How to make geometrical shapes ?

[RetroAndDev]

Hello, i want to make geometrical shapes (like a circle or a rounded rectangle) on cosmos, do you have ideas ?

[quajak]

The first step is drawing an arc/circle the code Cosmos uses to draw a circle is here

Cosmos/source/Cosmos.System2/Graphics/Canvas.cs

Line 331 in 1e4cbb6

public virtual void DrawCircle(Pen pen, int x_center, int y_center, int radius)

. It uses the Midpoint circle algorith https://en.wikipedia.org/wiki/Midpoint_circle_algorithm.
There is currently no way to draw an arc in cosmos, which should be added. The same algorithm can be used for this.
A rounded rectangle can be made up of a few arcs and straight lines and I think more complex shapes can be built up from lines and arcs.