2.6.3 SurfA sample

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

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

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