当前 Chart util.js 源代码用于 anular 或 react，但不适用于纯 JS。
使用我做的这个改编，命名为 chart.util.js ，放在你的 rootweb/inc/ 上
我稍后使用脚本代码来移植极地区域图，但是使用我制作的 chart.util.js 文件然后其他图表就可以了，移植正文脚本
https://www.chartjs.org/docs/latest/samples/other-charts/polar-area.html
chart.util.js ======= ####
'use strict';
window.chartColors = {
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)'
};
(function(global) {
var MONTHS = [
'January',
'February',
'March',
'April',
'May',
'June',
'July',
'August',
'September',
'October',
'November',
'December'
];
var COLORS = [
'#4dc9f6',
'#f67019',
'#f53794',
'#537bc4',
'#acc236',
'#166a8f',
'#00a950',
'#58595b',
'#8549ba'
];
var Samples = global.Samples || (global.Samples = {});
var Color = global.Color;
Samples.utils = {
// Adapted from http://indiegamr.com/generate-repeatable-random-numbers-in-js/
srand: function(seed) {
this._seed = seed;
},
rand: function(min, max) {
var seed = this._seed;
min = min === undefined ? 0 : min;
max = max === undefined ? 1 : max;
this._seed = (seed * 9301 + 49297) % 233280;
return min + (this._seed / 233280) * (max - min);
},
numbers: function(config) {
var cfg = config || {};
var min = cfg.min || 0;
var max = cfg.max || 1;
var from = cfg.from || [];
var count = cfg.count || 8;
var decimals = cfg.decimals || 8;
var continuity = 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;
},
labels: function(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;
},
months: function(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;
},
color: function(index) {
return COLORS[index % COLORS.length];
},
//transparentize: function(color, opacity) {
// var alpha = opacity === undefined ? 0.5 : 1 - opacity;
// return ColorO(color).alpha(alpha).rgbString();
//}
transparentize: function (r, g, b, alpha) {
const a = (1 - alpha) * 255;
const calc = x => Math.round((x - a)/alpha);
return `rgba(${calc(r)}, ${calc(g)}, ${calc(b)}, ${alpha})`;
}
};
// DEPRECATED
window.randomScalingFactor = function() {
return Math.round(Samples.utils.rand(-100, 100));
};
// INITIALIZATION
Samples.utils.srand(Date.now());
// Google Analytics
/* eslint-disable */
if (document.location.hostname.match(/^(www\.)?chartjs\.org$/)) {
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
})(window,document,'script','//www.google-analytics.com/analytics.js','ga');
ga('create', 'UA-28909194-3', 'auto');
ga('send', 'pageview');
}
/* eslint-enable */
}(this));
然后在您的 .html 上使用纯 JS 使用：
在标题上
<script type="text/javascript" src="https://yourweb.com/inc/chart.utils.js"></script>
然后在body标签结束前的BODY上
<script>
const actions = [
{
name: 'Randomize',
handler(chart) {
chart.data.datasets.forEach(dataset => {
dataset.data = Samples.utils.numbers({count: chart.data.labels.length, min: 0, max: 100});
});
chart.update();
}
},
{
name: 'Add Data',
handler(chart) {
const data = chart.data;
if (data.datasets.length > 0) {
data.labels.push('data #' + (data.labels.length + 1));
for (var index = 0; index < data.datasets.length; ++index) {
data.datasets[index].data.push(Samples.utils.rand(0, 100));
}
chart.update();
}
}
},
{
name: 'Remove Data',
handler(chart) {
chart.data.labels.splice(-1, 1); // remove the label first
chart.data.datasets.forEach(dataset => {
dataset.data.pop();
});
chart.update();
}
}
];
const DATA_COUNT = 5;
const NUMBER_CFG = {count: DATA_COUNT, min: 0, max: 100};
const labels = ['Red', 'Orange', 'Yellow', 'Green', 'Blue'];
const data = {
labels: labels,
datasets: [
{
label: 'Dataset 1',
data: Samples.utils.numbers(NUMBER_CFG),
backgroundColor: [
Samples.utils.transparentize(255, 99, 132, 0.5),
Samples.utils.transparentize(255, 159, 64, 0.5),
Samples.utils.transparentize(255, 205, 86, 0.5),
Samples.utils.transparentize(75, 192, 192, 0.5),
Samples.utils.transparentize(54, 162, 235, 0.5),
]
}
]
};
const config = {
type: 'polarArea',
data: data,
options: {
responsive: true,
plugins: {
legend: {
position: 'top',
},
title: {
display: true,
text: 'Chart.js Polar Area Chart'
}
}
},
};
var myChart = new Chart( document.getElementById('myChart'), config, data, actions );
</script>