aho_01_drawing.pde

size(300,300);
background(255,0,0);

ellipseMode(CENTER_DIAMETER);
rectMode(CENTER_DIAMETER);

noFill();
stroke(255,255,255);
ellipse(150,150, 100,100);

noStroke();
fill(255,255,255);
ellipse(150,150, 50,50);

noFill();
stroke(0,0,0);
rect(150,150, 200,200);