[Bug] The gradient color effect of the "outerBorder.stroke" is not correct.

[xiaoluoHe]

Version

0.14.0

Link to Minimal Reproduction

none

Steps to Reproduce

import { createStage, createSymbol, container, IGraphic } from '@visactor/vrender';

// container.load(roughModule);

export const page = () => {
  const symbolList = [
    'circle',
    'cross',
    'diamond',
    'square',
    'arrow',
    'arrow2Left',
    'arrow2Right',
    'wedge',
    'thinTriangle',
    'triangle',
    'triangleUp',
    'triangleDown',
    'triangleRight',
    'triangleLeft',
    'stroke',
    'star',
    'wye',
    'rect',
    'M -2 2 L 4 -5 L 7 -6 L 6 -3 L -1 3 C 0 4 0 5 1 4 C 1 5 2 6 1 6 A 1.42 1.42 0 0 1 0 7 A 5 5 0 0 0 -2 4 Q -2.5 3.9 -2.5 4.5 T -4 5.8 T -4.8 5 T -3.5 3.5 T -3 3 A 5 5 90 0 0 -6 1 A 1.42 1.42 0 0 1 -5 0 C -5 -1 -4 0 -3 0 C -4 1 -3 1 -2 2 M 4 -5 L 4 -3 L 6 -3 L 5 -4 L 4 -5'
  ];
  const graphics: IGraphic[] = [];

  symbolList.forEach((st, i) => {
    const attrs = {
      symbolType: st,
      x: ((i * 100) % 500) + 100,
      y: (Math.floor((i * 100) / 500) + 1) * 100,
      size: 60,
      fill: 'pink',
      outerBorder: {
        stroke: {
          gradient: 'radial',
          x0: 0.5,
          y0: 0.5,
          r0: 0,
          x1: 0.5,
          y1: 0.5,
          r1: 0.7,
          stops: [
            {
              offset: 0,
              color: 'red'
            },
            {
              offset: 1,
              color: '#6690F2'
            }
          ]
        },
        distance: 10,
        lineWidth: 4,
        strokeOpacity: 0.2
      }
    };
    const symbol = createSymbol(attrs);
    console.log(attrs);
    symbol.addEventListener('mouseenter', () => {
      symbol.setAttribute('fill', 'blue');
    });
    graphics.push(symbol);
  });

  const stage = createStage({
    canvas: 'main',
    autoRender: true
  });

  graphics.forEach(g => {
    stage.defaultLayer.add(g);
  });
};

Current Behavior

Expected Behavior

Environment

- OS:
- Browser:
- Framework:

Any additional comments?

No response