size(400,400);

background(255);

ellipse(200,200,100,100);

//lisser les traits
smooth();

strokeWeight(4);
ellipse(100,100,80,80);

//un point
point(200,200);

//un quadrilatère
quad(5, 5, 5, 20, 40, 40, 60, 0);

//remplissage avec transparence
fill(255,10,10,100);

//couper les jointures
strokeJoin(BEVEL);

//une forme en triangle strip
beginShape(TRIANGLE_STRIP);
vertex(230, 220);
vertex(385, 220);
vertex(385, 375);
vertex(230, 275);
vertex(200, 375);
vertex(180, 375);
endShape(CLOSE);

//une forme normale : triangle
beginShape();
vertex(30, 20);
vertex(85, 20);
vertex(85, 75);
endShape();

//avec des courbes
beginShape();
curveVertex(130, 20);
curveVertex(185, 20);
curveVertex(185, 75);
curveVertex(155, 105);
curveVertex(120, 150);
curveVertex(100, 130);
endShape(CLOSE);