Hover, tweeningSets, rebound, scroll time, debug

notes.md

@@ -14,3 +14,10 @@ Click events:
 * Continue with drawPolygon
 
 Make a better points data structure with x and y keys.
+
+For debugging, display a line of the intended path for each point.
+  * Run the whole tween function in one tick, drawing a single pixel along
+
+If lines make a connected polygon, shade the inside of it with the average color
+of all vertices composing the polygon. The more distant the points (and the
+larger the polygon) the more dark the color is shaded.