Mercurial > gemma

annotate client/src/components/gauge/Waterlevel.vue @ 2648:4ffae834276e

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client: waterlevel diagram: added background grid to chart
author Markus Kottlaender <markus@intevation.de>
date Thu, 14 Mar 2019 14:42:26 +0100
parents 30697735a7bc
children a2dd96c305be
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1 <template>
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2 <div class="flex-fill diagram-container"></div>
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3 </template>
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4
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5 <style lang="sass" scoped>
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6 .diagram-container
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7 /deep/
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8 .line
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9 stroke: steelblue
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10 stroke-width: 2
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11 fill: transparent
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12 clip-path: url(#clip)
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13
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14 .hdc-line,
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15 .ldc-line,
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16 .mw-line
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17 stroke-width: 1
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18 fill: transparent
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19 clip-path: url(#clip)
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20 .hdc-line
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21 stroke: red
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22 .ldc-line
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23 stroke: green
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24 .mw-line
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25 stroke: grey
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26 .ref-waterlevel-label
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27 font-size: 11px
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28 fill: #999
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29 .hdc-ldc-area
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30 fill: rgba(0, 255, 0, 0.15)
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31
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32 .tick
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33 line
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34 stroke-dasharray: 5
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35 stroke: #ccc
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36
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37 .zoom
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38 cursor: move
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39 fill: none
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40 pointer-events: all
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41 .brush
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42 .selection
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43 stroke: transparent
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44 fill-opacity: 0.2
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45 .handle
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46 stroke: rgba($color-info, 0.5)
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47 fill: rgba($color-info, 0.5)
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48 </style>
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49
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50 <script>
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51 /* This is Free Software under GNU Affero General Public License v >= 3.0
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52 * without warranty, see README.md and license for details.
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53 *
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54 * SPDX-License-Identifier: AGPL-3.0-or-later
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55 * License-Filename: LICENSES/AGPL-3.0.txt
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56 *
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57 * Copyright (C) 2018 by via donau
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58 * – Österreichische Wasserstraßen-Gesellschaft mbH
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59 * Software engineering by Intevation GmbH
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60 *
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61 * Author(s):
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62 * Markus Kottländer <markus.kottlaender@intevation.de>
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63 */
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64
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65 import { mapState, mapGetters } from "vuex";
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66 import * as d3 from "d3";
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67 import debounce from "debounce";
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68
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69 export default {
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70 computed: {
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71 ...mapState("gauges", ["waterlevels"]),
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72 ...mapGetters("gauges", ["selectedGauge"])
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73 },
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74 watch: {
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75 waterlevels() {
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76 this.drawDiagram();
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77 }
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78 },
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79 methods: {
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80 drawDiagram() {
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81 if (!this.selectedGauge || !this.waterlevels.length) return;
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82
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83 // remove old diagram
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84 d3.select(".diagram-container svg").remove();
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85
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86 // get HDC/LDC/MW of the gauge
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87 let refWaterLevels = JSON.parse(
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88 this.selectedGauge.properties.reference_water_levels
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89 );
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90
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91 // CREATE SVG AND SET DIMENSIONS/MARGINS
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92
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93 let svgWidth = document.querySelector(".diagram-container").clientWidth;
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94 let svgHeight = document.querySelector(".diagram-container").clientHeight;
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95 let svg = d3
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96 .select(".diagram-container")
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97 .append("svg")
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98 .attr("width", "100%")
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99 .attr("height", "100%");
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100 let mainMargin = { top: 50, right: 20, bottom: 110, left: 80 },
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101 navMargin = {
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102 top: svgHeight - mainMargin.top - 35,
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103 right: 20,
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104 bottom: 30,
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105 left: 80
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106 },
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107 width = +svgWidth - mainMargin.left - mainMargin.right,
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108 mainHeight = +svgHeight - mainMargin.top - mainMargin.bottom,
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109 navHeight = +svgHeight - navMargin.top - navMargin.bottom;
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110
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111 // PREPARING AXES/SCALING
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112
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113 // scaling helpers to convert real values to pixels
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114 // based on the diagrams dimensions
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115 let x = d3.scaleTime().range([0, width]),
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116 x2 = d3.scaleTime().range([0, width]),
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117 y = d3.scaleLinear().range([mainHeight, 0]),
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118 y2 = d3.scaleLinear().range([navHeight, 0]);
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119 // find min/max values for the waterlevel axis
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120 // including hdc/ldc (+/- 100 cm)
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121 let WaterlevelMinMax = d3.extent(
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122 [
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123 ...this.waterlevels,
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124 { waterlevel: refWaterLevels.HDC + 100 },
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125 { waterlevel: Math.max(refWaterLevels.LDC - 100, 0) }
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126 ],
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127 d => d.waterlevel
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128 );
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129 // setting the min and max values for the diagram axes
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130 x.domain(d3.extent(this.waterlevels, d => d.date));
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131 y.domain(WaterlevelMinMax);
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132 x2.domain(x.domain());
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133 y2.domain(y.domain());
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134 // creating the axes based on these scales
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135 let xAxis = d3
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136 .axisTop(x)
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137 .tickSizeInner(mainHeight)
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138 .tickSizeOuter(0);
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139 let xAxis2 = d3.axisBottom(x2);
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140 let yAxis = d3
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141 .axisRight(y)
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142 .tickSizeInner(width)
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143 .tickSizeOuter(0);
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144
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145 // PREPARING CHART FUNCTIONS
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146
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147 // waterlevel line in big chart
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148 let mainLineChart = d3
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149 .line()
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150 .curve(d3.curveMonotoneX)
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151 .x(d => x(d.date))
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152 .y(d => y(d.waterlevel));
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153 // waterlevel line in small chart
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154 let navLineChart = d3
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155 .line()
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156 .curve(d3.curveMonotoneX)
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157 .x(d => x2(d.date))
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158 .y(d => y2(d.waterlevel));
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159 // hdc/ldc/mw
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160 let refWaterlevelLine = d3
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161 .line()
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162 .x(d => x(d.x))
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163 .y(d => y(d.y));
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164
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165 // DRAWING MAINCHART
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166
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167 // define visible chart area
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168 // everything outside this area will be hidden (clipped)
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169 svg
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170 .append("defs")
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171 .append("clipPath")
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172 .attr("id", "clip")
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173 .append("rect")
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174 .attr("width", width)
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175 .attr("height", mainHeight);
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176
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177 let mainChart = svg
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178 .append("g")
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179 .attr("transform", `translate(${mainMargin.left}, ${mainMargin.top})`);
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180
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181 // axes
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182 mainChart
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183 .append("g")
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184 .attr("transform", `translate(0, ${mainHeight})`)
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185 .call(xAxis)
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186 .selectAll(".tick text")
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187 .attr("y", 15);
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188 mainChart // label
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189 .append("text")
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190 .text(this.$gettext("Waterlevel [cm]"))
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191 .attr("text-anchor", "middle")
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192 .attr("transform", `translate(-45, ${mainHeight / 2}) rotate(-90)`);
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193 mainChart
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194 .append("g")
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195 .call(yAxis)
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196 .selectAll(".tick text")
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197 .attr("x", -25);
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198
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199 // reference waterlevels
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200 // filling area between HDC and LDC
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201 mainChart
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202 .append("rect")
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203 .attr("class", "hdc-ldc-area")
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204 .attr("x", 0)
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205 .attr("y", y(refWaterLevels.HDC))
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206 .attr("width", width)
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207 .attr("height", y(refWaterLevels.LDC) - y(refWaterLevels.HDC));
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208
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209 let lastDate = this.waterlevels[this.waterlevels.length - 1].date;
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210 // HDC
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211 mainChart
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212 .append("path")
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213 .datum([
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214 { x: 0, y: refWaterLevels.HDC },
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215 { x: lastDate, y: refWaterLevels.HDC }
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216 ])
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217 .attr("class", "hdc-line")
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218 .attr("d", refWaterlevelLine);
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219 mainChart // label
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220 .append("text")
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221 .text("HDC")
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222 .attr("class", "ref-waterlevel-label")
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223 .attr("x", x(lastDate) - 20)
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224 .attr("y", y(refWaterLevels.HDC) - 3);
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225 // LDC
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226 mainChart
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227 .append("path")
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228 .datum([
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229 { x: 0, y: refWaterLevels.LDC },
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230 { x: lastDate, y: refWaterLevels.LDC }
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231 ])
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232 .attr("class", "ldc-line")
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233 .attr("d", refWaterlevelLine);
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234 mainChart // label
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235 .append("text")
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236 .text("LDC")
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237 .attr("class", "ref-waterlevel-label")
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238 .attr("x", x(lastDate) - 20)
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239 .attr("y", y(refWaterLevels.LDC) - 3);
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240 // MW
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241 mainChart
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242 .append("path")
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243 .datum([
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244 { x: 0, y: refWaterLevels.MW },
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245 { x: lastDate, y: refWaterLevels.MW }
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246 ])
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247 .attr("class", "mw-line")
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248 .attr("d", refWaterlevelLine);
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249 mainChart // label
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250 .append("text")
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251 .text("MW")
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252 .attr("class", "ref-waterlevel-label")
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253 .attr("x", x(lastDate) - 20)
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254 .attr("y", y(refWaterLevels.MW) - 3);
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255
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256 // waterlevel chart
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257 mainChart
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258 .append("path")
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259 .datum(this.waterlevels)
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260 .attr("class", "line")
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261 .attr("d", mainLineChart);
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262
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263 // DRAWING NAVCHART
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264
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265 let navChart = svg
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266 .append("g")
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267 .attr("transform", `translate(${navMargin.left}, ${navMargin.top})`);
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268
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269 // axis (nav chart only has y-axis)
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270 navChart
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271 .append("g")
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272 .attr("class", "axis axis--x")
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273 .attr("transform", `translate(0, ${navHeight})`)
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274 .call(xAxis2);
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275
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276 // waterlevel chart
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277 navChart
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278 .append("path")
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279 .datum(this.waterlevels)
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280 .attr("class", "line")
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281 .attr("d", navLineChart);
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282
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283 // INTERACTIVITY
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284
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285 // selecting time period in nav chart
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286 let brush = d3
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287 .brushX()
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288 .handleSize(4)
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289 .extent([[0, 0], [width, navHeight]])
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290 .on("brush end", () => {
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291 if (d3.event.sourceEvent && d3.event.sourceEvent.type === "zoom")
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292 return; // ignore brush-by-zoom
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293 let s = d3.event.selection || x2.range();
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294 x.domain(s.map(x2.invert, x2));
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295 mainChart.select(".line").attr("d", mainLineChart);
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296 mainChart.select(".axis--x").call(xAxis);
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297 svg
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298 .select(".zoom")
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299 .call(
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300 zoom.transform,
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301 d3.zoomIdentity.scale(width / (s[1] - s[0])).translate(-s[0], 0)
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302 );
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303 });
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304
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305 // zooming with mousewheel in main chart
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306 let zoom = d3
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307 .zoom()
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308 .scaleExtent([1, Infinity])
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309 .translateExtent([[0, 0], [width, mainHeight]])
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310 .extent([[0, 0], [width, mainHeight]])
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311 .on("zoom", () => {
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312 if (d3.event.sourceEvent && d3.event.sourceEvent.type === "brush")
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313 return; // ignore zoom-by-brush
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314 let t = d3.event.transform;
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315 x.domain(t.rescaleX(x2).domain());
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316 mainChart.select(".line").attr("d", mainLineChart);
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317 mainChart.select(".axis--x").call(xAxis);
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318 navChart
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319 .select(".brush")
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320 .call(brush.move, x.range().map(t.invertX, t));
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321 });
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322
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323 navChart
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324 .append("g")
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325 .attr("class", "brush")
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326 .call(brush)
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327 .call(brush.move, x.range());
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328
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329 svg
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330 .append("rect")
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331 .attr("class", "zoom")
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332 .attr("width", width)
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333 .attr("height", mainHeight)
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334 .attr("transform", `translate(${mainMargin.left}, ${mainMargin.top})`)
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335 .call(zoom);
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336 }
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337 },
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338 created() {
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339 window.addEventListener("resize", debounce(this.drawDiagram), 100);
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340 },
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341 mounted() {
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342 this.drawDiagram();
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343 },
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344 updated() {
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345 this.drawDiagram();
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346 }
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347 };
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348 </script>