I am looking for an app that allows me to make quick and simple sketches of two-D figures with such things as straight lines, arrows, rectangles, etc, with an extremely simpe interface. I think it probably should be a vector graphics app, but most of the ones I have seen (and I have several) are too compex for what I have in mind. I just want to make simple sketches to support handwritten notes. Note Taker HD has such tools, but its zoom window can't be repositioned to my satisfaction. Notability is a good note taking app (as are several others) but its graphic tools aren't very good. Can anyone make a recommendation? I have tried a lot of note taking apps, as well as several vector graphics apps. Thanks.