30 lines
932 B
JavaScript
30 lines
932 B
JavaScript
|
import { getLogPositiveMin, log } from '../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
|
||
|
|
*/
|
||
|
|
export default function calculateLogTicks(cfg) {
|
||
|
|
var base = cfg.base, tickCount = cfg.tickCount, min = cfg.min, max = cfg.max, values = cfg.values;
|
||
|
|
var minTick;
|
||
|
|
var maxTick = log(base, max);
|
||
|
|
if (min > 0) {
|
||
|
|
minTick = Math.floor(log(base, min));
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
var positiveMin = getLogPositiveMin(values, base, max);
|
||
|
|
minTick = Math.floor(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;
|
||
|
|
}
|
||
|
|
//# sourceMappingURL=log.js.map
|