progs/redbook/lines.c

   1 /*
   2  * Copyright (c) 1993-1997, Silicon Graphics, Inc.
   3  * ALL RIGHTS RESERVED
   4  * Permission to use, copy, modify, and distribute this software for
   5  * any purpose and without fee is hereby granted, provided that the above
   6  * copyright notice appear in all copies and that both the copyright notice
   7  * and this permission notice appear in supporting documentation, and that
   8  * the name of Silicon Graphics, Inc. not be used in advertising
   9  * or publicity pertaining to distribution of the software without specific,
  10  * written prior permission.
  11  *
  12  * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
  13  * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
  14  * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
  15  * FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL SILICON
  16  * GRAPHICS, INC.  BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
  17  * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
  18  * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
  19  * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
  20  * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC.  HAS BEEN
  21  * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
  22  * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
  23  * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
  24  *
  25  * US Government Users Restricted Rights
  26  * Use, duplication, or disclosure by the Government is subject to
  27  * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
  28  * (c)(1)(ii) of the Rights in Technical Data and Computer Software
  29  * clause at DFARS 252.227-7013 and/or in similar or successor
  30  * clauses in the FAR or the DOD or NASA FAR Supplement.
  31  * Unpublished-- rights reserved under the copyright laws of the
  32  * United States.  Contractor/manufacturer is Silicon Graphics,
  33  * Inc., 2011 N.  Shoreline Blvd., Mountain View, CA 94039-7311.
  34  *
  35  * OpenGL(R) is a registered trademark of Silicon Graphics, Inc.
  36  */
  37
  38 /*
  39  *  lines.c
  40  *  This program demonstrates geometric primitives and
  41  *  their attributes.
  42  */
  43 #include <GL/glut.h>
  44 #include <stdlib.h>
  45
  46 #define drawOneLine(x1,y1,x2,y2)  glBegin(GL_LINES);  \
  47    glVertex2f ((x1),(y1)); glVertex2f ((x2),(y2)); glEnd();
  48
  49 static void init(void)
  50 {
  51    glClearColor (0.0, 0.0, 0.0, 0.0);
  52    glShadeModel (GL_FLAT);
  53 }
  54
  55 static void display(void)
  56 {
  57    int i;
  58
  59    glClear (GL_COLOR_BUFFER_BIT);
  60
  61 /* select white for all lines  */
  62    glColor3f (1.0, 1.0, 1.0);
  63
  64 /* in 1st row, 3 lines, each with a different stipple  */
  65    glEnable (GL_LINE_STIPPLE);
  66
  67    glLineStipple (1, 0x0101);  /*  dotted  */
  68    drawOneLine (50.0, 125.0, 150.0, 125.0);
  69    glLineStipple (1, 0x00FF);  /*  dashed  */
  70    drawOneLine (150.0, 125.0, 250.0, 125.0);
  71    glLineStipple (1, 0x1C47);  /*  dash/dot/dash  */
  72    drawOneLine (250.0, 125.0, 350.0, 125.0);
  73
  74 /* in 2nd row, 3 wide lines, each with different stipple */
  75    glLineWidth (5.0);
  76    glLineStipple (1, 0x0101);  /*  dotted  */
  77    drawOneLine (50.0, 100.0, 150.0, 100.0);
  78    glLineStipple (1, 0x00FF);  /*  dashed  */
  79    drawOneLine (150.0, 100.0, 250.0, 100.0);
  80    glLineStipple (1, 0x1C47);  /*  dash/dot/dash  */
  81    drawOneLine (250.0, 100.0, 350.0, 100.0);
  82    glLineWidth (1.0);
  83
  84 /* in 3rd row, 6 lines, with dash/dot/dash stipple  */
  85 /* as part of a single connected line strip         */
  86    glLineStipple (1, 0x1C47);  /*  dash/dot/dash  */
  87    glBegin (GL_LINE_STRIP);
  88    for (i = 0; i < 7; i++)
  89       glVertex2f (50.0 + ((GLfloat) i * 50.0), 75.0);
  90    glEnd ();
  91
  92 /* in 4th row, 6 independent lines with same stipple  */
  93    for (i = 0; i < 6; i++) {
  94       drawOneLine (50.0 + ((GLfloat) i * 50.0), 50.0,
  95          50.0 + ((GLfloat)(i+1) * 50.0), 50.0);
  96    }
  97
  98 /* in 5th row, 1 line, with dash/dot/dash stipple    */
  99 /* and a stipple repeat factor of 5                  */
 100    glLineStipple (5, 0x1C47);  /*  dash/dot/dash  */
 101    drawOneLine (50.0, 25.0, 350.0, 25.0);
 102
 103    glDisable (GL_LINE_STIPPLE);
 104    glFlush ();
 105 }
 106
 107 static void reshape (int w, int h)
 108 {
 109    glViewport (0, 0, (GLsizei) w, (GLsizei) h);
 110    glMatrixMode (GL_PROJECTION);
 111    glLoadIdentity ();
 112    gluOrtho2D (0.0, (GLdouble) w, 0.0, (GLdouble) h);
 113 }
 114
 115 /* ARGSUSED1 */
 116 static void keyboard(unsigned char key, int x, int y)
 117 {
 118    switch (key) {
 119       case 27:
 120          exit(0);
 121          break;
 122    }
 123 }
 124
 125 int main(int argc, char** argv)
 126 {
 127    glutInit(&argc, argv);
 128    glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);
 129    glutInitWindowSize (400, 150);
 130    glutInitWindowPosition (100, 100);
 131    glutCreateWindow (argv[0]);
 132    init ();
 133    glutDisplayFunc(display);
 134    glutReshapeFunc(reshape);
 135    glutKeyboardFunc(keyboard);
 136    glutMainLoop();
 137    return 0;
 138 }