Can MathGL draw a circle(-segment)?

[SImon]

Maybe a stupid question, but:

can MathGL draw a simple circle-part in a Cartesian plot? Or should I use y =
sqrt( r - x^2 ).

Thanks ;)

[Alexey Balakin]

Easily, just use this code

float phi1=M_PI/4, phi2=M_PI, phi;
mglData x(30), y(30);
for(int i=0;i<30;i++)
{ phi=phi1+(phi2-phi1)*i/29.;  x.a[i]=cos(phi);  y.a[i]=sin(phi);  }
gr->Plot(x,y);

or you can do the same using textual formulas

gr->Plot("cos(pi/4+(pi-pi/4)*t)", "cos(pi/4+(pi-pi/4)*t)","0");

[SImon]

Of course! :D

Thank you!