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/*
* texas.c
*
* FUNCTION:
* Draws a brand in the shape of Texas. Both the handle, and the
* cross-section of the brand are in the shape of Texas.
*
* Note that the contours are specified in clockwise order.
* Thus, enabling backfacing polygon removal will cause the front
* polygons to disappear.
*
* HISTORY:
* -- created by Linas Vepstas October 1991
* -- heavily modified to draw more texas shapes, Feb 1993, Linas
* -- converted to use GLUT -- December 1995, Linas
* Copyright (c) 1991, 1993, 1995 Linas Vepstas <linas@linas.org>
*
*/
/* required include files */
#include <math.h>
#include <stdlib.h>
#include <GL/gl.h>
#include <GL/glut.h>
#include <GL/gle.h>
#include "main.h"
/* =========================================================== */
#define HNUM 4
double brand_points[HNUM][3];
float brand_colors [HNUM][3];
#define TSCALE 4.0
#define BPTS(x,y,z) { \
brand_points[i][0] = TSCALE * (x); \
brand_points[i][1] = TSCALE * (y); \
brand_points[i][2] = TSCALE * (z); \
i++; \
}
#define BCOLS(r,g,b) { \
brand_colors[i][0] = (r); \
brand_colors[i][1] = (g); \
brand_colors[i][2] = (b); \
i++; \
}
#define NUMPOINTS 18
double tspine[NUMPOINTS][3];
float tcolors [NUMPOINTS][3];
#define TPTS(x,y) { \
tspine[i][0] = TSCALE * (x); \
tspine[i][1] = TSCALE * (y); \
tspine[i][2] = TSCALE * (0.0); \
i++; \
}
#define TCOLS(r,g,b) { \
tcolors[i][0] = (r); \
tcolors[i][1] = (g); \
tcolors[i][2] = (b); \
i++; \
}
/* =========================================================== */
static void init_spine (void)
{
int i;
int ir, ig, ib;
float r, g, b;
i=0;
TPTS (-1.5, 2.0); /* panhandle */
TPTS (-0.75, 2.0);
TPTS (-0.75, 1.38);
TPTS (-0.5, 1.25);
TPTS (0.88, 1.12);
TPTS (1.0, 0.62);
TPTS (1.12, 0.1);
TPTS (0.5, -0.5);
TPTS (0.2, -1.12); /* corpus */
TPTS (0.3, -1.5); /* brownsville */
TPTS (-0.25, -1.45);
TPTS (-1.06, -0.3);
TPTS (-1.38, -0.3);
TPTS (-1.65, -0.6);
TPTS (-2.5, 0.5); /* midland */
TPTS (-1.5, 0.5);
TPTS (-1.5, 2.0); /* panhandle */
TPTS (-0.75, 2.0);
ir = ig = ib = 0;
for (i=0; i<NUMPOINTS; i++) {
ir += 33; ig +=47; ib +=89;
ir %= 255; ig %= 255; ib %= 255;
r = ((float) ir) / 255.0;
g = ((float) ig) / 255.0;
b = ((float) ib) / 255.0;
tcolors[i][0] = (r);
tcolors[i][1] = (g);
tcolors[i][2] = (b);
}
i=0;
BPTS (0.0, 0.0, 0.1);
BPTS (0.0, 0.0, 0.0);
BPTS (0.0, 0.0, -5.0);
BPTS (0.0, 0.0, -5.1);
i=0;
BCOLS (1.0, 0.3, 0.0);
BCOLS (1.0, 0.3, 0.0);
BCOLS (1.0, 0.3, 0.0);
BCOLS (1.0, 0.3, 0.0);
}
/* =========================================================== */
#define SCALE 0.8
#define BORDER(x,y) { \
double ax, ay, alen; \
texas_xsection[i][0] = SCALE * (x); \
texas_xsection[i][1] = SCALE * (y); \
if (i!=0) { \
ax = texas_xsection[i][0] - texas_xsection[i-1][0]; \
ay = texas_xsection[i][1] - texas_xsection[i-1][1]; \
alen = 1.0 / sqrt (ax*ax + ay*ay); \
ax *= alen; ay *= alen; \
texas_normal [i-1][0] = - ay; \
texas_normal [i-1][1] = ax; \
} \
i++; \
}
#define NUM_TEXAS_PTS (17)
double texas_xsection [NUM_TEXAS_PTS][2];
double texas_normal [NUM_TEXAS_PTS][2];
static void init_xsection (void)
{
int i;
/* outline of extrusion */
i=0;
BORDER (-0.75, 2.0);
BORDER (-0.75, 1.38);
BORDER (-0.5, 1.25);
BORDER (0.88, 1.12);
BORDER (1.0, 0.62);
BORDER (1.12, 0.1);
BORDER (0.5, -0.5);
BORDER (0.2, -1.12); /* corpus */
BORDER (0.3, -1.5); /* brownsville */
BORDER (-0.25, -1.45);
BORDER (-1.06, -0.3);
BORDER (-1.38, -0.3);
BORDER (-1.65, -0.6);
BORDER (-2.5, 0.5); /* midland */
BORDER (-1.5, 0.5);
BORDER (-1.5, 2.0); /* panhandle */
BORDER (-0.75, 2.0);
}
/* =========================================================== */
void InitStuff (void)
{
int style;
/* configure the pipeline */
init_spine ();
init_xsection ();
style = TUBE_JN_CAP;
style |= TUBE_CONTOUR_CLOSED;
style |= TUBE_NORM_FACET;
style |= TUBE_JN_ANGLE;
gleSetJoinStyle (style);
}
/* =========================================================== */
void DrawStuff (void) {
#ifdef IBM_GL_32
scale (1.8, 1.8, 1.8);
lmcolor (material_mode);
(void) extrusion (NUM_TEXAS_PTS-1, texas_xsection, texas_normal,
NULL, NUMPOINTS, tspine, tcolors);
(void) extrusion (NUM_TEXAS_PTS-1, texas_xsection, texas_normal,
NULL, HNUM, brand_points, brand_colors);
lmcolor (LMC_COLOR);
#endif
#define OPENGL_10
#ifdef OPENGL_10
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);
/* draw the brand and the handle */
gleExtrusion (NUM_TEXAS_PTS-1, texas_xsection, texas_normal,
NULL, NUMPOINTS, tspine, tcolors);
gleExtrusion (NUM_TEXAS_PTS-1, texas_xsection, texas_normal,
NULL, HNUM, brand_points, brand_colors);
glPopMatrix ();
glutSwapBuffers ();
}
#endif
/* ===================== END OF FILE ================== */
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