double QgsTolerance::computeMapUnitPerPixel( QgsMapLayer* layer, const QgsMapSettings& mapSettings )
{
if ( ! mapSettings.hasCrsTransformEnabled() )
{
// if the on-the-fly projections are not enabled, layer units pre pixel are the same as map units per pixel
return mapSettings.mapUnitsPerPixel();
}
// the layer is projected. Find out how many pixels are in one map unit - either horizontal and vertical direction
// this check might not work correctly in some cases
// (on a large area the pixels projected around "0,0" can have different properties from the actual point)
QgsPoint p1 = toLayerCoordinates( layer, mapSettings, QPoint( 0, 1 ) );
QgsPoint p2 = toLayerCoordinates( layer, mapSettings, QPoint( 0, 2 ) );
QgsPoint p3 = toLayerCoordinates( layer, mapSettings, QPoint( 1, 0 ) );
QgsPoint p4 = toLayerCoordinates( layer, mapSettings, QPoint( 2, 0 ) );
double x = p1.sqrDist( p2 );
double y = p3.sqrDist( p4 );
if ( x > y )
{
return sqrt( x );
}
else
{
return sqrt( y );
}
}
void QgsMapRendererJob::drawOldLabeling( const QgsMapSettings& settings, QgsRenderContext& renderContext )
{
// render all labels for vector layers in the stack, starting at the base
QListIterator<QString> li( settings.layers() );
li.toBack();
while ( li.hasPrevious() )
{
if ( renderContext.renderingStopped() )
{
break;
}
QString layerId = li.previous();
QgsMapLayer *ml = QgsMapLayerRegistry::instance()->mapLayer( layerId );
if ( !ml || ( ml->type() != QgsMapLayer::VectorLayer ) )
continue;
// only make labels if the layer is visible
// after scale dep viewing settings are checked
if ( ml->hasScaleBasedVisibility() && ( settings.scale() < ml->minimumScale() || settings.scale() > ml->maximumScale() ) )
continue;
bool split = false;
const QgsCoordinateTransform* ct = 0;
QgsRectangle r1 = settings.visibleExtent(), r2;
if ( settings.hasCrsTransformEnabled() )
{
ct = QgsCoordinateTransformCache::instance()->transform( ml->crs().authid(), settings.destinationCrs().authid() );
split = reprojectToLayerExtent( ct, ml->crs().geographicFlag(), r1, r2 );
}
renderContext.setCoordinateTransform( ct );
renderContext.setExtent( r1 );
ml->drawLabels( renderContext );
if ( split )
{
renderContext.setExtent( r2 );
ml->drawLabels( renderContext );
}
}
}
void QgsMapRendererJob::drawOldLabeling( const QgsMapSettings& settings, QgsRenderContext& renderContext )
{
// render all labels for vector layers in the stack, starting at the base
QListIterator<QString> li( settings.layers() );
li.toBack();
while ( li.hasPrevious() )
{
if ( renderContext.renderingStopped() )
{
break;
}
QString layerId = li.previous();
QgsMapLayer *ml = QgsMapLayerRegistry::instance()->mapLayer( layerId );
if ( !ml || ( ml->type() != QgsMapLayer::VectorLayer ) )
continue;
// only make labels if the layer is visible
// after scale dep viewing settings are checked
if ( !ml->isInScaleRange( settings.scale() ) )
continue;
const QgsCoordinateTransform* ct = nullptr;
QgsRectangle r1 = settings.visibleExtent(), r2;
if ( settings.hasCrsTransformEnabled() )
{
ct = settings.layerTransform( ml );
if ( ct )
reprojectToLayerExtent( ml, ct, r1, r2 );
}
renderContext.setCoordinateTransform( ct );
renderContext.setExtent( r1 );
ml->drawLabels( renderContext );
}
}
void QgsMapCanvas::readProject( const QDomDocument & doc )
{
QDomNodeList nodes = doc.elementsByTagName( "mapcanvas" );
if ( nodes.count() )
{
QDomNode node = nodes.item( 0 );
QgsMapSettings tmpSettings;
tmpSettings.readXML( node );
setMapUnits( tmpSettings.mapUnits() );
setCrsTransformEnabled( tmpSettings.hasCrsTransformEnabled() );
setDestinationCrs( tmpSettings.destinationCrs() );
setExtent( tmpSettings.extent() );
setRotation( tmpSettings.rotation() );
mSettings.datumTransformStore() = tmpSettings.datumTransformStore();
clearExtentHistory(); // clear the extent history on project load
}
else
{
QgsDebugMsg( "Couldn't read mapcanvas information from project" );
}
}
