CategoryPositionHelper.cxx

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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#include "CategoryPositionHelper.hxx"
 
namespace chart
{
 
CategoryPositionHelper::CategoryPositionHelper( double fSeriesCount, double fCategoryWidth )
    : m_fSeriesCount(fSeriesCount)
    , m_fCategoryWidth(fCategoryWidth)
    , m_fInnerDistance(0.0)
    , m_fOuterDistance(1.0)
{
}
 
CategoryPositionHelper::~CategoryPositionHelper()
{
}
 
double CategoryPositionHelper::getScaledSlotWidth() const
{
    double fWidth = m_fCategoryWidth /
                (  m_fSeriesCount
                 + m_fOuterDistance
                 + m_fInnerDistance*( m_fSeriesCount - 1.0) );
    return fWidth;
}
 
double CategoryPositionHelper::getScaledSlotPos( double fScaledXPos, double fSeriesNumber ) const
{
    //the returned position is in the middle of the rect
    //fSeriesNumber 0...n-1
    double fPos = fScaledXPos
           - (m_fCategoryWidth/2.0)
           + (m_fOuterDistance/2.0 + fSeriesNumber*(1.0+m_fInnerDistance)) * getScaledSlotWidth()
           + getScaledSlotWidth()/2.0;
    return fPos;
}
 
void CategoryPositionHelper::setInnerDistance( double fInnerDistance )
{
    if( fInnerDistance < -1.0 )
        fInnerDistance = -1.0;
    if( fInnerDistance > 1.0 )
        fInnerDistance = 1.0;
    m_fInnerDistance = fInnerDistance;
}
 
void CategoryPositionHelper::setOuterDistance( double fOuterDistance )
{
    if( fOuterDistance < 0.0 )
        fOuterDistance = 0.0;
    if( fOuterDistance > 6.0 )
        fOuterDistance = 6.0;
    m_fOuterDistance = fOuterDistance;
}
 
void CategoryPositionHelper::setCategoryWidth( double fCategoryWidth )
{
    m_fCategoryWidth = fCategoryWidth;
}
 
} //namespace chart
 
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