full regeneration

docs/chapters/boundingbox/bbox.js

@@ -18,6 +18,9 @@ draw() {
     curve.drawCurve();
     curve.drawPoints();
 
+    // Start with complete nonsense min/max values, where
+    // min is huge and max is tiny, so we can bring them
+    // down and up, respectively.
 
     let minx = Number.MAX_SAFE_INTEGER,
         miny = minx,
@@ -28,6 +31,7 @@ draw() {
     noFill();
     setStroke(`red`);
 
+    // For each extremum, see if that changes the bbox values.
     [0, ...extrema.x, ...extrema.y, 1].forEach(t => {
         let p = curve.get(t);
         if (p.x < minx) minx = p.x;
@@ -37,6 +41,7 @@ draw() {
         if (t > 0 && t< 1) circle(p.x, p.y, 3);
     });
 
+    // And we're done.
     setStroke(`#0F0`);
     rect(minx, miny, maxx - minx, maxy - miny);
 }