29 for (
int i = 0; i < other.
count(); ++i )
38 std::swap( mEffectList, other.mEffectList );
58 for (
int i = 0; i < rhs.
count(); ++i )
68 std::swap( mEffectList, other.mEffectList );
82 QPainter *destPainter = context.
painter();
87 QPicture *sourcePic =
new QPicture( *
source() );
88 QPicture *currentPic = sourcePic;
89 QList< QPicture * > results;
90 for (
int i = mEffectList.count() - 1; i >= 0; --i )
98 QPicture *pic =
nullptr;
99 if (
effect->
type() == QLatin1String(
"drawSource" ) )
109 QPicture *resultPic =
new QPicture();
110 QPainter p( resultPic );
119 results << resultPic;
122 currentPic = resultPic;
130 for (
int i = 0; i < mEffectList.count(); ++i )
132 if ( !mEffectList[i]->
enabled() )
137 QPicture *pic = results.takeLast();
154 if ( element.isNull() )
159 QDomElement effectElement = doc.createElement( QStringLiteral(
"effect" ) );
160 effectElement.setAttribute( QStringLiteral(
"type" ),
type() );
161 effectElement.setAttribute( QStringLiteral(
"enabled" ),
mEnabled );
170 element.appendChild( effectElement );
176 if ( element.isNull() )
181 mEnabled = ( element.attribute( QStringLiteral(
"enabled" ), QStringLiteral(
"0" ) ) != QLatin1String(
"0" ) );
186 const QDomNodeList childNodes = element.childNodes();
187 for (
int i = 0; i < childNodes.size(); ++i )
189 const QDomElement childElement = childNodes.at( i ).toElement();
208void QgsEffectStack::clearStack()
210 qDeleteAll( mEffectList );
216 mEffectList.append(
effect );
221 if ( index < 0 || index > mEffectList.count() )
226 mEffectList.insert( index,
effect );
232 if ( index < 0 || index >= mEffectList.count() )
237 delete mEffectList.at( index );
238 mEffectList[index] =
effect;
244 if ( index < 0 || index >= mEffectList.count() )
247 return mEffectList.takeAt( index );
257 if ( index >= 0 && index < mEffectList.count() )
259 return mEffectList.at( index );
static QgsPaintEffectRegistry * paintEffectRegistry()
Returns the application's paint effect registry, used for managing paint effects.
A paint effect which consists of a stack of other chained paint effects.
void appendEffect(QgsPaintEffect *effect)
Appends an effect to the end of the stack.
bool saveProperties(QDomDocument &doc, QDomElement &element) const override
Saves the current state of the effect to a DOM element.
void draw(QgsRenderContext &context) override
Handles drawing of the effect's result on to the specified render context.
QgsEffectStack & operator=(const QgsEffectStack &rhs)
QString type() const override
Returns the effect type.
static QgsPaintEffect * create(const QVariantMap &map)
Creates a new QgsEffectStack effect.
bool readProperties(const QDomElement &element) override
Restores the effect to the state described by a DOM element.
~QgsEffectStack() override
QList< QgsPaintEffect * > * effectList()
Returns a pointer to the list of effects currently contained by the stack.
QVariantMap properties() const override
Unused for QgsEffectStack, will always return an empty string map.
int count() const
Returns count of effects contained by the stack.
QgsEffectStack * clone() const override
Duplicates an effect by creating a deep copy of the effect.
bool insertEffect(int index, QgsPaintEffect *effect)
Inserts an effect at a specified index within the stack.
QgsPaintEffect * takeEffect(int index)
Removes an effect from the stack and returns a pointer to it.
bool changeEffect(int index, QgsPaintEffect *effect)
Replaces the effect at a specified position within the stack.
QgsPaintEffect * effect(int index) const
Returns a pointer to the effect at a specified index within the stack.
QgsPaintEffect * createEffect(const QString &name, const QVariantMap &properties=QVariantMap()) const
Creates a new paint effect given the effect name and properties map.
Base class for visual effects which can be applied to QPicture drawings.
bool requiresQPainterDpiFix
virtual bool saveProperties(QDomDocument &doc, QDomElement &element) const
Saves the current state of the effect to a DOM element.
virtual void readProperties(const QVariantMap &props)=0
Reads a string map of an effect's properties and restores the effect to the state described by the pr...
virtual void render(QPicture &picture, QgsRenderContext &context)
Renders a picture using the effect.
const QPicture * source() const
Returns the source QPicture.
bool enabled() const
Returns whether the effect is enabled.
virtual QgsPaintEffect * clone() const =0
Duplicates an effect by creating a deep copy of the effect.
@ Render
The result of the effect is rendered on the destination, but does not affect subsequent effects in th...
@ Modifier
The result of the effect is not rendered, but is passed on to following effects in the stack.
virtual QString type() const =0
Returns the effect type.
static void drawPicture(QPainter *painter, const QPointF &point, const QPicture &picture)
Draws a picture onto a painter, correctly applying workarounds to avoid issues with incorrect scaling...
Contains information about the context of a rendering operation.
QPainter * painter()
Returns the destination QPainter for the render operation.
void setPainter(QPainter *p)
Sets the destination QPainter for the render operation.