ducha-qianduan/node_modules/zrender/lib/graphic/helper/fixClipWithShadow.js

var env = require("../../core/env");

// Fix weird bug in some version of IE11 (like 11.0.9600.178**),
// where exception "unexpected call to method or property access"
// might be thrown when calling ctx.fill or ctx.stroke after a path
// whose area size is zero is drawn and ctx.clip() is called and
// shadowBlur is set. See #4572, #3112, #5777.
// (e.g.,
//  ctx.moveTo(10, 10);
//  ctx.lineTo(20, 10);
//  ctx.closePath();
//  ctx.clip();
//  ctx.shadowBlur = 10;
//  ...
//  ctx.fill();
// )
var shadowTemp = [['shadowBlur', 0], ['shadowColor', '#000'], ['shadowOffsetX', 0], ['shadowOffsetY', 0]];

function _default(orignalBrush) {
  // version string can be: '11.0'
  return env.browser.ie && env.browser.version >= 11 ? function () {
    var clipPaths = this.__clipPaths;
    var style = this.style;
    var modified;

    if (clipPaths) {
      for (var i = 0; i < clipPaths.length; i++) {
        var clipPath = clipPaths[i];
        var shape = clipPath && clipPath.shape;
        var type = clipPath && clipPath.type;

        if (shape && (type === 'sector' && shape.startAngle === shape.endAngle || type === 'rect' && (!shape.width || !shape.height))) {
          for (var j = 0; j < shadowTemp.length; j++) {
            // It is save to put shadowTemp static, because shadowTemp
            // will be all modified each item brush called.
            shadowTemp[j][2] = style[shadowTemp[j][0]];
            style[shadowTemp[j][0]] = shadowTemp[j][1];
          }

          modified = true;
          break;
        }
      }
    }

    orignalBrush.apply(this, arguments);

    if (modified) {
      for (var j = 0; j < shadowTemp.length; j++) {
        style[shadowTemp[j][0]] = shadowTemp[j][2];
      }
    }
  } : orignalBrush;
}

module.exports = _default;