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fix: dynamic highlight width (#9166)

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This makes the width of the highlight bars in the network dynamic and
based on the number of labels included in the chart.

Since the number of labels should always correspond to the number of
data points, this seems like a sensible approach.

With this, the label width will now be calculated on the fly, so even if
you resize the window or change the number of labels, the highlighting
will still work as expected.

Daily view:

![image](https://github.com/user-attachments/assets/e1d158db-0587-46b3-afb1-76dfc523505d)

Monthly aggregate:

![image](https://github.com/user-attachments/assets/8c74d2a3-afc8-4623-8ac7-0c263c7e6037)

The labels are now a little narrower on the daily graphs, but it avoids
them being super wide on the monthly graphs
This commit is contained in:
Thomas Heartman 2025-01-29 12:03:31 +01:00 committed by GitHub
parent 22f9363a05
commit 7ca8cc2276
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2 changed files with 8 additions and 4 deletions
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2
frontend/src/component/admin/network/NetworkTrafficUsage/NetworkTrafficUsage.tsx
View File

@ -298,7 +298,7 @@ const NewNetworkTrafficUsage: FC = () => {
</NewHeader>
<Bar
data={data}
plugins={[customHighlightPlugin()]} // todo: accomodate wide bars when grouping by month
plugins={[customHighlightPlugin()]}
options={options}
aria-label='An instance metrics line chart with two lines: requests per second for admin API and requests per second for client API' // todo: this isn't correct at all!
/>

10
frontend/src/component/common/Chart/customHighlightPlugin.ts
View File

@ -1,6 +1,6 @@
import type { Chart } from 'chart.js';
export const customHighlightPlugin = (width = 46, bottomOverflow = 34) => ({
export const customHighlightPlugin = (bottomOverflow = 34) => ({
id: 'customLine',
beforeDraw: (chart: Chart) => {
if (chart.tooltip?.opacity && chart.tooltip.x) {
@ -17,10 +17,14 @@ export const customHighlightPlugin = (width = 46, bottomOverflow = 34) => ({
gradient.addColorStop(0, 'rgba(129, 122, 254, 0)');
gradient.addColorStop(1, 'rgba(129, 122, 254, 0.12)');
ctx.fillStyle = gradient;
const barWidth =
(chart.width / (chart.data.labels?.length ?? 1)) *
(chart.options.datasets?.bar?.categoryPercentage ?? 1);
ctx.roundRect(
x - width / 2,
x - barWidth / 2,
yAxis.top,
width,
barWidth,
yAxis.bottom - yAxis.top + bottomOverflow,
5,
);