I didn't found it until now.

I use scal translate and rotate to change coordinates.

I need to get the positon of the mouse in those coordinates.

Any SIMPLE SOLUTION ?

I draw some mathematical functions and the screen after scaling has a size of 1x1 .
So I must set the font size to something like 0.05 or 0.1 etc.

But when setting a size of 0.5 it works, smaller sizes generate an error.

I have some code that draws ellipses and rectangles.

If the code is inside the setup() it is ok.

If the code is inside draw() then ellipses and rectangles aren't drawed. Some other shapes are drawed ( so that means that the code passes from there ).
The example is simple, is there any reason for that ?

Thanks !