void QgsComposerScaleBar::applyDefaultSize()
{
if ( mComposerMap )
{
setUnits( Meters );
double widthMeter = mapWidth();
int nUnitsPerSegment = widthMeter / 10.0; //default scalebar width equals half the map width
setNumUnitsPerSegment( nUnitsPerSegment );
if ( nUnitsPerSegment > 1000 )
{
setNumUnitsPerSegment(( int )( numUnitsPerSegment() / 1000.0 + 0.5 ) * 1000 );
setUnitLabeling( tr( "km" ) );
setNumMapUnitsPerScaleBarUnit( 1000 );
}
else
{
setUnitLabeling( tr( "m" ) );
}
setNumSegments( 4 );
setNumSegmentsLeft( 2 );
}
refreshSegmentMillimeters();
adjustBoxSize();
emit itemChanged();
}
void QgsComposerScaleBar::applyDefaultSize( QgsComposerScaleBar::ScaleBarUnits u )
{
if ( mComposerMap )
{
setUnits( u );
double upperMagnitudeMultiplier = 1.0;
double widthInSelectedUnits = mapWidth();
double initialUnitsPerSegment = widthInSelectedUnits / 10.0; //default scalebar width equals half the map width
setNumUnitsPerSegment( initialUnitsPerSegment );
switch ( mUnits )
{
case MapUnits:
{
upperMagnitudeMultiplier = 1.0;
setUnitLabeling( tr( "units" ) );
break;
}
case Meters:
{
if ( initialUnitsPerSegment > 1000.0 )
{
upperMagnitudeMultiplier = 1000.0;
setUnitLabeling( tr( "km" ) );
}
else
{
upperMagnitudeMultiplier = 1.0;
setUnitLabeling( tr( "m" ) );
}
break;
}
case Feet:
{
if ( initialUnitsPerSegment > 5419.95 )
{
upperMagnitudeMultiplier = 5419.95;
setUnitLabeling( tr( "miles" ) );
}
else
{
upperMagnitudeMultiplier = 1.0;
setUnitLabeling( tr( "ft" ) );
}
break;
}
case NauticalMiles:
{
upperMagnitudeMultiplier = 1;
setUnitLabeling( tr( "Nm" ) );
break;
}
}
double segmentWidth = initialUnitsPerSegment / upperMagnitudeMultiplier;
int segmentMagnitude = floor( log10( segmentWidth ) );
double unitsPerSegment = upperMagnitudeMultiplier * ( qPow( 10.0, segmentMagnitude ) );
double multiplier = floor(( widthInSelectedUnits / ( unitsPerSegment * 10.0 ) ) / 2.5 ) * 2.5;
if ( multiplier > 0 )
{
unitsPerSegment = unitsPerSegment * multiplier;
}
setNumUnitsPerSegment( unitsPerSegment );
setNumMapUnitsPerScaleBarUnit( upperMagnitudeMultiplier );
setNumSegments( 4 );
setNumSegmentsLeft( 2 );
}
refreshSegmentMillimeters();
adjustBoxSize();
emit itemChanged();
}