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<HTML>
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<title>Kernel APIs: CLEAR^XGF</title>
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<H3><A NAME="navskip">CLEAR^XGF</A>(): Screen Clear Region</H3>
<P><B>Reference Type:</B> Supported, <B>Category:</B> XGF Function Library,
<B>ICR#:</B> 3173</P>
<H4><A NAME="description">Description</A></H4>
<P>The CLEAR^XGF API clears a rectangular region of the screen. It is useful to
clear a portion of the screen.
<BR>
<BR>
The <strong>CLEAR</strong> function works by printing
spaces using the current screen attribute in the specified region. If the
screen attribute is changed and then the <strong>CLEAR</strong> function is used, the
rectangular region is cleared in the new attribute.
<BR>
<BR>
A call to the
<A HREF="prep-xgf.html"
TITLE="PREP^XGF API"
CLASS="bodylink">PREP^XGF(): Screen/Keyboard Setup API</A> <em>must</em> be made
at some point prior to calling CLEAR^XGF.</P>
<P>Acceptable values for the top
and bottom parameters range from <strong>0</strong> to <strong>IOSL-1</strong>.</P>
<P>Acceptable values for the left
and right parameters range from <strong>0</strong> to <strong>IOM-1</strong>.</P>
<H4><A NAME="format">Format</A></H4>
<PRE> CLEAR^XGF(top,left,bottom,right)</PRE>
<H4><A NAME="input_parameters">Input Parameters</A></H4>
<TABLE BORDER="1"
CELLPADDING="5"
BGCOLOR="#F1F2F3"
BORDERCOLORLIGHT="#F1F2F3"
BORDERCOLORDARK="#808080"
WIDTH="100%">
<TR>
<TD VALIGN="TOP"
WIDTH="15%">
<B>top:</B>
</TD>
<TD VALIGN="TOP"
WIDTH="85%">
<P>(required) Top screen coordinate for box.</P>
</TD>
</TR>
<TR>
<TD VALIGN="TOP">
<B>left:</B>
</TD>
<TD VALIGN="TOP">
<P>(required) Left screen coordinate for box.</P>
</TD>
</TR>
<TR>
<TD VALIGN="TOP"><B>bottom:</B>
</TD>
<TD VALIGN="TOP">
<P>(required) Bottom screen coordinate for box.</P>
</TD>
</TR>
<TR>
<TD VALIGN="TOP">
<B>right:</B>
</TD>
<TD VALIGN="TOP">
<P>(required) Right screen coordinate for box.</P>
</TD>
</TR>
</TABLE>
<H4><A NAME="output">Output Parameters</A></H4>
<TABLE BORDER="1"
CELLPADDING="5"
BGCOLOR="#F1F2F3"
BORDERCOLORLIGHT="#F1F2F3"
BORDERCOLORDARK="#808080"
WIDTH="100%">
<TR>
<TD VALIGN="TOP"
WIDTH="15%">
<B>$x and $y:</B>
</TD>
<TD VALIGN="TOP"
WIDTH="85%">
<P>Set to the right and bottom specified as parameters.</P>
</TD>
</TR>
</TABLE>
<P><strong>NOTE:</strong> See also:
<A HREF="restore-xgf.html"
TITLE="RESTORE^XGF API"
CLASS="bodylink">RESTORE^XGF(): Screen Restore</A>,
<A HREF="save-xgf.html"
TITLE="SAVE^XGF API"
CLASS="bodylink">SAVE^XGF(): Screen Save</A>, and
<A HREF="win-xgf.html"
TITLE="WIN^XGF API"
CLASS="bodylink">WIN^XGF(): Screen Text Window</A> APIs.</P>
<H4>Examples</H4>
<H4><A NAME="example">Example 1</A></H4>
<P>For example, to clear the entire screen, do the following:</P>
<table width="100%"
border="1"
cellspacing="3"
cellpadding="3">
<tr>
<td>
<PRE>><B>D CLEAR^XGF(0,0,23,79)</B></PRE>
</td>
</tr>
</table>
<H4>Example 2</H4>
<P>To clear a rectangular region in the center of the screen, do the following:</P>
<table width="100%"
border="1"
cellspacing="3"
cellpadding="3">
<tr>
<td>
<PRE>><B>D CLEAR^XGF(5,20,15,60)</B></PRE>
</td>
</tr>
</table>
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