@nova-ui/charts
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Nova Charts is a library created to provide potential consumers with solutions for various data visualizations that conform with the Nova Design Language. It's designed to solve common patterns identified by UX designers, but also be very flexible so that
186 lines • 28.8 kB
JavaScript
// © 2022 SolarWinds Worldwide, LLC. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
import { scaleBand } from "d3-scale";
import isEqual from "lodash/isEqual";
import moment, { duration } from "moment/moment";
import { BAND_CENTER } from "./constants";
import { datetimeFormatter } from "./formatters/datetime-formatter";
import { TimeScale } from "./time-scale";
import { EMPTY_CONTINUOUS_DOMAIN } from "./types";
// algorithm found here: https://stackoverflow.com/a/30280636/5108336
export function isDaylightSavingTime(d) {
const jan = new Date(d.getFullYear(), 0, 1).getTimezoneOffset();
const jul = new Date(d.getFullYear(), 6, 1).getTimezoneOffset();
return Math.max(jan, jul) !== d.getTimezoneOffset();
}
/**
* Scale designed to support regular interval based data.
*/
export class TimeIntervalScale extends TimeScale {
_bandScale;
_interval;
constructor(interval, id) {
super(id);
this.interval(interval);
this._bandScale = scaleBand();
this.formatters.title = this.defaultTitleFormatter;
}
interval(value) {
if (value) {
this._interval = value;
return this;
}
return this._interval;
}
domain(domain) {
if (domain) {
if (domain.length === 0 || domain.length % 2 !== 0) {
throw new Error("TimeIntervalScale domain has to be defined as a pair of [from, to] time values.");
}
const isDomainEmpty = isEqual(domain, EMPTY_CONTINUOUS_DOMAIN);
const bands = [];
// only try to determine bands if the domain is not empty
if (!isDomainEmpty) {
for (let i = 0; i + 1 < domain.length; i += 2) {
bands.push(...this.getBandsForInterval(domain[i], domain[i + 1]));
}
}
this._bandScale.domain(bands);
// maintain the same domain if it's empty
const d = isDomainEmpty
? domain
: [domain[0], moment(domain[1]).add(this.interval()).toDate()];
return super.domain(d);
}
return super.domain();
}
range(range) {
if (range) {
this._bandScale.range(range);
}
else {
return super.range();
}
return super.range(range);
}
getBands() {
return this._bandScale.domain();
}
convert(value, position = BAND_CENTER) {
const truncatedDate = this.truncToInterval(value, this.interval());
if (!truncatedDate) {
throw new Error("Could not convert interval");
}
const bandValue = this._bandScale(truncatedDate);
if (typeof bandValue === "number") {
return bandValue + position * this.bandwidth();
}
return super.convert(value);
}
/**
* Converts the specified coordinate into the value of the closest band data point
*
* @param {number} coordinate The coordinate to convert
* @returns {string} The value of the closest band data point
*/
invert(coordinate) {
const exactTime = super.invert(coordinate);
return this.truncToInterval(exactTime, this.interval());
}
bandwidth() {
return this._bandScale.bandwidth();
}
truncToInterval(datetime, interval, isDomainChange = false) {
if (!datetime) {
return datetime;
}
const isDst = isDaylightSavingTime(datetime);
const isDomainStartDst = isDomainChange
? isDst
: isDaylightSavingTime(this.domain()[0]);
const isTransFromDst = isDomainStartDst && !isDst;
const isTransToDst = !isDomainStartDst && isDst;
const intervalDays = this.interval().asDays();
const transToDstAdjustment = intervalDays >= 1 && isTransToDst
? duration(1, "hour").asMilliseconds()
: 0;
const adjustedDt = new Date(datetime.getTime() + transToDstAdjustment);
let standardTimeOffsetMinutes = 0;
if (isTransFromDst || isTransToDst) {
standardTimeOffsetMinutes = isTransFromDst ? -60 : 60;
}
const timeZoneOffsetMs = (adjustedDt.getTimezoneOffset() + standardTimeOffsetMinutes) *
60000;
const timestamp = adjustedDt.getTime() - timeZoneOffsetMs;
const intervalMs = interval.asMilliseconds();
const remainder = timestamp % intervalMs;
if (remainder === 0) {
return adjustedDt;
}
// round to interval
const truncatedTimestamp = timestamp - remainder;
return new Date(truncatedTimestamp + timeZoneOffsetMs);
}
isContinuous() {
return true;
}
defaultTitleFormatter = (inputDate) => {
const intervalDays = this.interval().asDays();
const isDst = isDaylightSavingTime(inputDate);
const isDomainStartDst = isDaylightSavingTime(this.domain()[0]);
const isTransFromDst = !isDst && isDomainStartDst;
const isTransToDst = isDst && !isDomainStartDst;
let standardTimeOffsetMs = 0;
if ((isTransFromDst || isTransToDst) && intervalDays >= 1) {
// if transitioning from/to daylight saving time and interval >= 1 day, add/subtract an hour to/from
// the time to format the day as "mmm d" instead of "11:00pm" or "1:00am" respectively
standardTimeOffsetMs = isTransFromDst ? 3600000 : -3600000;
}
const adjustedDate = new Date(inputDate.getTime() + standardTimeOffsetMs);
const endDate = intervalDays >= 1
? moment(adjustedDate).add(intervalDays, "days").toDate()
: moment(adjustedDate).add(this.interval()).toDate();
return (datetimeFormatter(adjustedDate) + " - " + datetimeFormatter(endDate));
};
getBandsForInterval(from, to) {
const bands = [];
let bandDate = this.truncToInterval(from, this.interval(), true);
if (!bandDate) {
throw new Error("Could not get bands for interval");
}
const intervalMs = this.interval().asMilliseconds();
const intervalDays = this.interval().asDays();
const isDomainStartDst = isDaylightSavingTime(from);
const isDomainEndDst = isDaylightSavingTime(to);
// Add one hour to the "to" date if:
// 1) we're transitioning to daylight saving time and 2) the interval is >= one day.
// This ensures that the last day in the domain, which starts an hour later, is included in the generated bands.
const dstAdjustment = !isDomainStartDst && isDomainEndDst
? duration(1, "hour").asMilliseconds()
: 0;
const adjustedToDate = intervalDays >= 1 ? new Date(to.getTime() + dstAdjustment) : to;
while (bandDate <= adjustedToDate) {
bands.push(bandDate);
bandDate = new Date(bandDate.getTime() + intervalMs);
}
return bands;
}
}
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© 2022 SolarWinds Worldwide, LLC. All rights reserved.\n//\n// Permission is hereby granted, free of charge, to any person obtaining a copy\n//  of this software and associated documentation files (the \"Software\"), to\n//  deal in the Software without restriction, including without limitation the\n//  rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n//  sell copies of the Software, and to permit persons to whom the Software is\n//  furnished to do so, subject to the following conditions:\n//\n// The above copyright notice and this permission notice shall be included in\n//  all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\n//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\n//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN\n//  THE SOFTWARE.\n\nimport { ScaleBand, scaleBand } from \"d3-scale\";\nimport isEqual from \"lodash/isEqual\";\nimport moment, { duration, Duration } from \"moment/moment\";\n\nimport { BAND_CENTER } from \"./constants\";\nimport { datetimeFormatter } from \"./formatters/datetime-formatter\";\nimport { TimeScale } from \"./time-scale\";\nimport { EMPTY_CONTINUOUS_DOMAIN, IBandScale } from \"./types\";\n\n// algorithm found here: https://stackoverflow.com/a/30280636/5108336\nexport function isDaylightSavingTime(d: Date): boolean {\n    const jan = new Date(d.getFullYear(), 0, 1).getTimezoneOffset();\n    const jul = new Date(d.getFullYear(), 6, 1).getTimezoneOffset();\n    return Math.max(jan, jul) !== d.getTimezoneOffset();\n}\n\n/**\n * Scale designed to support regular interval based data.\n */\nexport class TimeIntervalScale extends TimeScale implements IBandScale<Date> {\n    private _bandScale: ScaleBand<Date>;\n    private _interval: Duration;\n\n    constructor(interval: Duration, id?: string) {\n        super(id);\n\n        this.interval(interval);\n\n        this._bandScale = scaleBand<Date>();\n\n        this.formatters.title = this.defaultTitleFormatter;\n    }\n\n    public interval(): Duration;\n    public interval(value: Duration): TimeIntervalScale;\n    public interval(value?: Duration): Duration | TimeIntervalScale {\n        if (value) {\n            this._interval = value;\n            return this;\n        }\n        return this._interval;\n    }\n\n    public domain(domain?: Date[]): any {\n        if (domain) {\n            if (domain.length === 0 || domain.length % 2 !== 0) {\n                throw new Error(\n                    \"TimeIntervalScale domain has to be defined as a pair of [from, to] time values.\"\n                );\n            }\n\n            const isDomainEmpty = isEqual(domain, EMPTY_CONTINUOUS_DOMAIN);\n            const bands: Date[] = [];\n            // only try to determine bands if the domain is not empty\n            if (!isDomainEmpty) {\n                for (let i = 0; i + 1 < domain.length; i += 2) {\n                    bands.push(\n                        ...this.getBandsForInterval(domain[i], domain[i + 1])\n                    );\n                }\n            }\n            this._bandScale.domain(bands);\n\n            // maintain the same domain if it's empty\n            const d = isDomainEmpty\n                ? domain\n                : [domain[0], moment(domain[1]).add(this.interval()).toDate()];\n            return super.domain(d);\n        }\n        return super.domain();\n    }\n\n    public range(range?: [number, number]): any {\n        if (range) {\n            this._bandScale.range(range);\n        } else {\n            return super.range();\n        }\n        return super.range(range);\n    }\n\n    public getBands(): Date[] {\n        return this._bandScale.domain();\n    }\n\n    public convert(value: Date, position: number = BAND_CENTER): number {\n        const truncatedDate: Date | undefined = this.truncToInterval(\n            value,\n            this.interval()\n        );\n        if (!truncatedDate) {\n            throw new Error(\"Could not convert interval\");\n        }\n        const bandValue = this._bandScale(truncatedDate);\n        if (typeof bandValue === \"number\") {\n            return bandValue + position * this.bandwidth();\n        }\n        return super.convert(value);\n    }\n\n    /**\n     * Converts the specified coordinate into the value of the closest band data point\n     *\n     * @param {number} coordinate The coordinate to convert\n     * @returns {string} The value of the closest band data point\n     */\n    public invert(coordinate: number): Date | undefined {\n        const exactTime = super.invert(coordinate);\n        return this.truncToInterval(exactTime, this.interval());\n    }\n\n    public bandwidth(): number {\n        return this._bandScale.bandwidth();\n    }\n\n    public truncToInterval(\n        datetime: Date | undefined,\n        interval: Duration,\n        isDomainChange = false\n    ): Date | undefined {\n        if (!datetime) {\n            return datetime;\n        }\n\n        const isDst = isDaylightSavingTime(datetime);\n        const isDomainStartDst = isDomainChange\n            ? isDst\n            : isDaylightSavingTime(this.domain()[0]);\n\n        const isTransFromDst = isDomainStartDst && !isDst;\n        const isTransToDst = !isDomainStartDst && isDst;\n\n        const intervalDays = this.interval().asDays();\n        const transToDstAdjustment =\n            intervalDays >= 1 && isTransToDst\n                ? duration(1, \"hour\").asMilliseconds()\n                : 0;\n        const adjustedDt = new Date(datetime.getTime() + transToDstAdjustment);\n\n        let standardTimeOffsetMinutes = 0;\n        if (isTransFromDst || isTransToDst) {\n            standardTimeOffsetMinutes = isTransFromDst ? -60 : 60;\n        }\n\n        const timeZoneOffsetMs =\n            (adjustedDt.getTimezoneOffset() + standardTimeOffsetMinutes) *\n            60000;\n        const timestamp = adjustedDt.getTime() - timeZoneOffsetMs;\n        const intervalMs = interval.asMilliseconds();\n        const remainder = timestamp % intervalMs;\n\n        if (remainder === 0) {\n            return adjustedDt;\n        }\n\n        // round to interval\n        const truncatedTimestamp = timestamp - remainder;\n\n        return new Date(truncatedTimestamp + timeZoneOffsetMs);\n    }\n\n    public isContinuous(): boolean {\n        return true;\n    }\n\n    public defaultTitleFormatter = (inputDate: Date): string => {\n        const intervalDays = this.interval().asDays();\n        const isDst = isDaylightSavingTime(inputDate);\n        const isDomainStartDst = isDaylightSavingTime(this.domain()[0]);\n\n        const isTransFromDst = !isDst && isDomainStartDst;\n        const isTransToDst = isDst && !isDomainStartDst;\n\n        let standardTimeOffsetMs = 0;\n        if ((isTransFromDst || isTransToDst) && intervalDays >= 1) {\n            // if transitioning from/to daylight saving time and interval >= 1 day, add/subtract an hour to/from\n            // the time to format the day as \"mmm d\" instead of \"11:00pm\" or \"1:00am\" respectively\n            standardTimeOffsetMs = isTransFromDst ? 3600000 : -3600000;\n        }\n        const adjustedDate = new Date(\n            inputDate.getTime() + standardTimeOffsetMs\n        );\n        const endDate =\n            intervalDays >= 1\n                ? moment(adjustedDate).add(intervalDays, \"days\").toDate()\n                : moment(adjustedDate).add(this.interval()).toDate();\n        return (\n            datetimeFormatter(adjustedDate) + \" - \" + datetimeFormatter(endDate)\n        );\n    };\n\n    private getBandsForInterval(from: Date, to: Date): Date[] {\n        const bands: Date[] = [];\n        let bandDate = this.truncToInterval(from, this.interval(), true);\n        if (!bandDate) {\n            throw new Error(\"Could not get bands for interval\");\n        }\n\n        const intervalMs = this.interval().asMilliseconds();\n        const intervalDays = this.interval().asDays();\n        const isDomainStartDst = isDaylightSavingTime(from);\n        const isDomainEndDst = isDaylightSavingTime(to);\n\n        // Add one hour to the \"to\" date if:\n        // 1) we're transitioning to daylight saving time and 2) the interval is >= one day.\n        // This ensures that the last day in the domain, which starts an hour later, is included in the generated bands.\n        const dstAdjustment =\n            !isDomainStartDst && isDomainEndDst\n                ? duration(1, \"hour\").asMilliseconds()\n                : 0;\n        const adjustedToDate =\n            intervalDays >= 1 ? new Date(to.getTime() + dstAdjustment) : to;\n\n        while (bandDate <= adjustedToDate) {\n            bands.push(bandDate);\n            bandDate = new Date(bandDate.getTime() + intervalMs);\n        }\n        return bands;\n    }\n}\n"]}