dd_xcx/node_modules/@antv/scale/lib/linear.js

function _inheritsLoose(subClass, superClass) { subClass.prototype = Object.create(superClass.prototype); subClass.prototype.constructor = subClass; subClass.__proto__ = superClass; }

/**
 * @fileOverview The measurement of linear data scale function
 * @author dxq613@gmail.com
 */
var isNil = require('@antv/util/lib/type/is-nil');

var each = require('@antv/util/lib/each');

var Base = require('./base');

var numberAuto = require('./auto/number');
/**
 * 线性度量
 * @class Scale.Linear
 */


var Linear =
/*#__PURE__*/
function (_Base) {
  _inheritsLoose(Linear, _Base);

  function Linear() {
    return _Base.apply(this, arguments) || this;
  }

  var _proto = Linear.prototype;

  _proto._initDefaultCfg = function _initDefaultCfg() {
    _Base.prototype._initDefaultCfg.call(this);

    var self = this;
    self.type = 'linear';
    self.isLinear = true;
    /**
     * 是否为了用户习惯，优化min,max和ticks，如果进行优化，则会根据生成的ticks调整min,max，否则舍弃(min,max)范围之外的ticks
     * @type {Boolean}
     * @default false
     */

    self.nice = false;
    /**
     * min value of the scale
     * @type {Number}
     * @default null
     */

    self.min = null;
    /**
     * min value limitted of the scale
     * @type {Number}
     * @default null
     */

    self.minLimit = null;
    /**
     * max value of the scale
     * @type {Number}
     * @default null
     */

    self.max = null;
    /**
     * max value limitted of the scale
     * @type {Number}
     * @default null
     */

    self.maxLimit = null;
    /**
     * 自动生成标记时的个数
     * @type {Number}
     * @default null
     */

    self.tickCount = null;
    /**
     * 坐标轴点之间的间距，指的是真实数据的差值
     * @type {Number}
     * @default null
     */

    self.tickInterval = null;
    /**
     * 坐标轴点之间的最小间距，指的是真实数据的差值
     * @type {Number}
     * @default null
     */

    self.minTickInterval = null;
    /**
     * 用于计算坐标点时逼近的数组
     * @type {Array}
     */

    self.snapArray = null;
  }
  /**
   * @protected
   * @override
   */
  ;

  _proto.init = function init() {
    var self = this;

    if (!self.ticks) {
      self.min = self.translate(self.min);
      self.max = self.translate(self.max);
      self.initTicks();
    } else {
      var ticks = self.ticks;
      var firstValue = self.translate(ticks[0]);
      var lastValue = self.translate(ticks[ticks.length - 1]);

      if (isNil(self.min) || self.min > firstValue) {
        self.min = firstValue;
      }

      if (isNil(self.max) || self.max < lastValue) {
        self.max = lastValue;
      }
    }
  }
  /**
   * 计算坐标点
   * @protected
   * @return {Array} 计算完成的坐标点
   */
  ;

  _proto.calculateTicks = function calculateTicks() {
    var min = this.min,
        max = this.max,
        minLimit = this.minLimit,
        maxLimit = this.maxLimit,
        tickCount = this.tickCount,
        tickInterval = this.tickInterval,
        minTickInterval = this.minTickInterval,
        snapArray = this.snapArray;

    if (tickCount === 1) {
      throw new Error('linear scale\'tickCount should not be 1');
    }

    if (max < min) {
      throw new Error("max: " + max + " should not be less than min: " + min);
    }

    var tmp = numberAuto({
      min: min,
      max: max,
      minLimit: minLimit,
      maxLimit: maxLimit,
      minCount: tickCount,
      maxCount: tickCount,
      interval: tickInterval,
      minTickInterval: minTickInterval,
      snapArray: snapArray
    });
    return tmp.ticks;
  } // 初始化ticks
  ;

  _proto.initTicks = function initTicks() {
    var self = this;
    var calTicks = self.calculateTicks();

    if (self.nice) {
      // 如果需要优化显示的tick
      self.ticks = calTicks;
      self.min = calTicks[0];
      self.max = calTicks[calTicks.length - 1];
    } else {
      var ticks = [];
      each(calTicks, function (tick) {
        if (tick >= self.min && tick <= self.max) {
          ticks.push(tick);
        }
      }); // 如果 ticks 为空，直接输入最小值、最大值

      if (!ticks.length) {
        ticks.push(self.min);
        ticks.push(self.max);
      }

      self.ticks = ticks;
    }
  }
  /**
   * @override
   */
  ;

  _proto.scale = function scale(value) {
    if (isNil(value)) {
      return NaN;
    }

    var max = this.max;
    var min = this.min;

    if (max === min) {
      return 0;
    }

    var percent = (value - min) / (max - min);
    var rangeMin = this.rangeMin();
    var rangeMax = this.rangeMax();
    return rangeMin + percent * (rangeMax - rangeMin);
  }
  /**
   * @override
   */
  ;

  _proto.invert = function invert(value) {
    var percent = (value - this.rangeMin()) / (this.rangeMax() - this.rangeMin());
    return this.min + percent * (this.max - this.min);
  };

  return Linear;
}(Base);

Base.Linear = Linear;
module.exports = Linear;