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-rw-r--r--graphics/epix/samples/twisted_cubic.xp106
1 files changed, 0 insertions, 106 deletions
diff --git a/graphics/epix/samples/twisted_cubic.xp b/graphics/epix/samples/twisted_cubic.xp
deleted file mode 100644
index 8e9ec5d4b7..0000000000
--- a/graphics/epix/samples/twisted_cubic.xp
+++ /dev/null
@@ -1,106 +0,0 @@
-/* -*-ePiX-*- */
-#include "epix.h"
-using namespace ePiX;
-
-const double MAX(2.5);
-
-const double XMIN(-2);
-
-// twisted cubic
-P cubic(double t)
-{
- return t*P(1, t, t*t);
-}
-
-// projections to coordinate planes
-P cubic12(double t)
-{
- const P arg(cubic(t));
- return P(arg.x1(), arg.x2(), XMIN);
-}
-
-P cubic13(double t)
-{
- const P arg(cubic(t));
- return P(arg.x1(), XMIN, arg.x3());
-}
-
-P cubic23(double t)
-{
- const P arg(cubic(t));
- return P(XMIN, arg.x2(), arg.x3());
-}
-
-// draw lines from one path to another
-void bars(P f1(double), P f2(double))
-{
- for (int i=0; i<=20; ++i)
- line(f1(-1+0.1*i), f2(-1+0.1*i));
-}
-
-// code to draw entire figure
-void draw_frame()
-{
- // (x,z)-plane
- blue();
- bbold();
- plot(cubic13, -1, 1, 60);
- plain();
- bars(cubic13, cubic);
- label(cubic13(1), P(0,2), "$x$-$z$", t);
-
- // (y,z)-plane
- green(0.6);
- bbold();
- plot(cubic23, -1, 1, 60);
- plain();
- bars(cubic23, cubic);
- label(cubic23(1), P(0,2), "$y$-$z$", t);
-
- // (x,y)-plane
- magenta();
- bbold();
- plot(cubic12, -1, 1, 60);
- plain();
- bars(cubic12, cubic);
- label(cubic12(1), P(2,0), "$x$-$y$",r);
-
- // the cubic
- bold(Red(1.6));
- base(Red(0.6), "2pt");
- plot(cubic, -1, 1, 60);
-}
-
-int main()
-{
- picture(P(-1,0), P(1.25,1), "4.5 x 2in");
-
- begin();
-
- screen scr_left(P(-MAX,-MAX), P(MAX,MAX));
- activate(scr_left);
-
- border(Black(), "1pt");
-
- camera.at(sph(10, 0.8, 0.5));
- camera.look_at(P(0,0,-0.25));
-
- draw_frame();
- base(Neutral());
-
- screen scr_right(P(-MAX,-MAX), P(MAX,MAX));
- activate(scr_right);
-
- border(Black(), "1pt");
-
- camera.at(sph(10, 0.9, 0.5));
- camera.look_at(P(0,0,-0.25));
-
- draw_frame();
-
- inset(scr_left, P(0.25,0), P(1.25,1));
- inset(scr_right, P(-1,0), P(0,1));
-
- end();
-}
-