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11.98 Sample ‘projection5’ ¶

Example of plot projection in ternary coordinates (ternary=5).

MGL code:

ranges 0 1 0 1 0 1
new x 50 '0.25*(1+cos(2*pi*x))'
new y 50 '0.25*(1+sin(2*pi*x))'
new z 50 'x'
new a 20 30 '30*x*y*(1-x-y)^2*(x+y<1)'
new rx 10 'rnd':new ry 10:fill ry '(1-v)*rnd' rx
light on

title 'Projection sample (ternary)':ternary 5:rotate 50 60
box:axis:grid
plot x y z 'r2':surf a '#'
xlabel 'X':ylabel 'Y':zlabel 'Z'

C++ code:

void smgl_projection5(mglGraph *gr)	// flag #
{
	gr->SetRanges(0,1,0,1,0,1);
	mglData x(50),y(50),z(50),rx(10),ry(10), a(20,30);
	a.Modify("30*x*y*(1-x-y)^2*(x+y<1)");
	x.Modify("0.25*(1+cos(2*pi*x))");
	y.Modify("0.25*(1+sin(2*pi*x))");
	rx.Modify("rnd"); ry.Modify("(1-v)*rnd",rx);
	z.Modify("x");

	if(big!=3)	gr->Title("Projection sample (ternary)");
	gr->Ternary(5);
	gr->Rotate(50,60);		gr->Light(true);
	gr->Plot(x,y,z,"r2");	gr->Surf(a,"#");
	gr->Axis(); gr->Grid();	gr->Box();
	gr->Label('x',"X",1);	gr->Label('y',"Y",1);	gr->Label('z',"Z",1);
}