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