QGIS API Documentation 3.41.0-Master (d5b93354e9c)
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qgslayoutitemmapoverview.cpp
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1/***************************************************************************
2 qgslayoutitemmapoverview.cpp
3 --------------------
4 begin : October 2017
5 copyright : (C) 2017 by Nyall Dawson
6 email : nyall dot dawson at gmail dot com
7 ***************************************************************************/
8
9/***************************************************************************
10 * *
11 * This program is free software; you can redistribute it and/or modify *
12 * it under the terms of the GNU General Public License as published by *
13 * the Free Software Foundation; either version 2 of the License, or *
14 * (at your option) any later version. *
15 * *
16 ***************************************************************************/
17
19#include "moc_qgslayoutitemmapoverview.cpp"
20#include "qgslayoutitemmap.h"
21#include "qgslayout.h"
22#include "qgssymbollayerutils.h"
23#include "qgssymbol.h"
24#include "qgspainting.h"
25#include "qgsreadwritecontext.h"
26#include "qgslayoututils.h"
27#include "qgsexception.h"
28#include "qgsvectorlayer.h"
31#include "qgsfillsymbol.h"
32
33#include <QPainter>
34
36 : QgsLayoutItemMapItem( name, map )
37 , mExtentLayer( std::make_unique< QgsVectorLayer >( QStringLiteral( "Polygon?crs=EPSG:4326" ), tr( "Overview" ), QStringLiteral( "memory" ), QgsVectorLayer::LayerOptions( map && map->layout() && map->layout()->project() ? map->layout()->project()->transformContext() : QgsCoordinateTransformContext() ) ) )
38{
39 createDefaultFrameSymbol();
40}
41
43
44void QgsLayoutItemMapOverview::createDefaultFrameSymbol()
45{
46 QVariantMap properties;
47 properties.insert( QStringLiteral( "color" ), QStringLiteral( "255,0,0,75" ) );
48 properties.insert( QStringLiteral( "style" ), QStringLiteral( "solid" ) );
49 properties.insert( QStringLiteral( "style_border" ), QStringLiteral( "no" ) );
50 mFrameSymbol.reset( QgsFillSymbol::createSimple( properties ) );
51
52 mExtentLayer->setRenderer( new QgsSingleSymbolRenderer( mFrameSymbol->clone() ) );
53}
54
55void QgsLayoutItemMapOverview::draw( QPainter *painter )
56{
57 if ( !mEnabled || !mFrameMap || !mMap || !mMap->layout() )
58 {
59 return;
60 }
61 if ( !painter )
62 {
63 return;
64 }
65
66 const QgsLayoutItemMap *overviewFrameMap = linkedMap();
67 if ( !overviewFrameMap )
68 {
69 return;
70 }
71
72 //get polygon for other overview frame map's extent (use visibleExtentPolygon as it accounts for map rotation)
73 QPolygonF otherExtent = overviewFrameMap->visibleExtentPolygon();
74 if ( overviewFrameMap->crs() !=
75 mMap->crs() )
76 {
77 QgsGeometry g = QgsGeometry::fromQPolygonF( otherExtent );
78
79 // reproject extent
80 QgsCoordinateTransform ct( overviewFrameMap->crs(),
81 mMap->crs(), mLayout->project() );
82 g = g.densifyByCount( 20 );
83 try
84 {
85 g.transform( ct );
86 }
87 catch ( QgsCsException & )
88 {
89 }
90
91 otherExtent = g.asQPolygonF();
92 }
93
94 //get current map's extent as a QPolygonF
95 QPolygonF thisExtent = mMap->visibleExtentPolygon();
96 //intersect the two
97 QPolygonF intersectExtent = thisExtent.intersected( otherExtent );
98
99 //setup painter scaling to dots so that raster symbology is drawn to scale
100 double dotsPerMM = painter->device()->logicalDpiX() / 25.4;
101
102 //setup render context
104 context.setForceVectorOutput( true );
105 QgsExpressionContext expressionContext = createExpressionContext();
106 context.setExpressionContext( expressionContext );
107
108 QgsScopedQPainterState painterState( painter );
109 context.setPainterFlagsUsingContext( painter );
110
111 painter->setCompositionMode( mBlendMode );
112 painter->translate( mMap->mXOffset, mMap->mYOffset );
113 painter->scale( 1 / dotsPerMM, 1 / dotsPerMM ); // scale painter from mm to dots
114
115 mFrameSymbol->startRender( context );
116
117 //construct a polygon corresponding to the intersecting map extent
118 //need to scale line to dots, rather then mm, since the painter has been scaled to dots
119 QTransform mapTransform;
120 QPolygonF thisRectPoly = QPolygonF( QRectF( 0, 0, dotsPerMM * mMap->rect().width(), dotsPerMM * mMap->rect().height() ) );
121
122 //workaround QT Bug #21329
123 thisRectPoly.pop_back();
124 thisExtent.pop_back();
125
126 //create transform from map coordinates to painter coordinates
127 QTransform::quadToQuad( thisExtent, thisRectPoly, mapTransform );
128 QPolygonF intersectPolygon;
129 intersectPolygon = mapTransform.map( intersectExtent );
130
131 QVector<QPolygonF> rings; //empty list
132 if ( !mInverted )
133 {
134 //Render the intersecting map extent
135 mFrameSymbol->renderPolygon( intersectPolygon, &rings, nullptr, context );
136 }
137 else
138 {
139 //We are inverting the overview frame (ie, shading outside the intersecting extent)
140 //Construct a polygon corresponding to the overview map extent
141 QPolygonF outerPolygon;
142 outerPolygon << QPointF( 0, 0 )
143 << QPointF( mMap->rect().width() * dotsPerMM, 0 )
144 << QPointF( mMap->rect().width() * dotsPerMM, mMap->rect().height() * dotsPerMM )
145 << QPointF( 0, mMap->rect().height() * dotsPerMM )
146 << QPointF( 0, 0 );
147
148 //Intersecting extent is an inner ring for the shaded area
149 rings.append( intersectPolygon );
150 mFrameSymbol->renderPolygon( outerPolygon, &rings, nullptr, context );
151 }
152
153 mFrameSymbol->stopRender( context );
154}
155
156bool QgsLayoutItemMapOverview::writeXml( QDomElement &elem, QDomDocument &doc, const QgsReadWriteContext &context ) const
157{
158 if ( elem.isNull() )
159 {
160 return false;
161 }
162
163 //overview map frame
164 QDomElement overviewFrameElem = doc.createElement( QStringLiteral( "ComposerMapOverview" ) );
165
166 overviewFrameElem.setAttribute( QStringLiteral( "frameMap" ), mFrameMap ? mFrameMap ->uuid() : QString() );
167 overviewFrameElem.setAttribute( QStringLiteral( "blendMode" ), static_cast< int >( QgsPainting::getBlendModeEnum( mBlendMode ) ) );
168 overviewFrameElem.setAttribute( QStringLiteral( "inverted" ), mInverted );
169 overviewFrameElem.setAttribute( QStringLiteral( "centered" ), mCentered );
170
171 QDomElement frameStyleElem = QgsSymbolLayerUtils::saveSymbol( QString(), mFrameSymbol.get(), doc, context );
172 overviewFrameElem.appendChild( frameStyleElem );
173
174 bool ok = QgsLayoutItemMapItem::writeXml( overviewFrameElem, doc, context );
175 elem.appendChild( overviewFrameElem );
176 return ok;
177}
178
179bool QgsLayoutItemMapOverview::readXml( const QDomElement &itemElem, const QDomDocument &doc, const QgsReadWriteContext &context )
180{
181 Q_UNUSED( doc )
182 if ( itemElem.isNull() )
183 {
184 return false;
185 }
186
187 bool ok = QgsLayoutItemMapItem::readXml( itemElem, doc, context );
188
189 mFrameMapUuid = itemElem.attribute( QStringLiteral( "frameMap" ) );
190 setLinkedMap( nullptr );
191
192 mBlendMode = QgsPainting::getCompositionMode( static_cast< Qgis::BlendMode >( itemElem.attribute( QStringLiteral( "blendMode" ), QStringLiteral( "0" ) ).toUInt() ) );
193 mInverted = ( itemElem.attribute( QStringLiteral( "inverted" ), QStringLiteral( "0" ) ) != QLatin1String( "0" ) );
194 mCentered = ( itemElem.attribute( QStringLiteral( "centered" ), QStringLiteral( "0" ) ) != QLatin1String( "0" ) );
195
196 QDomElement frameStyleElem = itemElem.firstChildElement( QStringLiteral( "symbol" ) );
197 if ( !frameStyleElem.isNull() )
198 {
199 mFrameSymbol.reset( QgsSymbolLayerUtils::loadSymbol<QgsFillSymbol>( frameStyleElem, context ) );
200 }
201 return ok;
202}
203
205{
206 if ( !mFrameMapUuid.isEmpty() )
207 {
208 setLinkedMap( qobject_cast< QgsLayoutItemMap * >( mLayout->itemByUuid( mFrameMapUuid, true ) ) );
209 }
210}
211
213{
214 return mBlendMode != QPainter::CompositionMode_SourceOver;
215}
216
218{
219 if ( mFrameMap == map )
220 {
221 //no change
222 return;
223 }
224
225 //disconnect old map
226 if ( mFrameMap )
227 {
230 }
231 mFrameMap = map;
232 //connect to new map signals
235}
236
238{
239 return mFrameMap;
240}
241
243{
244 if ( !mMap )
245 {
246 return;
247 }
248
249 if ( mFrameMap )
250 {
253 }
254}
255
257{
258 if ( !mEnabled || !mFrameMap || !mMap || !mMap->layout() )
259 {
260 return nullptr;
261 }
262
263 const QgsLayoutItemMap *overviewFrameMap = linkedMap();
264 if ( !overviewFrameMap )
265 {
266 return nullptr;
267 }
268
269 //get polygon for other overview frame map's extent (use visibleExtentPolygon as it accounts for map rotation)
270 QPolygonF otherExtent = overviewFrameMap->visibleExtentPolygon();
271 QgsGeometry g = QgsGeometry::fromQPolygonF( otherExtent );
272
273 if ( overviewFrameMap->crs() != mMap->crs() )
274 {
275 // reproject extent
276 QgsCoordinateTransform ct( overviewFrameMap->crs(),
277 mMap->crs(), mLayout->project() );
278 g = g.densifyByCount( 20 );
279 try
280 {
281 g.transform( ct );
282 }
283 catch ( QgsCsException & )
284 {
285 }
286 }
287
288 //get current map's extent as a QPolygonF
289 QPolygonF thisExtent = mMap->visibleExtentPolygon();
290 QgsGeometry thisGeom = QgsGeometry::fromQPolygonF( thisExtent );
291 //intersect the two
292 QgsGeometry intersectExtent = thisGeom.intersection( g );
293
294 mExtentLayer->setBlendMode( mBlendMode );
295
296 static_cast< QgsSingleSymbolRenderer * >( mExtentLayer->renderer() )->setSymbol( mFrameSymbol->clone() );
297 mExtentLayer->dataProvider()->truncate();
298 mExtentLayer->setCrs( mMap->crs() );
299
300 if ( mInverted )
301 {
302 intersectExtent = thisGeom.difference( intersectExtent );
303 }
304
305 QgsFeature f;
306 f.setGeometry( intersectExtent );
307 mExtentLayer->dataProvider()->addFeature( f );
308
309 return mExtentLayer.get();
310}
311
313{
314 return mExtentLayer.get();
315}
316
318{
319 if ( mFrameSymbol )
320 {
321 QgsStyleSymbolEntity entity( mFrameSymbol.get() );
322 if ( !visitor->visit( QgsStyleEntityVisitorInterface::StyleLeaf( &entity, QStringLiteral( "overview" ), QObject::tr( "Overview" ) ) ) )
323 return false;
324 }
325
326 return true;
327}
328
330{
331 mFrameSymbol.reset( symbol );
332}
333
335{
336 return mFrameSymbol.get();
337}
338
340{
341 return mFrameSymbol.get();
342}
343
344void QgsLayoutItemMapOverview::setBlendMode( const QPainter::CompositionMode blendMode )
345{
346 mBlendMode = blendMode;
347}
348
349void QgsLayoutItemMapOverview::setInverted( const bool inverted )
350{
351 mInverted = inverted;
352}
353
354void QgsLayoutItemMapOverview::setCentered( const bool centered )
355{
356 mCentered = centered;
358}
359
361{
362 if ( !mMap )
363 {
364 return;
365 }
366
367 //if using overview centering, update the map's extent
368 if ( mMap->layout() && mCentered && mFrameMap )
369 {
370 QgsRectangle extent = mMap->extent();
371 QgsRectangle otherExtent = mFrameMap->extent();
372
373 QgsPointXY center = otherExtent.center();
374 QgsRectangle movedExtent( center.x() - extent.width() / 2,
375 center.y() - extent.height() / 2,
376 center.x() - extent.width() / 2 + extent.width(),
377 center.y() - extent.height() / 2 + extent.height() );
378 mMap->setExtent( movedExtent );
379 }
380
381 //repaint map so that overview gets updated
383}
384
385
386//
387// QgsLayoutItemMapOverviewStack
388//
389
395
400
401void QgsLayoutItemMapOverviewStack::removeOverview( const QString &overviewId )
402{
404}
405
406void QgsLayoutItemMapOverviewStack::moveOverviewUp( const QString &overviewId )
407{
409}
410
411void QgsLayoutItemMapOverviewStack::moveOverviewDown( const QString &overviewId )
412{
414}
415
417{
419 return qobject_cast<QgsLayoutItemMapOverview *>( item );
420}
421
423{
425 return qobject_cast<QgsLayoutItemMapOverview *>( item );
426}
427
428QgsLayoutItemMapOverview &QgsLayoutItemMapOverviewStack::operator[]( int idx ) // cppcheck-suppress duplInheritedMember
429{
430 QgsLayoutItemMapItem *item = mItems.at( idx );
431 QgsLayoutItemMapOverview *overview = qobject_cast<QgsLayoutItemMapOverview *>( item );
432 return *overview;
433}
434
435QList<QgsLayoutItemMapOverview *> QgsLayoutItemMapOverviewStack::asList() const // cppcheck-suppress duplInheritedMember
436{
437 QList< QgsLayoutItemMapOverview * > list;
438 QList< QgsLayoutItemMapItem * >::const_iterator it = mItems.begin();
439 for ( ; it != mItems.end(); ++it )
440 {
441 QgsLayoutItemMapOverview *overview = qobject_cast<QgsLayoutItemMapOverview *>( *it );
442 if ( overview )
443 {
444 list.append( overview );
445 }
446 }
447 return list;
448}
449
450bool QgsLayoutItemMapOverviewStack::readXml( const QDomElement &elem, const QDomDocument &doc, const QgsReadWriteContext &context )
451{
452 removeItems();
453
454 //read overview stack
455 QDomNodeList mapOverviewNodeList = elem.elementsByTagName( QStringLiteral( "ComposerMapOverview" ) );
456 for ( int i = 0; i < mapOverviewNodeList.size(); ++i )
457 {
458 QDomElement mapOverviewElem = mapOverviewNodeList.at( i ).toElement();
459 QgsLayoutItemMapOverview *mapOverview = new QgsLayoutItemMapOverview( mapOverviewElem.attribute( QStringLiteral( "name" ) ), mMap );
460 mapOverview->readXml( mapOverviewElem, doc, context );
461 mItems.append( mapOverview );
462 }
463
464 return true;
465}
466
467QList<QgsMapLayer *> QgsLayoutItemMapOverviewStack::modifyMapLayerList( const QList<QgsMapLayer *> &layers )
468{
469 QList<QgsMapLayer *> res = layers;
470 res.reserve( layers.count() + mItems.count() );
471 for ( QgsLayoutItemMapItem *item : std::as_const( mItems ) )
472 {
473 if ( !item )
474 continue;
475
476 QgsVectorLayer *l = static_cast< QgsLayoutItemMapOverview * >( item )->asMapLayer();
477 if ( !l )
478 continue;
479
480 l->setCustomProperty( QStringLiteral( "_noset_layer_expression_context" ), true );
481
482 switch ( item->stackingPosition() )
483 {
485 continue;
486
489 {
490 QgsMapLayer *stackLayer = item->stackingLayer();
491 if ( !stackLayer )
492 continue;
493
494 auto pos = std::find( res.begin(), res.end(), stackLayer );
495 if ( pos == res.end() )
496 continue;
497
499 {
500 pos++;
501 if ( pos == res.end() )
502 {
503 res.push_back( l );
504 break;
505 }
506 }
507 res.insert( pos, l );
508 break;
509 }
510
512 res.push_back( l );
513 break;
514
516 res.push_front( l );
517 break;
518 }
519 }
520
521 return res;
522}
BlendMode
Blending modes defining the available composition modes that can be used when painting.
Definition qgis.h:4639
Contains information about the context in which a coordinate transform is executed.
Class for doing transforms between two map coordinate systems.
Custom exception class for Coordinate Reference System related exceptions.
Expression contexts are used to encapsulate the parameters around which a QgsExpression should be eva...
The feature class encapsulates a single feature including its unique ID, geometry and a list of field...
Definition qgsfeature.h:58
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 geometry is the spatial representation of a feature.
QPolygonF asQPolygonF() const
Returns contents of the geometry as a QPolygonF.
QgsGeometry densifyByCount(int extraNodesPerSegment) const
Returns a copy of the geometry which has been densified by adding the specified number of extra nodes...
QgsGeometry difference(const QgsGeometry &geometry, const QgsGeometryParameters &parameters=QgsGeometryParameters()) const
Returns a geometry representing the points making up this geometry that do not make up other.
static QgsGeometry fromQPolygonF(const QPolygonF &polygon)
Construct geometry from a QPolygonF.
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.
QgsGeometry intersection(const QgsGeometry &geometry, const QgsGeometryParameters &parameters=QgsGeometryParameters()) const
Returns a geometry representing the points shared by this geometry and other.
A collection of map items which are drawn above the map content in a QgsLayoutItemMap.
void addItem(QgsLayoutItemMapItem *item)
Adds a new map item to the stack and takes ownership of the item.
void removeItem(const QString &itemId)
Removes an item which matching itemId from the stack and deletes the corresponding QgsLayoutItemMapIt...
QgsLayoutItemMapItem * item(int index) const
Returns a reference to the item at the specified index within the stack.
void moveItemUp(const QString &itemId)
Moves an item which matching itemId up the stack, causing it to be rendered above other items.
void removeItems()
Clears the item stack and deletes all QgsLayoutItemMapItems contained by the stack.
QList< QgsLayoutItemMapItem * > mItems
void moveItemDown(const QString &itemId)
Moves an item which matching itemId up the stack, causing it to be rendered above other items.
An item which is drawn inside a QgsLayoutItemMap, e.g., a grid or map overview.
@ StackBelowMapLabels
Render above all map layers, but below map labels.
@ StackAboveMapLabels
Render above all map layers and labels.
@ StackBelowMapLayer
Render below a specific map layer (see stackingLayer())
@ StackAboveMapLayer
Render above a specific map layer (see stackingLayer())
@ StackBelowMap
Render below all map layers.
QgsLayoutItemMap * mMap
Associated map.
virtual bool readXml(const QDomElement &element, const QDomDocument &doc, const QgsReadWriteContext &context)
Sets the map item state from a DOM document, where element is the DOM node corresponding to a 'Layout...
virtual bool writeXml(QDomElement &element, QDomDocument &document, const QgsReadWriteContext &context) const
Stores map item state in a DOM element, where element is the DOM element corresponding to a 'LayoutMa...
bool mEnabled
True if item is to be displayed on map.
StackingPosition stackingPosition() const
Returns the item's stacking position, which specifies where the in the map's stack the item should be...
QgsExpressionContext createExpressionContext() const override
This method needs to be reimplemented in all classes which implement this interface and return an exp...
const QgsLayoutItemMap * map() const
Returns the layout item map for the item.
QgsMapLayer * stackingLayer() const
Returns the item's stacking layer, which specifies where the in the map's stack the item should be re...
void moveOverviewUp(const QString &overviewId)
Moves an overview with matching overviewId up the stack, causing it to be rendered above other overvi...
QgsLayoutItemMapOverviewStack(QgsLayoutItemMap *map)
Constructor for QgsLayoutItemMapOverviewStack, attached to the specified map.
QgsLayoutItemMapOverview & operator[](int index)
Returns a reference to an overview at the specified index within the stack.
void addOverview(QgsLayoutItemMapOverview *overview)
Adds a new map overview to the stack and takes ownership of the overview.
bool readXml(const QDomElement &elem, const QDomDocument &doc, const QgsReadWriteContext &context) override
Sets the item stack's state from a DOM document, where element is a DOM node corresponding to a 'Layo...
QList< QgsMapLayer * > modifyMapLayerList(const QList< QgsMapLayer * > &layers)
Alters the list of map layers which will be rendered for the link map item, inserting temporary layer...
void moveOverviewDown(const QString &overviewId)
Moves an overview with matching overviewId down the stack, causing it to be rendered below other over...
void removeOverview(const QString &overviewId)
Removes an overview with matching overviewId from the stack and deletes the corresponding QgsLayoutIt...
QList< QgsLayoutItemMapOverview * > asList() const
Returns a list of QgsLayoutItemMapOverviews contained by the stack.
QgsLayoutItemMapOverview * overview(const QString &overviewId) const
Returns a reference to an overview with matching overviewId within the stack.
An individual overview which is drawn above the map content in a QgsLayoutItemMap,...
QgsFillSymbol * frameSymbol()
Returns the fill symbol used for drawing the overview extent.
QPainter::CompositionMode blendMode() const
Retrieves the blending mode used for drawing the overview.
bool usesAdvancedEffects() const override
Returns true if the item is drawn using advanced effects, such as blend modes.
void connectSignals()
Reconnects signals for overview map, so that overview correctly follows changes to source map's exten...
void setBlendMode(QPainter::CompositionMode mode)
Sets the blending mode used for drawing the overview.
QgsMapLayer * mapLayer() override
Returns the internal map layer used by this item, if available.
QgsVectorLayer * asMapLayer()
Returns a vector layer to render as part of the QgsLayoutItemMap render, containing a feature represe...
void draw(QPainter *painter) override
Draws the item on to a destination painter.
void overviewExtentChanged()
Handles recentering of the map and redrawing of the map's overview.
bool writeXml(QDomElement &elem, QDomDocument &doc, const QgsReadWriteContext &context) const override
Stores map item state in a DOM element, where element is the DOM element corresponding to a 'LayoutMa...
bool centered() const
Returns whether the extent of the map is forced to center on the overview.
~QgsLayoutItemMapOverview() override
void setLinkedMap(QgsLayoutItemMap *map)
Sets the map to show the overview extent of.
void finalizeRestoreFromXml() override
Called after all pending items have been restored from XML.
void setFrameSymbol(QgsFillSymbol *symbol)
Sets the fill symbol used for drawing the overview extent.
bool inverted() const
Returns whether the overview frame is inverted, ie, whether the shaded area is drawn outside the exte...
void setInverted(bool inverted)
Sets whether the overview frame is inverted, ie, whether the shaded area is drawn outside the extent ...
bool accept(QgsStyleEntityVisitorInterface *visitor) const override
Accepts the specified style entity visitor, causing it to visit all style entities associated with th...
QgsLayoutItemMapOverview(const QString &name, QgsLayoutItemMap *map)
Constructor for QgsLayoutItemMapOverview.
bool readXml(const QDomElement &itemElem, const QDomDocument &doc, const QgsReadWriteContext &context) override
Sets the map item state from a DOM document, where element is the DOM node corresponding to a 'Layout...
void setCentered(bool centered)
Sets whether the extent of the map is forced to center on the overview.
QgsLayoutItemMap * linkedMap()
Returns the source map to show the overview extent of.
Layout graphical items for displaying a map.
void extentChanged()
Emitted when the map's extent changes.
void mapRotationChanged(double newRotation)
Emitted when the map's rotation changes.
void setExtent(const QgsRectangle &extent)
Sets a new extent for the map.
QPolygonF visibleExtentPolygon() const
Returns a polygon representing the current visible map extent, considering map extents and rotation.
void invalidateCache() override
QgsRectangle extent() const
Returns the current map extent.
QgsCoordinateReferenceSystem crs() const
Returns coordinate reference system used for rendering the map.
const QgsLayout * layout() const
Returns the layout the object is attached to.
QPointer< QgsLayout > mLayout
static QgsRenderContext createRenderContextForLayout(QgsLayout *layout, QPainter *painter, double dpi=-1)
Creates a render context suitable for the specified layout and painter destination.
Base class for all map layer types.
Definition qgsmaplayer.h:76
Q_INVOKABLE void setCustomProperty(const QString &key, const QVariant &value)
Set a custom property for layer.
static Qgis::BlendMode getBlendModeEnum(QPainter::CompositionMode blendMode)
Returns a Qgis::BlendMode corresponding to a QPainter::CompositionMode.
static QPainter::CompositionMode getCompositionMode(Qgis::BlendMode blendMode)
Returns a QPainter::CompositionMode corresponding to a Qgis::BlendMode.
A class to represent a 2D point.
Definition qgspointxy.h:60
double y
Definition qgspointxy.h:64
double x
Definition qgspointxy.h:63
The class is used as a container of context for various read/write operations on other objects.
A rectangle specified with double values.
QgsPointXY center
Contains information about the context of a rendering operation.
void setForceVectorOutput(bool force)
Sets whether rendering operations should use vector operations instead of any faster raster shortcuts...
void setPainterFlagsUsingContext(QPainter *painter=nullptr) const
Sets relevant flags on a destination painter, using the flags and settings currently defined for the ...
void setExpressionContext(const QgsExpressionContext &context)
Sets the expression context.
Scoped object for saving and restoring a QPainter object's state.
An interface for classes which can visit style entity (e.g.
virtual bool visit(const QgsStyleEntityVisitorInterface::StyleLeaf &entity)
Called when the visitor will visit a style entity.
A symbol entity for QgsStyle databases.
Definition qgsstyle.h:1396
static QDomElement saveSymbol(const QString &symbolName, const QgsSymbol *symbol, QDomDocument &doc, const QgsReadWriteContext &context)
Writes a symbol definition to XML.
Represents a vector layer which manages a vector based data sets.
Contains information relating to the style entity currently being visited.