Mercurial > gemma
annotate pkg/geoserver/templates.go @ 3841:8e47d6f12998 sld-colors
Merged default into sld-colors branch.
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Mon, 08 Jul 2019 14:34:42 +0200 |
parents | 0ffea636d6b0 |
children | 3fcc4e11fc00 |
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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118 A: 0xff, |
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119 }, true |
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120 } |
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121 m := 1 / (v2 - v1) |
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122 c := -m * v1 |
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123 s := v*m + c |
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124 |
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125 interpolate := func(a, b uint8) uint8 { |
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126 v := math.Round(float64(a) + (float64(b)-float64(a))*s) |
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127 if v < 0 { |
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128 return 0 |
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129 } |
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130 if v > 255 { |
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131 return 255 |
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132 } |
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133 return uint8(v) |
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134 } |
3826
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135 |
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136 return color.RGBA{ |
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137 R: interpolate(cc[i].color.R, cc[i+1].color.R), |
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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), |
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140 A: 0xff, |
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141 }, true |
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142 } |
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143 } |
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144 |
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145 return color.RGBA{}, false |
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146 } |
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147 |
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148 func parseColorClasses(s string) (colorClasses, error) { |
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149 |
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150 var err error |
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151 |
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152 parseFloat := func(s string) float64 { |
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153 var v float64 |
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154 if err == nil { |
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155 v, err = strconv.ParseFloat(s, 64) |
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156 } |
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157 return v |
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158 } |
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159 |
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160 parseColor := func(s string) color.RGBA { |
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161 if err != nil { |
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162 return color.RGBA{} |
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163 } |
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164 s = strings.Map(func(r rune) rune { |
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165 if ('a' <= r && r <= 'f') || ('0' <= r && r <= '9') { |
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166 return r |
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167 } |
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168 return -1 |
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169 }, strings.ToLower(s)) |
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170 |
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171 var v int64 |
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172 v, err = strconv.ParseInt(s, 16, 64) |
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173 return color.RGBA{ |
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174 R: uint8(v >> 16), |
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175 G: uint8(v >> 8), |
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176 B: uint8(v >> 0), |
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177 A: 0xff, |
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178 } |
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179 } |
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180 |
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181 lines := strings.Split(s, ",") |
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182 |
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183 // first pass: find defined colors |
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184 var defined colorClasses |
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185 |
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186 for _, line := range lines { |
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187 // ignore the lines w/o a color. |
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188 if !strings.ContainsRune(line, ':') { |
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189 continue |
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190 } |
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191 parts := strings.SplitN(line, ":", 2) |
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192 if len(parts) < 2 { |
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193 continue |
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194 } |
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195 value := parseFloat(parts[0]) |
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196 color := parseColor(parts[1]) |
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197 |
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198 defined = append(defined, colorClass{ |
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199 value: value, |
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200 color: color, |
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201 }) |
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202 } |
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203 |
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204 if err != nil { |
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205 return nil, err |
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206 } |
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207 |
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208 sort.Slice(defined, func(i, j int) bool { |
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209 return defined[i].value < defined[j].value |
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210 }) |
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211 |
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212 // second pass: interpolate the rest |
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213 var final colorClasses |
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214 for _, line := range lines { |
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215 if idx := strings.IndexRune(line, ':'); idx >= 0 { |
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216 line = line[:idx] |
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217 } |
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218 value := parseFloat(line) |
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219 if color, ok := defined.interpolate(value); ok { |
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220 final = append(final, colorClass{ |
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221 value: value, |
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222 color: color, |
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223 }) |
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224 } |
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225 } |
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226 |
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227 return final, err |
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228 } |
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229 |
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230 func templateContourLinesFunc(configKey string) func(string) (string, error) { |
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231 return func(data string) (string, error) { |
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232 return templateContourLines(data, configKey) |
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233 } |
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234 } |
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235 |
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236 func templateContourLines(data, configKey string) (string, error) { |
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237 tmpl, err := template.New("template").Parse(data) |
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238 if err != nil { |
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239 return "", err |
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240 } |
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241 |
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242 var cb []classBreak |
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243 |
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244 if cb, err = countourLinesClassBreaks(configKey); err != nil { |
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245 return "", err |
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246 } |
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247 |
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248 var buf strings.Builder |
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249 if err = tmpl.Execute(&buf, cb); err != nil { |
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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 } |