Bar graph emulation

[Riconec]

I need to plot array data and to overcome lacking of such functions I did:

• created curve for each array index as vertical sticks with 50 pen size
• have message with consecutive indexes (e.g from 0 to 15, array of 16 elements) which are constant over time
• each curve uses constant index as it's X value

It looks something like this:

| |
| | |
| | | | |

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BUT, each time new data come it plots in the same coordinate (since X is fixed for each curve) without clearing previous value (even if I have circular buffer with size of 1). So if I have 50 value it will stay 50 (even if actual data is 10) until bigger value appear. In this case it will become bigger and going back to 50 won't decrease bar size.

Can I somehow clean plot each time new data received?