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annotate pkg/common/time.go @ 3678:8f58851927c0

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client: make layer factory only return new layer config for individual maps instead of each time it is invoked. The purpose of the factory was to support multiple maps with individual layers. But returning a new config each time it is invoked leads to bugs that rely on the layer's state. Now this factory reuses the same objects it created before, per map.
author Markus Kottlaender <markus@intevation.de>
date Mon, 17 Jun 2019 17:31:35 +0200
parents ecb4baa2be1a
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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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 }