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Fix extent to determine center point for angle calculation

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This commit is contained in:
Magnus Homann 2012-08-18 01:02:26 +02:00
parent 3d380c6d6d
commit a18e3965b0
1 changed files with 9 additions and 2 deletions
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11
src/app/qgsdecorationnortharrow.cpp
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@ -203,7 +203,15 @@ bool QgsDecorationNorthArrow::calculateNorthDirection()
bool goodDirn = false;
if ( mapCanvas->layerCount() > 0 )
// Get the shown extent...
QgsRectangle canvasExtent = mapCanvas->extent();
// ... and all layers extent, ...
QgsRectangle fullExtent = mapCanvas->fullExtent();
// ... and combine
QgsRectangle extent = canvasExtent.intersect( & fullExtent );
// If no layers are added or shown, we can't get any direction
if ( mapCanvas->layerCount() > 0 && ! extent.isEmpty() )
{
QgsCoordinateReferenceSystem outputCRS = mapCanvas->mapRenderer()->destinationCrs();
@ -216,7 +224,6 @@ bool QgsDecorationNorthArrow::calculateNorthDirection()
QgsCoordinateTransform transform( outputCRS, ourCRS );
QgsRectangle extent = mapCanvas->extent();
QgsPoint p1( extent.center() );
// A point a bit above p1. XXX assumes that y increases up!!
// May need to involve the maptopixel transform if this proves