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How to find a value from a graph image in .gif format  RSS feed

Ed Comstock
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Hi all,
May be an odd question, but here goes. I have a .gif image of a 'nomograph', which is basically a graph with a scale at the top and bottom and a line between the scales with a results value. You select a value on the top row, then the bottom row, draw a line between the two, and the intersection on the third line is your value. Being new to this, my questions are:
1) How can I relate the values on the scales of the .gif file to
an object that can be used in a java applet?
2) I could probably just do this visually by allowing the user to draw
a line themselves between scale A and B, and then just read the
result on line C. But, is there a way for java to interpolate a
value when a line intersects another line? Ex:
Scale A : 100-200-300-4*0-500-600-700
Line w/ values: --1--2--3--4-*5--6--7--8--0--10
Scale B : 1000-2000-300*-4000-5000-6000
So, scale A is 400, scale B is 3000, the line between the scales
is the row of *'s, and the result from the intersection should be
approx 4.9 (just before the value 5). So, this is all on a .gif
file, but can you draw a line on the .gif to derive an answer?
Any help would be greatly appreciated!
It is sorta covered in the JavaRanch Style Guide.
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