Question for anybody who knows iPad apps: I've got an iPad 2. I'm trying to put together a classroom activity where I'll show the graph of a function on the screen and projector, then have a student use the stylus to try to draw the graph of the derivative on the same axes, then press some button that will show the actual graph of the derivative so that they can see how closely it matches up to the sketch. I tried putting this together as an applet in GeoGebra, but the pen tool there doesn't really work the way I need it to. I can see how to do this using a bunch of image files -- display file 1 with the graph, have student draw on it, then display file 2 transparently over file 1 and the drawing. I'll have a whole bunch of these pairs of pictures. What would be a good program to do this with? I've been using Notetaker HD for a lot of things, but it doesn't seem like it will do the transparency for the second picture like I need.

Wow. I'm flummoxed. Sounds like you need a drawing program of some sort. Why don't you contact TUAW and ask them this question. They would probably love to research it for you.

Hil,

What about the ipad app "Explain Everything?"

Hmm. That looks like it might work. I'll play around with it some and see what it'll do. Thanks! (And actually, even if it doesn't work quite right for this, I can see several other things that I think I could use it for.)

Yeah, I was running around evernote website and I saw this and thought this might be what you needed.

Depending on exactly what it can do (I'll have to play around and test out the features), and whether campus tech ever fixes the projector in my classroom, this could be the solution to several of my "I wish I could do that, but I'd need a SmartBoard" problems.

After playing around with it some, it looks like it won't do the overlays that I wanted (or, at least, not in any way that I can figure out), but it does enough other stuff that I think I can work around that.

Hil,

I wonder if you could have someone draw, upload that picture to dropbox/evernote, then import the pic back to put on top the original figure using this app or another picture app.

Hil,

like this app:

[link]

That would work, but I think it would take too long. If I'm doing the overlays, I want it to be instant -- draw the derivative, then compare it to the actual derivative graph. I'm going to be doing a whole bunch of them in a row, with different students taking turns, and importing and exporting like that would be too long a delay. I can have them draw on one slide, then the next slide shows the actual derivative graph, and just go back and forth between them to compare them.