Re: How to shift surface?

[Stefan Salewski <mail ssalewski de>]

On Mon, 2018-06-11 at 08:29 +0100, Göran Hasse wrote:
> Hello!
>
> I am trying to write a gtk + Cairo application that mimics the
> animation in 
> wikipedias sine graph.
>
> https://en.wikipedia.org/wiki/File:Circle_cos_sin.gif

There was posted an example some time ago -- in multiple versions.
First one did only clear and redraw -- which gave high CPU load. An
improved version of Uli Schlachter used shifting of display to reduce
load. A Nim version of first simple redraw is available here:

https://github.com/StefanSalewski/gintro

Various C codes you may find in this thread, I think first Uli
Schlachter post has a link to the most advanced C version.