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11.147 Sample ‘vect’ ¶

Function vect is most standard way to visualize vector fields – it draw a lot of arrows or hachures for each data cell. It have a lot of options which can be seen on the figure (and in the sample code), and use color scheme for coloring (see Color scheme).

MGL code:

call 'prepare2v'
call 'prepare3v'
subplot 3 2 0 '':title 'Vect plot (default)':box:vect a b
subplot 3 2 1 '':title '"." style; "=" style':box:vect a b '.='
subplot 3 2 2 '':title '"f" style':box:vect a b 'f'
subplot 3 2 3 '':title '">" style':box:vect a b '>'
subplot 3 2 4 '':title '"<" style':box:vect a b '<'
subplot 3 2 5:title '3d variant':rotate 50 60:box:vect ex ey ez

C++ code:

void smgl_vect3(mglGraph *gr)
{
	mglData ex,ey,ez;	mgls_prepare3v(&ex,&ey,&ez);
	if(big!=3)	{	gr->SubPlot(2,1,0);	gr->Title("Vect3 sample");	}
	gr->Rotate(50,60);	gr->SetOrigin(0,0,0);	gr->Axis("_xyz");	gr->Box();
	gr->Vect3(ex,ey,ez,"x");	gr->Vect3(ex,ey,ez);	gr->Vect3(ex,ey,ez,"z");
	if(big==3)	return;
	gr->SubPlot(2,1,1);	gr->Title("'f' style");
	gr->Rotate(50,60);	gr->SetOrigin(0,0,0);	gr->Axis("_xyz");	gr->Box();
	gr->Vect3(ex,ey,ez,"fx");	gr->Vect3(ex,ey,ez,"f");	gr->Vect3(ex,ey,ez,"fz");
	gr->Grid3(ex,"Wx");	gr->Grid3(ex,"W");	gr->Grid3(ex,"Wz");
}