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/*
* FILE:
* cone.c
*
* FUNCTION:
* Baisc demo illustrating how to write code to draw
* the most basic cone shape.
*
* HISTORY:
* Linas Vepstas March 1995
* Copyright (c) 1995 Linas Vepstas <linas@linas.org>
*/
/* required include files */
#include <GL/gl.h>
#include <GL/glut.h>
#include <GL/gle.h>
#include "main.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);
}
/* 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 ------------------- */
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