问题描述
我正在尝试从 chart.js 文档中复制这个示例: https://www.chartjs.org/docs/latest/samples/line/interpolation.html
但我不断收到此错误:
未捕获的 ReferenceError: Utils 未定义
我尝试在 Chart.js 文档中搜索“Utils”,但没有成功。 知道如何正确使用它吗?我显然缺少一些基本的东西。
解决方法
我在Github project四处寻找
这是代码示例中提到的 Utils 文件的 link。
将此文件添加到您的项目中,它现在应该可以工作了。
如果将来链接断开,请添加提到的 Utils 代码。
import colorLib from '@kurkle/color';
import {DateTime} from 'luxon';
import 'chartjs-adapter-luxon';
import {valueOrDefault} from '../../dist/helpers.esm';
// Adapted from http://indiegamr.com/generate-repeatable-random-numbers-in-js/
var _seed = Date.now();
export function srand(seed) {
_seed = seed;
}
export function rand(min,max) {
min = valueOrDefault(min,0);
max = valueOrDefault(max,0);
_seed = (_seed * 9301 + 49297) % 233280;
return min + (_seed / 233280) * (max - min);
}
export function numbers(config) {
var cfg = config || {};
var min = valueOrDefault(cfg.min,0);
var max = valueOrDefault(cfg.max,100);
var from = valueOrDefault(cfg.from,[]);
var count = valueOrDefault(cfg.count,8);
var decimals = valueOrDefault(cfg.decimals,8);
var continuity = valueOrDefault(cfg.continuity,1);
var dfactor = Math.pow(10,decimals) || 0;
var data = [];
var i,value;
for (i = 0; i < count; ++i) {
value = (from[i] || 0) + this.rand(min,max);
if (this.rand() <= continuity) {
data.push(Math.round(dfactor * value) / dfactor);
} else {
data.push(null);
}
}
return data;
}
export function points(config) {
const xs = this.numbers(config);
const ys = this.numbers(config);
return xs.map((x,i) => ({x,y: ys[i]}));
}
export function bubbles(config) {
return this.points(config).map(pt => {
pt.r = this.rand(config.rmin,config.rmax);
return pt;
});
}
export function labels(config) {
var cfg = config || {};
var min = cfg.min || 0;
var max = cfg.max || 100;
var count = cfg.count || 8;
var step = (max - min) / count;
var decimals = cfg.decimals || 8;
var dfactor = Math.pow(10,decimals) || 0;
var prefix = cfg.prefix || '';
var values = [];
var i;
for (i = min; i < max; i += step) {
values.push(prefix + Math.round(dfactor * i) / dfactor);
}
return values;
}
const MONTHS = [
'January','February','March','April','May','June','July','August','September','October','November','December'
];
export function months(config) {
var cfg = config || {};
var count = cfg.count || 12;
var section = cfg.section;
var values = [];
var i,value;
for (i = 0; i < count; ++i) {
value = MONTHS[Math.ceil(i) % 12];
values.push(value.substring(0,section));
}
return values;
}
const COLORS = [
'#4dc9f6','#f67019','#f53794','#537bc4','#acc236','#166a8f','#00a950','#58595b','#8549ba'
];
export function color(index) {
return COLORS[index % COLORS.length];
}
export function transparentize(value,opacity) {
var alpha = opacity === undefined ? 0.5 : 1 - opacity;
return colorLib(value).alpha(alpha).rgbString();
}
export const CHART_COLORS = {
red: 'rgb(255,99,132)',orange: 'rgb(255,159,64)',yellow: 'rgb(255,205,86)',green: 'rgb(75,192,192)',blue: 'rgb(54,162,235)',purple: 'rgb(153,102,255)',grey: 'rgb(201,203,207)'
};
const NAMED_COLORS = [
CHART_COLORS.red,CHART_COLORS.orange,CHART_COLORS.yellow,CHART_COLORS.green,CHART_COLORS.blue,CHART_COLORS.purple,CHART_COLORS.grey,];
export function namedColor(index) {
return NAMED_COLORS[index % NAMED_COLORS.length];
}
export function newDate(days) {
return DateTime.now().plus({days}).toJSDate();
}
export function newDateString(days) {
return DateTime.now().plus({days}).toISO();
}
export function parseISODate(str) {
return DateTime.fromISO(str);
}
,
代替
borderColor: Utils.CHART_COLORS.red
,
我用过
borderColor: '#00FF00',
成功。