Hi @Aryszin,
In Windows, the title bar can be customized using the Windows API in C#: Title bar customization - Windows apps | Microsoft Learn
You can access the java.awt.Frame
instance like this and modify it’s shape for example (you can make it transparent here) :
import processing.awt.PSurfaceAWT;
import java.awt.Frame;
import java.awt.geom.Ellipse2D;
void setup() {
size(500, 500);
PSurfaceAWT.SmoothCanvas canvas = (PSurfaceAWT.SmoothCanvas)(surface.getNative());
Frame frame = canvas.getFrame();
frame.removeNotify();
frame.setUndecorated(true);
frame.setShape(new Ellipse2D.Double(0, 0, width, height));
frame.addNotify();
}
But I don’t know if the Java API can access and modify the style of the title bar. You might want to investigate more: