@antv/f2/lib/deps/f2-scale/src/util/interval.js

Charts for mobile visualization.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = intervalTicks;
var _util = require("@antv/util");
function snapMultiple(v, base, snapType) {
  var div;
  if (snapType === 'ceil') {
    div = Math.ceil(v / base);
  } else if (snapType === 'floor') {
    div = Math.floor(v / base);
  } else {
    div = Math.round(v / base);
  }
  return div * base;
}
function intervalTicks(min, max, interval) {
  // 变成 interval 的倍数
  var minTick = snapMultiple(min, interval, 'floor');
  var maxTick = snapMultiple(max, interval, 'ceil');
  // 统一小数位数
  minTick = (0, _util.fixedBase)(minTick, interval);
  maxTick = (0, _util.fixedBase)(maxTick, interval);
  var ticks = [];
  // https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Errors/Invalid_array_length
  var availableInterval = Math.max((maxTick - minTick) / (Math.pow(2, 12) - 1), interval);
  for (var i = minTick; i <= maxTick; i = i + availableInterval) {
    var tickValue = (0, _util.fixedBase)(i, availableInterval); // 防止浮点数加法出现问题
    ticks.push(tickValue);
  }
  return {
    min: minTick,
    max: maxTick,
    ticks: ticks
  };
}