3.6.2 SurfC sample

Function surfc is similar to surf but its coloring is determined by another data. The sample code is:

int sample(mglGraph *gr)
{
  mglData a,b;  mgls_prepare2d(&a,&b);
  gr->Title("SurfC plot");  gr->Rotate(50,60);
  gr->Light(true);  gr->Box();  gr->SurfC(a,b);
  return 0;
}