Mercurial > gemma

annotate pkg/geoserver/templates.go @ 3841:8e47d6f12998 sld-colors

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Merged default into sld-colors branch.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 08 Jul 2019 14:34:42 +0200
parents 0ffea636d6b0
children 3fcc4e11fc00
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 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 geoserver
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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 "fmt"
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20 "image/color"
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21 "math"
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22 "sort"
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23 "strconv"
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24 "strings"
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25 "text/template"
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26
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27 "gemma.intevation.de/gemma/pkg/auth"
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28 )
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29
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30 const (
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31 selectClassBreaksSQL = `
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32 SELECT config_val FROM sys_admin.system_config
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33 WHERE config_key = $1`
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34 )
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35
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36 func init() {
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37 RegisterStylePreprocessor(
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38 "sounding_results_contour_lines_geoserver",
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39 templateContourLinesFunc("morphology_classbreaks"))
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40 RegisterStylePreprocessor(
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41 "sounding_differences",
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42 templateContourLinesFunc("morphology_classbreaks_compare"))
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43 }
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44
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45 type (
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46 colorClass struct {
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47 value float64
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48 color color.RGBA
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49 }
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50
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51 colorClasses []colorClass
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52
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53 classBreak struct {
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54 High float64
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55 HasHigh bool
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56 Low float64
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57 HasLow bool
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58 color color.RGBA
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59 }
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60 )
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61
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62 func (cb *classBreak) Color() string {
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63 return fmt.Sprintf("#%02x%02x%02x",
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64 cb.color.R,
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65 cb.color.G,
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66 cb.color.B,
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67 )
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68 }
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69
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70 func (cc colorClasses) toClassBreaks() []classBreak {
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71
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72 cbs := make([]classBreak, len(cc), len(cc)+1)
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73 for i := range cc {
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74 if i > 0 {
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75 cbs[i].Low = cc[i-1].value
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76 cbs[i].HasLow = true
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77 }
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78 cbs[i].High = cc[i].value
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79 cbs[i].HasHigh = true
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80 cbs[i].color = cc[i].color
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81 }
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82 if len(cc) > 0 {
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83 cbs = append(cbs, classBreak{
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84 color: cc[len(cc)-1].color,
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85 Low: cc[len(cc)-1].value,
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86 HasLow: true,
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87 })
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88 }
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89
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90 return cbs
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91 }
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92
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93 func (cc colorClasses) interpolate(v float64) (color.RGBA, bool) {
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94 if len(cc) == 0 || v < cc[0].value || v > cc[len(cc)-1].value {
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95 return color.RGBA{}, false
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96 }
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97
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98 if len(cc) == 1 {
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99 return cc[0].color, cc[0].value == v
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100 }
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101
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102 for i := 0; i < len(cc)-1; i++ {
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103 v1 := cc[i].value
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104 v2 := cc[i+1].value
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105 if v1 <= v && v <= v2 {
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106 // f(v1) = 0
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107 // f(v2) = 1
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108 // 0 = m*v1 + c <=> c = -m*v1
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109 // 1 = m*v2 + c
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110 // (1 - 0) = m*(v2 - v1)
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111 // m = 1/(v2 - v1) for v2 != v1
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112
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113 if v1 == v2 {
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114 return color.RGBA{
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115 R: uint8((uint16(cc[i].color.R) + uint16(cc[i+1].color.R)) / 2),
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116 G: uint8((uint16(cc[i].color.G) + uint16(cc[i+1].color.G)) / 2),
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117 B: uint8((uint16(cc[i].color.B) + uint16(cc[i+1].color.B)) / 2),
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parents:
diff changeset
118 A: 0xff,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
119 }, true
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
120 }
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parents:
diff changeset
121 m := 1 / (v2 - v1)
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parents:
diff changeset
122 c := -m * v1
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
123 s := v*m + c
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
124
3830
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diff changeset
125 interpolate := func(a, b uint8) uint8 {
464a6a6e05e6 Clean color handling a bit.
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parents: 3828
diff changeset
126 v := math.Round(float64(a) + (float64(b)-float64(a))*s)
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parents: 3828
diff changeset
127 if v < 0 {
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parents: 3828
diff changeset
128 return 0
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parents: 3828
diff changeset
129 }
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parents: 3828
diff changeset
130 if v > 255 {
464a6a6e05e6 Clean color handling a bit.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3828
diff changeset
131 return 255
464a6a6e05e6 Clean color handling a bit.
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parents: 3828
diff changeset
132 }
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parents: 3828
diff changeset
133 return uint8(v)
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parents: 3828
diff changeset
134 }
3826
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parents:
diff changeset
135
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parents:
diff changeset
136 return color.RGBA{
3830
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parents: 3828
diff changeset
137 R: interpolate(cc[i].color.R, cc[i+1].color.R),
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parents: 3828
diff changeset
138 G: interpolate(cc[i].color.G, cc[i+1].color.G),
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139 B: interpolate(cc[i].color.B, cc[i+1].color.B),
3826
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140 A: 0xff,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
141 }, true
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
142 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
143 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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144
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
145 return color.RGBA{}, false
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
146 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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147
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
148 func parseColorClasses(s string) (colorClasses, error) {
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parents:
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149
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
150 var err error
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
151
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diff changeset
152 parseFloat := func(s string) float64 {
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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153 var v float64
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
154 if err == nil {
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
155 v, err = strconv.ParseFloat(s, 64)
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
156 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
157 return v
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
158 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
159
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
160 parseColor := func(s string) color.RGBA {
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
161 if err != nil {
4b1184fa0326 Added templating and a failing test.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
162 return color.RGBA{}
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
163 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
164 s = strings.Map(func(r rune) rune {
4b1184fa0326 Added templating and a failing test.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
165 if ('a' <= r && r <= 'f') || ('0' <= r && r <= '9') {
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
166 return r
4b1184fa0326 Added templating and a failing test.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
167 }
4b1184fa0326 Added templating and a failing test.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
168 return -1
4b1184fa0326 Added templating and a failing test.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
169 }, strings.ToLower(s))
4b1184fa0326 Added templating and a failing test.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
170
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
171 var v int64
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
172 v, err = strconv.ParseInt(s, 16, 64)
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parents:
diff changeset
173 return color.RGBA{
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
174 R: uint8(v >> 16),
4b1184fa0326 Added templating and a failing test.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
175 G: uint8(v >> 8),
4b1184fa0326 Added templating and a failing test.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
176 B: uint8(v >> 0),
4b1184fa0326 Added templating and a failing test.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
177 A: 0xff,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
178 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
179 }
4b1184fa0326 Added templating and a failing test.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
180
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
181 lines := strings.Split(s, ",")
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
182
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
183 // first pass: find defined colors
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
184 var defined colorClasses
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
185
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
186 for _, line := range lines {
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
187 // ignore the lines w/o a color.
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
188 if !strings.ContainsRune(line, ':') {
4b1184fa0326 Added templating and a failing test.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
189 continue
4b1184fa0326 Added templating and a failing test.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
190 }
4b1184fa0326 Added templating and a failing test.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
191 parts := strings.SplitN(line, ":", 2)
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
192 if len(parts) < 2 {
4b1184fa0326 Added templating and a failing test.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
193 continue
4b1184fa0326 Added templating and a failing test.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
194 }
4b1184fa0326 Added templating and a failing test.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
195 value := parseFloat(parts[0])
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
196 color := parseColor(parts[1])
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
197
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
198 defined = append(defined, colorClass{
4b1184fa0326 Added templating and a failing test.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
199 value: value,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
200 color: color,
4b1184fa0326 Added templating and a failing test.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
201 })
4b1184fa0326 Added templating and a failing test.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
202 }
4b1184fa0326 Added templating and a failing test.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
203
4b1184fa0326 Added templating and a failing test.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
204 if err != nil {
4b1184fa0326 Added templating and a failing test.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
205 return nil, err
4b1184fa0326 Added templating and a failing test.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
206 }
4b1184fa0326 Added templating and a failing test.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
207
4b1184fa0326 Added templating and a failing test.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
208 sort.Slice(defined, func(i, j int) bool {
4b1184fa0326 Added templating and a failing test.
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parents:
diff changeset
209 return defined[i].value < defined[j].value
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
210 })
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
211
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
212 // second pass: interpolate the rest
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
213 var final colorClasses
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
214 for _, line := range lines {
4b1184fa0326 Added templating and a failing test.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
215 if idx := strings.IndexRune(line, ':'); idx >= 0 {
4b1184fa0326 Added templating and a failing test.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
216 line = line[:idx]
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
217 }
4b1184fa0326 Added templating and a failing test.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
218 value := parseFloat(line)
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
219 if color, ok := defined.interpolate(value); ok {
4b1184fa0326 Added templating and a failing test.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
220 final = append(final, colorClass{
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
221 value: value,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
222 color: color,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
223 })
4b1184fa0326 Added templating and a failing test.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
224 }
4b1184fa0326 Added templating and a failing test.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
225 }
4b1184fa0326 Added templating and a failing test.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
226
4b1184fa0326 Added templating and a failing test.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
227 return final, err
4b1184fa0326 Added templating and a failing test.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
228 }
3828
885eb90255ff Cleanup templating of styles [WIP].
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parents: 3826
diff changeset
229
3831
0ffea636d6b0 Prepared class break templating mechanism to work with differences, too. Needs an adjusted template.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3830
diff changeset
230 func templateContourLinesFunc(configKey string) func(string) (string, error) {
0ffea636d6b0 Prepared class break templating mechanism to work with differences, too. Needs an adjusted template.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3830
diff changeset
231 return func(data string) (string, error) {
0ffea636d6b0 Prepared class break templating mechanism to work with differences, too. Needs an adjusted template.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3830
diff changeset
232 return templateContourLines(data, configKey)
0ffea636d6b0 Prepared class break templating mechanism to work with differences, too. Needs an adjusted template.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3830
diff changeset
233 }
0ffea636d6b0 Prepared class break templating mechanism to work with differences, too. Needs an adjusted template.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3830
diff changeset
234 }
0ffea636d6b0 Prepared class break templating mechanism to work with differences, too. Needs an adjusted template.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3830
diff changeset
235
0ffea636d6b0 Prepared class break templating mechanism to work with differences, too. Needs an adjusted template.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3830
diff changeset
236 func templateContourLines(data, configKey string) (string, error) {
3828
885eb90255ff Cleanup templating of styles [WIP].
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3826
diff changeset
237 tmpl, err := template.New("template").Parse(data)
885eb90255ff Cleanup templating of styles [WIP].
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3826
diff changeset
238 if err != nil {
885eb90255ff Cleanup templating of styles [WIP].
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3826
diff changeset
239 return "", err
885eb90255ff Cleanup templating of styles [WIP].
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3826
diff changeset
240 }
885eb90255ff Cleanup templating of styles [WIP].
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3826
diff changeset
241
885eb90255ff Cleanup templating of styles [WIP].
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3826
diff changeset
242 var cb []classBreak
885eb90255ff Cleanup templating of styles [WIP].
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3826
diff changeset
243
3831
0ffea636d6b0 Prepared class break templating mechanism to work with differences, too. Needs an adjusted template.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3830
diff changeset
244 if cb, err = countourLinesClassBreaks(configKey); err != nil {
3828
885eb90255ff Cleanup templating of styles [WIP].
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3826
diff changeset
245 return "", err
885eb90255ff Cleanup templating of styles [WIP].
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3826
diff changeset
246 }
885eb90255ff Cleanup templating of styles [WIP].
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3826
diff changeset
247
885eb90255ff Cleanup templating of styles [WIP].
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3826
diff changeset
248 var buf strings.Builder
885eb90255ff Cleanup templating of styles [WIP].
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3826
diff changeset
249 if err = tmpl.Execute(&buf, cb); err != nil {
885eb90255ff Cleanup templating of styles [WIP].
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3826
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250 return "", err
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251 }
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252 return buf.String(), nil
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253 }
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254
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255 func countourLinesClassBreaks(configKey string) ([]classBreak, error) {
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256
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257 var config string
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258 ctx := context.Background()
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259 if err := auth.RunAs(
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260 ctx,
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261 "sys_admin",
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262 func(conn *sql.Conn) error {
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263 return conn.QueryRowContext(
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264 ctx,
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265 selectClassBreaksSQL,
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266 configKey,
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267 ).Scan(&config)
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268 },
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269 ); err != nil {
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270 return nil, err
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271 }
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272
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273 cc, err := parseColorClasses(config)
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274 if err != nil {
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275 return nil, err
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276 }
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277
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278 return cc.toClassBreaks(), nil
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279 }