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<TITLE>IBM Visualization Data Explorer Programmer's Reference</TITLE>
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<H1>IBM Visualization Data Explorer Programmer's Reference</H1>
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<H3><A NAME="HDRDXGSI" HREF="progu097.htm#PToC_294">DXGetScreenInfo</A></H3>
<A NAME="IDX1792"></A>
<A NAME="IDX1793"></A>
<P><STRONG>Function</STRONG>
<P>
Returns information about a Screen Object.
<P><STRONG>Syntax</STRONG>
<BR>
<TT><STRONG><BR>
#include <dx/dx.h><BR>
<P><BR>
Screen DXGetScreenInfo(Screen s, Object *o, int *position, int *z)<BR>
</STRONG></TT><BR>
<P><STRONG>Functional Details</STRONG>
<P>
Returns the Object being transformed and the screen transformation
parameters from Screen Object <TT><STRONG>s</STRONG></TT>. If
<TT><STRONG>o</STRONG></TT>
is not <TT><STRONG>NULL</STRONG></TT>, then the Object being transformed
by the screen transformation is returned in
<TT><STRONG>o</STRONG></TT>. Similarly, if
position is not <TT><STRONG>NULL</STRONG></TT>, then the
type of screen transformation
is returned in <TT><STRONG>position</STRONG></TT>. Finally, if
<TT><STRONG>z</STRONG></TT>
is not <TT><STRONG>NULL</STRONG></TT>,
the depth of the Screen Object is returned in
<TT><STRONG>z</STRONG></TT>.
<P>
The value returned in <TT><STRONG>position</STRONG></TT> will be one of the
following:
<UL COMPACT>
<LI><TT><STRONG>SCREEN_VIEWPORT</STRONG></TT>--The origin of
<TT><STRONG>o</STRONG></TT> is
in viewport-relative coordinates. <TT><STRONG>o</STRONG></TT>
will be centered in the viewport when displayed.
<LI><TT><STRONG>SCREEN_PIXEL</STRONG></TT>--The origin of
<TT><STRONG>o</STRONG></TT> is in pixel
coordinates. <TT><STRONG>o</STRONG></TT>
will be centered about the specified pixel
coordinate when displayed.
<LI><TT><STRONG>SCREEN_WORLD</STRONG></TT>--The origin of
<TT><STRONG>o</STRONG></TT> is in
world coordinates. <TT><STRONG>o</STRONG></TT> will
be located in the world coordinate system.
<LI><TT><STRONG>SCREEN_STATIONARY</STRONG></TT>--<TT><STRONG>o</STRONG></TT> is
parallel to the screen, but in its own
coordinate system.
</UL>
<P>
When position is <TT><STRONG>SCREEN_STATIONARY</STRONG></TT>, then
<TT><STRONG>z</STRONG></TT> will take one of the following values:
<TABLE CELLPADDING="3">
<TR VALIGN="TOP"><TD><P><TT><STRONG>< 0</STRONG></TT>
</TD><TD><P>Object <TT><STRONG>o</STRONG></TT> is to be displayed behind the
other
Objects in the scene.
</TD></TR><TR VALIGN="TOP"><TD><P><TT><STRONG> 0</STRONG></TT>
</TD><TD><P>Object <TT><STRONG>o</STRONG></TT> is to be displayed in the middle
of
the scene.
</TD></TR><TR VALIGN="TOP"><TD><P><TT><STRONG>> 0</STRONG></TT>
</TD><TD><P>Object <TT><STRONG>o</STRONG></TT> is to be displayed in front of
the
other Objects in the scene.
</TD></TR></TABLE>
<P><STRONG>Return Value</STRONG>
<P>
Returns <TT><STRONG>s</STRONG></TT> or returns <TT><STRONG>NULL</STRONG></TT>
and sets an error code if <TT><STRONG>s</STRONG></TT> is not
a Screen Object.
<P><STRONG>See Also</STRONG>
<P>
<TT><STRONG>
<A HREF="progu260.htm#HDRDXNSN">DXNewScreen</A>,
<A HREF="progu325.htm#HDRDXSSO">DXSetScreenObject</A>
</STRONG></TT>
<P>
<A HREF="progu079.htm#HDRSNCS">16.5 , "Screen Class"</A>.
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