Stroke and fill a circle, uses the stroke color set in stroke() and the fill color set in fill().
YourScreen.circle(x, y, diameter)
Nothing
YourScreen.beginDraw();
YourScreen.clear();
YourScreen.noStroke();
YourScreen.fill(255, 255, 0);
YourScreen.circle(YourScreen.width()/2, YourScreen.height()/2, YourScreen.height());
YourScreen.endDraw();