gpx.studio/website/src/lib/utils.ts

import { type ClassValue, clsx } from "clsx";
import { twMerge } from "tailwind-merge";
import { cubicOut } from "svelte/easing";
import type { TransitionConfig } from "svelte/transition";
import { get } from "svelte/store";
import { map } from "./stores";
import { base } from "$app/paths";
import { browser } from "$app/environment";
import { languages } from "$lib/languages";
import { locale } from "svelte-i18n";
import type mapboxgl from "mapbox-gl";
import { type TrackPoint, type Coordinates, crossarcDistance } from "gpx";

export function cn(...inputs: ClassValue[]) {
    return twMerge(clsx(inputs));
}

type FlyAndScaleParams = {
    y?: number;
    x?: number;
    start?: number;
    duration?: number;
};

export const flyAndScale = (
    node: Element,
    params: FlyAndScaleParams = { y: -8, x: 0, start: 0.95, duration: 150 }
): TransitionConfig => {
    const style = getComputedStyle(node);
    const transform = style.transform === "none" ? "" : style.transform;

    const scaleConversion = (
        valueA: number,
        scaleA: [number, number],
        scaleB: [number, number]
    ) => {
        const [minA, maxA] = scaleA;
        const [minB, maxB] = scaleB;

        const percentage = (valueA - minA) / (maxA - minA);
        const valueB = percentage * (maxB - minB) + minB;

        return valueB;
    };

    const styleToString = (
        style: Record<string, number | string | undefined>
    ): string => {
        return Object.keys(style).reduce((str, key) => {
            if (style[key] === undefined) return str;
            return str + `${key}:${style[key]};`;
        }, "");
    };

    return {
        duration: params.duration ?? 200,
        delay: 0,
        css: (t) => {
            const y = scaleConversion(t, [0, 1], [params.y ?? 5, 0]);
            const x = scaleConversion(t, [0, 1], [params.x ?? 0, 0]);
            const scale = scaleConversion(t, [0, 1], [params.start ?? 0.95, 1]);

            return styleToString({
                transform: `${transform} translate3d(${x}px, ${y}px, 0) scale(${scale})`,
                opacity: t
            });
        },
        easing: cubicOut
    };
};

export function getClosestLinePoint(points: TrackPoint[], point: TrackPoint | Coordinates, details: any = {}): TrackPoint {
    let closest = points[0];
    let closestDist = Number.MAX_VALUE;
    for (let i = 0; i < points.length - 1; i++) {
        let dist = crossarcDistance(points[i], points[i + 1], point);
        if (dist < closestDist) {
            closest = points[i];
            closestDist = dist;
        }
    }
    details['distance'] = closestDist;
    return closest;
}

export function getElevation(map: mapboxgl.Map, coordinates: Coordinates): number {
    let elevation = map.queryTerrainElevation(coordinates, { exaggerated: false });
    return elevation === null ? 0 : elevation;
}

let previousCursors: string[] = [];
export function setCursor(cursor: string) {
    let m = get(map);
    if (m) {
        previousCursors.push(m.getCanvas().style.cursor);
        m.getCanvas().style.cursor = cursor;
    }
}

export function resetCursor() {
    let m = get(map);
    if (m) {
        m.getCanvas().style.cursor = previousCursors.pop() ?? '';
    }
}

export function setPointerCursor() {
    setCursor('pointer');
}

export function setGrabbingCursor() {
    setCursor('grabbing');
}

export function setCrosshairCursor() {
    setCursor('crosshair');
}

export const scissorsCursor = `url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" version="1.1"><path d="M 3.200 3.200 C 0.441 5.959, 2.384 9.516, 7 10.154 C 10.466 10.634, 10.187 13.359, 6.607 13.990 C 2.934 14.637, 1.078 17.314, 2.612 19.750 C 4.899 23.380, 10 21.935, 10 17.657 C 10 16.445, 12.405 13.128, 15.693 9.805 C 18.824 6.641, 21.066 3.732, 20.674 3.341 C 20.283 2.950, 18.212 4.340, 16.072 6.430 C 12.019 10.388, 10 10.458, 10 6.641 C 10 2.602, 5.882 0.518, 3.200 3.200 M 4.446 5.087 C 3.416 6.755, 5.733 8.667, 7.113 7.287 C 8.267 6.133, 7.545 4, 6 4 C 5.515 4, 4.816 4.489, 4.446 5.087 M 14 14.813 C 14 16.187, 19.935 21.398, 20.667 20.667 C 21.045 20.289, 20.065 18.634, 18.490 16.990 C 15.661 14.036, 14 13.231, 14 14.813 M 4.446 17.087 C 3.416 18.755, 5.733 20.667, 7.113 19.287 C 8.267 18.133, 7.545 16, 6 16 C 5.515 16, 4.816 16.489, 4.446 17.087" stroke="black" stroke-width="1.2" fill="white" fill-rule="evenodd"/></svg>') 12 12, auto`;

export function setScissorsCursor() {
    setCursor(scissorsCursor);
}

export function getURLForLanguage(lang: string | null | undefined, path: string): string {
    let newPath = path.replace(base, '');
    let languageInPath = newPath.split('/')[1];
    if (!languages.hasOwnProperty(languageInPath)) {
        languageInPath = 'en';
    }

    if (lang === null || lang === undefined) {
        lang = get(locale);
        if (lang === null || lang === undefined) {
            lang = 'en';
        }
    }

    if (languageInPath === 'en') {
        if (lang === 'en') {
            return `${base}${newPath}`;
        } else {
            return `${base}/${lang}${newPath}`;
        }
    } else {
        if (lang === 'en') {
            newPath = newPath.replace(`/${languageInPath}`, '');
            return newPath === '' ? `${base}/` : `${base}${newPath}`;
        } else {
            newPath = newPath.replace(`/${languageInPath}`, `/${lang}`);
            return `${base}${newPath}`;
        }
    }
}