Method setFeatureStyle

src/openlayers/mapping/WebMap.js:4010–4033

* @private * @function WebMap.prototype.setFeatureStyle * @description 设置feature样式 * @param {Object} layer - 图层对象 * @param {string} directionField - 方向字段 * @param {string} styleType - 样式的类型

(layer, directionField, styleType)

   * @param {string} styleType - 样式的类型
   */
  setFeatureStyle(layer, directionField, styleType) {
    let layerStyle = layer.get('styleOL');
    layer.setStyle((feature) => {
      //有转向字段
      let value, image;
      if (directionField !== undefined && directionField !== '未设置' && directionField !== 'None') {
        value = feature.get('attributes')[directionField];
      } else {
        value = 0;
      }
      if (value > 360 || value < 0) {
        return null;
      }
      if (styleType === 'SYMBOL_POINT') {
        image = layerStyle.getText();
      } else {
        image = layerStyle.getImage();
      }
      //默认用户使用的是角度，换算成弧度
      let rotate = (Math.PI * value) / 180;
      image && image.setRotation(rotate);
      return layerStyle;
    });
  }

  /**
   * @private