why isn't this a square???

#include <GL/gl.h>
#include <GL/glut.h>

static GLdouble points[]={
        0.25,0.25,0.0,
        0.75,0.25,0.0,
        0.75,0.75,0.0,
        0.25,0.75,0.0};

void display(void){
        glEnableClientState(GL_VERTEX_ARRAY);
        glVertexPointer(3,GL_DOUBLE,0,points);
        glClear(GL_COLOR_BUFFER_BIT);
        glColor3f(0.0,0.0,1.0);
        glBegin(GL_POLYGON);
                glArrayElement(1);
                glArrayElement(2);
                glArrayElement(3);
                glArrayElement(4);
        glEnd();
        glFlush();
}
void init(void){
        glClearColor(0.0,0.0,0.0,0.0);
        glShadeModel(GL_FLAT);
}

int main(int argc,char **argv){
        glutInit(&argc,argv);
        glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);
        glutInitWindowSize(250,250);
        glutInitWindowPosition(100,100);
        glutCreateWindow("Melancoly");
        init();
        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
        glOrtho(0.0,1.0,0.0,1.0,-1.0,1.0);
        glutDisplayFunc(display);
        glutMainLoop();
        return 0;
}

Just another beginner question it comes out almost as a square, but has a triangle attached to the bottom.

Originally posted by grimoire:
[b]

        glBegin(GL_POLYGON);
                glArrayElement(1);
                glArrayElement(2);
                glArrayElement(3);
                glArrayElement(4);
        glEnd();

[/b]
Array indices start with zero, not one, as is customary in C

ahhhh i hate that:)

You should know that- not hate.