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igala net

OpenGL A view that displays my entire model?

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I have seen this FAQs: How can I automatically calculate a view that displays my entire model? http://www.opengl.org/resources/faq/technical/viewing.htm But this code does not run (for me), does any one know where is error on my code? I cannot see any thing on the screen with this code.
void Viewer::initGLES(){
	glClearColor(0.f ,1.0f, 1.0f, 1.f);
	glDisable(GL_DEPTH_TEST);
	float diam = 1500;
	float zNear = 1.3f;
	float zFar = zNear + diam;
	
	int cx = 0, cy = 0, cz = 0;
	
	float left = cx - diam;
	float right = cx + diam;
	float bottom = cy - diam;
	float top = cy + diam;
	
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	
	float aspect = iScreenWidth / iScreenHeight; // 240 x 320
	
	if ( aspect < 1.0 ) { // window taller than wide
		bottom /= aspect;
		top /= aspect;
	} else {
		left *= aspect;
		right *= aspect;
	}	
	
	//glOrtho(left, right, bottom, top, zNear, zFar);
	glOrthof(left, right, bottom, top, zNear, zFar);
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	
	//gluLookAt(0., 0., 2.*diam, cx, cy, cz, 0.0, 1.0, 0.0);
}
//------------------------------------
void Viewer::drawFP(){
	glClear(GL_COLOR_BUFFER_BIT);
	glLoadIdentity();
	glEnableClientState(GL_VERTEX_ARRAY);
	//glTranslatef            (0,0,-5.f);
	
	glColor4f(0,1,0,1);
	
	static const GLfloat vertices[3 * 3] =
	{
	     -1000,    1000,    0,
	      1000,   -1000,    0,
	      1000,    1000,    0
	};
	
	glVertexPointer( 3, GL_FLOAT, 0, vertices );
	
	glDrawArrays( GL_LINES, 0, 3);
}
Thanks all,

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