content: /*
   * Copyright (c) 1997 - 2016
   * Actelion Pharmaceuticals Ltd.
   * Gewerbestrasse 16
   * CH-4123 Allschwil, Switzerland
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   *    names of its contributors may be used to endorse or promote products
   *    derived from this software without specific prior written permission.
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   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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  package com.actelion.research.chem.descriptor.flexophore.completegraphmatcher;
  
  import com.actelion.research.chem.descriptor.flexophore.DistHist;
  import com.actelion.research.chem.descriptor.flexophore.generator.ConstantsFlexophoreGenerator;
  
  /**
   * 
   * 
   * HistogramMatchCalculator
   * @author Modest von Korff
   * Oct 2, 2012 MvK: Start implementation
   * May 15 2013 MvK: Heavy bug detected. Wrong similarity results. reset() added.
   * Mar 01 2016 MvK sliding filter added.
   * 2020 March, re-written
   */
  public class HistogramMatchCalculator {
  
  	/**
  	 *
  	 * @param dh1
  	 * @param indexDistHist1At1
  	 * @param indexDistHist1At2
  	 * @param dh2
  	 * @param indexDistHist2At1
  	 * @param indexDistHist2At2
  	 * @return integral of overlap
  	 */
  	public static double getFractionOverlapIntegral(DistHist dh1, int indexDistHist1At1, int indexDistHist1At2, DistHist dh2, int indexDistHist2At1, int indexDistHist2At2){
  		int indexPostStartDistHist1 = dh1.getIndexPosStartForDistHist(indexDistHist1At1, indexDistHist1At2);
  		int indexPostStartDistHist2 = dh2.getIndexPosStartForDistHist(indexDistHist2At1, indexDistHist2At2);
  		int n = ConstantsFlexophoreGenerator.BINS_HISTOGRAM;
  		double sumMin = 0;
  		double sumMax = 0;
  
  		for (int i = 0; i < n; i++) {
  			int v1 = dh1.getValueAtAbsolutePosition(indexPostStartDistHist1+i);
  			int v2 = dh2.getValueAtAbsolutePosition(indexPostStartDistHist2+i);
  			sumMin += Math.min(v1, v2);
  			sumMax += Math.max(v1, v2);
  		}
  		double score = sumMin / sumMax;
  		return score;
  	}
  	public static double getFractionOverlappingBins(DistHist dh1, int indexDistHist1At1, int indexDistHist1At2, DistHist dh2, int indexDistHist2At1, int indexDistHist2At2){
  		int indexPostStartDistHist1 = dh1.getIndexPosStartForDistHist(indexDistHist1At1, indexDistHist1At2);
  		int indexPostStartDistHist2 = dh2.getIndexPosStartForDistHist(indexDistHist2At1, indexDistHist2At2);
  		int n = ConstantsFlexophoreGenerator.BINS_HISTOGRAM;
  		double sumMin = 0;
  		double sumMax = 0;
  
  		double sum1=0;
  		double sum2=0;
  		for (int i = 0; i < n; i++) {
  			int v1 = (dh1.getValueAtAbsolutePosition(indexPostStartDistHist1+i)==0)?0:1;
  			int v2 = (dh2.getValueAtAbsolutePosition(indexPostStartDistHist2+i)==0)?0:1;
  			sum1 += v1;
  			sum2 += v2;
  			sumMin += Math.min(v1, v2);
  			sumMax += Math.max(v1, v2);
  		}
  		double score = sumMin / Math.min(sum1, sum2);
  		return score;
  	}
  
  	public static double getPercentageOverlap(DistHist dh1, int indexDistHist1At1, int indexDistHist1At2, DistHist dh2, int indexDistHist2At1, int indexDistHist2At2){
  		int indexPostStartDistHist1 = dh1.getIndexPosStartForDistHist(indexDistHist1At1, indexDistHist1At2);
  		int indexPostStartDistHist2 = dh2.getIndexPosStartForDistHist(indexDistHist2At1, indexDistHist2At2);
  		int n = ConstantsFlexophoreGenerator.BINS_HISTOGRAM;
  		double sumMin = 0;
  		double sum1 = 0;
  		double sum2 = 0;
  		for (int i = 0; i < n; i++) {
  			int v1 = dh1.getValueAtAbsolutePosition(indexPostStartDistHist1+i);
  			int v2 = dh2.getValueAtAbsolutePosition(indexPostStartDistHist2+i);
  			sumMin += Math.min(v1, v2);
  
  			sum1 += v1;
  			sum2 += v2;
  		}
  		double score = sumMin / Math.max(sum1, sum2);;
  		return score;
  	}
  
  
  
  }
  