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/*
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* Copyright (C) 2016 Álinson Santos Xavier <isoron@gmail.com>
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*
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* This file is part of Loop Habit Tracker.
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*
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* Loop Habit Tracker is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or (at your
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* option) any later version.
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*
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* Loop Habit Tracker is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.isoron.uhabits.core.models;
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import org.apache.commons.lang3.builder.*;
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import static java.lang.Math.*;
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import static org.isoron.uhabits.core.utils.StringUtils.defaultToStringStyle;
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/**
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* Represents how strong a habit is at a certain date.
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*/
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public final class Score
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{
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/**
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* Timestamp of the day to which this score applies. Time of day should be
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* midnight (UTC).
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*/
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private final Timestamp timestamp;
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/**
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* Value of the score.
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*/
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private final double value;
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public Score(Timestamp timestamp, double value)
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{
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this.timestamp = timestamp;
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this.value = value;
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}
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/**
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* Given the frequency of the habit, the previous score, and the value of
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* the current checkmark, computes the current score for the habit.
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* <p>
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* The frequency of the habit is the number of repetitions divided by the
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* length of the interval. For example, a habit that should be repeated 3
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* times in 8 days has frequency 3.0 / 8.0 = 0.375.
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*
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* @param frequency the frequency of the habit
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* @param previousScore the previous score of the habit
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* @param checkmarkValue the value of the current checkmark
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* @return the current score
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*/
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public static double compute(double frequency,
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double previousScore,
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double checkmarkValue)
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{
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double multiplier = pow(0.5, sqrt(frequency) / 13.0);
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double score = previousScore * multiplier;
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score += checkmarkValue * (1 - multiplier);
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return score;
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}
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public int compareNewer(Score other)
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{
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return getTimestamp().compareTo(other.getTimestamp());
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}
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public Timestamp getTimestamp()
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{
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return timestamp;
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}
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public double getValue()
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{
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return value;
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}
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@Override
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public String toString()
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{
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return new ToStringBuilder(this, defaultToStringStyle())
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.append("timestamp", timestamp)
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.append("value", value)
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.toString();
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}
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@Override
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public boolean equals(Object o)
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{
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if (this == o) return true;
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if (o == null || getClass() != o.getClass()) return false;
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Score score = (Score) o;
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return new EqualsBuilder()
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.append(value, score.value)
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.append(timestamp, score.timestamp)
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.isEquals();
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}
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@Override
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public int hashCode()
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{
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return new HashCodeBuilder(17, 37)
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.append(timestamp)
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.append(value)
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.toHashCode();
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}
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}
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@ -0,0 +1,58 @@
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/*
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* Copyright (C) 2016 Álinson Santos Xavier <isoron@gmail.com>
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*
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* This file is part of Loop Habit Tracker.
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*
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* Loop Habit Tracker is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or (at your
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* option) any later version.
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*
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* Loop Habit Tracker is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.isoron.uhabits.core.models
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import kotlin.math.*
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data class Score(
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val timestamp: Timestamp,
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val value: Double,
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) {
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fun compareNewer(other: Score): Int {
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return timestamp.compareTo(other.timestamp)
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}
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companion object {
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/**
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* Given the frequency of the habit, the previous score, and the value of
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* the current checkmark, computes the current score for the habit.
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*
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* The frequency of the habit is the number of repetitions divided by the
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* length of the interval. For example, a habit that should be repeated 3
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* times in 8 days has frequency 3.0 / 8.0 = 0.375.
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*
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* @param frequency the frequency of the habit
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* @param previousScore the previous score of the habit
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* @param checkmarkValue the value of the current checkmark
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* @return the current score
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*/
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@JvmStatic
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fun compute(
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frequency: Double,
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previousScore: Double,
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checkmarkValue: Double,
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): Double {
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val multiplier = Math.pow(0.5, sqrt(frequency) / 13.0)
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var score = previousScore * multiplier
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score += checkmarkValue * (1 - multiplier)
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return score
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}
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}
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}
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