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<TITLE>Magic-7.3 Command Reference</TITLE>
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<H1> <IMG SRC=graphics/magic_title2.gif ALT="Magic VLSI Layout Tool Version 7.3">
<IMG SRC=graphics/magic_OGL_sm.gif ALIGN="top" ALT="*"> </H1>
<H2>grid</H2>
<HR>
Toggle the grid lines on or off, and set grid parameters
<HR>
<H3>Shortcuts:</H3>
<BLOCKQUOTE>
Key macro <B>g</B> implements the command <B>grid</B> (with no arguments).
Key macro <B>G</B> implements the command <B>grid 2</B>.
</BLOCKQUOTE>
<H3>Usage:</H3>
<BLOCKQUOTE>
<B>grid</B> [<I>option</I>]<BR><BR>
<BLOCKQUOTE>
where <I>option</I> may be one of the following:
<DL>
<DT> <I>x_spacing</I> [<I>y_spacing</I> [<I>x_origin</I>
<I>y_origin</I>]]
<DD> set the grid to the indicated spacing, where all
spacing and origin values are any valid <B>magic</B>
<A HREF=distance.html><I>distance</I></A> value.
<DT> <B>on</B>|<B>off</B>
<DD> Set the visibility of the grid on or off, as indicated.
<DT> <B>state</B>
<DD> Report the state (on or off) of the grid. In the Tcl
version, this is returned as a boolean value (0 or 1).
<DT> <B>box</B>
<DD> Report the box (rectangle) of the unit grid, in magic
internal coordinates.
<DT> <B>help</B>
<DD> Print usage information on the <B>grid</B> command.
</DL>
</BLOCKQUOTE>
</BLOCKQUOTE>
<H3>Summary:</H3>
<BLOCKQUOTE>
The <B>grid</B> command has two purposes: to draw a reference grid
on the screen as an aid to layout placement, and to define a snap
grid of arbitrary (and not necessarily square) units. This second
use works in conjunction with the <B>snap</B> command; with the
invocation of <B>snap grid</B> (or, equivalently, <B>snap user</B>),
standard magic dimensions for commands such as <B>move</B>, <B>copy</B>,
<B>box</B>, <B>stretch</B>, and mouse-button movement of the cursor
box are parsed as integer divisions of the user grid. The grid does
not have to be visible ("<B>grid on</B>") for the snap function to be
enabled. <P>
Note that the grid has both spacing values and an offset; unlike the
lambda grid, which is always aligned to the internal coordinate system,
the user grid may be any value; for grid spacings that are not a
multiple of internal or lambda values, the grid may need to be
offset from the origin to get the desired alignment. To do this,
specify the <I>x_origin</I> and <I>y_origin</I> values, which
describe the offset of the grid origin from the internal coordinate
system origin. <P>
Usually there is no reason to have different <I>x_spacing</I> and
<I>y_spacing</I> values (only one spacing value is required for
both). However, occasionally it may be useful to define something
like the following:
<BLOCKQUOTE>
<B>grid 150um 3l; snap grid</B>
</BLOCKQUOTE>
This example makes it easy to draw a number of horizontal routing
lines aligned to a pad cell spacing of 150 microns. <P>
Note that even when the grid is set to visible, at a large enough
zoom factor, where the grid lines become dense, the grid will not
be drawn. <P>
<B>grid</B> with no arguments toggles the visibility of the grid
lines on the screen.
</BLOCKQUOTE>
<H3>Implementation Notes:</H3>
<BLOCKQUOTE>
<B>grid</B> is implemented as a built-in window command in <B>magic</B>.
</BLOCKQUOTE>
<H3>See Also:</H3>
<BLOCKQUOTE>
<A HREF=snap.html><B>snap</B></A> <BR>
</BLOCKQUOTE>
<P><IMG SRC=graphics/line1.gif><P>
<TABLE BORDER=0>
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<TD> <A HREF=commands.html>Return to command index</A>
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<P><I>Last updated:</I> November 7, 2004 at 3:24pm <P>
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