Ngx-charts: Support for zoom and pan in line charts

[yagilofir]

Hi.
Is there a reason this library does not support zoom in/out with the mouse into x/y axes (and maybe also pan)?
For example, flot.js supports this (example: http://www.flotcharts.org/flot/examples/navigate/index.html).
This is a very basic feature for working with graphs. It will be very nice if you'll support it.

Thanks.

[marjan-georgiev]

We do have zoon and pan, but not directly in the chart. You can set the timeline input to true, and you will get this:

https://plnkr.co/edit/hTPaexbMyYbX8xJC38Ja?p=preview

The reason this is not inside the chart is because the mouse events inside the chart are used for things like tooltips and select.

[yagilofir]

Thanks for the short reply.
I saw the timeline feature before opening this issue. It's a very good feature but it doesn't have a y-axis zoom. Sometimes the user just want to see all values between y1 and y2 (zoom in/out within the y-axis), just like the flot example I showed.
Are the mouse wheel events taken for tooltip/select ? Cause I really think the mouse wheel events should be used for zoom in/out.

Thanks.

[marjan-georgiev]

The mouse wheel events are not used, but the mouse over and click events are.

This kind of feature can be built as a custom chart, because I don't think we have plans to add it to the line/area charts at this point. You could copy the line chart and implement it on top of it.

[thetravis]

According to documentation timeline is

Only available if x scale is date

Why is it limited to only x scale date?

I would like to use timeline with my data, but since the name values are not dates but numbers (milliseconds in this case), it doesn't work.

Edit. I think this is an issue of it's own so I open new issue.

[xdom]

This feature would be useful; at least autoscaling (zooming) y-axis when selecting certain time range on the timeline.

Motivation:
I have a line chart where usual y-axis domain is in range <-100;100>. However, sometimes a value can jump up to 100,000 and all them "low values" disappear even if I select time range with only them in scope.

_Figure A.: Full range of time and values selected_

_Figure B.: Only small range of time and values selected (should adjust y-axis domain to e.g. <-100;100>)_

[blogcraft]

Yeah, Autoscaling would be very usefull, HighCharts has it
But i'm not planning to use HighCharts ever again 😜

[chriszrc]

It looks like the timeline feature technically works with numbers too, even though it was probably designed for dates, this makes it much more useful, but it still won't help those of us wanting to use it for the purpose of zooming when the values are strings :( I also would like to be able to zoom any chart type, so this doesn't help for charts like bubble charts