Re: How do I draw a semicircle?

On Thu, May 13, 2021 at 2:55 PM Phil <[email protected]> wrote:

> Speedometer is rather complex plus the demo will not run because of an
> invalid encoding error.


an issue on gitHub might be good for that. -- but looking at the code may
be helpful nonetheless.


> I now have my meter working and now have to sort out how to incorporate
> it into it's own class. I have no idea how to do this, at the moment.
>

look at the wiki and various demos, but in short:

create a subclass of wxPanel

Create a method to draw the dial.

Call that method from The OnPaint handler to a method that draws your dial.

When the data changes, call Refesh() on your panel -- that will trigger a
Paint event, which will re-draw the dial.

You may want to have the dial itself be pre-saved to a bitmap, and then you
can just re-draw the needle on top of it when things change.

These are a bit old, but may help:

https://github.com/PythonCHB/wxPythonDemos

-CHB


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