With `pause: true` without setting `ttl`, old data is not removed about chartjs-plugin-streaming HOT 5 CLOSED

One issue with the workaround is that when ttl is set, backlog is set to 0 so the chart can get messed up.

from chartjs-plugin-streaming.

Thank you for reporting this issue. This is definitely a bug, and I'm considering the following solution:

When the chart is paused,

• if ttl is not set, the plugin code removes the data between the right end of the chart and the current time - duration - delay.
• if ttl is set, the plugin code removes the data between the right end of the chart and the current time - ttl.

This allows both the visible data and the recent data to be preserved while unnecessary data is removed. It also makes sure to preserve a few data points off the chart so that it doesn't affect interpolation.

from chartjs-plugin-streaming.

Thank you for looking into this! I just tried master and without looking too much into it, it appears to be solving the issue with data not being removed.

However, I noticed that the Y scale can now change while paused and it redraws the chart.

It also appears to be doing more stuff while paused now than before.

The main reason I'm pausing the chart is for performance (less cpu usage), but since it is doing so much work per frame, I think it's a better solution for me to hide the chart completely and switch to a placeholder of some kind.

from chartjs-plugin-streaming.

This change (drawing during pause) was introduced to support per-axis options, but it impacts the cpu usage as you says. Let me think about a better solution on this.

from chartjs-plugin-streaming.

I added the check if each scale is paused to decide whether to render the frame in d76c0d6. Now it works the same way as before.

from chartjs-plugin-streaming.