Merge spectrum display components from SDRangelSpectrum app

[f4exb]

This is to create a component capable to render the spectrum data that would be sent from a SDRangel instance when this ticket is implemented: https://github.com/f4exb/sdrangel/issues/224

[f4exb]

Example of Canvas usage: https://medium.com/@tarik.nzl/creating-a-canvas-component-with-free-hand-drawing-with-rxjs-and-angular-61279f577415 Very similar: https://gist.github.com/anupkrbid/6447d97df6be6761d394f18895bc680d Very very minimal example: https://stackblitz.com/edit/canvas-example-angular Simple animations: https://codeburst.io/canvas-animations-in-typescript-97ba0163cb19 An application with waterfall: https://github.com/mikestir/webradio

[drom]

I can help with creating such a component if you are still interested.

[f4exb]

Sure! This has been more or less stalled due to other priorities but still a desirable feature.

[drom]

Do you have Idea about desired API or data format that component would accept?

[f4exb]

There were ideas listed above in my comments from last February but I didn't go further due to the lack of examples. I know OpenwebRX uses web sockets to transmit and render spectrum information. I am not against web sockets in this context if it facilitates implementation.

[f4exb]

If you look at the SDRangel counterpart https://github.com/f4exb/sdrangel/issues/224 I already had a look at possible implementation using WebRTC which could be nice but again was stuck because of lack of examples.

[f4exb]

The current implementation as an independent app works fine. It is perfectly and may be even more practical to have it in a separate tab in the browser.