Generating contour lines from regularly spaced data

Question

I am currently working on a data visualization project.My aim is to produce contour lines ,in other words iso-lines, from gridded data.Data can be temperature, weather data or any kind of other environmental parameters but only condition is it must be regularly spaced. I searched in internet , however i could not find a good algorithm, pseudo-code or source code for producing contour lines from grids. Does anybody knows a library, source code or an algorithm for producing contour lines from gridded data? it will be good if your suggestion has a good run time performance, i don't want to wait my users so much :)

Edit: thanks for response but isolines have some constrains like they should not intersects so just generating bezier curves does not accomplish my goal.

Answer 1

See this question: How to approximate a vector contour from an elevation raster?

It's a near duplicate, but uses quite different terminology. You'll find that cartography and computer graphics solve many of the same problems, but use different terminology for them.