3.7.13 Dots sample

Function dots is another way to draw irregular points. Dots use color scheme for coloring (see Color scheme). The sample code is:

int sample(mglGraph *gr)
{
  int i, n=2000;
  mglData x(n),y(n),z(n),c(n);
  for(i=0;i<n;i++)
  {
    mreal t=M_PI*(mgl_rnd()-0.5), f=2*M_PI*mgl_rnd();
    x.a[i] = 0.9*cos(t)*cos(f);
    y.a[i] = 0.9*cos(t)*sin(f);
    z.a[i] = 0.6*sin(t);
    c.a[i] = cos(2*t);
  }
  gr->SubPlot(2,2,0); gr->Title("Dots sample");  gr->Rotate(50,60);
  gr->Box();  gr->Dots(x,y,z);
  gr->Alpha(true);
  gr->SubPlot(2,2,1); gr->Title("add transparency"); gr->Rotate(50,60);
  gr->Box();  gr->Dots(x,y,z,c);
  gr->SubPlot(2,2,2); gr->Title("add coloring"); gr->Rotate(50,60);
  gr->Box();  gr->Dots(x,y,z,x,c);
  gr->SubPlot(2,2,3); gr->Title("Only coloring");gr->Rotate(50,60);
  gr->Box();  gr->Tens(x,y,z,x," .");
  return 0;
}