Initial revision

progs/redbook/aaindex.c

@@ -0,0 +1,153 @@
+/*
+ * Copyright (c) 1993-1997, Silicon Graphics, Inc.
+ * ALL RIGHTS RESERVED 
+ * Permission to use, copy, modify, and distribute this software for 
+ * any purpose and without fee is hereby granted, provided that the above
+ * copyright notice appear in all copies and that both the copyright notice
+ * and this permission notice appear in supporting documentation, and that 
+ * the name of Silicon Graphics, Inc. not be used in advertising
+ * or publicity pertaining to distribution of the software without specific,
+ * written prior permission. 
+ *
+ * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
+ * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
+ * FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL SILICON
+ * GRAPHICS, INC.  BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
+ * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
+ * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
+ * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
+ * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC.  HAS BEEN
+ * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
+ * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
+ * 
+ * US Government Users Restricted Rights 
+ * Use, duplication, or disclosure by the Government is subject to
+ * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
+ * (c)(1)(ii) of the Rights in Technical Data and Computer Software
+ * clause at DFARS 252.227-7013 and/or in similar or successor
+ * clauses in the FAR or the DOD or NASA FAR Supplement.
+ * Unpublished-- rights reserved under the copyright laws of the
+ * United States.  Contractor/manufacturer is Silicon Graphics,
+ * Inc., 2011 N.  Shoreline Blvd., Mountain View, CA 94039-7311.
+ *
+ * OpenGL(R) is a registered trademark of Silicon Graphics, Inc.
+ */
+
+/*
+ *  aaindex.c
+ *  This program draws shows how to draw anti-aliased lines in color
+ *  index mode. It draws two diagonal lines to form an X; when 'r' 
+ *  is typed in the window, the lines are rotated in opposite 
+ *  directions.
+ */
+#include <GL/glut.h>
+#include "stdlib.h"
+
+#define RAMPSIZE 16
+#define RAMP1START 32
+#define RAMP2START 48
+
+static float rotAngle = 0.;
+
+/*  Initialize antialiasing for color index mode,
+ *  including loading a green color ramp starting
+ *  at RAMP1START, and a blue color ramp starting
+ *  at RAMP2START. The ramps must be a multiple of 16.
+ */
+void init(void)
+{
+   int i;
+
+   for (i = 0; i < RAMPSIZE; i++) {
+      GLfloat shade;
+      shade = (GLfloat) i/(GLfloat) RAMPSIZE;
+      glutSetColor(RAMP1START+(GLint)i, 0., shade, 0.);
+      glutSetColor(RAMP2START+(GLint)i, 0., 0., shade);
+   }
+
+   glEnable (GL_LINE_SMOOTH);
+   glHint (GL_LINE_SMOOTH_HINT, GL_DONT_CARE);
+   glLineWidth (1.5);
+
+   glClearIndex ((GLfloat) RAMP1START);
+}
+
+/*  Draw 2 diagonal lines to form an X
+ */
+void display(void)
+{
+   glClear(GL_COLOR_BUFFER_BIT);
+
+   glIndexi(RAMP1START);
+   glPushMatrix();
+   glRotatef(-rotAngle, 0.0, 0.0, 0.1);
+   glBegin (GL_LINES);
+      glVertex2f (-0.5, 0.5);
+      glVertex2f (0.5, -0.5);
+   glEnd ();
+   glPopMatrix();
+
+   glIndexi(RAMP2START);
+   glPushMatrix();
+   glRotatef(rotAngle, 0.0, 0.0, 0.1);
+   glBegin (GL_LINES);
+      glVertex2f (0.5, 0.5);
+      glVertex2f (-0.5, -0.5);
+   glEnd ();
+   glPopMatrix();
+
+   glFlush();
+}
+
+void reshape(int w, int h)
+{
+   glViewport(0, 0, (GLsizei) w, (GLsizei) h);
+   glMatrixMode(GL_PROJECTION);
+   glLoadIdentity();
+   if (w <= h) 
+      gluOrtho2D (-1.0, 1.0, 
+         -1.0*(GLfloat)h/(GLfloat)w, 1.0*(GLfloat)h/(GLfloat)w);
+   else 
+      gluOrtho2D (-1.0*(GLfloat)w/(GLfloat)h, 
+         1.0*(GLfloat)w/(GLfloat)h, -1.0, 1.0);
+   glMatrixMode(GL_MODELVIEW);
+   glLoadIdentity();
+}
+
+/* ARGSUSED1 */
+void keyboard(unsigned char key, int x, int y)
+{
+   switch (key) {
+      case 'r':
+      case 'R':
+         rotAngle += 20.;
+         if (rotAngle >= 360.) rotAngle = 0.;
+         glutPostRedisplay();	
+         break;
+      case 27:  /*  Escape Key */
+         exit(0);
+         break;
+      default:
+         break;
+    }
+}
+
+/*  Main Loop
+ *  Open window with initial window size, title bar, 
+ *  color index display mode, and handle input events.
+ */
+int main(int argc, char** argv)
+{
+   glutInit(&argc, argv);
+   glutInitDisplayMode (GLUT_SINGLE | GLUT_INDEX);
+   glutInitWindowSize (200, 200);
+   glutCreateWindow (argv[0]);
+   init();
+   glutReshapeFunc (reshape);
+   glutKeyboardFunc (keyboard);
+   glutDisplayFunc (display);
+   glutMainLoop();
+   return 0;
+}