OpenEuphoria

RE: SV: pathing.

• Posted by cetaylor at compuserve.com Sep 12, 2002
• 366 views

Personally, I think b-spline produces a nicer curve than Bezier.  The 
math isn't as elegant, but the result is better.

Colin Taylor


OthelloVivaldi at hotmail.com wrote:
> 
> Colin, 
> 
> Vega.e is just beautiful. The explode_spline() routine was much faster 
> than my Bezier curve. When drawn on a pixel screen, the two curves 
> almost exactly overwrite each other. The following compares the two 
> routines (numbers in seconds on a 350MHz PII, code is appended below):
> 
> Spline          BB_graph
> 
> 0.660000        1.040000
> 0.660000        1.100000
> 0.710000        1.050000
> 0.710000        1.100000
> 0.770000        1.040000
> 
> In addition to this, your 'splines' can also deal with any number of 
> coordinates as input, not just 4 points. I take my hat off. 
> 
> To improve on this, I guess one would have to look for some way to do it 
> with only integers. Hmmmmm... 
> 
> 
> -- Test code:
> 
> include vega.e
> include bb_graph.e
> 
> sequence s, p
> constant WH = {800, 600}, NUM = 100, RESO = 1000
> constant TEST_SET = rand(repeat(repeat(WH, 4), NUM)) - 1
> atom t
> set_curve_res(RESO)
> puts(1, "\nSpline\t\tBB_graph\n\n")
> for k = 1 to 5 do
>     t = time()
>     for j = 1 to NUM do
>         p = TEST_SET[j]
>         s = explode_spline(p)
>     end for
>     t = time() - t printf(1, "%f\t", t)
>     t = time()
> 
>     for j = 1 to NUM do
>         p = TEST_SET[j]
>         s = Bezier_curve(RESO, p[1], p[2], p[3], p[4])
>     end for
>     t = time() - t printf(1, "%f\n", t)
> end for
> 
> 
> Yours Sincerely,
> Barabarella
> 
>