3 * helicoid (gernalized torus) demo
6 * This code provides a very simple example of the helicoid primitive.
7 * Most of this code is required to set up OpenGL and GLUT, and very
8 * very little to set up the helix drawer. Don't blink!
10 * =======> MOUSE HOOKED UP TO AFFINE < ========
13 * Written by Linas Vepstas, March 1995
16 #include "extrusion.h"
18 /* controls shape of object */
22 void InitStuff_helix4 (void)
26 /* draw the helix shape */
27 void DrawStuff_helix4 (void)
30 double delta_affine[2][3];
32 glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
33 glColor3f (0.7, 0.5, 0.3);
35 /* set up some matrices so that the object spins with the mouse */
37 /* glTranslatef (0.0, 0.0, -80.0); */
38 /* glRotatef (220.0, 0.0, 1.0, 0.0); */
39 /* glRotatef (65.0, 1.0, 0.0, 0.0); */
41 /* Phew. FINALLY, Draw the helix -- */
42 affine [0][0] = 1.0/ (0.01*lastx);
45 affine [1][1] = 0.01*lastx;
49 delta_affine [0][0] = 0.0;
50 delta_affine [1][0] = 0.03*lasty;
51 delta_affine [0][1] = -0.03*lasty;
52 delta_affine [1][1] = 0.0;
53 delta_affine [0][2] = 0.0;
54 delta_affine [1][2] = 0.0;
56 gleSetJoinStyle (TUBE_NORM_EDGE | TUBE_JN_ANGLE | TUBE_JN_CAP);
57 gleHelicoid (1.0, 7.0, -1.0,
58 -4.0, 6.0, affine, delta_affine, 0.0, 980.0);
63 /* ------------------------- end of file ----------------- */