Shape Primitives.

The basic shape primitive functions are triangle(), rect(), quad(), and ellipse(). Squares are made with rect() and circles are made with ellipse(). Each of these functions requires a number of parameters which determines their position and size.

 
size(200, 200);
smooth(); 
background(0);
noStroke();
fill(226);
triangle(10, 10, 10, 200, 45, 200);
rect(45, 45, 35, 35);
quad(105, 10, 120, 10, 120, 200, 80, 200);
ellipse(140, 80, 40, 40);
triangle(160, 10, 195, 200, 160, 200);