@visactor/vrender-core/es/common/bounds-context.js

```typescript import { xxx } from '@visactor/vrender-core'; ```

import { halfPi, tau } from "@visactor/vutils";

const circleThreshold = tau - 1e-8;

export class BoundsContext {
    constructor(bounds) {
        this.init(bounds);
    }
    init(bounds) {
        this.bounds = bounds;
    }
    arc(cx, cy, r, sa, ea, ccw) {
        if (Math.abs(ea - sa) > circleThreshold) return this.bounds.add(cx - r, cy - r), 
        void this.bounds.add(cx + r, cy + r);
        let s, i, x, y, xmin = 1 / 0, xmax = -1 / 0, ymin = 1 / 0, ymax = -1 / 0;
        function update(a) {
            x = r * Math.cos(a), y = r * Math.sin(a), x < xmin && (xmin = x), x > xmax && (xmax = x), 
            y < ymin && (ymin = y), y > ymax && (ymax = y);
        }
        if (update(sa), update(ea), ea !== sa) if ((sa %= tau) < 0 && (sa += tau), (ea %= tau) < 0 && (ea += tau), 
        ea < sa && (ccw = !ccw, s = sa, sa = ea, ea = s), ccw) for (ea -= tau, s = sa - sa % halfPi, 
        i = 0; i < 4 && s > ea; ++i, s -= halfPi) update(s); else for (s = sa - sa % halfPi + halfPi, 
        i = 0; i < 4 && s < ea; ++i, s += halfPi) update(s);
        this.bounds.add(cx + xmin, cy + ymin), this.bounds.add(cx + xmax, cy + ymax);
    }
    arcTo(x1, y1, x2, y2, radius) {
        this.bounds.add(x1, y1);
    }
    bezierCurveTo(cp1x, cp1y, cp2x, cp2y, x, y) {
        this.bounds.add(cp1x, cp1y), this.bounds.add(cp2x, cp2y), this.bounds.add(x, y);
    }
    closePath() {}
    ellipse() {
        throw new Error("不支持ellipse");
    }
    lineTo(x, y) {
        this.bounds.add(x, y);
    }
    moveTo(x, y) {
        this.bounds.add(x, y);
    }
    quadraticCurveTo(cpx, cpy, x, y) {
        this.bounds.add(cpx, cpy), this.bounds.add(x, y);
    }
    rect(x, y, w, h) {
        this.bounds.add(x, y), this.bounds.add(x + w, y + h);
    }
    clear() {
        this.bounds.clear();
    }
    release(...params) {}
}
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