bool QgsMapToolIdentify::identifyRasterLayer( QgsRasterLayer *layer, int x, int y )
{
bool res = true;
if ( !layer )
return false;
QgsRasterDataProvider *dprovider = layer->dataProvider();
if ( dprovider && ( dprovider->capabilities() & QgsRasterDataProvider::Identify ) == 0 )
return false;
QMap< QString, QString > attributes, derivedAttributes;
QgsPoint idPoint = mCanvas->getCoordinateTransform()->toMapCoordinates( x, y );
idPoint = toLayerCoordinates( layer, idPoint );
QString type;
if ( layer->providerType() == "wms" )
{
type = tr( "WMS layer" );
//if WMS layer does not cover the view origin,
//we need to map the view pixel coordinates
//to WMS layer pixel coordinates
QgsRectangle viewExtent = mCanvas->extent();
QgsRectangle layerExtent = layer->extent();
double mapUnitsPerPixel = mCanvas->mapUnitsPerPixel();
if ( mapUnitsPerPixel > 0 && viewExtent.intersects( layerExtent ) )
{
double xMinView = viewExtent.xMinimum();
double yMaxView = viewExtent.yMaximum();
double xMinLayer = layerExtent.xMinimum();
double yMaxLayer = layerExtent.yMaximum();
idPoint.set(
xMinView < xMinLayer ? floor( x - ( xMinLayer - xMinView ) / mapUnitsPerPixel ) : x,
yMaxView > yMaxLayer ? floor( y - ( yMaxView - yMaxLayer ) / mapUnitsPerPixel ) : y
);
attributes.insert( tr( "Feature info" ), layer->identifyAsHtml( idPoint ) );
}
else
{
res = false;
}
}
else
{
type = tr( "Raster" );
res = layer->extent().contains( idPoint ) && layer->identify( idPoint, attributes );
}
if ( res )
{
derivedAttributes.insert( tr( "(clicked coordinate)" ), idPoint.toString() );
results()->addFeature( layer, type, attributes, derivedAttributes );
}
return res;
}
void QgsMapCanvas::panActionEnd( QPoint releasePoint )
{
// move map image and other items to standard position
moveCanvasContents( true ); // true means reset
// use start and end box points to calculate the extent
QgsPoint start = getCoordinateTransform()->toMapCoordinates( mCanvasProperties->rubberStartPoint );
QgsPoint end = getCoordinateTransform()->toMapCoordinates( releasePoint );
// modify the center
double dx = end.x() - start.x();
double dy = end.y() - start.y();
QgsPoint c = center();
c.set( c.x() - dx, c.y() - dy );
setCenter( c );
refresh();
}