Mercurial > personal > weather-server

annotate weather_server/static/graph.js @ 32:2faf3499a226

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Ignore lots of development miscellany.
author Paul Fisher <paul@pfish.zone>
date Sat, 12 Jun 2021 18:43:49 +0000
parents f817fa785c93
children beedfa8eaa3f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
19
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1 var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
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2 function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
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3 return new (P || (P = Promise))(function (resolve, reject) {
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4 function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
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5 function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
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6 function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
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7 step((generator = generator.apply(thisArg, _arguments || [])).next());
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8 });
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9 };
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10 define("math", ["require", "exports"], function (require, exports) {
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11 "use strict";
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12 Object.defineProperty(exports, "__esModule", { value: true });
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13 function cToF(tempC) {
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14 return tempC * 9 / 5 + 32;
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15 }
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16 exports.cToF = cToF;
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17 const MAGNUS_B = 17.62;
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18 const MAGNUS_C = 243.12;
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19 function gammaFn(tempC, rhPct) {
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20 return Math.log(rhPct / 100) + MAGNUS_B * tempC / (MAGNUS_C + tempC);
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21 }
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22 function dewPointC(tempC, rhPct) {
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23 const gamma = gammaFn(tempC, rhPct);
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24 return MAGNUS_C * gamma / (MAGNUS_B - gamma);
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25 }
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26 exports.dewPointC = dewPointC;
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27 });
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28 define("graph", ["require", "exports", "math"], function (require, exports, math_1) {
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29 "use strict";
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30 Object.defineProperty(exports, "__esModule", { value: true });
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31 const HISTORY_SECONDS = 60 * 60 * 4;
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32 const BUFFER_SECONDS = 300;
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33 function setUp(root, tempElement, dewPointElement) {
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34 return __awaiter(this, void 0, void 0, function* () {
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35 const nowTS = new Date().getTime() / 1000;
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36 const startTS = nowTS - HISTORY_SECONDS;
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37 const query = new URL('?', location.href);
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38 query.pathname = query.pathname + '/recent';
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39 query.searchParams.set('seconds', String(HISTORY_SECONDS + BUFFER_SECONDS));
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40 const results = yield fetch(query.href);
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41 if (!results.ok)
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42 return;
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43 const data = yield results.json();
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44 const readings = data.readings;
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45 if (readings.length === 0)
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46 return;
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47 root.classList.remove('plain');
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48 root.classList.add('fancy');
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49 const tempsF = readings.map(s => [s.sample_time, math_1.cToF(s.temp_c)]);
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50 const dewPointsF = readings.map(s => [s.sample_time, math_1.cToF(math_1.dewPointC(s.temp_c, s.rh_pct))]);
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51 setUpElement(tempElement, [startTS, nowTS], tempsF);
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52 setUpElement(dewPointElement, [startTS, nowTS], dewPointsF);
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53 });
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54 }
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55 exports.setUp = setUp;
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56 function setUpElement(element, timeRange, data) {
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57 if (data.length === 0)
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58 return;
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59 const chart = new Chart(element, timeRange, data);
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60 chart.resize();
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61 addEventListener('resize', () => chart.resize());
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62 }
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63 const Y_DEGREE_RANGE = 10;
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64 const LINE_WIDTH_PX = 2;
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65 const FONT_SIZE = '40px';
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66 class Chart {
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67 constructor(element, timeRange, data) {
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68 this.element = element;
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69 this.timeRange = timeRange;
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70 this.data = data;
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71 this.canvas = document.createElement('canvas');
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72 this.element.insertBefore(this.canvas, element.firstChild);
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73 const unit = element.getElementsByClassName('unit')[0];
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74 this.unit = unit && unit.textContent || '';
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75 }
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76 resize() {
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77 const dpr = self.devicePixelRatio || 1;
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78 const [w, h] = this.size();
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79 const pxSize = [w * dpr, h * dpr];
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80 this.canvas.width = pxSize[0];
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81 this.canvas.height = pxSize[1];
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82 const ctx = this.canvas.getContext('2d');
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83 ctx.clearRect(0, 0, pxSize[0], pxSize[1]);
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84 ctx.scale(dpr, dpr);
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85 this.redraw(ctx);
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86 }
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87 redraw(ctx) {
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88 const stroke = getComputedStyle(this.element).color;
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89 const family = getComputedStyle(this.element).fontFamily;
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90 ctx.strokeStyle = stroke;
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91 ctx.lineJoin = 'round';
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92 ctx.lineWidth = LINE_WIDTH_PX;
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93 ctx.font = `bold ${FONT_SIZE} ${family}`;
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94 const onScreenData = this.data.filter(([time, _]) => this.timeRange[0] <= time);
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95 const yRange = calculateYRange(onScreenData.map(d => d[1]));
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96 const [fullW, fullH] = this.size();
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97 const [xPad, yMargin] = this.measureMargin(ctx);
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98 const graphSize = [fullW - xPad, fullH];
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99 ctx.beginPath();
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100 for (const pt of this.data) {
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101 const projected = project(pt, graphSize, this.timeRange, yRange);
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102 ctx.lineTo(...projected);
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103 }
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104 ctx.stroke();
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105 ctx.beginPath();
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106 const lastPt = this.data[this.data.length - 1];
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107 const center = project(lastPt, graphSize, this.timeRange, yRange);
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108 ctx.ellipse(center[0], center[1], 1.5 * LINE_WIDTH_PX, 1.5 * LINE_WIDTH_PX, 0, 0, 2 * Math.PI);
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109 ctx.fillStyle = getComputedStyle(this.element).backgroundColor;
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110 ctx.fill();
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111 ctx.stroke();
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112 ctx.fillStyle = stroke;
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113 ctx.textAlign = 'left';
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114 ctx.textBaseline = 'top';
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115 ctx.fillText(`${niceNumber(lastPt[1])} ${this.unit}`, center[0] + 5 * LINE_WIDTH_PX, center[1] + yMargin);
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116 }
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117 measureMargin(ctx) {
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118 const bbox = ctx.measureText(`−99 ${this.unit}`);
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119 const margin = 5 * LINE_WIDTH_PX +
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120 bbox.width +
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121 16;
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122 return [margin, -31.5 / 2];
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123 }
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124 size() {
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125 const cssSize = this.element.getBoundingClientRect();
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126 return [cssSize.width, cssSize.height];
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127 }
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128 }
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129 function niceNumber(n) {
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130 return Math.round(n).toLocaleString('en-us').replace('-', '−');
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131 }
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132 const EDGE_FRACTION = 0.125;
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133 function calculateYRange(ys) {
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134 const yMax = Math.max(...ys);
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135 const yMin = Math.min(...ys);
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136 const yMid = (yMin + yMax) / 2;
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137 const lastY = ys[ys.length - 1];
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138 const yLo = yMid - Y_DEGREE_RANGE / 2;
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139 const yProportion = Math.max(Math.min((lastY - yLo) / Y_DEGREE_RANGE, 1 - EDGE_FRACTION), EDGE_FRACTION);
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140 const rangeLo = lastY - yProportion * Y_DEGREE_RANGE;
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141 return [rangeLo, rangeLo + Y_DEGREE_RANGE];
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142 }
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143 function project(coord, size, xRange, yRange) {
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144 const [x, y] = coord;
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145 const [xMin, xMax] = xRange;
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146 const xSpan = xMax - xMin;
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147 const [yMin, yMax] = yRange;
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148 const ySpan = yMax - yMin;
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149 const [xSize, ySize] = size;
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150 return [
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151 (x - xMin) / xSpan * xSize,
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152 (yMax - y) / ySpan * ySize,
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153 ];
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154 }
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155 });
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156 //# sourceMappingURL=graph.js.map