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tdf#94004 Wrap Power trendline equation

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Wrap equation trendline if it is longer than chart width
Continue https://gerrit.libreoffice.org/18397/

Change-Id: If805f712a29c412a01209533842f9a6c797cbaf1
Reviewed-on: https://gerrit.libreoffice.org/25418
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: jan iversen <jani@documentfoundation.org>
This commit is contained in:
Laurent Balland-Poirier 2016-05-24 21:40:57 +02:00 committed by jan iversen
parent 0159ef4fbf
commit e420a335f7
2 changed files with 37 additions and 14 deletions
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2
chart2/qa/extras/chart2_trendcalculators.cxx
View File

@ -136,7 +136,7 @@ void Chart2TrendCalculators::testPotentialRegression2()
xValues[i] = d;
yValues[i] = -2.0 * pow ( d, 3 );
}
checkCalculator( xValues, yValues, "f(x) = -2 x^3");
checkCalculator( xValues, yValues, "f(x) = "+ aMinusSign +" 2 x^3");
}
// test y = - 2 X - 5

49
chart2/source/tools/PotentialRegressionCurveCalculator.cxx
View File

@ -20,6 +20,7 @@
#include "PotentialRegressionCurveCalculator.hxx"
#include "macros.hxx"
#include "RegressionCalculationHelper.hxx"
#include <SpecialUnicodes.hxx>
#include <rtl/math.hxx>
#include <rtl/ustrbuf.hxx>
@ -142,32 +143,54 @@ uno::Sequence< geometry::RealPoint2D > SAL_CALL PotentialRegressionCurveCalculat
OUString PotentialRegressionCurveCalculator::ImplGetRepresentation(
const uno::Reference< util::XNumberFormatter >& xNumFormatter,
sal_Int32 nNumberFormatKey, sal_Int32* /* pFormulaLength = nullptr */ ) const
sal_Int32 nNumberFormatKey, sal_Int32* pFormulaMaxWidth /* = nullptr */ ) const
{
bool bHasIntercept = !rtl::math::approxEqual( fabs(m_fIntercept), 1.0 );
OUStringBuffer aBuf( "f(x) = ");
sal_Int32 nLineLength = aBuf.getLength();
sal_Int32 nValueLength=0;
if ( pFormulaMaxWidth && *pFormulaMaxWidth > 0 ) // count nValueLength
{
sal_Int32 nCharMin = nLineLength + 4; // 4 = "x^" + 2 extra characters
if ( m_fIntercept != 0.0 && m_fSlope != 0.0 )
{
if ( m_fIntercept < 0.0 )
nCharMin += 2; // "- "
if ( bHasIntercept )
nValueLength = (*pFormulaMaxWidth - nCharMin) / 2;
}
if ( nValueLength == 0 ) // not yet calculated
nValueLength = *pFormulaMaxWidth - nCharMin;
if ( nValueLength <= 0 )
nValueLength = 1;
}
if( m_fIntercept == 0.0 )
{
aBuf.append( '0' );
}
else if( m_fSlope == 0.0 )
{
aBuf.append( getFormattedString( xNumFormatter, nNumberFormatKey, m_fIntercept ));
}
else
{
if( ! rtl::math::approxEqual( fabs(m_fIntercept), 1.0 ) )
// temporary buffer
OUStringBuffer aTmpBuf("");
// if nValueLength not calculated then nullptr
sal_Int32* pValueLength = nValueLength ? &nValueLength : nullptr;
if ( m_fIntercept < 0.0 ) // add intercept value
aTmpBuf.append( aMinusSign+" " );
if( bHasIntercept )
{
aBuf.append( getFormattedString( xNumFormatter, nNumberFormatKey, m_fIntercept ));
aBuf.append( ' ');
OUString aValueString = getFormattedString( xNumFormatter, nNumberFormatKey, fabs(m_fIntercept), pValueLength );
if ( aValueString != "1" ) // aValueString may be rounded to 1 if nValueLength is small
{
aTmpBuf.append( aValueString + " " );
}
}
else // skip intercept if its value is 1 (or near 1)
if( m_fSlope != 0.0 ) // add slope value
{
if ( m_fIntercept < 0.0 )
aBuf.append( "- " );
aTmpBuf.append( "x^" );
aTmpBuf.append( getFormattedString( xNumFormatter, nNumberFormatKey, m_fSlope, pValueLength ));
}
aBuf.append( "x^" );
aBuf.append( getFormattedString( xNumFormatter, nNumberFormatKey, m_fSlope ));
addStringToEquation( aBuf, nLineLength, aTmpBuf, pFormulaMaxWidth );
}
return aBuf.makeStringAndClear();