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11.32 Sample ‘contv’ ¶

Function contv draw vertical cylinders (belts) at contour lines.

MGL code:

call 'prepare2d'
list v -0.5 -0.15 0 0.15 0.5
subplot 2 2 0:title 'ContV plot (default)':rotate 50 60:box:contv a
subplot 2 2 1:title 'manual levels':rotate 50 60:box:contv v a
subplot 2 2 2:title '"\_" style':rotate 50 60:box:contv a '_'
subplot 2 2 3:title 'ContV and ContF':rotate 50 60:light on:box
contv a:contf a:cont a 'k'

C++ code:

void smgl_contv(mglGraph *gr)
{
	mglData a,v(5);	mgls_prepare2d(&a);	v.a[0]=-0.5;
	v.a[1]=-0.15;	v.a[2]=0;	v.a[3]=0.15;	v.a[4]=0.5;
	if(big!=3)	{	gr->SubPlot(2,2,0);	gr->Title("ContV plot (default)");	}
	gr->Rotate(50,60);	gr->Box();	gr->ContV(a);
	if(big==3)	return;
	gr->SubPlot(2,2,1);	gr->Title("manual levels");
	gr->Rotate(50,60);	gr->Box();	gr->ContV(v,a);
	gr->SubPlot(2,2,2);	gr->Title("'\\_' style");
	gr->Rotate(50,60);	gr->Box();	gr->ContV(a,"_");
	gr->SubPlot(2,2,3);	gr->Title("ContV and ContF");
	gr->Rotate(50,60);	gr->Box();	gr->Light(true);
	gr->ContV(a);	gr->ContF(a);	gr->Cont(a,"k");
}