http://ftp.x.org/contrib/applications/xscreensaver-3.19.tar.gz

[xscreensaver] / hacks / glx / extrusion-helix4.c

diff --git a/hacks/glx/extrusion-helix4.c b/hacks/glx/extrusion-helix4.c
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+++ b/hacks/glx/extrusion-helix4.c
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+
+/* 
+ * helicoid (gernalized torus) demo 
+ *
+ * FUNCTION:
+ * This code provides a very simple example of the helicoid primitive.
+ * Most of this code is required to set up OpenGL and GLUT, and very
+ * very little to set up the helix drawer. Don't blink!
+ *
+ * =======> MOUSE HOOKED UP TO AFFINE < ========
+ *
+ * HISTORY:
+ * Written by Linas Vepstas, March 1995
+ */
+
+/* required include files */
+#include <GL/gl.h>
+#include <GL/glut.h>
+#include <GL/tube.h>
+
+/*  most recent mouse postion */
+extern float lastx;
+extern float lasty;
+extern float rot_x;
+extern float rot_y;
+extern float rot_z;
+
+void InitStuff_helix4 (void) 
+{
+}
+
+/* draw the helix shape */
+void DrawStuff_helix4 (void) 
+{
+   double affine[2][3];
+   double delta_affine[2][3];
+
+   glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+   glColor3f (0.7, 0.5, 0.3);
+
+   /* set up some matrices so that the object spins with the mouse */
+   glPushMatrix ();
+   glTranslatef (0.0, 0.0, -80.0);
+   glRotatef(rot_x, 1, 0, 0);
+   glRotatef(rot_y, 0, 1, 0);
+   glRotatef(rot_z, 0, 0, 1);
+/*     glRotatef (220.0, 0.0, 1.0, 0.0); */
+/*     glRotatef (65.0, 1.0, 0.0, 0.0); */
+
+   /* Phew. FINALLY, Draw the helix  -- */
+   affine [0][0] = 1.0/ (0.01*lastx);
+   affine [1][0] = 0.0;
+   affine [0][1] = 0.0;
+   affine [1][1] = 0.01*lastx;
+   affine [0][2] = 0.0;
+   affine [1][2] = 0.0;
+
+   delta_affine [0][0] = 0.0;
+   delta_affine [1][0] = 0.03*lasty;
+   delta_affine [0][1] = -0.03*lasty;
+   delta_affine [1][1] = 0.0;
+   delta_affine [0][2] = 0.0;
+   delta_affine [1][2] = 0.0;
+
+   gleSetJoinStyle (TUBE_NORM_EDGE | TUBE_JN_ANGLE | TUBE_JN_CAP);
+   gleHelicoid (1.0, 7.0, -1.0, 
+               -4.0, 6.0, affine, delta_affine, 0.0, 980.0);
+
+   glPopMatrix ();
+
+}
+/* ------------------------- end of file ----------------- */