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Simplified waterlevel classification.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Wed, 22 May 2019 10:47:04 +0200
parents c86a8e70b40f
children cb74aa69954e
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1 // This is Free Software under GNU Affero General Public License v >= 3.0
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2 // without warranty, see README.md and license for details.
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3 //
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4 // SPDX-License-Identifier: AGPL-3.0-or-later
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5 // License-Filename: LICENSES/AGPL-3.0.txt
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6 //
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7 // Copyright (C) 2018, 2019 by via donau
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8 // – Österreichische Wasserstraßen-Gesellschaft mbH
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9 // Software engineering by Intevation GmbH
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10 //
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11 // Author(s):
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12 // * Sascha L. Teichmann <sascha.teichmann@intevation.de>
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13 // * Bernhard E. Reiter <bernhard.reiter@intevation.de>
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14
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15 package common
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16
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17 import (
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18 "math"
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19 "time"
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20 )
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21
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22 const (
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23 // time.RFC3339 equals "simplified ISO format as defined by ECMA-262"
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24 // https://tc39.github.io/ecma262/#sec-date-time-string-format
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25 // and "SHOULD be used in new protocols on the Internet." (RFC section 5.6)
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26 TimeFormat = time.RFC3339
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27 DateFormat = "2006-01-02"
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28 )
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29
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30 var utc0 = time.Unix(0, 0)
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31
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32 func InterpolateTime(t1 time.Time, m1 float64, t2 time.Time, m2 float64) func(float64) time.Time {
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33
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34 // f(m1) = t1
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35 // f(m2) = t2
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36 // t1 = m1*a + b <=> b = t1 - m1*a
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37 // t2 = m2*a + b
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38
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39 // t1 - t2 = a*(m1 - m2)
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40 // a = (t1-t2)/(m1 - m2) for m1 != m2
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41
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42 if m1 == m2 {
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43 t := t1.Add(t2.Sub(t1) / 2)
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44 return func(float64) time.Time { return t }
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45 }
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46
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47 a := t1.Sub(t2).Seconds() / (m1 - m2)
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48 b := t1.Sub(utc0).Seconds() - m1*a
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49
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50 return func(m float64) time.Time {
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51 x := m*a + b
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52 secs := math.Ceil(x)
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53 nsecs := math.Ceil((x - secs) * (999999999 + 1))
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54 return time.Unix(int64(secs), int64(nsecs))
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55 }
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56 }