Method getPathway

src/openlayers/core/StyleUtils.js:1216–1243

* @function StyleUtils.getPathway 获取铁路样式 * @param {Object} style - 样式参数 * @param {Object} outlineStyle - 轮廓样式参数 * @returns {Object} style对象

(style, outlineStyle)

   * @returns {Object} style对象
   */
  static getPathway(style, outlineStyle) {
      let { strokeWidth=ZERO, strokeColor, strokeOpacity } = style;
      // 道路线都是solid, lineCap都是直角
      const lineDash = (w => [w, w + strokeWidth * 2])(4 * strokeWidth), lineCap= 'square';
      let strokeColorArray = this.hexToRgb(strokeColor);
      strokeColorArray && strokeColorArray.push(strokeOpacity);
      var stroke = new Style({
          stroke: new StrokeStyle({
              width: strokeWidth*0.5 || ZERO,
              color: strokeColorArray,
              lineCap,
              lineDash
          })
      });

    const { strokeColor: outlineColor } = outlineStyle;
    let outlineColorArray = this.hexToRgb(outlineColor);
    // opacity使用style的透明度。保持两根线透明度一致
    outlineColorArray && outlineColorArray.push(strokeOpacity);
    var outlineStroke = new Style({
        stroke: new StrokeStyle({
          width: strokeWidth || ZERO,
            color: outlineColorArray,
            lineCap
        })
    });
    return [outlineStroke, stroke];
  }
}