OpenGLUT 0.6.3 development - OpenGLUT: aargb.c File Reference
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# aargb.c File Reference

## Detailed Description

This program draws shows how to draw anti-aliased lines.

It draws two diagonal lines to form an X; when 'r' is typed in the window, the lines are rotated in opposite directions.

    /*
     * 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     * Unpublished-- rights reserved under the copyright laws of the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.
     */

    /*
     *  aargb.c
     */

    #include <GL/openglut.h>
    #include <stdlib.h>
    #include <stdio.h>

    static float rotAngle = 0.;

    /*  Initialize antialiasing for RGBA mode, including alpha
     *  blending, hint, and line width.  Print out implementation
     *  specific info on line width granularity and width.
     */
    void init(void)
    {
       GLfloat values[2];
       glGetFloatv (GL_LINE_WIDTH_GRANULARITY, values);
       printf ("GL_LINE_WIDTH_GRANULARITY value is %3.1f\n", values[0]);

       glGetFloatv (GL_LINE_WIDTH_RANGE, values);
       printf ("GL_LINE_WIDTH_RANGE values are %3.1f %3.1f\n",
          values[0], values[1]);

       glEnable (GL_LINE_SMOOTH);
       glEnable (GL_BLEND);
       glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
       glHint (GL_LINE_SMOOTH_HINT, GL_DONT_CARE);
       glLineWidth (1.5);

       glClearColor(0.0, 0.0, 0.0, 0.0);
    }

    /* Draw 2 diagonal lines to form an X
     */
    void display(void)
    {
       glClear(GL_COLOR_BUFFER_BIT);

       glColor3f (0.0, 1.0, 0.0);
       glPushMatrix();
       glRotatef(-rotAngle, 0.0, 0.0, 0.1);
       glBegin (GL_LINES);
          glVertex2f (-0.5, 0.5);
          glVertex2f (0.5, -0.5);
       glEnd ();
       glPopMatrix();

       glColor3f (0.0, 0.0, 1.0);
       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, w, 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,
     *  RGBA display mode, and handle input events.
     */
    int main(int argc, char** argv)
    {
       glutInit(&argc, argv);
       glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);
       glutInitWindowSize (200, 200);
       glutCreateWindow (argv[0]);
       init();
       glutReshapeFunc (reshape);
       glutKeyboardFunc (keyboard);
       glutDisplayFunc (display);
       glutMainLoop();
       return 0;
    }

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