Sets the style for rendering line endings. These ends are either squared, extended, or rounded, each of which specified with the corresponding parameters: SQUARE, PROJECT, and ROUND. The default cap is ROUND.

To make point() appear square, use strokeCap(PROJECT). Using strokeCap(SQUARE) (no cap) causes points to become invisible.

• size(400, 400);
  strokeWeight(48.0);
  strokeCap(ROUND);
  line(80, 120, 320, 120);
  strokeCap(SQUARE);
  line(80, 200, 320, 200);
  strokeCap(PROJECT);
  line(80, 280, 320, 280);

  

• cap(int)either SQUARE, PROJECT, or ROUND