/**
 * Points and Lines. 
 * 
 * Points and lines can be used to draw basic geometry.
 * Change the value of the variable 'd' to scale the form.
 * The four variables set the positions based on the value of 'd'. 
 */
 
int d = 70;
int p1 = d;
int p2 = p1+d;
int p3 = p2+d;
int p4 = p3+d;

size(640, 360);
noSmooth();
background(0);
translate(140, 0);

// Draw gray box
stroke(153);
line(p3, p3, p2, p3);
line(p2, p3, p2, p2);
line(p2, p2, p3, p2);
line(p3, p2, p3, p3);

// Draw white points
stroke(255);
point(p1, p1);
point(p1, p3); 
point(p2, p4);
point(p3, p1); 
point(p4, p2);
point(p4, p4);