Rant about drawing a circle.

[Alain De Vos]

First ai hallucinates. Many languages , gui toolkits exists.
With commoder 64 , go graphical mode . y-axis * howmuch + xaxis -> poke color.
Now you are into oblivion.
I found a way , dlang+gtk but no obvious.
[ I need a label ,input box & a circle, when you click , return event , ....]

 

[MG]

SDL could do it If the surface is the entire program window. Xorg copy/paste in that like gtk windows is probably a challenge...
You can also make a mono bitmap circle in anything with arrays. Set a quarter of the circle bits according to cosine and rotate/copy that to 3 other parts of the circle. The program still needs a pixel draw function.

 

[Alain De Vos]

My question was about good "gui api's". So maybe SDL will do.

 

[MG]

My question was about good "gui api's". So maybe SDL will do.

It's actually really sad that we can't just define a rectangle on the display and do things in it with level 0 machine operation instead of requiring an OS-level API.

 

[Alain De Vos]

So i want to boot my computer , afterwards on place (50,50) I want a blue dot. Not easy

 

[blackbird9]

Bresehham's circle drawing algo:

Bresenham’s circle drawing algorithm - GeeksforGeeks

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Try writing an implementation in zig.