www.pudn.com > openglbk.rar > lines.c

/* 
 * Copyright (c) 1993-1999, 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 * Unpublished-- rights reserved under the copyright laws of the 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. 
 */ 
 
/* 
 *  lines.c 
 *  This program demonstrates geometric primitives and 
 *  their attributes. 
 */ 
#include  
#include  
 
#define drawOneLine(x1,y1,x2,y2)  glBegin(GL_LINES);  \ 
   glVertex2f ((x1),(y1)); glVertex2f ((x2),(y2)); glEnd(); 
 
void init(void)  
{ 
   glClearColor (0.0, 0.0, 0.0, 0.0); 
   glShadeModel (GL_FLAT); 
} 
 
void display(void) 
{ 
   int i; 
 
   glClear (GL_COLOR_BUFFER_BIT); 
 
/* select white for all lines  */ 
   glColor3f (1.0, 1.0, 1.0); 
 
/* in 1st row, 3 lines, each with a different stipple  */ 
   glEnable (GL_LINE_STIPPLE); 
    
   glLineStipple (1, 0x0101);  /*  dotted  */ 
   drawOneLine (50.0, 125.0, 150.0, 125.0); 
   glLineStipple (1, 0x00FF);  /*  dashed  */ 
   drawOneLine (150.0, 125.0, 250.0, 125.0); 
   glLineStipple (1, 0x1C47);  /*  dash/dot/dash  */ 
   drawOneLine (250.0, 125.0, 350.0, 125.0); 
 
/* in 2nd row, 3 wide lines, each with different stipple */ 
   glLineWidth (5.0); 
   glLineStipple (1, 0x0101);  /*  dotted  */ 
   drawOneLine (50.0, 100.0, 150.0, 100.0); 
   glLineStipple (1, 0x00FF);  /*  dashed  */ 
   drawOneLine (150.0, 100.0, 250.0, 100.0); 
   glLineStipple (1, 0x1C47);  /*  dash/dot/dash  */ 
   drawOneLine (250.0, 100.0, 350.0, 100.0); 
   glLineWidth (1.0); 
 
/* in 3rd row, 6 lines, with dash/dot/dash stipple  */ 
/* as part of a single connected line strip         */ 
   glLineStipple (1, 0x1C47);  /*  dash/dot/dash  */ 
   glBegin (GL_LINE_STRIP); 
   for (i = 0; i < 7; i++) 
      glVertex2f (50.0 + ((GLfloat) i * 50.0), 75.0); 
   glEnd (); 
 
/* in 4th row, 6 independent lines with same stipple  */ 
   for (i = 0; i < 6; i++) { 
      drawOneLine (50.0 + ((GLfloat) i * 50.0), 50.0, 
         50.0 + ((GLfloat)(i+1) * 50.0), 50.0); 
   } 
 
/* in 5th row, 1 line, with dash/dot/dash stipple    */ 
/* and a stipple repeat factor of 5                  */ 
   glLineStipple (5, 0x1C47);  /*  dash/dot/dash  */ 
   drawOneLine (50.0, 25.0, 350.0, 25.0); 
 
   glDisable (GL_LINE_STIPPLE); 
   glFlush (); 
} 
 
void reshape (int w, int h) 
{ 
   glViewport (0, 0, (GLsizei) w, (GLsizei) h); 
   glMatrixMode (GL_PROJECTION); 
   glLoadIdentity (); 
   gluOrtho2D (0.0, (GLdouble) w, 0.0, (GLdouble) h); 
} 
 
void keyboard(unsigned char key, int x, int y) 
{ 
   switch (key) { 
      case 27: 
         exit(0); 
         break; 
   } 
} 
 
int main(int argc, char** argv) 
{ 
   glutInit(&argc, argv); 
   glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB); 
   glutInitWindowSize (400, 150);  
   glutInitWindowPosition (100, 100); 
   glutCreateWindow (argv[0]); 
   init (); 
   glutDisplayFunc(display);  
   glutReshapeFunc(reshape); 
   glutKeyboardFunc(keyboard); 
   glutMainLoop(); 
   return 0; 
}