QgsRenderContext QgsRenderContext::fromMapSettings( const QgsMapSettings &mapSettings )
{
QgsRenderContext ctx;
ctx.setMapToPixel( mapSettings.mapToPixel() );
ctx.setExtent( mapSettings.visibleExtent() );
ctx.setFlag( DrawEditingInfo, mapSettings.testFlag( QgsMapSettings::DrawEditingInfo ) );
ctx.setFlag( ForceVectorOutput, mapSettings.testFlag( QgsMapSettings::ForceVectorOutput ) );
ctx.setFlag( UseAdvancedEffects, mapSettings.testFlag( QgsMapSettings::UseAdvancedEffects ) );
ctx.setFlag( UseRenderingOptimization, mapSettings.testFlag( QgsMapSettings::UseRenderingOptimization ) );
ctx.setCoordinateTransform( QgsCoordinateTransform() );
ctx.setSelectionColor( mapSettings.selectionColor() );
ctx.setFlag( DrawSelection, mapSettings.testFlag( QgsMapSettings::DrawSelection ) );
ctx.setFlag( DrawSymbolBounds, mapSettings.testFlag( QgsMapSettings::DrawSymbolBounds ) );
ctx.setFlag( RenderMapTile, mapSettings.testFlag( QgsMapSettings::RenderMapTile ) );
ctx.setFlag( Antialiasing, mapSettings.testFlag( QgsMapSettings::Antialiasing ) );
ctx.setFlag( RenderPartialOutput, mapSettings.testFlag( QgsMapSettings::RenderPartialOutput ) );
ctx.setScaleFactor( mapSettings.outputDpi() / 25.4 ); // = pixels per mm
ctx.setRendererScale( mapSettings.scale() );
ctx.setExpressionContext( mapSettings.expressionContext() );
ctx.setSegmentationTolerance( mapSettings.segmentationTolerance() );
ctx.setSegmentationToleranceType( mapSettings.segmentationToleranceType() );
ctx.mDistanceArea.setSourceCrs( mapSettings.destinationCrs() );
ctx.mDistanceArea.setEllipsoid( mapSettings.ellipsoid() );
//this flag is only for stopping during the current rendering progress,
//so must be false at every new render operation
ctx.setRenderingStopped( false );
return ctx;
}
QgsRenderContext QgsRenderContext::fromMapSettings( const QgsMapSettings& mapSettings )
{
QgsRenderContext ctx;
ctx.setMapToPixel( mapSettings.mapToPixel() );
ctx.setExtent( mapSettings.visibleExtent() );
ctx.setFlag( DrawEditingInfo, mapSettings.testFlag( QgsMapSettings::DrawEditingInfo ) );
ctx.setFlag( ForceVectorOutput, mapSettings.testFlag( QgsMapSettings::ForceVectorOutput ) );
ctx.setFlag( UseAdvancedEffects, mapSettings.testFlag( QgsMapSettings::UseAdvancedEffects ) );
ctx.setFlag( UseRenderingOptimization, mapSettings.testFlag( QgsMapSettings::UseRenderingOptimization ) );
ctx.setCoordinateTransform( nullptr );
ctx.setSelectionColor( mapSettings.selectionColor() );
ctx.setFlag( DrawSelection, mapSettings.testFlag( QgsMapSettings::DrawSelection ) );
ctx.setFlag( DrawSymbolBounds, mapSettings.testFlag( QgsMapSettings::DrawSymbolBounds ) );
ctx.setFlag( RenderMapTile, mapSettings.testFlag( QgsMapSettings::RenderMapTile ) );
ctx.setRasterScaleFactor( 1.0 );
ctx.setScaleFactor( mapSettings.outputDpi() / 25.4 ); // = pixels per mm
ctx.setRendererScale( mapSettings.scale() );
ctx.setExpressionContext( mapSettings.expressionContext() );
//this flag is only for stopping during the current rendering progress,
//so must be false at every new render operation
ctx.setRenderingStopped( false );
return ctx;
}
QgsRectangle QgsMapCanvas::imageRect( const QImage& img, const QgsMapSettings& mapSettings )
{
// This is a hack to pass QgsMapCanvasItem::setRect what it
// expects (encoding of position and size of the item)
const QgsMapToPixel& m2p = mapSettings.mapToPixel();
QgsPoint topLeft = m2p.toMapPoint( 0, 0 );
double res = m2p.mapUnitsPerPixel();
QgsRectangle rect( topLeft.x(), topLeft.y(), topLeft.x() + img.width()*res, topLeft.y() - img.height()*res );
return rect;
}
int QgsDecorationGrid::yGridLines( const QgsMapSettings &mapSettings, QList< QPair< qreal, QLineF > > &lines ) const
{
// prepare vertical lines
lines.clear();
if ( mGridIntervalX <= 0.0 )
{
return 1;
}
const QgsMapToPixel &m2p = mapSettings.mapToPixel();
// draw nothing if the distance between grid lines would be less than 1px
// otherwise the grid lines would completely cover the whole map
//if ( mapBoundingRect.height() / mGridIntervalY >= p->device()->height() )
if ( mGridIntervalX / mapSettings.mapUnitsPerPixel() < 1 )
return 1;
const QPolygonF &canvasPoly = canvasPolygon( mapSettings );
const QPolygonF &mapPolygon = canvasExtent( mapSettings );
QLineF lineSouth( mapPolygon[3], mapPolygon[2] );
QLineF lineNorth( mapPolygon[0], mapPolygon[1] );
double len = lineSouth.length();
Q_ASSERT( std::fabs( len - lineNorth.length() ) < 1e-6 ); // no shear
const QRectF &mapBoundingRect = mapPolygon.boundingRect();
double roundCorrection = mapBoundingRect.left() > 0 ? 1.0 : 0.0;
double dist = static_cast< int >( ( mapBoundingRect.left() - mGridOffsetX ) / mGridIntervalX + roundCorrection ) * mGridIntervalX + mGridOffsetX;
dist = dist - mapBoundingRect.left();
while ( dist < len )
{
double t = dist / len;
QPointF p0( lineNorth.pointAt( t ) );
QPointF p1( lineSouth.pointAt( t ) );
QLineF line( p0, p1 );
clipByRect( line, canvasPoly );
line = QLineF( m2p.transform( QgsPointXY( line.pointAt( 0 ) ) ).toQPointF(), m2p.transform( QgsPointXY( line.pointAt( 1 ) ) ).toQPointF() );
lines.push_back( qMakePair( p0.x(), line ) );
dist += mGridIntervalX;
}
return 0;
}
static QgsQuickFeatureLayerPair _closestFeature( const QgsQuickFeatureLayerPairs &results, const QgsMapSettings &mapSettings, const QPointF &point )
{
QgsPointXY mapPoint = mapSettings.mapToPixel().toMapCoordinates( point.toPoint() );
QgsGeometry mapPointGeom( QgsGeometry::fromPointXY( mapPoint ) );
double distMin = 1e10;
int iMin = -1;
for ( int i = 0; i < results.count(); ++i )
{
const QgsQuickFeatureLayerPair &res = results.at( i );
QgsGeometry geom( res.feature().geometry() );
try
{
geom.transform( mapSettings.layerTransform( res.layer() ) );
}
catch ( QgsCsException &e )
{
Q_UNUSED( e );
// Caught an error in transform
continue;
}
double dist = geom.distance( mapPointGeom );
if ( dist < distMin )
{
iMin = i;
distMin = dist;
}
}
if ( results.empty() )
{
return QgsQuickFeatureLayerPair();
}
else
{
return results.at( iMin );
}
}
QgsPoint QgsTolerance::toLayerCoordinates( QgsMapLayer* layer, const QgsMapSettings& mapSettings, QPoint point )
{
QgsPoint pt = mapSettings.mapToPixel().toMapCoordinates( point );
return mapSettings.mapToLayerCoordinates( layer, pt );
}
