1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
#include<stdlib.h>
#include<stdio.h>
#include<time.h>
#include<GL/glut.h>

void init ( void ){
     glClearColor ( 1.0, 1.0, 1.0, 0.0 );
     glMatrixMode ( GL_PROJECTION );
     gluOrtho2D ( 0.0, 100.0, 0.0, 150.0 );
}

void DrawPOLYGON (void)
{
    glClear (GL_COLOR_BUFFER_BIT);
    glColor3f (0.0, 1.0, 0.0);      
    glBegin(GL_POLYGON);
        glVertex2i (10,10);       
        glVertex2i (50,10);
        glVertex2i (50,80);
        glVertex2i (10,80);     
    glEnd ( );
        /* glLineWidth(2.0f);
         glColor3f (0.0, 0.0, 1.0);
         glBegin ( GL_LINES );
         glVertex2i ( 10, 10 );
         glVertex2i ( 50, 10 );
         glVertex2i ( 50, 80 );
         glVertex2i ( 10, 80 );
         glVertex2i ( 50, 10 );
         glVertex2i ( 50, 80 );
         glVertex2i ( 10, 80 );
         glVertex2i ( 10, 10 );
     glEnd ();*/
    glFlush ( );     
}





int main ( int argc, char**argv ){
    glutInit ( &argc, argv );
    glutInitWindowSize(400,300);
    glutInitWindowPosition(50,100);
    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB );
    glutCreateWindow("B0329029");
    
    init ();

    glutDisplayFunc (DrawPOLYGON);
    glutMainLoop ();
}