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qgsmaprenderer.cpp
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qgsmaprenderer.cpp
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/***************************************************************************
qgsmaprender.cpp - class for rendering map layer set
----------------------
begin : January 2006
copyright : (C) 2006 by Martin Dobias
email : wonder.sk at gmail dot com
***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include <cmath>
#include <cfloat>
#include "qgscoordinatetransform.h"
#include "qgscrscache.h"
#include "qgslogger.h"
#include "qgsmessagelog.h"
#include "qgsmaprenderer.h"
#include "qgsscalecalculator.h"
#include "qgsmaptopixel.h"
#include "qgsmaplayer.h"
#include "qgsmaplayerregistry.h"
#include "qgsdistancearea.h"
#include "qgsproject.h"
#include "qgsvectorlayer.h"
#include <QDomDocument>
#include <QDomNode>
#include <QMutexLocker>
#include <QPainter>
#include <QListIterator>
#include <QSettings>
#include <QTime>
#include <QCoreApplication>
QgsMapRenderer::QgsMapRenderer()
{
mScale = 1.0;
mScaleCalculator = new QgsScaleCalculator;
mDistArea = new QgsDistanceArea;
mDrawing = false;
mOverview = false;
// set default map units - we use WGS 84 thus use degrees
setMapUnits( QGis::Degrees );
mSize = QSize( 0, 0 );
mProjectionsEnabled = false;
mDestCRS = new QgsCoordinateReferenceSystem( GEOCRS_ID, QgsCoordinateReferenceSystem::InternalCrsId ); //WGS 84
mOutputUnits = QgsMapRenderer::Millimeters;
mLabelingEngine = NULL;
}
QgsMapRenderer::~QgsMapRenderer()
{
delete mScaleCalculator;
delete mDistArea;
delete mDestCRS;
delete mLabelingEngine;
}
QgsRectangle QgsMapRenderer::extent() const
{
return mExtent;
}
void QgsMapRenderer::updateScale()
{
mScale = mScaleCalculator->calculate( mExtent, mSize.width() );
}
bool QgsMapRenderer::setExtent( const QgsRectangle& extent )
{
//remember the previous extent
mLastExtent = mExtent;
// Don't allow zooms where the current extent is so small that it
// can't be accurately represented using a double (which is what
// currentExtent uses). Excluding 0 avoids a divide by zero and an
// infinite loop when rendering to a new canvas. Excluding extents
// greater than 1 avoids doing unnecessary calculations.
// The scheme is to compare the width against the mean x coordinate
// (and height against mean y coordinate) and only allow zooms where
// the ratio indicates that there is more than about 12 significant
// figures (there are about 16 significant figures in a double).
if ( extent.width() > 0 &&
extent.height() > 0 &&
extent.width() < 1 &&
extent.height() < 1 )
{
// Use abs() on the extent to avoid the case where the extent is
// symmetrical about 0.
double xMean = ( qAbs( extent.xMinimum() ) + qAbs( extent.xMaximum() ) ) * 0.5;
double yMean = ( qAbs( extent.yMinimum() ) + qAbs( extent.yMaximum() ) ) * 0.5;
double xRange = extent.width() / xMean;
double yRange = extent.height() / yMean;
static const double minProportion = 1e-12;
if ( xRange < minProportion || yRange < minProportion )
return false;
}
mExtent = extent;
if ( !extent.isEmpty() )
adjustExtentToSize();
return true;
}
void QgsMapRenderer::setOutputSize( QSize size, int dpi )
{
mSize = QSizeF( size.width(), size.height() );
mScaleCalculator->setDpi( dpi );
adjustExtentToSize();
}
void QgsMapRenderer::setOutputSize( QSizeF size, double dpi )
{
mSize = size;
mScaleCalculator->setDpi( dpi );
adjustExtentToSize();
}
double QgsMapRenderer::outputDpi()
{
return mScaleCalculator->dpi();
}
QSize QgsMapRenderer::outputSize()
{
return mSize.toSize();
}
QSizeF QgsMapRenderer::outputSizeF()
{
return mSize;
}
void QgsMapRenderer::adjustExtentToSize()
{
double myHeight = mSize.height();
double myWidth = mSize.width();
QgsMapToPixel newCoordXForm;
if ( !myWidth || !myHeight )
{
mScale = 1.0;
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" ).arg( qgsDoubleToString( mapUnitsPerPixelX ) ).arg( qgsDoubleToString( mapUnitsPerPixelY ) ) );
QgsDebugMsg( QString( "Pixmap dimensions (x,y) : %1, %2" ).arg( qgsDoubleToString( myWidth ) ).arg( qgsDoubleToString( myHeight ) ) );
QgsDebugMsg( QString( "Extent dimensions (x,y) : %1, %2" ).arg( qgsDoubleToString( mExtent.width() ) ).arg( qgsDoubleToString( mExtent.height() ) ) );
QgsDebugMsg( mExtent.toString() );
// update extent
mExtent.setXMinimum( dxmin );
mExtent.setXMaximum( dxmax );
mExtent.setYMinimum( dymin );
mExtent.setYMaximum( dymax );
QgsDebugMsg( QString( "Adjusted map units per pixel (x,y) : %1, %2" ).arg( qgsDoubleToString( mExtent.width() / myWidth ) ).arg( qgsDoubleToString( mExtent.height() / myHeight ) ) );
QgsDebugMsg( QString( "Recalced pixmap dimensions (x,y) : %1, %2" ).arg( qgsDoubleToString( mExtent.width() / mMapUnitsPerPixel ) ).arg( qgsDoubleToString( mExtent.height() / mMapUnitsPerPixel ) ) );
// update the scale
updateScale();
QgsDebugMsg( QString( "Scale (assuming meters as map units) = 1:%1" ).arg( qgsDoubleToString( mScale ) ) );
newCoordXForm.setParameters( mMapUnitsPerPixel, dxmin, dymin, myHeight );
mRenderContext.setMapToPixel( newCoordXForm );
mRenderContext.setExtent( mExtent );
}
void QgsMapRenderer::render( QPainter* painter, double* forceWidthScale )
{
//Lock render method for concurrent threads (e.g. from globe)
QMutexLocker renderLock( &mRenderMutex );
//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;
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 );
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();
}
}
// 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 = tr( 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;
}
// 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;
bool useRenderCaching = false;
if ( ! split )//render caching does not yet cater for split extents
{
if ( mySettings.value( "/qgis/enable_render_caching", false ).toBool() )
{
useRenderCaching = true;
if ( !mySameAsLastFlag || ml->cacheImage() == 0 )
{
QgsDebugMsg( "Caching enabled but layer redraw forced by extent change or empty cache" );
QImage * mypImage = new QImage( mRenderContext.painter()->device()->width(),
mRenderContext.painter()->device()->height(), QImage::Format_ARGB32 );
if ( mypImage->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;
}
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( "Caching enabled --- drawing layer from cached image" );
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 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 (( !useRenderCaching )
&& (( 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 ( useRenderCaching )
{
// 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
if ( ml->cacheImage() )
mypContextPainter->drawImage( 0, 0, *( ml->cacheImage() ) );
}
else 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
{
QgsDebugMsg( "Layer not rendered because it is not within the defined "
"visibility scale range" );
}
} // while (li.hasPrevious())
QgsDebugMsg( "Done rendering map layers" );
// Reset the composition mode before rendering the labels
mRenderContext.painter()->setCompositionMode( QPainter::CompositionMode_SourceOver );
if ( !mOverview )
{
// render all labels for vector layers in the stack, starting at the base
li.toBack();
while ( li.hasPrevious() )
{
if ( mRenderContext.renderingStopped() )
{
break;
}
QString layerId = li.previous();
// TODO: emit drawingProgress((myRenderCounter++),zOrder.size());
QgsMapLayer *ml = QgsMapLayerRegistry::instance()->mapLayer( layerId );
if ( ml && ( ml->type() != QgsMapLayer::RasterLayer ) )
{
// only make labels if the layer is visible
// after scale dep viewing settings are checked
if ( !ml->hasScaleBasedVisibility() || ( ml->minimumScale() < mScale && mScale < ml->maximumScale() ) )
{
bool split = false;
if ( hasCrsTransformEnabled() )
{
QgsRectangle r1 = mExtent;
split = splitLayersExtent( ml, r1, r2 );
ct = tr( ml );
mRenderContext.setExtent( r1 );
}
else
{
ct = NULL;
}
mRenderContext.setCoordinateTransform( ct );
ml->drawLabels( mRenderContext );
if ( split )
{
mRenderContext.setExtent( r2 );
ml->drawLabels( mRenderContext );
}
}
}
}
} // if (!mOverview)
// make sure progress bar arrives at 100%!
emit drawingProgress( 1, 1 );
if ( mLabelingEngine )
{
// set correct extent
mRenderContext.setExtent( mExtent );
mRenderContext.setCoordinateTransform( NULL );
mLabelingEngine->drawLabeling( mRenderContext );
mLabelingEngine->exit();
}
QgsDebugMsg( "Rendering completed in (seconds): " + QString( "%1" ).arg( renderTime.elapsed() / 1000.0 ) );
mDrawing = false;
}
void QgsMapRenderer::setMapUnits( QGis::UnitType u )
{
mScaleCalculator->setMapUnits( u );
// Since the map units have changed, force a recalculation of the scale.
updateScale();
emit mapUnitsChanged();
}
QGis::UnitType QgsMapRenderer::mapUnits() const
{
return mScaleCalculator->mapUnits();
}
void QgsMapRenderer::onDrawingProgress( int current, int total )
{
Q_UNUSED( current );
Q_UNUSED( total );
// TODO: emit signal with progress
// QgsDebugMsg(QString("onDrawingProgress: %1 / %2").arg(current).arg(total));
emit updateMap();
}
void QgsMapRenderer::setProjectionsEnabled( bool enabled )
{
if ( mProjectionsEnabled != enabled )
{
mProjectionsEnabled = enabled;
QgsDebugMsg( "Adjusting DistArea projection on/off" );
mDistArea->setEllipsoidalMode( enabled );
updateFullExtent();
mLastExtent.setMinimal();
emit hasCrsTransformEnabled( enabled );
}
}
bool QgsMapRenderer::hasCrsTransformEnabled() const
{
return mProjectionsEnabled;
}
void QgsMapRenderer::setDestinationCrs( const QgsCoordinateReferenceSystem& crs, bool refreshCoordinateTransformInfo )
{
QgsDebugMsg( "* Setting destCRS : = " + crs.toProj4() );
QgsDebugMsg( "* DestCRS.srsid() = " + QString::number( crs.srsid() ) );
if ( *mDestCRS != crs )
{
if ( refreshCoordinateTransformInfo )
{
mLayerCoordinateTransformInfo.clear();
}
QgsRectangle rect;
if ( !mExtent.isEmpty() )
{
QgsCoordinateTransform transform( *mDestCRS, crs );
rect = transform.transformBoundingBox( mExtent );
}
QgsDebugMsg( "Setting DistArea CRS to " + QString::number( crs.srsid() ) );
mDistArea->setSourceCrs( crs.srsid() );
*mDestCRS = crs;
updateFullExtent();
if ( !rect.isEmpty() )
{
setExtent( rect );
}
emit destinationSrsChanged();
}
}
const QgsCoordinateReferenceSystem& QgsMapRenderer::destinationCrs() const
{
QgsDebugMsgLevel( "* Returning destCRS", 3 );
QgsDebugMsgLevel( "* DestCRS.srsid() = " + QString::number( mDestCRS->srsid() ), 3 );
QgsDebugMsgLevel( "* DestCRS.proj4() = " + mDestCRS->toProj4(), 3 );
return *mDestCRS;
}
bool QgsMapRenderer::splitLayersExtent( QgsMapLayer* layer, QgsRectangle& extent, QgsRectangle& r2 )
{
bool split = false;
if ( hasCrsTransformEnabled() )
{
try
{
#ifdef QGISDEBUG
// QgsLogger::debug<QgsRectangle>("Getting extent of canvas in layers CS. Canvas is ", extent, __FILE__, __FUNCTION__, __LINE__);
#endif
// Split the extent into two if the source CRS is
// geographic and the extent crosses the split in
// geographic coordinates (usually +/- 180 degrees,
// and is assumed to be so here), and draw each
// extent separately.
static const double splitCoord = 180.0;
const QgsCoordinateTransform* transform = tr( layer );
if ( layer->crs().geographicFlag() )
{
// Note: ll = lower left point
// and ur = upper right point
QgsPoint ll( extent.xMinimum(), extent.yMinimum() );
QgsPoint ur( extent.xMaximum(), extent.yMaximum() );
if ( transform )
{
ll = transform->transform( ll.x(), ll.y(),
QgsCoordinateTransform::ReverseTransform );
ur = transform->transform( ur.x(), ur.y(),
QgsCoordinateTransform::ReverseTransform );
extent = transform->transformBoundingBox( extent, QgsCoordinateTransform::ReverseTransform );
}
if ( ll.x() > ur.x() )
{
r2 = extent;
extent.setXMinimum( splitCoord );
r2.setXMaximum( splitCoord );
split = true;
}
}
else // can't cross 180
{
if ( transform )
{
extent = transform->transformBoundingBox( extent, QgsCoordinateTransform::ReverseTransform );
}
}
}
catch ( QgsCsException &cse )
{
Q_UNUSED( cse );
QgsDebugMsg( "Transform error caught" );
extent = QgsRectangle( -DBL_MAX, -DBL_MAX, DBL_MAX, DBL_MAX );
r2 = QgsRectangle( -DBL_MAX, -DBL_MAX, DBL_MAX, DBL_MAX );
}
}
return split;
}
QgsRectangle QgsMapRenderer::layerExtentToOutputExtent( QgsMapLayer* theLayer, QgsRectangle extent )
{
//QgsDebugMsg( QString( "sourceCrs = " + tr( theLayer )->sourceCrs().authid() ) );
//QgsDebugMsg( QString( "destCRS = " + tr( theLayer )->destCRS().authid() ) );
//QgsDebugMsg( QString( "extent = " + extent.toString() ) );
if ( hasCrsTransformEnabled() )
{
try
{
const QgsCoordinateTransform* transform = tr( theLayer );
if ( transform )
{
extent = transform->transformBoundingBox( extent );
}
}
catch ( QgsCsException &cse )
{
QgsMessageLog::logMessage( tr( "Transform error caught: %1" ).arg( cse.what() ), tr( "CRS" ) );
}
}
QgsDebugMsg( QString( "proj extent = " + extent.toString() ) );
return extent;
}
QgsRectangle QgsMapRenderer::outputExtentToLayerExtent( QgsMapLayer* theLayer, QgsRectangle extent )
{
QgsDebugMsg( QString( "layer sourceCrs = " + tr( theLayer )->sourceCrs().authid() ) );
QgsDebugMsg( QString( "layer destCRS = " + tr( theLayer )->destCRS().authid() ) );
QgsDebugMsg( QString( "extent = " + extent.toString() ) );
if ( hasCrsTransformEnabled() )
{
try
{
extent = tr( theLayer )->transformBoundingBox( extent, QgsCoordinateTransform::ReverseTransform );
}
catch ( QgsCsException &cse )
{
QgsMessageLog::logMessage( tr( "Transform error caught: %1" ).arg( cse.what() ), tr( "CRS" ) );
}
}
QgsDebugMsg( QString( "proj extent = " + extent.toString() ) );
return extent;
}
QgsPoint QgsMapRenderer::layerToMapCoordinates( QgsMapLayer* theLayer, QgsPoint point )
{
if ( hasCrsTransformEnabled() )
{
try
{
point = tr( theLayer )->transform( point, QgsCoordinateTransform::ForwardTransform );
}
catch ( QgsCsException &cse )
{
QgsMessageLog::logMessage( QString( "Transform error caught: %1" ).arg( cse.what() ) );
}
}
else
{
// leave point without transformation
}
return point;
}
QgsRectangle QgsMapRenderer::layerToMapCoordinates( QgsMapLayer* theLayer, QgsRectangle rect )
{
if ( hasCrsTransformEnabled() )
{
try
{
rect = tr( theLayer )->transform( rect, QgsCoordinateTransform::ForwardTransform );
}
catch ( QgsCsException &cse )
{
QgsMessageLog::logMessage( QString( "Transform error caught: %1" ).arg( cse.what() ) );
}
}
else
{
// leave point without transformation
}
return rect;
}
QgsPoint QgsMapRenderer::mapToLayerCoordinates( QgsMapLayer* theLayer, QgsPoint point )
{
if ( hasCrsTransformEnabled() )
{
try
{
point = tr( theLayer )->transform( point, QgsCoordinateTransform::ReverseTransform );
}
catch ( QgsCsException &cse )
{
QgsMessageLog::logMessage( QString( "Transform error caught: %1" ).arg( cse.what() ) );
}
}
else
{
// leave point without transformation
}
return point;
}
QgsRectangle QgsMapRenderer::mapToLayerCoordinates( QgsMapLayer* theLayer, QgsRectangle rect )
{
if ( hasCrsTransformEnabled() )
{
try
{
rect = tr( theLayer )->transform( rect, QgsCoordinateTransform::ReverseTransform );
}
catch ( QgsCsException &cse )
{
QgsMessageLog::logMessage( QString( "Transform error caught: %1" ).arg( cse.what() ) );
}
}
return rect;
}
void QgsMapRenderer::updateFullExtent()
{
QgsDebugMsg( "called." );
QgsMapLayerRegistry* registry = QgsMapLayerRegistry::instance();
// reset the map canvas extent since the extent may now be smaller
// We can't use a constructor since QgsRectangle normalizes the rectangle upon construction
mFullExtent.setMinimal();
// iterate through the map layers and test each layers extent
// against the current min and max values
QStringList::iterator it = mLayerSet.begin();
QgsDebugMsg( QString( "Layer count: %1" ).arg( mLayerSet.count() ) );
while ( it != mLayerSet.end() )
{
QgsMapLayer * lyr = registry->mapLayer( *it );
if ( lyr == NULL )
{
QgsDebugMsg( QString( "WARNING: layer '%1' not found in map layer registry!" ).arg( *it ) );
}
else
{
QgsDebugMsg( "Updating extent using " + lyr->name() );
QgsDebugMsg( "Input extent: " + lyr->extent().toString() );
if ( lyr->extent().isEmpty() )
{
it++;
continue;
}
// Layer extents are stored in the coordinate system (CS) of the
// layer. The extent must be projected to the canvas CS
QgsRectangle extent = layerExtentToOutputExtent( lyr, lyr->extent() );