cone.c
上传用户:xk288cn
上传日期:2007-05-28
资源大小:4876k
文件大小:2k
- /*
- * cone drawing demo
- *
- * FUNCTION:
- * Baisc demo illustrating how to write code to draw
- * the most basic cone shape.
- *
- * HISTORY:
- * Linas Vepstas March 1995
- */
- /* required include files */
- #include <GL/glut.h>
- #include <GL/tube.h>
- /* the arrays in which we will store out polyline */
- #define NPTS 6
- double radii [NPTS];
- double points [NPTS][3];
- float colors [NPTS][3];
- int idx = 0;
- /* some utilities for filling that array */
- #define PNT(x,y,z) {
- points[idx][0] = x;
- points[idx][1] = y;
- points[idx][2] = z;
- idx ++;
- }
- #define COL(r,g,b) {
- colors[idx][0] = r;
- colors[idx][1] = g;
- colors[idx][2] = b;
- }
- #define RAD(r) {
- radii[idx] = r;
- }
- /*
- * Initialize a bent shape with three segments.
- * The data format is a polyline.
- *
- * NOTE that neither the first, nor the last segment are drawn.
- * The first & last segment serve only to determine that angle
- * at which the endcaps are drawn.
- */
- void InitStuff (void) {
- /* initialize the join style here */
- gleSetJoinStyle (TUBE_NORM_EDGE | TUBE_JN_ANGLE | TUBE_JN_CAP);
- RAD (1.0);
- COL (0.0, 0.0, 0.0);
- PNT (-6.0, 6.0, 0.0);
- RAD (1.0);
- COL (0.0, 0.8, 0.3);
- PNT (6.0, 6.0, 0.0);
- RAD (3.0);
- COL (0.8, 0.3, 0.0);
- PNT (6.0, -6.0, 0.0);
- RAD (0.5);
- COL (0.2, 0.3, 0.9);
- PNT (-6.0, -6.0, 0.0);
- RAD (2.0);
- COL (0.2, 0.8, 0.5);
- PNT (-6.0, 6.0, 0.0);
- RAD (1.0);
- COL (0.0, 0.0, 0.0);
- PNT (6.0, 6.0, 0.0);
- }
- extern float lastx;
- extern float lasty;
- /* draw the polycone shape */
- void DrawStuff (void) {
- glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
- /* set up some matrices so that the object spins with the mouse */
- glPushMatrix ();
- glTranslatef (0.0, 0.0, -80.0);
- glRotatef (lastx, 0.0, 1.0, 0.0);
- glRotatef (lasty, 1.0, 0.0, 0.0);
- /* Phew. FINALLY, Draw the polycone -- */
- glePolyCone (idx, points, colors, radii);
- glPopMatrix ();
- glutSwapBuffers ();
- }
- /* --------------------------- end of file ------------------- */