LINES.C

/* 
 * (c) Copyright 1993, Silicon Graphics, Inc. 
 *               1993-1995 Microsoft Corporation 
 * 
 * ALL RIGHTS RESERVED 
 * 
 * Please refer to OpenGL/readme.txt for additional information 
 * 
 */ 
 
/* 
 *  lines.c   
 *  This program demonstrates different line stipples and widths. 
 */ 
#include "glos.h" 
 
#include <GL/gl.h> 
#include <GL/glu.h> 
#include <GL/glaux.h> 
 
void myinit(void); 
void CALLBACK display(void); 
 
#define drawOneLine(x1,y1,x2,y2) glBegin(GL_LINES); \ 
    glVertex2f ((x1),(y1)); glVertex2f ((x2),(y2)); glEnd(); 
 
void myinit (void) { 
    /*  background to be cleared to black   */ 
    glClearColor (0.0, 0.0, 0.0, 0.0); 
    glShadeModel (GL_FLAT); 
} 
 
void CALLBACK display(void) 
{ 
    int i; 
 
    glClear (GL_COLOR_BUFFER_BIT); 
/*  draw all lines in white */ 
    glColor3f (1.0, 1.0, 1.0); 
 
/*  in 1st row, 3 lines drawn, 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 drawn, each with different stipple */ 
    glLineWidth (5.0); 
    glLineStipple (1, 0x0101); 
    drawOneLine (50.0, 100.0, 150.0, 100.0); 
    glLineStipple (1, 0x00FF); 
    drawOneLine (150.0, 100.0, 250.0, 100.0); 
    glLineStipple (1, 0x1C47); 
    drawOneLine (250.0, 100.0, 350.0, 100.0); 
    glLineWidth (1.0); 
 
/*  in 3rd row, 6 lines drawn, with dash/dot/dash stipple,  */ 
/*  as part of a single connect line strip          */ 
    glLineStipple (1, 0x1C47); 
    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 drawn,  */ 
/*  with dash/dot/dash 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 drawn, with dash/dot/dash stipple    */ 
/*  and repeat factor of 5          */ 
    glLineStipple (5, 0x1C47); 
    drawOneLine (50.0, 25.0, 350.0, 25.0); 
    glFlush (); 
} 
 
/*  Main Loop 
 *  Open window with initial window size, title bar,  
 *  RGBA display mode, and handle input events. 
 */ 
int main(int argc, char** argv) 
{ 
    auxInitDisplayMode (AUX_SINGLE | AUX_RGB); 
    auxInitPosition (0, 0, 400, 150); 
    auxInitWindow ("Lines"); 
    myinit (); 
    auxMainLoop(display); 
    return(0); 
}