Simple_opengl_problem

struct OpenGLWindow : GLCtrl {
    Point point;

    virtual void GLPaint()
    {
    StdView();
    //glClearColor(10.0,  20.0,  10.0,  1.0);
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glMatrixMode (GL_PROJECTION);
    glLoadIdentity ();
    gluOrtho2D (0.0,xsfact*(float)xs, ysfact*(float)ys, 0.0);
    if (enable_draw)
        {
        int i=0;
        while (i<xs)
            {
            int j=0;
            while(j<ys)
                {
                glBegin(GL_POINTS);
                float tmp_gl=gl_matrix[i][j];
                glColor3f(tmp_gl,tmp_gl,tmp_gl);
                glVertex2f(i,j);
                glEnd();
                j++;
                }
            i++;
            }

        };
    glFlush();
    }
};