mirror of
https://github.com/chartjs/Chart.js.git
synced 2024-10-08 05:09:08 +02:00
74 lines
1.1 KiB
Markdown
74 lines
1.1 KiB
Markdown
|
# Bar Chart
|
||
|
|
||
|
```js chart-editor
|
||
|
// <block:setup:2>
|
||
|
var DATA_COUNT = 16;
|
||
|
Utils.srand(110);
|
||
|
|
||
|
const actions = [
|
||
|
{
|
||
|
name: 'Randomize',
|
||
|
handler(chart) {
|
||
|
chart.data.datasets.forEach(dataset => {
|
||
|
dataset.data = generateData();
|
||
|
});
|
||
|
chart.update();
|
||
|
}
|
||
|
},
|
||
|
];
|
||
|
// </block:setup>
|
||
|
|
||
|
// <block:data:1>
|
||
|
function generateData() {
|
||
|
return Utils.numbers({
|
||
|
count: DATA_COUNT,
|
||
|
min: -100,
|
||
|
max: 100
|
||
|
});
|
||
|
}
|
||
|
|
||
|
const data = {
|
||
|
labels: Utils.months({count: DATA_COUNT}),
|
||
|
datasets: [{
|
||
|
data: generateData(),
|
||
|
}]
|
||
|
};
|
||
|
// </block:data>
|
||
|
|
||
|
// <block:options:0>
|
||
|
function colorize(opaque) {
|
||
|
return (ctx) => {
|
||
|
var v = ctx.parsed.y;
|
||
|
var c = v < -50 ? '#D60000'
|
||
|
: v < 0 ? '#F46300'
|
||
|
: v < 50 ? '#0358B6'
|
||
|
: '#44DE28';
|
||
|
|
||
|
return opaque ? c : Utils.transparentize(c, 1 - Math.abs(v / 150));
|
||
|
};
|
||
|
}
|
||
|
|
||
|
const config = {
|
||
|
type: 'bar',
|
||
|
data: data,
|
||
|
options: {
|
||
|
plugins: {
|
||
|
legend: false,
|
||
|
},
|
||
|
elements: {
|
||
|
bar: {
|
||
|
backgroundColor: colorize(false),
|
||
|
borderColor: colorize(true),
|
||
|
borderWidth: 2
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
};
|
||
|
// </block:options>
|
||
|
|
||
|
module.exports = {
|
||
|
actions,
|
||
|
config,
|
||
|
};
|
||
|
```
|