### 19.1.1 The graphic screen

A graphic screen, either two- or 3D as appropriate, automatically opens in response to a graphic command. Alternatively, you can open a graphic screen with its own command line with keystrokes; Alt+G for a 2D screen and Alt+H for a 3D screen. The graphic screen will have an array of buttons at the top right.

- Red arrows move the image in the x direction.
- Green arrows move the image in the y direction.
- Blue arrows zoom in and out in a 2D screen, and move the image in the z direction in a 3D screen.
- in and out buttons zoom in and out.
- ⊥ button orthonormalizes the graphic.
- button stops and restarts animations.
- auto button scales the image automatically.
- cfg button brings up the configuration screen (see Section 2.5.7).
- M button brings up a menu. The menu has the following submenus:
  View
    which has entries which do the same as the buttons.
  Trace
    for working with traces.
  Animation
    for working with animations.
  3D
    for working with 3D graphics.
  Export/Print
    for exporting and printing the graphic.

The image can also be moved in the screen by clicking and dragging with the mouse. Scrolling with the mouse will zoom the images in and out.