om/node_modules/vuetify/lib/components/VSparkline/helpers/path.js

import { checkCollinear, getDistance, moveTo } from './math';
/**
 * From https://github.com/unsplash/react-trend/blob/master/src/helpers/DOM.helpers.js#L18
 */
export function genPath(points, radius) {
    var fill = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;
    var height = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : 75;

    var start = points.shift();
    var end = points[points.length - 1];
    return (fill ? 'M' + start.x + ' ' + height + ' L' + start.x + ' ' + start.y : 'M' + start.x + ' ' + start.y) + points.map(function (point, index) {
        var next = points[index + 1];
        var prev = points[index - 1] || start;
        var isCollinear = next && checkCollinear(next, point, prev);
        if (!next || isCollinear) {
            return 'L' + point.x + ' ' + point.y;
        }
        var threshold = Math.min(getDistance(prev, point), getDistance(next, point));
        var isTooCloseForRadius = threshold / 2 < radius;
        var radiusForPoint = isTooCloseForRadius ? threshold / 2 : radius;
        var before = moveTo(prev, point, radiusForPoint);
        var after = moveTo(next, point, radiusForPoint);
        return 'L' + before.x + ' ' + before.y + 'S' + point.x + ' ' + point.y + ' ' + after.x + ' ' + after.y;
    }).join('') + (fill ? 'L' + end.x + ' ' + height + ' Z' : '');
}
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