swOperation/node_modules/@antv/g2/esm/data/utils/venn/diagram.js

import { intersectionArea } from './circleintersection';
/**
 * 根据圆心(x, y) 半径 r 返回圆的绘制 path
 * @param x 圆心点 x
 * @param y 圆心点 y
 * @param r 圆的半径
 * @returns 圆的 path
 */
function circlePath(x, y, r) {
    const ret = [];
    // ret.push('\nM', x, y);
    // ret.push('\nm', -r, 0);
    // ret.push('\na', r, r, 0, 1, 0, r * 2, 0);
    // ret.push('\na', r, r, 0, 1, 0, -r * 2, 0);
    const x0 = x - r;
    const y0 = y;
    ret.push('M', x0, y0);
    ret.push('A', r, r, 0, 1, 0, x0 + 2 * r, y0);
    ret.push('A', r, r, 0, 1, 0, x0, y0);
    return ret.join(' ');
}
/** returns a svg path of the intersection area of a bunch of circles */
export function intersectionAreaPath(circles) {
    const stats = {};
    intersectionArea(circles, stats);
    const arcs = stats.arcs;
    if (arcs.length === 0) {
        return 'M 0 0';
    }
    else if (arcs.length == 1) {
        const circle = arcs[0].circle;
        return circlePath(circle.x, circle.y, circle.radius);
    }
    else {
        // draw path around arcs
        const ret = ['\nM', arcs[0].p2.x, arcs[0].p2.y];
        for (let i = 0; i < arcs.length; ++i) {
            const arc = arcs[i], r = arc.circle.radius, wide = arc.width > r;
            ret.push('\nA', r, r, 0, wide ? 1 : 0, 1, arc.p1.x, arc.p1.y);
        }
        return ret.join(' ');
    }
}
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