[no parameter]
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Invoke the Grid/Snap dialog box.
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options
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A string of characters which allow you to activate and deactivate the grid display and various snap options:
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hor size
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Horizontal resolution of the grid, i.e. the horizontal distance between each point on the grid
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vert size
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Vertical equivalent of hor_size. If vert_size is not specified then it will be the same as hor_size, e.g. to change the grid to a 2mm square use the macro tdgrid 2mm .
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angle snap
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Angular snap value (in degrees)
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grid gravity
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How close the mouse cursor shown on the screen must come to a snap point before snapping to it.
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