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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 = 12;\n\nconst LINE_WIDTH_PX = 2;\nconst GRID_WIDTH_PX = 0.5;\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        private readonly timezone?: string) {\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        ctx.strokeStyle = this.stroke();\n        ctx.lineJoin = 'round';\n        ctx.lineWidth = LINE_WIDTH_PX;\n        ctx.font = `bold ${FONT_SIZE} ${this.font()}`;\n\n        const onScreenData = this.data.filter(\n            ([time, _]) => this.timeRange[0] <= time);\n\n        const yRange = calculateYRange(onScreenData.map(d => d[1]));\n\n        const [fullW, fullH] = this.size();\n        const [xPad, yMargin] = this.measureMargin(ctx);\n        const graphSize: Point = [fullW - xPad, fullH];\n\n        ctx.beginPath();\n        for (const pt of this.data) {\n            const projected = project(pt, graphSize, this.timeRange, yRange);\n            ctx.lineTo(...projected);\n        }\n        ctx.stroke();\n        ctx.beginPath();\n        const lastPt = this.data[this.data.length - 1];\n        const center = project(lastPt, graphSize, this.timeRange, yRange);\n        ctx.ellipse(\n            center[0],\n            center[1],\n            1.5 * LINE_WIDTH_PX,\n            1.5 * LINE_WIDTH_PX,\n            0,\n            0,\n            2 * Math.PI);\n        ctx.fillStyle = getComputedStyle(this.element).backgroundColor!;\n        ctx.fill();\n        ctx.stroke();\n\n        this.drawGrid(ctx, graphSize, yRange);\n\n        ctx.fillStyle = this.stroke();\n        ctx.textAlign = 'left';\n        ctx.textBaseline = 'top';\n        ctx.fillText(\n            `${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            bbox.width +  // max (?) width of text\n            16;  // Pixel margin to wall.\n        return [margin, -31.5 / 2];\n    }\n\n    private drawGrid(\n        ctx: CanvasRenderingContext2D,\n        size: Point,\n        yRange: [number, number],\n    ) {\n        ctx.save();\n        ctx.lineCap = 'butt';\n        ctx.lineWidth = GRID_WIDTH_PX;\n\n        this.drawTime(ctx, size);\n        this.drawTemps(ctx, size, yRange);\n\n        ctx.restore();\n    }\n\n    private drawTime(ctx: CanvasRenderingContext2D, [w, h]: Point): void {\n        const minutes = minutesOf(this.timeRange, this.timezone);\n        for (const [ts, hhmm] of minutes) {\n            const mins = Number(hhmm.split(':')[1]);\n            let opacity: number;\n            if (mins === 0) {\n                opacity = 1;\n            } else if (mins % 15 === 0) {\n                opacity = 0.5;\n            } else {\n                continue;\n            }\n            const x = project1D(ts, w, this.timeRange);\n            ctx.save();\n            ctx.globalAlpha = opacity;\n            ctx.beginPath();\n            ctx.moveTo(x, 0);\n            ctx.lineTo(x, h);\n            ctx.stroke();\n            ctx.restore();\n        }\n    }\n\n    private drawTemps(ctx: CanvasRenderingContext2D, [w, h]: Point, [yLo, yHi]: [number, number]): void {\n        const lo = Math.floor(yLo);\n        for (let deg = lo; deg < yHi; deg++) {\n            const ones = deg % 10;\n            let opacity: number;\n            if (ones === 0) {\n                opacity = 1;\n            } else if (ones === 5) {\n                opacity = 0.5;\n            } else {\n                opacity = 0.15;\n            }\n            const y = project1D(deg, h, [yHi, yLo]);\n            ctx.save();\n            ctx.globalAlpha = opacity;\n            ctx.beginPath();\n            ctx.moveTo(0, y);\n            ctx.lineTo(w, y);\n            ctx.stroke();\n            ctx.restore();\n        }\n    }\n\n    private size(): Point {\n        const cssSize = this.element.getBoundingClientRect();\n        return [cssSize.width, cssSize.height];\n    }\n\n    private stroke() {\n        return getComputedStyle(this.element).color;\n    }\n\n    private font() {\n        return getComputedStyle(this.element).fontFamily;\n    }\n}\n\nfunction niceNumber(n: number) {\n    return Math.floor(n).toLocaleString('en-us').replace('-', '−');\n}\n\n/** The closest that the last point will be allowed to get to the edge. */\nconst EDGE_FRACTION = 0.125;\n\n/**\n * Determines what the Y range of the chart should be.\n * @param ys The Y values of the chart.\n * @return The lowest and highest values of the range.\n */\nfunction calculateYRange(ys: number[]): [number, number] {\n    const yMax = Math.max(...ys);\n    const yMin = Math.min(...ys);\n    const yMid = (yMin + yMax) / 2;\n    const lastY = ys[ys.length - 1];\n    const yLo = yMid - Y_DEGREE_RANGE / 2;\n    const yProportion = Math.max(\n        Math.min((lastY - yLo) / Y_DEGREE_RANGE, 1 - EDGE_FRACTION),\n        EDGE_FRACTION);\n    const rangeLo = lastY - yProportion * Y_DEGREE_RANGE;\n    return [rangeLo, rangeLo + Y_DEGREE_RANGE];\n}\n\n/**\n * Projects a Cartesian coordinate into Canvas space.\n *\n * @param coord The `[x, y]` coordinate to project.\n * @param size The `[width, height]` of the context.\n * @param xRange The range of X values in the context.\n * @param yRange The range of Y values in the context.\n * @return The `[x, y]` coordinate in Canvas space.\n */\nfunction project(\n    coord: Point,\n    size: Point,\n    xRange: [number, number],\n    yRange: [number, number],\n): Point {\n    const [x, y] = coord;\n    // Canvas coordinates are upside-down, so we invert the Y range.\n    const [yMax, yMin] = yRange;\n    const [xSize, ySize] = size;\n    return [\n        project1D(x, xSize, xRange),\n        project1D(y, ySize, [yMin, yMax]),\n    ];\n}\n\nfunction project1D(coord: number, size: number, range: [number, number]): number {\n    const [min, max] = range;\n    const span = max - min;\n    return (coord - min) / span * size;\n}\n\nconst MINUTE = 60;\n\n/**\n * Produces a list of every minute in the graph, in the form of\n * `[unix time, \"HH:MM\"][]`.\n * @param start The Unix start time.\n * @param end The Unix end time.\n * @param zone The timezone name.\n */\nfunction minutesOf(\n    [start, end]: [number, number], zone?: string): Array<[number, string]> {\n    const formatter = new Intl.DateTimeFormat(\n        'sv', {timeZone: zone, hour: '2-digit', minute: '2-digit'})\n    const startSeconds = MINUTE * Math.floor(start / MINUTE);\n    const result: Array<[number, string]> = [];\n    for (let t = startSeconds; t <= end; t += MINUTE) {\n        result.push([t, goodBitsOnly(formatter.format(new Date(t * 1000)))])\n    }\n    return result;\n}\n\n\n/** Takes all the special characters out of the given datetime string. */\nfunction goodBitsOnly(s: string): string {\n    return s.replace(/[^0-9 :-]/, '');\n}\n"]}