void QgsMapRenderer::adjustExtentToSize()
{
double myHeight = mSize.height();
double myWidth = mSize.width();
QgsMapToPixel newCoordXForm;
if ( !myWidth || !myHeight )
{
mScale = 1;
newCoordXForm.setParameters( 0, 0, 0, 0 );
return;
}
// calculate the translation and scaling parameters
// mapUnitsPerPixel = map units per pixel
double mapUnitsPerPixelY = mExtent.height() / myHeight;
double mapUnitsPerPixelX = mExtent.width() / myWidth;
mMapUnitsPerPixel = mapUnitsPerPixelY > mapUnitsPerPixelX ? mapUnitsPerPixelY : mapUnitsPerPixelX;
// calculate the actual extent of the mapCanvas
double dxmin, dxmax, dymin, dymax, whitespace;
if ( mapUnitsPerPixelY > mapUnitsPerPixelX )
{
dymin = mExtent.yMinimum();
dymax = mExtent.yMaximum();
whitespace = (( myWidth * mMapUnitsPerPixel ) - mExtent.width() ) * 0.5;
dxmin = mExtent.xMinimum() - whitespace;
dxmax = mExtent.xMaximum() + whitespace;
}
else
{
dxmin = mExtent.xMinimum();
dxmax = mExtent.xMaximum();
whitespace = (( myHeight * mMapUnitsPerPixel ) - mExtent.height() ) * 0.5;
dymin = mExtent.yMinimum() - whitespace;
dymax = mExtent.yMaximum() + whitespace;
}
QgsDebugMsg( QString( "Map units per pixel (x,y) : %1, %2\n" ).arg( mapUnitsPerPixelX ).arg( mapUnitsPerPixelY ) );
QgsDebugMsg( QString( "Pixmap dimensions (x,y) : %1, %2\n" ).arg( myWidth ).arg( myHeight ) );
QgsDebugMsg( QString( "Extent dimensions (x,y) : %1, %2\n" ).arg( mExtent.width() ).arg( mExtent.height() ) );
QgsDebugMsg( mExtent.toString() );
// update extent
mExtent.setXMinimum( dxmin );
mExtent.setXMaximum( dxmax );
mExtent.setYMinimum( dymin );
mExtent.setYMaximum( dymax );
// update the scale
updateScale();
QgsDebugMsg( QString( "Scale (assuming meters as map units) = 1:%1" ).arg( mScale ) );
newCoordXForm.setParameters( mMapUnitsPerPixel, dxmin, dymin, myHeight );
mRenderContext.setMapToPixel( newCoordXForm );
mRenderContext.setExtent( mExtent );
}
QgsLabelPreview::QgsLabelPreview( QWidget* parent )
: QLabel( parent )
{
mTmpLyr = new QgsPalLayerSettings();
// construct a device-based render context
QgsMapToPixel newCoordXForm;
newCoordXForm.setParameters( 0, 0, 0, 0 );
mContext = new QgsRenderContext();
mContext->setMapToPixel( newCoordXForm );
}
void QgsVectorLayerDiagramProvider::drawLabel( QgsRenderContext &context, pal::LabelPosition *label ) const
{
#if 1 // XXX strk
// features are pre-rotated but not scaled/translated,
// so we only disable rotation here. Ideally, they'd be
// also pre-scaled/translated, as suggested here:
// https://issues.qgis.org/issues/11856
QgsMapToPixel xform = context.mapToPixel();
xform.setMapRotation( 0, 0, 0 );
#else
const QgsMapToPixel &xform = context.mapToPixel();
#endif
QgsDiagramLabelFeature *dlf = dynamic_cast<QgsDiagramLabelFeature *>( label->getFeaturePart()->feature() );
QgsFeature feature;
feature.setFields( mFields );
feature.setValid( true );
feature.setId( label->getFeaturePart()->featureId() );
feature.setAttributes( dlf->attributes() );
context.expressionContext().setFeature( feature );
//calculate top-left point for diagram
//first, calculate the centroid of the label (accounts for PAL creating
//rotated labels when we do not want to draw the diagrams rotated)
double centerX = 0;
double centerY = 0;
for ( int i = 0; i < 4; ++i )
{
centerX += label->getX( i );
centerY += label->getY( i );
}
QgsPointXY outPt( centerX / 4.0, centerY / 4.0 );
//then, calculate the top left point for the diagram with this center position
QgsPointXY centerPt = xform.transform( outPt.x() - label->getWidth() / 2,
outPt.y() - label->getHeight() / 2 );
mSettings.renderer()->renderDiagram( feature, context, centerPt.toQPointF(), mSettings.dataDefinedProperties() );
//insert into label search tree to manipulate position interactively
mEngine->results()->mLabelSearchTree->insertLabel( label, label->getFeaturePart()->featureId(), mLayerId, QString(), QFont(), true, false );
}
void QgsMapRenderer::render( QPainter* painter )
{
//flag to see if the render context has changed
//since the last time we rendered. If it hasnt changed we can
//take some shortcuts with rendering
bool mySameAsLastFlag = true;
QgsDebugMsg( "========== Rendering ==========" );
if ( mExtent.isEmpty() )
{
QgsDebugMsg( "empty extent... not rendering" );
return;
}
if ( mSize.width() == 1 && mSize.height() == 1 )
{
QgsDebugMsg( "size 1x1... not rendering" );
return;
}
QPaintDevice* thePaintDevice = painter->device();
if ( !thePaintDevice )
{
return;
}
// wait
if ( mDrawing )
{
QgsDebugMsg( "already rendering" );
QCoreApplication::processEvents();
}
if ( mDrawing )
{
QgsDebugMsg( "still rendering - skipping" );
return;
}
mDrawing = true;
QgsCoordinateTransform* ct;
#ifdef QGISDEBUG
QgsDebugMsg( "Starting to render layer stack." );
QTime renderTime;
renderTime.start();
#endif
if ( mOverview )
mRenderContext.setDrawEditingInformation( !mOverview );
mRenderContext.setPainter( painter );
mRenderContext.setCoordinateTransform( 0 );
//this flag is only for stopping during the current rendering progress,
//so must be false at every new render operation
mRenderContext.setRenderingStopped( false );
//calculate scale factor
//use the specified dpi and not those from the paint device
//because sometimes QPainter units are in a local coord sys (e.g. in case of QGraphicsScene)
double sceneDpi = mScaleCalculator->dpi();
double scaleFactor = 1.0;
if ( mOutputUnits == QgsMapRenderer::Millimeters )
{
scaleFactor = sceneDpi / 25.4;
}
double rasterScaleFactor = ( thePaintDevice->logicalDpiX() + thePaintDevice->logicalDpiY() ) / 2.0 / sceneDpi;
if ( mRenderContext.rasterScaleFactor() != rasterScaleFactor )
{
mRenderContext.setRasterScaleFactor( rasterScaleFactor );
mySameAsLastFlag = false;
}
if ( mRenderContext.scaleFactor() != scaleFactor )
{
mRenderContext.setScaleFactor( scaleFactor );
mySameAsLastFlag = false;
}
if ( mRenderContext.rendererScale() != mScale )
{
//add map scale to render context
mRenderContext.setRendererScale( mScale );
mySameAsLastFlag = false;
}
if ( mLastExtent != mExtent )
{
mLastExtent = mExtent;
mySameAsLastFlag = false;
}
mRenderContext.setLabelingEngine( mLabelingEngine );
if ( mLabelingEngine )
mLabelingEngine->init( this );
// know we know if this render is just a repeat of the last time, we
// can clear caches if it has changed
if ( !mySameAsLastFlag )
{
//clear the cache pixmap if we changed resolution / extent
QSettings mySettings;
if ( mySettings.value( "/qgis/enable_render_caching", false ).toBool() )
{
QgsMapLayerRegistry::instance()->clearAllLayerCaches();
}
}
QgsOverlayObjectPositionManager* overlayManager = overlayManagerFromSettings();
QList<QgsVectorOverlay*> allOverlayList; //list of all overlays, used to draw them after layers have been rendered
// render all layers in the stack, starting at the base
QListIterator<QString> li( mLayerSet );
li.toBack();
QgsRectangle r1, r2;
while ( li.hasPrevious() )
{
if ( mRenderContext.renderingStopped() )
{
break;
}
// Store the painter in case we need to swap it out for the
// cache painter
QPainter * mypContextPainter = mRenderContext.painter();
QString layerId = li.previous();
QgsDebugMsg( "Rendering at layer item " + layerId );
// This call is supposed to cause the progress bar to
// advance. However, it seems that updating the progress bar is
// incompatible with having a QPainter active (the one that is
// passed into this function), as Qt produces a number of errors
// when try to do so. I'm (Gavin) not sure how to fix this, but
// added these comments and debug statement to help others...
QgsDebugMsg( "If there is a QPaintEngine error here, it is caused by an emit call" );
//emit drawingProgress(myRenderCounter++, mLayerSet.size());
QgsMapLayer *ml = QgsMapLayerRegistry::instance()->mapLayer( layerId );
if ( !ml )
{
QgsDebugMsg( "Layer not found in registry!" );
continue;
}
QgsDebugMsg( "Rendering layer " + ml->name() );
QgsDebugMsg( " Layer minscale " + QString( "%1" ).arg( ml->minimumScale() ) );
QgsDebugMsg( " Layer maxscale " + QString( "%1" ).arg( ml->maximumScale() ) );
QgsDebugMsg( " Scale dep. visibility enabled? " + QString( "%1" ).arg( ml->hasScaleBasedVisibility() ) );
QgsDebugMsg( " Input extent: " + ml->extent().toString() );
if ( !ml->hasScaleBasedVisibility() || ( ml->minimumScale() < mScale && mScale < ml->maximumScale() ) || mOverview )
{
connect( ml, SIGNAL( drawingProgress( int, int ) ), this, SLOT( onDrawingProgress( int, int ) ) );
//
// Now do the call to the layer that actually does
// the rendering work!
//
bool split = false;
if ( hasCrsTransformEnabled() )
{
r1 = mExtent;
split = splitLayersExtent( ml, r1, r2 );
ct = new QgsCoordinateTransform( ml->crs(), *mDestCRS );
mRenderContext.setExtent( r1 );
QgsDebugMsg( " extent 1: " + r1.toString() );
QgsDebugMsg( " extent 2: " + r2.toString() );
if ( !r1.isFinite() || !r2.isFinite() ) //there was a problem transforming the extent. Skip the layer
{
continue;
}
}
else
{
ct = NULL;
}
mRenderContext.setCoordinateTransform( ct );
//decide if we have to scale the raster
//this is necessary in case QGraphicsScene is used
bool scaleRaster = false;
QgsMapToPixel rasterMapToPixel;
QgsMapToPixel bk_mapToPixel;
if ( ml->type() == QgsMapLayer::RasterLayer && qAbs( rasterScaleFactor - 1.0 ) > 0.000001 )
{
scaleRaster = true;
}
//create overlay objects for features within the view extent
if ( ml->type() == QgsMapLayer::VectorLayer && overlayManager )
{
QgsVectorLayer* vl = qobject_cast<QgsVectorLayer *>( ml );
if ( vl )
{
QList<QgsVectorOverlay*> thisLayerOverlayList;
vl->vectorOverlays( thisLayerOverlayList );
QList<QgsVectorOverlay*>::iterator overlayIt = thisLayerOverlayList.begin();
for ( ; overlayIt != thisLayerOverlayList.end(); ++overlayIt )
{
if (( *overlayIt )->displayFlag() )
{
( *overlayIt )->createOverlayObjects( mRenderContext );
allOverlayList.push_back( *overlayIt );
}
}
overlayManager->addLayer( vl, thisLayerOverlayList );
}
}
// Force render of layers that are being edited
// or if there's a labeling engine that needs the layer to register features
if ( ml->type() == QgsMapLayer::VectorLayer )
{
QgsVectorLayer* vl = qobject_cast<QgsVectorLayer *>( ml );
if ( vl->isEditable() ||
( mRenderContext.labelingEngine() && mRenderContext.labelingEngine()->willUseLayer( vl ) ) )
{
ml->setCacheImage( 0 );
}
}
QSettings mySettings;
if ( ! split )//render caching does not yet cater for split extents
{
if ( mySettings.value( "/qgis/enable_render_caching", false ).toBool() )
{
if ( !mySameAsLastFlag || ml->cacheImage() == 0 )
{
QgsDebugMsg( "\n\n\nCaching enabled but layer redraw forced by extent change or empty cache\n\n\n" );
QImage * mypImage = new QImage( mRenderContext.painter()->device()->width(),
mRenderContext.painter()->device()->height(), QImage::Format_ARGB32 );
mypImage->fill( 0 );
ml->setCacheImage( mypImage ); //no need to delete the old one, maplayer does it for you
QPainter * mypPainter = new QPainter( ml->cacheImage() );
// Changed to enable anti aliasing by default in QGIS 1.7
if ( mySettings.value( "/qgis/enable_anti_aliasing", true ).toBool() )
{
mypPainter->setRenderHint( QPainter::Antialiasing );
}
mRenderContext.setPainter( mypPainter );
}
else if ( mySameAsLastFlag )
{
//draw from cached image
QgsDebugMsg( "\n\n\nCaching enabled --- drawing layer from cached image\n\n\n" );
mypContextPainter->drawImage( 0, 0, *( ml->cacheImage() ) );
disconnect( ml, SIGNAL( drawingProgress( int, int ) ), this, SLOT( onDrawingProgress( int, int ) ) );
//short circuit as there is nothing else to do...
continue;
}
}
}
if ( scaleRaster )
{
bk_mapToPixel = mRenderContext.mapToPixel();
rasterMapToPixel = mRenderContext.mapToPixel();
rasterMapToPixel.setMapUnitsPerPixel( mRenderContext.mapToPixel().mapUnitsPerPixel() / rasterScaleFactor );
rasterMapToPixel.setYMaximum( mSize.height() * rasterScaleFactor );
mRenderContext.setMapToPixel( rasterMapToPixel );
mRenderContext.painter()->save();
mRenderContext.painter()->scale( 1.0 / rasterScaleFactor, 1.0 / rasterScaleFactor );
}
if ( !ml->draw( mRenderContext ) )
{
emit drawError( ml );
}
else
{
QgsDebugMsg( "Layer rendered without issues" );
}
if ( split )
{
mRenderContext.setExtent( r2 );
if ( !ml->draw( mRenderContext ) )
{
emit drawError( ml );
}
}
if ( scaleRaster )
{
mRenderContext.setMapToPixel( bk_mapToPixel );
mRenderContext.painter()->restore();
}
if ( mySettings.value( "/qgis/enable_render_caching", false ).toBool() )
{
if ( !split )
{
// composite the cached image into our view and then clean up from caching
// by reinstating the painter as it was swapped out for caching renders
delete mRenderContext.painter();
mRenderContext.setPainter( mypContextPainter );
//draw from cached image that we created further up
mypContextPainter->drawImage( 0, 0, *( ml->cacheImage() ) );
}
}
disconnect( ml, SIGNAL( drawingProgress( int, int ) ), this, SLOT( onDrawingProgress( int, int ) ) );
}
else // layer not visible due to scale
{
QgsRasterLayerRenderer::QgsRasterLayerRenderer( QgsRasterLayer* layer, QgsRenderContext& rendererContext )
: QgsMapLayerRenderer( layer->id() )
, mRasterViewPort( nullptr )
, mPipe( nullptr )
{
mPainter = rendererContext.painter();
const QgsMapToPixel& theQgsMapToPixel = rendererContext.mapToPixel();
mMapToPixel = &theQgsMapToPixel;
QgsMapToPixel mapToPixel = theQgsMapToPixel;
if ( mapToPixel.mapRotation() )
{
// unset rotation for the sake of local computations.
// Rotation will be handled by QPainter later
// TODO: provide a method of QgsMapToPixel to fetch map center
// in geographical units
QgsPoint center = mapToPixel.toMapCoordinates(
mapToPixel.mapWidth() / 2.0,
mapToPixel.mapHeight() / 2.0
);
mapToPixel.setMapRotation( 0, center.x(), center.y() );
}
QgsRectangle myProjectedViewExtent;
QgsRectangle myProjectedLayerExtent;
if ( rendererContext.coordinateTransform() )
{
QgsDebugMsg( "coordinateTransform set -> project extents." );
try
{
myProjectedViewExtent = rendererContext.coordinateTransform()->transformBoundingBox( rendererContext.extent() );
}
catch ( QgsCsException &cs )
{
QgsMessageLog::logMessage( QObject::tr( "Could not reproject view extent: %1" ).arg( cs.what() ), QObject::tr( "Raster" ) );
myProjectedViewExtent.setMinimal();
}
try
{
myProjectedLayerExtent = rendererContext.coordinateTransform()->transformBoundingBox( layer->extent() );
}
catch ( QgsCsException &cs )
{
QgsMessageLog::logMessage( QObject::tr( "Could not reproject layer extent: %1" ).arg( cs.what() ), QObject::tr( "Raster" ) );
myProjectedLayerExtent.setMinimal();
}
}
else
{
QgsDebugMsg( "coordinateTransform not set" );
myProjectedViewExtent = rendererContext.extent();
myProjectedLayerExtent = layer->extent();
}
// clip raster extent to view extent
QgsRectangle myRasterExtent = myProjectedViewExtent.intersect( &myProjectedLayerExtent );
if ( myRasterExtent.isEmpty() )
{
QgsDebugMsg( "draw request outside view extent." );
// nothing to do
return;
}
QgsDebugMsg( "theViewExtent is " + rendererContext.extent().toString() );
QgsDebugMsg( "myProjectedViewExtent is " + myProjectedViewExtent.toString() );
QgsDebugMsg( "myProjectedLayerExtent is " + myProjectedLayerExtent.toString() );
QgsDebugMsg( "myRasterExtent is " + myRasterExtent.toString() );
//
// The first thing we do is set up the QgsRasterViewPort. This struct stores all the settings
// relating to the size (in pixels and coordinate system units) of the raster part that is
// in view in the map window. It also stores the origin.
//
//this is not a class level member because every time the user pans or zooms
//the contents of the rasterViewPort will change
mRasterViewPort = new QgsRasterViewPort();
mRasterViewPort->mDrawnExtent = myRasterExtent;
if ( rendererContext.coordinateTransform() )
{
mRasterViewPort->mSrcCRS = layer->crs();
mRasterViewPort->mDestCRS = rendererContext.coordinateTransform()->destCRS();
mRasterViewPort->mSrcDatumTransform = rendererContext.coordinateTransform()->sourceDatumTransform();
mRasterViewPort->mDestDatumTransform = rendererContext.coordinateTransform()->destinationDatumTransform();
}
else
{
mRasterViewPort->mSrcCRS = QgsCoordinateReferenceSystem(); // will be invalid
mRasterViewPort->mDestCRS = QgsCoordinateReferenceSystem(); // will be invalid
mRasterViewPort->mSrcDatumTransform = -1;
mRasterViewPort->mDestDatumTransform = -1;
}
// get dimensions of clipped raster image in device coordinate space (this is the size of the viewport)
mRasterViewPort->mTopLeftPoint = mapToPixel.transform( myRasterExtent.xMinimum(), myRasterExtent.yMaximum() );
mRasterViewPort->mBottomRightPoint = mapToPixel.transform( myRasterExtent.xMaximum(), myRasterExtent.yMinimum() );
// align to output device grid, i.e. floor/ceil to integers
// TODO: this should only be done if paint device is raster - screen, image
// for other devices (pdf) it can have floating point origin
// we could use floating point for raster devices as well, but respecting the
// output device grid should make it more effective as the resampling is done in
// the provider anyway
mRasterViewPort->mTopLeftPoint.setX( floor( mRasterViewPort->mTopLeftPoint.x() ) );
mRasterViewPort->mTopLeftPoint.setY( floor( mRasterViewPort->mTopLeftPoint.y() ) );
mRasterViewPort->mBottomRightPoint.setX( ceil( mRasterViewPort->mBottomRightPoint.x() ) );
mRasterViewPort->mBottomRightPoint.setY( ceil( mRasterViewPort->mBottomRightPoint.y() ) );
// recalc myRasterExtent to aligned values
myRasterExtent.set(
mapToPixel.toMapCoordinatesF( mRasterViewPort->mTopLeftPoint.x(),
mRasterViewPort->mBottomRightPoint.y() ),
mapToPixel.toMapCoordinatesF( mRasterViewPort->mBottomRightPoint.x(),
mRasterViewPort->mTopLeftPoint.y() )
);
//raster viewport top left / bottom right are already rounded to int
mRasterViewPort->mWidth = static_cast<int>( mRasterViewPort->mBottomRightPoint.x() - mRasterViewPort->mTopLeftPoint.x() );
mRasterViewPort->mHeight = static_cast<int>( mRasterViewPort->mBottomRightPoint.y() - mRasterViewPort->mTopLeftPoint.y() );
//the drawable area can start to get very very large when you get down displaying 2x2 or smaller, this is becasue
//mapToPixel.mapUnitsPerPixel() is less then 1,
//so we will just get the pixel data and then render these special cases differently in paintImageToCanvas()
QgsDebugMsgLevel( QString( "mapUnitsPerPixel = %1" ).arg( mapToPixel.mapUnitsPerPixel() ), 3 );
QgsDebugMsgLevel( QString( "mWidth = %1" ).arg( layer->width() ), 3 );
QgsDebugMsgLevel( QString( "mHeight = %1" ).arg( layer->height() ), 3 );
QgsDebugMsgLevel( QString( "myRasterExtent.xMinimum() = %1" ).arg( myRasterExtent.xMinimum() ), 3 );
QgsDebugMsgLevel( QString( "myRasterExtent.xMaximum() = %1" ).arg( myRasterExtent.xMaximum() ), 3 );
QgsDebugMsgLevel( QString( "myRasterExtent.yMinimum() = %1" ).arg( myRasterExtent.yMinimum() ), 3 );
QgsDebugMsgLevel( QString( "myRasterExtent.yMaximum() = %1" ).arg( myRasterExtent.yMaximum() ), 3 );
QgsDebugMsgLevel( QString( "mTopLeftPoint.x() = %1" ).arg( mRasterViewPort->mTopLeftPoint.x() ), 3 );
QgsDebugMsgLevel( QString( "mBottomRightPoint.x() = %1" ).arg( mRasterViewPort->mBottomRightPoint.x() ), 3 );
QgsDebugMsgLevel( QString( "mTopLeftPoint.y() = %1" ).arg( mRasterViewPort->mTopLeftPoint.y() ), 3 );
QgsDebugMsgLevel( QString( "mBottomRightPoint.y() = %1" ).arg( mRasterViewPort->mBottomRightPoint.y() ), 3 );
QgsDebugMsgLevel( QString( "mWidth = %1" ).arg( mRasterViewPort->mWidth ), 3 );
QgsDebugMsgLevel( QString( "mHeight = %1" ).arg( mRasterViewPort->mHeight ), 3 );
// /\/\/\ - added to handle zoomed-in rasters
// TODO R->mLastViewPort = *mRasterViewPort;
// TODO: is it necessary? Probably WMS only?
layer->dataProvider()->setDpi( rendererContext.rasterScaleFactor() * 25.4 * rendererContext.scaleFactor() );
// copy the whole raster pipe!
mPipe = new QgsRasterPipe( *layer->pipe() );
}
QPixmap QgsFontButton::createDragIcon( QSize size, const QgsTextFormat *tempFormat, const QFont *tempFont ) const
{
if ( !tempFormat )
tempFormat = &mFormat;
if ( !tempFont )
tempFont = &mFont;
//create an icon pixmap
QPixmap pixmap( size.width(), size.height() );
pixmap.fill( Qt::transparent );
QPainter p;
p.begin( &pixmap );
p.setRenderHint( QPainter::Antialiasing );
QRect rect( 0, 0, size.width(), size.height() );
if ( mMode == ModeQFont || tempFormat->color().lightnessF() < 0.7 )
{
p.setBrush( QBrush( QColor( 255, 255, 255 ) ) );
p.setPen( QPen( QColor( 150, 150, 150 ), 0 ) );
}
else
{
p.setBrush( QBrush( QColor( 0, 0, 0 ) ) );
p.setPen( QPen( QColor( 100, 100, 100 ), 0 ) );
}
p.drawRect( rect );
p.setBrush( Qt::NoBrush );
p.setPen( Qt::NoPen );
switch ( mMode )
{
case ModeTextRenderer:
{
QgsRenderContext context;
QgsMapToPixel newCoordXForm;
newCoordXForm.setParameters( 1, 0, 0, 0, 0, 0 );
context.setMapToPixel( newCoordXForm );
context.setScaleFactor( QgsApplication::desktop()->logicalDpiX() / 25.4 );
context.setUseAdvancedEffects( true );
context.setPainter( &p );
// slightly inset text to account for buffer/background
double xtrans = 0;
if ( tempFormat->buffer().enabled() )
xtrans = context.convertToPainterUnits( tempFormat->buffer().size(), tempFormat->buffer().sizeUnit(), tempFormat->buffer().sizeMapUnitScale() );
if ( tempFormat->background().enabled() && tempFormat->background().sizeType() != QgsTextBackgroundSettings::SizeFixed )
xtrans = std::max( xtrans, context.convertToPainterUnits( tempFormat->background().size().width(), tempFormat->background().sizeUnit(), tempFormat->background().sizeMapUnitScale() ) );
double ytrans = 0.0;
if ( tempFormat->buffer().enabled() )
ytrans = std::max( ytrans, context.convertToPainterUnits( tempFormat->buffer().size(), tempFormat->buffer().sizeUnit(), tempFormat->buffer().sizeMapUnitScale() ) );
if ( tempFormat->background().enabled() )
ytrans = std::max( ytrans, context.convertToPainterUnits( tempFormat->background().size().height(), tempFormat->background().sizeUnit(), tempFormat->background().sizeMapUnitScale() ) );
QRectF textRect = rect;
textRect.setLeft( xtrans );
textRect.setWidth( textRect.width() - xtrans );
textRect.setTop( ytrans );
if ( textRect.height() > 300 )
textRect.setHeight( 300 );
if ( textRect.width() > 2000 )
textRect.setWidth( 2000 );
QgsTextRenderer::drawText( textRect, 0, QgsTextRenderer::AlignCenter, QStringList() << tr( "Aa" ),
context, *tempFormat );
break;
}
case ModeQFont:
{
p.setBrush( Qt::NoBrush );
p.setPen( QColor( 0, 0, 0 ) );
p.setFont( *tempFont );
QRectF textRect = rect;
textRect.setLeft( 2 );
p.drawText( textRect, Qt::AlignVCenter, tr( "Aa" ) );
break;
}
}
p.end();
return pixmap;
}
void QgsMapRenderer::render( QPainter* painter, double* forceWidthScale )
{
//Lock render method for concurrent threads (e.g. from globe)
QMutexLocker renderLock( &mRenderMutex );
QgsDebugMsg( "========== Rendering ==========" );
if ( mExtent.isEmpty() )
{
QgsDebugMsg( "empty extent... not rendering" );
return;
}
if ( mSize.width() == 1 && mSize.height() == 1 )
{
QgsDebugMsg( "size 1x1... not rendering" );
return;
}
QPaintDevice* thePaintDevice = painter->device();
if ( !thePaintDevice )
{
return;
}
// wait
if ( mDrawing )
{
QgsDebugMsg( "already rendering" );
QCoreApplication::processEvents();
}
if ( mDrawing )
{
QgsDebugMsg( "still rendering - skipping" );
return;
}
mDrawing = true;
const QgsCoordinateTransform *ct;
#ifdef QGISDEBUG
QgsDebugMsg( "Starting to render layer stack." );
QTime renderTime;
renderTime.start();
#endif
if ( mOverview )
mRenderContext.setDrawEditingInformation( !mOverview );
mRenderContext.setPainter( painter );
mRenderContext.setCoordinateTransform( 0 );
//this flag is only for stopping during the current rendering progress,
//so must be false at every new render operation
mRenderContext.setRenderingStopped( false );
// set selection color
QgsProject* prj = QgsProject::instance();
int myRed = prj->readNumEntry( "Gui", "/SelectionColorRedPart", 255 );
int myGreen = prj->readNumEntry( "Gui", "/SelectionColorGreenPart", 255 );
int myBlue = prj->readNumEntry( "Gui", "/SelectionColorBluePart", 0 );
int myAlpha = prj->readNumEntry( "Gui", "/SelectionColorAlphaPart", 255 );
mRenderContext.setSelectionColor( QColor( myRed, myGreen, myBlue, myAlpha ) );
//calculate scale factor
//use the specified dpi and not those from the paint device
//because sometimes QPainter units are in a local coord sys (e.g. in case of QGraphicsScene)
double sceneDpi = mScaleCalculator->dpi();
double scaleFactor = 1.0;
if ( mOutputUnits == QgsMapRenderer::Millimeters )
{
if ( forceWidthScale )
{
scaleFactor = *forceWidthScale;
}
else
{
scaleFactor = sceneDpi / 25.4;
}
}
double rasterScaleFactor = ( thePaintDevice->logicalDpiX() + thePaintDevice->logicalDpiY() ) / 2.0 / sceneDpi;
if ( mRenderContext.rasterScaleFactor() != rasterScaleFactor )
{
mRenderContext.setRasterScaleFactor( rasterScaleFactor );
}
if ( mRenderContext.scaleFactor() != scaleFactor )
{
mRenderContext.setScaleFactor( scaleFactor );
}
if ( mRenderContext.rendererScale() != mScale )
{
//add map scale to render context
mRenderContext.setRendererScale( mScale );
}
if ( mLastExtent != mExtent )
{
mLastExtent = mExtent;
}
mRenderContext.setLabelingEngine( mLabelingEngine );
if ( mLabelingEngine )
mLabelingEngine->init( mapSettings() );
// render all layers in the stack, starting at the base
QListIterator<QString> li( mLayerSet );
li.toBack();
QgsRectangle r1, r2;
while ( li.hasPrevious() )
{
if ( mRenderContext.renderingStopped() )
{
break;
}
// Store the painter in case we need to swap it out for the
// cache painter
QPainter * mypContextPainter = mRenderContext.painter();
// Flattened image for drawing when a blending mode is set
QImage * mypFlattenedImage = 0;
QString layerId = li.previous();
QgsDebugMsg( "Rendering at layer item " + layerId );
// This call is supposed to cause the progress bar to
// advance. However, it seems that updating the progress bar is
// incompatible with having a QPainter active (the one that is
// passed into this function), as Qt produces a number of errors
// when try to do so. I'm (Gavin) not sure how to fix this, but
// added these comments and debug statement to help others...
QgsDebugMsg( "If there is a QPaintEngine error here, it is caused by an emit call" );
//emit drawingProgress(myRenderCounter++, mLayerSet.size());
QgsMapLayer *ml = QgsMapLayerRegistry::instance()->mapLayer( layerId );
if ( !ml )
{
QgsDebugMsg( "Layer not found in registry!" );
continue;
}
QgsDebugMsg( QString( "layer %1: minscale:%2 maxscale:%3 scaledepvis:%4 extent:%5 blendmode:%6" )
.arg( ml->name() )
.arg( ml->minimumScale() )
.arg( ml->maximumScale() )
.arg( ml->hasScaleBasedVisibility() )
.arg( ml->extent().toString() )
.arg( ml->blendMode() )
);
if ( mRenderContext.useAdvancedEffects() )
{
// Set the QPainter composition mode so that this layer is rendered using
// the desired blending mode
mypContextPainter->setCompositionMode( ml->blendMode() );
}
if ( !ml->hasScaleBasedVisibility() || ( ml->minimumScale() <= mScale && mScale < ml->maximumScale() ) || mOverview )
{
connect( ml, SIGNAL( drawingProgress( int, int ) ), this, SLOT( onDrawingProgress( int, int ) ) );
//
// Now do the call to the layer that actually does
// the rendering work!
//
bool split = false;
if ( hasCrsTransformEnabled() )
{
r1 = mExtent;
split = splitLayersExtent( ml, r1, r2 );
ct = transformation( ml );
mRenderContext.setExtent( r1 );
QgsDebugMsg( " extent 1: " + r1.toString() );
QgsDebugMsg( " extent 2: " + r2.toString() );
if ( !r1.isFinite() || !r2.isFinite() ) //there was a problem transforming the extent. Skip the layer
{
continue;
}
}
else
{
ct = NULL;
}
mRenderContext.setCoordinateTransform( ct );
//decide if we have to scale the raster
//this is necessary in case QGraphicsScene is used
bool scaleRaster = false;
QgsMapToPixel rasterMapToPixel;
QgsMapToPixel bk_mapToPixel;
if ( ml->type() == QgsMapLayer::RasterLayer && qAbs( rasterScaleFactor - 1.0 ) > 0.000001 )
{
scaleRaster = true;
}
QSettings mySettings;
// If we are drawing with an alternative blending mode then we need to render to a separate image
// before compositing this on the map. This effectively flattens the layer and prevents
// blending occuring between objects on the layer
// (this is not required for raster layers or when layer caching is enabled, since that has the same effect)
bool flattenedLayer = false;
if (( mRenderContext.useAdvancedEffects() ) && ( ml->type() == QgsMapLayer::VectorLayer ) )
{
QgsVectorLayer* vl = qobject_cast<QgsVectorLayer *>( ml );
if ((( vl->blendMode() != QPainter::CompositionMode_SourceOver )
|| ( vl->featureBlendMode() != QPainter::CompositionMode_SourceOver )
|| ( vl->layerTransparency() != 0 ) ) )
{
flattenedLayer = true;
mypFlattenedImage = new QImage( mRenderContext.painter()->device()->width(),
mRenderContext.painter()->device()->height(), QImage::Format_ARGB32 );
if ( mypFlattenedImage->isNull() )
{
QgsDebugMsg( "insufficient memory for image " + QString::number( mRenderContext.painter()->device()->width() ) + "x" + QString::number( mRenderContext.painter()->device()->height() ) );
emit drawError( ml );
painter->end(); // drawError is not caught by anyone, so we end painting to notify caller
return;
}
mypFlattenedImage->fill( 0 );
QPainter * mypPainter = new QPainter( mypFlattenedImage );
if ( mySettings.value( "/qgis/enable_anti_aliasing", true ).toBool() )
{
mypPainter->setRenderHint( QPainter::Antialiasing );
}
mypPainter->scale( rasterScaleFactor, rasterScaleFactor );
mRenderContext.setPainter( mypPainter );
}
}
// Per feature blending mode
if (( mRenderContext.useAdvancedEffects() ) && ( ml->type() == QgsMapLayer::VectorLayer ) )
{
QgsVectorLayer* vl = qobject_cast<QgsVectorLayer *>( ml );
if ( vl->featureBlendMode() != QPainter::CompositionMode_SourceOver )
{
// set the painter to the feature blend mode, so that features drawn
// on this layer will interact and blend with each other
mRenderContext.painter()->setCompositionMode( vl->featureBlendMode() );
}
}
if ( scaleRaster )
{
bk_mapToPixel = mRenderContext.mapToPixel();
rasterMapToPixel = mRenderContext.mapToPixel();
rasterMapToPixel.setMapUnitsPerPixel( mRenderContext.mapToPixel().mapUnitsPerPixel() / rasterScaleFactor );
rasterMapToPixel.setYMaximum( mSize.height() * rasterScaleFactor );
mRenderContext.setMapToPixel( rasterMapToPixel );
mRenderContext.painter()->save();
mRenderContext.painter()->scale( 1.0 / rasterScaleFactor, 1.0 / rasterScaleFactor );
}
if ( !ml->draw( mRenderContext ) )
{
emit drawError( ml );
}
else
{
QgsDebugMsg( "Layer rendered without issues" );
}
if ( split )
{
mRenderContext.setExtent( r2 );
if ( !ml->draw( mRenderContext ) )
{
emit drawError( ml );
}
}
if ( scaleRaster )
{
mRenderContext.setMapToPixel( bk_mapToPixel );
mRenderContext.painter()->restore();
}
//apply layer transparency for vector layers
if (( mRenderContext.useAdvancedEffects() ) && ( ml->type() == QgsMapLayer::VectorLayer ) )
{
QgsVectorLayer* vl = qobject_cast<QgsVectorLayer *>( ml );
if ( vl->layerTransparency() != 0 )
{
// a layer transparency has been set, so update the alpha for the flattened layer
// by combining it with the layer transparency
QColor transparentFillColor = QColor( 0, 0, 0, 255 - ( 255 * vl->layerTransparency() / 100 ) );
// use destination in composition mode to merge source's alpha with destination
mRenderContext.painter()->setCompositionMode( QPainter::CompositionMode_DestinationIn );
mRenderContext.painter()->fillRect( 0, 0, mRenderContext.painter()->device()->width(),
mRenderContext.painter()->device()->height(), transparentFillColor );
}
}
if ( flattenedLayer )
{
// If we flattened this layer for alternate blend modes, composite it now
delete mRenderContext.painter();
mRenderContext.setPainter( mypContextPainter );
mypContextPainter->save();
mypContextPainter->scale( 1.0 / rasterScaleFactor, 1.0 / rasterScaleFactor );
mypContextPainter->drawImage( 0, 0, *( mypFlattenedImage ) );
mypContextPainter->restore();
delete mypFlattenedImage;
mypFlattenedImage = 0;
}
disconnect( ml, SIGNAL( drawingProgress( int, int ) ), this, SLOT( onDrawingProgress( int, int ) ) );
}
else // layer not visible due to scale
{
