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annotate pkg/mesh/classbreaks.go @ 4889:ab6eb160cd29

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Sounding result cache: Start background cache cleanup lazily only when the cache is really used.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Sun, 09 Feb 2020 20:24:54 +0100
parents 4847ac70103a
children 34bc6041e61e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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) 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
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14 package mesh
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15
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16 import (
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17 "context"
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18 "database/sql"
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19 "errors"
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20 "math"
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21 "sort"
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22 "strconv"
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23 "strings"
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24 )
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25
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26 const (
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27 selectClassBreaksSQL = `
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28 SELECT config_val FROM sys_admin.system_config
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29 WHERE config_key = $1`
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30 )
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31
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32 func SampleDiffHeights(min, max, step float64) []float64 {
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33 var heights []float64
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34 switch {
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35 case min >= 0: // All values positive.
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36 for v := 0.0; v <= max; v += step {
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37 if v >= min {
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38 heights = append(heights, v)
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39 }
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40 }
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41 case max <= 0: // All values negative.
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42 for v := 0.0; v >= min; v -= step {
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43 if v <= max {
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44 heights = append(heights, v)
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45 }
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46 }
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47 default: // Positive and negative.
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48 for v := step; v <= max; v += step {
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49 heights = append(heights, v)
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50 }
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51 for i, j := 0, len(heights)-1; i < j; i, j = i+1, j-1 {
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52 heights[i], heights[j] = heights[j], heights[i]
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53 }
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54 for v := 0.0; v >= min; v -= step {
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55 heights = append(heights, v)
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56 }
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57 }
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58 return heights
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59 }
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60
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61 func ParseClassBreaks(config string) ([]float64, error) {
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62
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63 parts := strings.Split(config, ",")
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64 classes := make([]float64, 0, len(parts))
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65 for _, part := range parts {
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66 if idx := strings.IndexRune(part, ':'); idx >= 0 {
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67 part = part[:idx]
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68 }
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69 if part = strings.TrimSpace(part); part == "" {
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70 continue
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71 }
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72 v, err := strconv.ParseFloat(part, 64)
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73 if err != nil {
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74 return nil, err
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75 }
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76 classes = append(classes, v)
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77 }
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78
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79 sort.Float64s(classes)
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80 return classes, nil
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81 }
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82
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83 func LoadClassBreaks(ctx context.Context, tx *sql.Tx, key string) ([]float64, error) {
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84
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85 var config sql.NullString
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86
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87 err := tx.QueryRowContext(ctx, selectClassBreaksSQL, key).Scan(&config)
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88
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89 switch {
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90 case err == sql.ErrNoRows:
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91 return nil, nil
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92 case err != nil:
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93 return nil, err
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94 case !config.Valid:
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95 return nil, errors.New("invalid config string")
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96 }
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97
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98 return ParseClassBreaks(config.String)
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99 }
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100
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101 func round(v float64) float64 {
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102 return math.Round(v*10000) / 10000
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103 }
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104
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105 func ExtrapolateClassBreaks(cbs []float64, min, max float64) []float64 {
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106 if min > max {
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107 min, max = max, min
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108 }
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109
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110 n := make([]float64, len(cbs))
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111 copy(n, cbs)
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112 sort.Float64s(n)
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113
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114 for len(n) > 0 && n[0] < min {
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115 n = n[1:]
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116 }
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117
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118 if len(n) == 0 {
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119 return n
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120 }
7a9388943840 morphology: Clip class breaks again Z min and max of the the height model.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4214
diff changeset
121
7a9388943840 morphology: Clip class breaks again Z min and max of the the height model.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4214
diff changeset
122 for len(n) > 0 && n[len(n)-1] > max {
7a9388943840 morphology: Clip class breaks again Z min and max of the the height model.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4214
diff changeset
123 n = n[:len(n)-1]
7a9388943840 morphology: Clip class breaks again Z min and max of the the height model.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4214
diff changeset
124 }
7a9388943840 morphology: Clip class breaks again Z min and max of the the height model.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4214
diff changeset
125
7a9388943840 morphology: Clip class breaks again Z min and max of the the height model.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4214
diff changeset
126 if len(n) == 0 {
7a9388943840 morphology: Clip class breaks again Z min and max of the the height model.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4214
diff changeset
127 return n
7a9388943840 morphology: Clip class breaks again Z min and max of the the height model.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4214
diff changeset
128 }
7a9388943840 morphology: Clip class breaks again Z min and max of the the height model.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4214
diff changeset
129
3882
37d5c4441c70 Use custom morpho class breaks in sounding result contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3836
diff changeset
130 for min < n[0] {
37d5c4441c70 Use custom morpho class breaks in sounding result contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3836
diff changeset
131 diff := n[1] - n[0]
37d5c4441c70 Use custom morpho class breaks in sounding result contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3836
diff changeset
132 if diff == 0 {
37d5c4441c70 Use custom morpho class breaks in sounding result contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3836
diff changeset
133 break
37d5c4441c70 Use custom morpho class breaks in sounding result contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3836
diff changeset
134 }
37d5c4441c70 Use custom morpho class breaks in sounding result contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3836
diff changeset
135 m := make([]float64, len(n)+1)
4746
5e0041fd3cba Round height values of extrapolated classbreaks to four place behind the dot.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4687
diff changeset
136 m[0] = round(n[0] - diff)
3882
37d5c4441c70 Use custom morpho class breaks in sounding result contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3836
diff changeset
137 copy(m[1:], n)
37d5c4441c70 Use custom morpho class breaks in sounding result contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3836
diff changeset
138 n = m
37d5c4441c70 Use custom morpho class breaks in sounding result contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3836
diff changeset
139 }
37d5c4441c70 Use custom morpho class breaks in sounding result contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3836
diff changeset
140
37d5c4441c70 Use custom morpho class breaks in sounding result contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3836
diff changeset
141 for max > n[len(n)-1] {
37d5c4441c70 Use custom morpho class breaks in sounding result contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3836
diff changeset
142 diff := n[len(n)-1] - n[len(n)-2]
37d5c4441c70 Use custom morpho class breaks in sounding result contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3836
diff changeset
143 if diff == 0 {
37d5c4441c70 Use custom morpho class breaks in sounding result contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3836
diff changeset
144 break
37d5c4441c70 Use custom morpho class breaks in sounding result contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3836
diff changeset
145 }
4746
5e0041fd3cba Round height values of extrapolated classbreaks to four place behind the dot.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4687
diff changeset
146 n = append(n, round(n[len(n)-1]+diff))
3882
37d5c4441c70 Use custom morpho class breaks in sounding result contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3836
diff changeset
147 }
37d5c4441c70 Use custom morpho class breaks in sounding result contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3836
diff changeset
148
37d5c4441c70 Use custom morpho class breaks in sounding result contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3836
diff changeset
149 return n
37d5c4441c70 Use custom morpho class breaks in sounding result contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3836
diff changeset
150 }