size(400,400);
background(255,255,255);

fill(255,255,0);
stroke(0,0,255);

rect(100,100, 200,200);
point(150,150);
line(120,120, 280,120);

fill(255,0,0);

// Could be CORNER
ellipseMode(CENTER_DIAMETER);
ellipse(200,200, 50,50);

rectMode(CENTER_DIAMETER);
noFill();
rect(200,200, 50,50);