I can't understand how the camera is working. It's a 2D game, so I'm displaying a game map from (0, 0, 0) to (mapSizeX, 0, mapSizeY).

I'm initializing the camera as follow :

Camera::Camera(void)
  : position_(0.0f, 0.0f, 0.0f), rotation_(0.0f, 0.0f, -1.0f)
{}

void            Camera::initialize(void)
{
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  glTranslatef(position_.x, position_.y, position_.z);
  gluPerspective(70.0f, 800.0f/600.0f, 1.0f, 10000.0f);
  gluLookAt(0.0f, 6000.0f, 0.0f,
            0.0f, 0.0f, -1.0f,
            0.0f, 1.0f, 0.0f);
  glMatrixMode(GL_MODELVIEW);
  glLoadIdentity();
  glEnable(GL_DEPTH_TEST);
  glDepthFunc(GL_LEQUAL);
}

So the camera is looking down. I currently see the up right border of the map in the center of my window and the map expand to the down left border of my window. I would like to center the map.

The logical thing to do should be to move the camera to eyeX = mapSizeX / 2 and the same for z. My map has 10 x 10 cases with CASE = 400, so I should have :

gluLookAt((10 / 2) * CASE /* = 2000 */, 6000.0f, (10 / 2) * CASE /* = 2000 */,
            0.0f, 0.0f, -1.0f,
            0.0f, 1.0f, 0.0f);

But that doesn't move the camera, but seems to rotate it.

Am I doing something wrong?

EDIT :

I tried that:

gluLookAt(2000.0f, 6000.0f, 0.0f,
            2000.0f, 0.0f, -1.0f,
            0.0f, 1.0f, 0.0f);

Which correctly moves the map in the middle of the window in width. But I can't move if correctly in height. It always returns the axis Z. When I go up, It goes down and the same for right and left.

I don't see the map anymore when I do :

gluLookAt(2000.0f, 6000.0f, 2000.0f,
                2000.0f, 0.0f, 2000.0f,
                0.0f, 1.0f, 0.0f);