116 lines
4.1 KiB
HTML
116 lines
4.1 KiB
HTML
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<HTML>
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<HEAD>
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<STYLE type="text/css">
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H1 {color: black }
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H2 {color: maroon }
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H3 {color: #007090 }
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A.head:link {color: #0060a0 }
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A.head:visited {color: #3040c0 }
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A.head:active {color: white }
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A.head:hover {color: yellow }
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A.red:link {color: red }
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A.red:visited {color: maroon }
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A.red:active {color: yellow }
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</STYLE>
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</HEAD>
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<TITLE>Magic-7.3 Command Reference</TITLE>
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<BODY BACKGROUND=graphics/blpaper.gif>
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<H1> <IMG SRC=graphics/magic_title2.gif ALT="Magic VLSI Layout Tool Version 7.3">
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<IMG SRC=graphics/magic_OGL_sm.gif ALIGN="top" ALT="*"> </H1>
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<H2>grid</H2>
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<HR>
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Toggle the grid lines on or off, and set grid parameters
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<HR>
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<H3>Shortcuts:</H3>
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<BLOCKQUOTE>
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Key macro <B>g</B> implements the command <B>grid</B> (with no arguments).
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Key macro <B>G</B> implements the command <B>grid 2</B>.
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</BLOCKQUOTE>
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<H3>Usage:</H3>
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<BLOCKQUOTE>
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<B>grid</B> [<I>option</I>]<BR><BR>
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<BLOCKQUOTE>
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where <I>option</I> may be one of the following:
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<DL>
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<DT> <I>x_spacing</I> [<I>y_spacing</I> [<I>x_origin</I>
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<I>y_origin</I>]]
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<DD> set the grid to the indicated spacing, where all
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spacing and origin values are any valid <B>magic</B>
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<A HREF=distance.html><I>distance</I></A> value.
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<DT> <B>on</B>|<B>off</B>
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<DD> Set the visibility of the grid on or off, as indicated.
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<DT> <B>state</B>
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<DD> Report the state (on or off) of the grid. In the Tcl
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version, this is returned as a boolean value (0 or 1).
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<DT> <B>box</B>
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<DD> Report the box (rectangle) of the unit grid, in magic
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internal coordinates.
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<DT> <B>help</B>
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<DD> Print usage information on the <B>grid</B> command.
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</DL>
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</BLOCKQUOTE>
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</BLOCKQUOTE>
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<H3>Summary:</H3>
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<BLOCKQUOTE>
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The <B>grid</B> command has two purposes: to draw a reference grid
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on the screen as an aid to layout placement, and to define a snap
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grid of arbitrary (and not necessarily square) units. This second
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use works in conjunction with the <B>snap</B> command; with the
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invocation of <B>snap grid</B> (or, equivalently, <B>snap user</B>),
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standard magic dimensions for commands such as <B>move</B>, <B>copy</B>,
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<B>box</B>, <B>stretch</B>, and mouse-button movement of the cursor
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box are parsed as integer divisions of the user grid. The grid does
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not have to be visible ("<B>grid on</B>") for the snap function to be
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enabled. <P>
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Note that the grid has both spacing values and an offset; unlike the
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lambda grid, which is always aligned to the internal coordinate system,
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the user grid may be any value; for grid spacings that are not a
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multiple of internal or lambda values, the grid may need to be
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offset from the origin to get the desired alignment. To do this,
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specify the <I>x_origin</I> and <I>y_origin</I> values, which
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describe the offset of the grid origin from the internal coordinate
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system origin. <P>
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Usually there is no reason to have different <I>x_spacing</I> and
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<I>y_spacing</I> values (only one spacing value is required for
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both). However, occasionally it may be useful to define something
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like the following:
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<BLOCKQUOTE>
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<B>grid 150um 3l; snap grid</B>
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</BLOCKQUOTE>
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This example makes it easy to draw a number of horizontal routing
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lines aligned to a pad cell spacing of 150 microns. <P>
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Note that even when the grid is set to visible, at a large enough
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zoom factor, where the grid lines become dense, the grid will not
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be drawn. <P>
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<B>grid</B> with no arguments toggles the visibility of the grid
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lines on the screen.
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</BLOCKQUOTE>
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<H3>Implementation Notes:</H3>
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<BLOCKQUOTE>
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<B>grid</B> is implemented as a built-in window command in <B>magic</B>.
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</BLOCKQUOTE>
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<H3>See Also:</H3>
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<BLOCKQUOTE>
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<A HREF=snap.html><B>snap</B></A> <BR>
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</BLOCKQUOTE>
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<P><IMG SRC=graphics/line1.gif><P>
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<TABLE BORDER=0>
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<TR>
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<TD> <A HREF=commands.html>Return to command index</A>
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</TR>
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</TABLE>
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<P><I>Last updated:</I> November 7, 2004 at 3:24pm <P>
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</BODY>
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</HTML>
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