MapGIS Client for JavaScript API

import VisualVariable from './VisualVariable'
import { Zondy } from '../../../base'
import { defaultValue } from '../../../util'
import VisualVariableType from '../../../base/enum/VisualVariableType'
import ColorStop from './support/ColorStop'

/**
 * color视觉变量
 * @class ColorVariable
 * @moduleEX RendererModule
 * @param {Object} options 初始化参数
 * @param {Array<ColorStop>} [options.stops] 颜色分段数组
 * 
 * @example color视觉变量使用方式
 * // 获取layer上renderer对象
 *  const renderer = layer.renderer
 * // 根据FID取值设置#FFFCD4到#350242的过渡颜色值
 * // FID取值小于0时，显示颜色#FFFCD4
 * // FID取值大于200时，显示颜色#350242
 * // FID取值在0-200之间时，显示颜色过渡值
 *  renderer.visualVariables = [{
            type: "color",
            valueExpression: "$feature.FID",
            stops: [
              {
                color: "#FFFCD4",
                value: 0,
              },
              {
                color: "#350242",
                value: 200,
              },
            ],
          }]
 * 
 */
class ColorVariable extends VisualVariable {
  constructor(options) {
    super(options)
    options = defaultValue(options, {})
    this.type = VisualVariableType.color
    /**
     * 归一化字段
     * @member {Array<ColorStop>} ColorVariable.prototype.stops
     */
    this.stops = defaultValue(options.stops, [])
    this.stops = this.stops.map((v) => ColorStop.fromJSON(v))
  }

  /**
   * 通过json构造ColorVariable对象
   * @return {ColorVariable} json对象
   * */
  static fromJSON(json) {
    return new ColorVariable(json)
  }

  /**
   * 导出为json对象
   * @return {Object} json对象
   * */
  toJSON() {
    const json = super.toJSON()
    json.type = this.type
    json.normalizationField = this.normalizationField
    json.stops = this.stops.map((v) => v.toJSON())
    return json
  }

  /**
   * 克隆对象
   * @return {ColorVariable} 克隆后的ColorVariable对象
   */
  clone() {
    return new ColorVariable(this.toJSON())
  }
}

Zondy.Renderer.VisualVariable.ColorVariable = ColorVariable
export default ColorVariable