@antv/scale/lib/tick-method/log.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var math_1 = require("../util/math");
/**
 * 计算 log 的 ticks，考虑 min = 0 的场景
 * @param cfg 度量的配置项
 * @returns 计算后的 ticks
 */
function calculateLogTicks(cfg) {
    var base = cfg.base, tickCount = cfg.tickCount, min = cfg.min, max = cfg.max, values = cfg.values;
    var minTick;
    var maxTick = math_1.log(base, max);
    if (min > 0) {
        minTick = Math.floor(math_1.log(base, min));
    }
    else {
        var positiveMin = math_1.getLogPositiveMin(values, base, max);
        minTick = Math.floor(math_1.log(base, positiveMin));
    }
    var count = maxTick - minTick;
    var avg = Math.ceil(count / tickCount);
    var ticks = [];
    for (var i = minTick; i < maxTick + avg; i = i + avg) {
        ticks.push(Math.pow(base, i));
    }
    if (min <= 0) {
        // 最小值 <= 0 时显示 0
        ticks.unshift(0);
    }
    return ticks;
}
exports.default = calculateLogTicks;
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