How to find a value from a graph image in .gif format
posted 11 years ago
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 javaapplet? 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!