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/* -*-ePiX-*- */
#include <epix.h>
using namespace ePiX;
const int MAX(18);
// basic circular wave
double ripple(double u, double v)
{
return pow(Cos(0.5*sqrt(u*u+v*v)),2);
}
// superposition
double f(double u, double v)
{
return 0.25*(1+ripple(u, v-10) + ripple(u, v+10));
}
// f as a parametric surface
P F(double u, double v)
{
return P(u, v, f(u,v));
}
// height-dependent coloring
P color(double u, double v, double w)
{
return P(0.2+0.8*w, 0.3, 0.8 - 0.6*w);
}
domain R(P(-MAX,-MAX), P(MAX,MAX), mesh(2*MAX, 2*MAX));
int main()
{
picture(P(-MAX,-MAX), P(MAX,MAX), "3x3in");
begin();
pen(Magenta(1.4), 0.2);
surface(F, R, color);
pst_format();
end();
}
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