@antv/f2
Version:
Charts for mobile visualization.
32 lines • 1.06 kB
JavaScript
import { fixedBase } from '@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;
}
export default 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 = fixedBase(minTick, interval);
maxTick = 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 = fixedBase(i, availableInterval); // 防止浮点数加法出现问题
ticks.push(tickValue);
}
return {
min: minTick,
max: maxTick,
ticks: ticks
};
}