Mercurial > personal > weather-server
diff weather_server/static/graph.js.map @ 28:f817fa785c93
Make graph only consider visible points when setting range.
| author | Paul Fisher <paul@pfish.zone> |
|---|---|
| date | Sun, 19 Jan 2020 17:05:11 -0500 |
| parents | 47987502bf4c |
| children | beedfa8eaa3f |
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--- a/weather_server/static/graph.js.map Sun Nov 10 23:48:38 2019 -0500 +++ b/weather_server/static/graph.js.map Sun Jan 19 17:05:11 2020 -0500 @@ -1,1 +1,1 @@ 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Converts Celsius to Fahrenheit. */\nexport function cToF(tempC: number): number {\n return tempC * 9 / 5 + 32;\n}\n\nconst MAGNUS_B = 17.62;\nconst MAGNUS_C = 243.12;\n\n/** The gamma function to calculate dew point. */\nfunction gammaFn(tempC: number, rhPct: number): number {\n return Math.log(rhPct / 100) + MAGNUS_B * tempC / (MAGNUS_C + tempC);\n}\n\n/** Calculates the dew point. */\nexport function dewPointC(tempC: any, rhPct: any): number {\n const gamma = gammaFn(tempC, rhPct);\n return MAGNUS_C * gamma / (MAGNUS_B - gamma);\n}\n","import { WeatherResponse } from './apis';\nimport { cToF, dewPointC } from './math';\n\n/** The amount of time we will draw on the graph. */\nconst HISTORY_SECONDS = 60 * 60 * 4;\n/** The amount of buffer room we will request before HISTORY_SECONDS. */\nconst BUFFER_SECONDS = 300;\n\n/**\n * Sets up everything.\n * @param tempElement The element where temperature data is.\n * @param dewPointElement The element where the dew point is.\n */\nexport async function setUp(\n root: HTMLElement,\n tempElement: HTMLElement,\n dewPointElement: HTMLElement) {\n const nowTS = new Date().getTime() / 1000;\n const startTS = nowTS - HISTORY_SECONDS;\n const query = new URL('?', location.href);\n query.pathname = query.pathname + '/recent';\n query.searchParams.set('seconds', String(HISTORY_SECONDS + BUFFER_SECONDS));\n const results = await fetch(query.href);\n if (!results.ok) return;\n const data: WeatherResponse = await results.json();\n const readings = data.readings;\n if (readings.length === 0) return;\n root.classList.remove('plain');\n root.classList.add('fancy');\n\n const tempsF =\n readings.map(s => [s.sample_time, cToF(s.temp_c)] as Point);\n const dewPointsF = readings.map(\n s => [s.sample_time, cToF(dewPointC(s.temp_c, s.rh_pct))] as Point);\n setUpElement(tempElement, [startTS, nowTS], tempsF);\n setUpElement(dewPointElement, [startTS, nowTS], dewPointsF);\n}\n\ntype Point = [number, number];\n\n/**\n * Sets up charting for this element.\n * @param element The element to put a graph in.\n * @param timeRange The `[start, end]` of the time range.\n * @param data The data to chart.\n */\nfunction setUpElement(\n element: HTMLElement, timeRange: [number, number], data: Point[]) {\n if (data.length === 0) return;\n const chart = new Chart(element, timeRange, data);\n chart.resize();\n addEventListener('resize', () => chart.resize());\n}\n\n/** The number of degrees that the graph shows vertically. */\nconst Y_DEGREE_RANGE = 10;\n\nconst LINE_WIDTH_PX = 2;\n\nconst FONT_SIZE = '40px';\n\nclass Chart {\n private readonly canvas: HTMLCanvasElement;\n private readonly unit: string;\n /**\n * Creates a new chart.\n * @param element The parent element to create `<canvas>`-based chart in.\n * @param timeRange `[start, end]` of the range to chart as Unix timestamps.\n * @param data The data to chart.\n */\n constructor(\n private readonly element: HTMLElement,\n private readonly timeRange: [number, number],\n private readonly data: Point[]) {\n this.canvas = document.createElement('canvas');\n this.element.insertBefore(this.canvas, element.firstChild);\n const unit = element.getElementsByClassName('unit')[0];\n this.unit = unit && unit.textContent || '';\n }\n\n resize() {\n const dpr = self.devicePixelRatio || 1;\n const [w, h] = this.size();\n const pxSize: Point = [w * dpr, h * dpr];\n this.canvas.width = pxSize[0];\n this.canvas.height = pxSize[1];\n const ctx = this.canvas.getContext('2d')!;\n ctx.clearRect(0, 0, pxSize[0], pxSize[1]);\n ctx.scale(dpr, dpr);\n this.redraw(ctx);\n }\n\n private redraw(ctx: CanvasRenderingContext2D) {\n const stroke = getComputedStyle(this.element).color!;\n const family = getComputedStyle(this.element).fontFamily!;\n ctx.strokeStyle = stroke;\n ctx.lineJoin = 'round';\n ctx.lineWidth = LINE_WIDTH_PX;\n ctx.font = `bold ${FONT_SIZE} ${family}`;\n\n const yRange = calculateYRange(this.data.map(d => d[1]));\n\n const [fullW, fullH] = this.size();\n const [xPad, yMargin] = this.measureMargin(ctx);\n const graphSize: Point = [fullW - xPad, fullH];\n\n ctx.beginPath();\n for (const pt of this.data) {\n const projected = project(pt, graphSize, this.timeRange, yRange);\n ctx.lineTo(...projected);\n }\n ctx.stroke();\n ctx.beginPath();\n const lastPt = this.data[this.data.length - 1];\n const center = project(lastPt, graphSize, this.timeRange, yRange);\n ctx.ellipse(\n center[0],\n center[1],\n 1.5 * LINE_WIDTH_PX,\n 1.5 * LINE_WIDTH_PX,\n 0,\n 0,\n 2 * Math.PI);\n ctx.fillStyle = getComputedStyle(this.element).backgroundColor!;\n ctx.fill();\n ctx.stroke();\n\n ctx.fillStyle = stroke;\n ctx.textAlign = 'left';\n ctx.textBaseline = 'top';\n ctx.fillText(\n `${niceNumber(lastPt[1])} ${this.unit}`,\n center[0] + 5 * LINE_WIDTH_PX,\n center[1] + yMargin);\n }\n\n private measureMargin(ctx: CanvasRenderingContext2D): [number, number] {\n const bbox = ctx.measureText(`−99 ${this.unit}`);\n const margin =\n 5 * LINE_WIDTH_PX + // margin to text\n 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