2.7.10 ContF projection sample

Functions contfz, contfy, contfx, draw filled contours on plane perpendicular to corresponding axis. One of possible application is drawing projections of 3D field. The sample code is:

int sample(mglGraph *gr)
{
  mglData c;  mgls_prepare3d(&c);
  gr->Title("Cont[XYZ] sample");  gr->Rotate(50,60);
  gr->Box();  gr->ContFX(c.Sum("x"),"",-1);
  gr->ContFY(c.Sum("y"),"",1);  gr->ContFZ(c.Sum("z"),"",-1);
  return 0;
}

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