RangeView.hxx

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#ifndef RangeView_hxx
#define RangeView_hxx

#include <cmath>
#include <algorithm>
#include "Assert.hxx"
namespace CLAM
{

/*
        Implements the logic to navigate along a Range.
        @todo out of place centering
*/
class RangeView
{
        public:
                static double zoomExcentricity(double low, double high, double stiked)
                {
                        if (stiked<low) return 0.;
                        if (stiked>high) return 1.;
                        return (stiked-low)/(high-low);
                }
                static void zoom(double &low, double &high, double factor, double centering)
                {
                        CLAM_ASSERT(centering>=0. && centering<=1.,
                                "RangeView: zooming using a centering factor not in the [0,1] interval.");
                        double span = high-low;
                        double midPoint = low + (high-low)*centering;
                        low = midPoint - span*factor*centering;
                        high = midPoint + span*factor*(1-centering);
                }
                static void keepWithinInterval(double & low, double & high, double lowest, double highest)
                {
                        double span = high-low;
                        if (high>highest)
                        {
                                high=highest;
                                low=high-span;
                        }
                        if (low<lowest)
                        {
                                low=lowest;
                                high=std::min(highest,low+span);
                        }
                }
};

} // namespace CLAM

#endif//RangeView_hxx