aaindex.c
上传用户:xk288cn
上传日期:2007-05-28
资源大小:4876k
文件大小:5k
- /*
- * 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- * Unpublished-- rights reserved under the copyright laws of the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;
- }