I created this Graph for 4-Point Panoramic Perspective images.
I have created Two tutorials which involve this graph. One is on the creation of this graph, so you can make your own, and the other is on how to use this graph.
Graph Tutorial: [link]
4-Point Panoramic Perspective Tutorial: [link]
Download this graph and print it either on 2 sheets or 1 sheet of paper (depending how large you want it). You can even open it in PhotoShop, illustrator or your favorite application program. Just use it as a background layer and draw on a new layer using your tablet.
If you wish for the original PDF let me know and i will upload it.
Please inform me if you use this graph, i would love to see what you do with it.