@antv/f2/es/deps/f2-scale/src/continuous/log.js

Charts for mobile visualization.

import { __extends } from "tslib";
import { getLogPositiveMin, log } from '../util/math';
import Continuous from './base';
/**
 * Log 度量，处理非均匀分布
 */
var Log = /** @class */function (_super) {
  __extends(Log, _super);
  function Log() {
    var _this = _super !== null && _super.apply(this, arguments) || this;
    _this.type = 'log';
    return _this;
  }
  /**
   * @override
   */
  Log.prototype.invert = function (value) {
    var base = this.base;
    var max = log(base, this.max);
    var rangeMin = this.rangeMin();
    var range = this.rangeMax() - rangeMin;
    var min;
    var positiveMin = this.positiveMin;
    if (positiveMin) {
      if (value === 0) {
        return 0;
      }
      min = log(base, positiveMin / base);
      var appendPercent = 1 / (max - min) * range; // 0 到 positiveMin的占比
      if (value < appendPercent) {
        // 落到 0 - positiveMin 之间
        return value / appendPercent * positiveMin;
      }
    } else {
      min = log(base, this.min);
    }
    var percent = (value - rangeMin) / range;
    var tmp = percent * (max - min) + min;
    return Math.pow(base, tmp);
  };
  Log.prototype.initCfg = function () {
    this.tickMethod = 'log';
    this.base = 10;
    this.tickCount = 6;
    this.nice = true;
  };
  // 设置
  Log.prototype.setDomain = function () {
    _super.prototype.setDomain.call(this);
    var min = this.min;
    if (min < 0) {
      throw new Error('When you use log scale, the minimum value must be greater than zero!');
    }
    if (min === 0) {
      this.positiveMin = getLogPositiveMin(this.values, this.base, this.max);
    }
  };
  // 根据当前值获取占比
  Log.prototype.getScalePercent = function (value) {
    var max = this.max;
    var min = this.min;
    if (max === min) {
      return 0;
    }
    // 如果值小于等于0，则按照0处理
    if (value <= 0) {
      return 0;
    }
    var base = this.base;
    var positiveMin = this.positiveMin;
    // 如果min == 0, 则根据比0大的最小值，计算比例关系。这个最小值作为坐标轴上的第二个tick，第一个是0但是不显示
    if (positiveMin) {
      min = positiveMin * 1 / base;
    }
    var percent;
    // 如果数值小于次小值，那么就计算 value / 次小值 占整体的比例
    if (value < positiveMin) {
      percent = value / positiveMin / (log(base, max) - log(base, min));
    } else {
      percent = (log(base, value) - log(base, min)) / (log(base, max) - log(base, min));
    }
    return percent;
  };
  return Log;
}(Continuous);
export default Log;