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annotate pkg/common/time.go @ 3235:0c5a28ffe9ee

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available_fairway_depth: flexible layouting options
author Thomas Junk <thomas.junk@intevation.de>
date Fri, 10 May 2019 10:49:37 +0200
parents 8c4c1b3fd856
children c86a8e70b40f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 type ValueRangeKind int
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31
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32 const (
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33 ValueBelow ValueRangeKind = -1
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34 ValueInside ValueRangeKind = 0
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35 ValueAbove ValueRangeKind = +1
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36 )
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37
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38 func InterpolateValueByTime(t1 time.Time, m1 float64, t2 time.Time, m2 float64) func(time.Time) (float64, ValueRangeKind) {
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39
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40 // f(t1) = m1
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41 // f(t2) = m2
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42 // m1 = t1*a + b <=> b = m1 - t1*a
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43 // m2 = t2*a + b
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44 // m1 - m2 = a*(t1 - t2)
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45 // a = (m1 - m2)/(t1 - t2) for t1 != t2
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46
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47 if t1.Equal(t2) {
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48 return func(t time.Time) (float64, ValueRangeKind) {
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49 switch {
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50 case t.Before(t1):
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51 return 0, ValueBelow
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52 case t.After(t1):
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53 return 0, ValueAbove
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54 default:
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55 return m1 + (m2-m1)/2, ValueInside
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56 }
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57 }
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58 }
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59 var min, max time.Time
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60 if t1.Before(t2) {
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61 min, max = t1, t2
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62 } else {
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63 min, max = t2, t1
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64 }
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65
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66 a := (m1 - m2) / t1.Sub(t2).Seconds()
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67 b := m1 - a*float64(t1.Unix())
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68
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69 return func(t time.Time) (float64, ValueRangeKind) {
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70 switch {
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71 case t.Before(min):
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72 return 0, ValueBelow
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73 case t.After(max):
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74 return 0, ValueAbove
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75 default:
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76 return a*float64(t.Unix()) + b, ValueInside
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77 }
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78 }
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79 }
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80
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81 func InterpolateTimeByValue(t1 time.Time, m1 float64, t2 time.Time, m2 float64) func(float64) (time.Time, ValueRangeKind) {
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82
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83 // f(m1) = t1
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84 // f(m2) = t2
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85 // t1 = m1*a + b <=> b = t1 - m1*a
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86 // t2 = m2*a + b
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87
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88 // t1 - t2 = a*(m1 - m2)
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89 // a = (t1-t2)/(m1 - m2) for m1 != m2
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90
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91 if m1 == m2 {
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92 return func(m float64) (time.Time, ValueRangeKind) {
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93 switch {
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94 case m < m1:
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95 return time.Time{}, ValueBelow
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96 case m > m1:
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97 return time.Time{}, ValueAbove
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98 default:
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99 return t1.Add(t2.Sub(t1) / 2), ValueInside
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100 }
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101 }
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102 }
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103
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104 min, max := math.Min(m1, m2), math.Max(m1, m2)
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105
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106 a := t1.Sub(t2).Seconds() / (m1 - m2)
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107 b := float64(t1.Unix()) - m1*a
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108
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109 return func(m float64) (time.Time, ValueRangeKind) {
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110 switch {
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111 case m < min:
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112 return time.Time{}, ValueBelow
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113 case m > max:
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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114 return time.Time{}, ValueAbove
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parents: 2929
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115 default:
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116 return time.Unix(int64(math.Ceil(m*a+b)), 0), ValueInside
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parents: 2929
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117 }
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parents: 2929
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118 }
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119 }