Hi, my name's Michael, and I'm new to the mailing list, so forgive me if I'm asking this question in the wrong place.
I'm trying to using the GNU Scientific Library (GSL) to draw a smooth path from A to B. I'm using an API that returns a small number (8 in this case) of irregularly spaced points (in red), that you can see picture [1]. The purple points represent the points that I would like to see returned from GSL. Firstly, is this kind of 2D B-Spline shape obtainable by using GSL? I don't know much about B-Splines, let alone 2D B-Splines. I was able to get the B-Splines example at link [2] running and creating a smooth .ps file without problem, but that example uses uniform breakpoints with the following code: /* use uniform breakpoints on [0, 15] */ gsl_bspline_knots_uniform(0.0, 15.0, bw); In my case, given that the data I'm given is erratic and not evenly spaced, would I have to use non-uniform knots? I tried using `gsl_bspline_knots()`, in order to use non uniform breakpoints within the following test code, but I'm really not sure if this is the right direction or not. #define NCOEFFS 8 // not sure what this number should be - number of data points? #define NBREAK (NCOEFFS - 2) const size_t nbreak = NBREAK; int main (void) { // (example code)... gsl_vector *non_uniform = gsl_vector_alloc(nbreak); // create some random breakpoint values for (i=0; i<nbreak; i++) { double val = gsl_ran_gaussian(r, 2.0); printf("val: %f\n", val); gsl_vector_set(non_uniform, i, val); } gsl_bspline_knots(non_uniform, bw); // (more example code)... } Further more, how would I translate the above example for drawing B-Splines in a 2D x/y coordinate space? If GNU Scientific Library is not suitable for this, could someone make a recommendation for a more suitable C/C++ library? Any help or pointers in the direction would be much appreciated. [1]: http://i.stack.imgur.com/mpxbx.png [2]: http://www.gnu.org/software/gsl/manual/html_node/Example-programs-for-B_002dsplines.html#Example-programs-for-B_002dsplines PS, I have also asked this question at Stack Overflow too: http://stackoverflow.com/questions/24194909/using-gnu-scientific-library-gsl-to-draw-a-2d-b-spline-path-using-unevenly-spa -- Michael Petrie Mobile Developer +64 21 022 99121 michael.pet...@stqry.com *Get the STQRY *www.stqry.com