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##
Grid

The Settings->Grid submenu allows you to change the
settings:

- Settings->Grid->Show Grid will toggle between displaying the
  on the
  and hiding it. If there is enough memory available, the grid will be stored as a bitmap in order to improve redraw speed.

- Settings->Grid->Lock Grid will toggle between locking and unlocking the grid. If the grid is locked, mouse clicks will be translated to the nearest tick mark. This means that if you use a mouse click to set the location of a
  when constructing a
  , the point will be placed at the nearest tick mark. This also means that when you move a point while in |
  |, the point will be moved in intervals of the gap between tick marks. Note that locking the grid does not affect the keyboard or menu driven functions, such as Navigate->Go To... (`F5`) or emulate a mouse click (`F4`).

  When the grid is locked, the
  will show the image otherwise it will show the image .

  Warning: if you lock the grid, you will be unable to use the mouse to select narrow
  that lie between tick marks as mouse clicks will be translated to the nearest tick mark, unless you use the drag rectangle (which may select other objects as well). Similarly, if the size of the control points is less than the gap between the tick marks, you will not be able to select control points using the mouse whilst in |
  |. (You will however be able to select them using the Next Control (`F6`) popup menu item.)

- Settings->Grid->Grid Settings... will produce a dialog box in which you can specify the position of the tick marks and the units used. You can either use a rectangular grid with the origin at the top left hand corner of the
  (Figure 3.1(a)), or you can use a radial grid with the origin at the center of the canvas (Figure 3.1(b)).

  (a)
  (b)
  Figure 3.1: Available grids: (a) rectangular grid; (b) radial grid

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