Using the following program, you are to add your own display function.  This display function will simply draw three lines of your choosing to the screen.
 
 

UNIX VERSION (Windows Below)

/*#####################################*/ /*Description:   program to draw three red lines*/ /*   to a GLUT window  that is 500x500 pixels*/ /*Author:  L. Grewe                                       */ /* UNIX VERSION                                         */ /*Date: 1-1-99                                               */ /*#####################################*/   #include <GL/gl.h> #include <GL/glut.h> #include <stdlib.h> #include <stdio.h> #include <math.h> /*Function prototypes*/ GLvoid display(GLvoid); GLvoid myinit(GLvoid);          void main(int argc, char **argv)       {           glutInit(&argc,argv); /*init.  GLUT window sys.*/           /*there will be a single buffered  window displaying RGB */           glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);           glutInitWindowSize(500,500);   /*size in pixels  */          glutInitWindowPosition(0,0);   /* located lower-left of screen */           /*Create the window using the setup from the previous glut calls*/           glutCreateWindow("Lines Example");  /*title=Lines Example*/           /*tell system what function will be in charge of displaying*/           glutDisplayFunc(display);             /*Call another function to further initialize window contents*/           myinit();           /*this call causes to go in infinite loop waiting for window i/o */           glutMainLoop();       }               /*#####################################*/       /*myinit:  this function clears the background of the */       /*  graphics system and sets up the drawing color to */       /*  red.  Finally, viewing parameters are set.             */       /*#####################################*/       GLvoid myinit(GLvoid)       {            /*white background  */           glClearColor(1.0,1.0,1.0,0.0);           /*drawing color red  */          glColor3f(1.0,0.0,0.0);           /*Viewing Configuration  */          glMatrixMode(GL_PROJECTION);  /*says will specify project.  */          glLoadIdentity();   /*load identity matrix.*/           gluOrtho2D(0.0,500.0, 0.0, 500.0);  /*specifies Othographic proj*/            /*Shift to Model Specification Model  */         glMatrixMode(GL_MODELVIEW);       }            Show your work to your instructor.

  Solution
 
 
 
 

Windows VERSION

/*#####################################*/ /*Description:   program to draw three red lines*/ /*   to a GLUT window  that is 500x500 pixels*/ /*Author:  L. Grewe                                       */ /* Windows VERSION                                         */ /*Date: 1-1-99                                               */ /*#####################################*/   #include <windows.h> #include <GL\Gl.h> #include <GL\glut.h> #include <stdlib.h>   #include <stdio.h> #include <math.h> /*Function prototypes*/ GLvoid display(GLvoid); GLvoid myinit(GLvoid);          void main(int argc, char **argv)       {           glutInit(&argc,argv); /*init.  GLUT window sys.*/           /*there will be a single buffered  window displaying RGB */           glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);           glutInitWindowSize(500,500);   /*size in pixels  */          glutInitWindowPosition(0,0);   /* located lower-left of screen */           /*Create the window using the setup from the previous glut calls*/           glutCreateWindow("Lines Example");  /*title=Lines Example*/           /*tell system what function will be in charge of displaying*/           glutDisplayFunc(display);             /*Call another function to further initialize window contents*/           myinit();           /*this call causes to go in infinite loop waiting for window i/o */           glutMainLoop();       }               /*#####################################*/       /*myinit:  this function clears the background of the */       /*  graphics system and sets up the drawing color to */       /*  red.  Finally, viewing parameters are set.             */       /*#####################################*/       GLvoid myinit(GLvoid)       {            /*white background  */           glClearColor(1.0,1.0,1.0,0.0);           /*drawing color red  */          glColor3f(1.0,0.0,0.0);           /*Viewing Configuration  */          glMatrixMode(GL_PROJECTION);  /*says will specify project.  */          glLoadIdentity();   /*load identity matrix.*/           gluOrtho2D(0.0,500.0, 0.0, 500.0);  /*specifies Othographic proj*/            /*Shift to Model Specification Model  */         glMatrixMode(GL_MODELVIEW);       }            Show your work to your instructor.