@visactor/vrender-kits/cjs/canvas/contributions/lynx/context.js

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

"use strict";

var __decorate = this && this.__decorate || function(decorators, target, key, desc) {
    var d, c = arguments.length, r = c < 3 ? target : null === desc ? desc = Object.getOwnPropertyDescriptor(target, key) : desc;
    if ("object" == typeof Reflect && "function" == typeof Reflect.decorate) r = Reflect.decorate(decorators, target, key, desc); else for (var i = decorators.length - 1; i >= 0; i--) (d = decorators[i]) && (r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r);
    return c > 3 && r && Object.defineProperty(target, key, r), r;
};

Object.defineProperty(exports, "__esModule", {
    value: !0
}), exports.LynxContext2d = void 0;

const vrender_core_1 = require("@visactor/vrender-core"), browser_1 = require("../browser");

let LynxContext2d = class extends browser_1.BrowserContext2d {
    get globalAlpha() {
        return this._globalAlpha;
    }
    set globalAlpha(ga) {
        this.nativeContext.globalAlpha = ga * this.baseGlobalAlpha, this._globalAlpha = ga * this.baseGlobalAlpha;
    }
    setLineDash(segments) {
        const a = arguments, _context = this.nativeContext;
        if (this.nativeContext.setLineDash) {
            const lineDash = a[0];
            if (0 === lineDash[0] && 0 === lineDash[1]) return;
            lineDash && _context.setLineDash(lineDash);
        }
    }
    _setStrokeStyle(params, attribute, offsetX, offsetY, defaultParams) {
        const _context = this.nativeContext;
        defaultParams || (defaultParams = this.strokeAttributes);
        const {strokeOpacity: strokeOpacity = defaultParams.strokeOpacity, opacity: opacity = defaultParams.opacity} = attribute;
        if (strokeOpacity > 1e-12 && opacity > 1e-12) {
            const {lineWidth: lineWidth = defaultParams.lineWidth, stroke: stroke = defaultParams.stroke, lineJoin: lineJoin = defaultParams.lineJoin, lineDash: lineDash = defaultParams.lineDash, lineCap: lineCap = defaultParams.lineCap, miterLimit: miterLimit = defaultParams.miterLimit, keepStrokeScale: keepStrokeScale = defaultParams.keepStrokeScale, lineDashOffset: lineDashOffset = defaultParams.lineDashOffset} = attribute;
            _context.globalAlpha = strokeOpacity * opacity * this.baseGlobalAlpha, _context.lineWidth = keepStrokeScale ? lineWidth : (0, 
            vrender_core_1.getScaledStroke)(this, lineWidth, this.dpr), _context.strokeStyle = (0, 
            vrender_core_1.createColor)(this, stroke, params, offsetX, offsetY), _context.lineJoin = lineJoin, 
            0 === lineDash[0] && 0 === lineDash[1] || !lineDash || (_context.setLineDash(lineDash), 
            _context.lineDashOffset = lineDashOffset), _context.lineCap = lineCap, _context.miterLimit = miterLimit;
        }
    }
    measureText(text, method = vrender_core_1.application.global.measureTextMethod) {
        this.setTransform(1, 0, 0, 1, 0, 0, !0, vrender_core_1.application.global.devicePixelRatio);
        return {
            width: super.measureText(text, method).width,
            fontBoundingBoxDescent: void 0,
            fontBoundingBoxAscent: void 0,
            actualBoundingBoxAscent: void 0,
            actualBoundingBoxDescent: void 0
        };
    }
    createPattern(image, repetition) {
        return null;
    }
    draw() {
        const _context = this.nativeContext;
        _context.draw && (this.drawPromise = new Promise((resolve => {
            _context.draw(!0, (() => {
                this.drawPromise = null, resolve(null);
            }));
        })));
    }
};

LynxContext2d.env = "lynx", LynxContext2d = __decorate([ (0, vrender_core_1.injectable)() ], LynxContext2d), 
exports.LynxContext2d = LynxContext2d;
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