Draws a Bezier curve on the screen.
background(125);
noFill();
beginShape();
vertex(30, 20);
bezierVertex(80, 0, 80, 75, 30, 75);
endShape();
background(125);
beginShape();
vertex(30, 20);
bezierVertex(80, 0, 80, 75, 30, 75);
bezierVertex(50, 80, 60, 25, 30, 20);
endShape();