cpp.

◆ create()

QgsPaintEffect * QgsDrawSourceEffect::create ( const QgsStringMap & map )

static

Creates a new QgsDrawSource effect from a properties string map.

Parameters

map	encoded properties string map

Returns: new QgsDrawSourceEffect

Definition at line 229 of file qgspainteffect.cpp.

◆ draw()

void QgsDrawSourceEffect::draw ( QgsRenderContext & context )

overrideprotectedvirtual

Handles drawing of the effect's result on to the specified render context.

Derived classes must reimplement this method to apply any transformations to the source QPicture and draw the result using the context's painter.

Parameters

context destination render context

See also: drawSource

Implements QgsPaintEffect.

Definition at line 236 of file qgspainteffect.cpp.

◆ opacity()

double QgsDrawSourceEffect::opacity ( ) const

inline

Returns the opacity for the effect.

Returns: opacity value between 0 and 1 inclusive, where 0 is fully transparent and 1 is fully opaque

See also: setOpacity()

Definition at line 359 of file qgspainteffect.h.

◆ properties()

QgsStringMap QgsDrawSourceEffect::properties ( ) const

overridevirtual

Returns the properties describing the paint effect encoded in a string format.

Returns: string map of properties, in the form property key, value

See also: readProperties; saveProperties

Implements QgsPaintEffect.

Definition at line 265 of file qgspainteffect.cpp.

◆ readProperties()

void QgsDrawSourceEffect::readProperties ( const QgsStringMap & props )

overridevirtual

Reads a string map of an effect's properties and restores the effect to the state described by the properties map.

Parameters

props effect properties encoded in a string map

See also: properties

Implements QgsPaintEffect.

Definition at line 275 of file qgspainteffect.cpp.

◆ setBlendMode()

void QgsDrawSourceEffect::setBlendMode ( const QPainter::CompositionMode mode )

inline

Sets the blend mode for the effect.

Parameters

mode	blend mode used for drawing the source on to a destination paint device

See also: blendMode

Definition at line 367 of file qgspainteffect.h.

◆ setOpacity()

void QgsDrawSourceEffect::setOpacity ( const double opacity )

inline

Sets the opacity for the effect.

Parameters

opacity double between 0 and 1 inclusive, where 0 is fully transparent and 1 is fully opaque

See also: opacity()

Definition at line 351 of file qgspainteffect.h.

◆ type()

QString QgsDrawSourceEffect::type ( ) const

inlineoverridevirtual

Returns the effect type.

Returns: unique string representation of the effect type

Implements QgsPaintEffect.

Definition at line 340 of file qgspainteffect.h.

The documentation for this class was generated from the following files:

/build/qgis-3.10.0+15buster/src/core/effects/qgspainteffect.h
/build/qgis-3.10.0+15buster/src/core/effects/qgspainteffect.cpp

Public Member Functions

Static Public Member Functions

Protected Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ QgsDrawSourceEffect()

Member Function Documentation

◆ blendMode()

◆ clone()

◆ create()

◆ draw()

◆ opacity()

◆ properties()

◆ readProperties()

◆ setBlendMode()

◆ setOpacity()

◆ type()